Ferrite magnets and the application of the main raw material

May 29th, 2011

Ferrite Pot Magnets Supplier and the main raw material, including BaFe12O19 SrFe12O19. Made of ceramic technology by law, rather hard texture, is a brittle material, the ferrite magnets have good temperature resistance, low cost, moderate performance, has become the most widely used permanent magnets.

Type of magnetic materials

Ferrite is a ferromagnetic metal oxide. On the electrical properties, the ferrite resistivity than metals, magnetic alloy is much greater, but also a high dielectric properties. The magnetic properties of ferrite is also reflected in the high frequencies with high permeability. Thus, the ferrite has become a widely used high-frequency weak areas of non-metallic magnetic materials.

Mixture of ferrite is formed by a variety of sintered iron oxide magnetic metal oxides, the main raw materials, iron oxide, barium carbonate or strontium carbonate.

Since ferrite magnetic energy stored per unit volume low, and lower saturation magnetization (usually only the iron of 1 / 3 to 1 / 5), which limits its high energy density in the required low-frequency electric and High-power fields.

Ferrite magnets are widely used in automotive motor (windshield wiper, start, heater, fuel pump, and seat motors), magnetic exercise bike and massage chairs. Samarium cobalt, aluminum, nickel and cobalt is mainly used in instruments, motors and some of the work environment there are special requirements of mechanical equipment. It can be said, ferrite magnets have become indispensable for the electronics industry one of the basic materials.

Tags: , , ,
Posted in Uncategorized | 5 Comments »

Common causes of stator winding faults

May 27th, 2011

Common causes of stator winding faults:
Common Motor Stator Winding insulation resistance failure has reduced, turn to turn short circuit, open circuit, grounding (ground breakdown), and reverse polarity winding connection and so on.
1. field winding insulation resistance reduction reasons:
A dirt or toner surface insulation
B insulation damp
C insulation aging.
2. Excitation Winding reasons
A dusty surface of the coil insulation and oil, so that inter-turn short circuit.
B manufacture or repair rewind coil transition have S bends turns required to strengthen the pad into the insulated, as mishandling the transition at the S bend or break the insulation and damage squeezed, resulting in the S bend at the inter-turn short circuit.
C transition at the end of the first turn to strengthen the insulation, the end result is the first full voltage, the voltage is relatively high, not strengthened or reinforced insulation is not enough, will be adjacent to the line in the first turn at the end of the short circuit. This failure often encountered in the repair of the DC machine.
D handling or testing process, the field winding subjected to mechanical damage.
3. field winding ground
A coil on the core of the main insulation into conductive dust, grease, dirt into the cracks in the insulation, so that the coil-to-ground breakdown, causing the coil to ground.
B coil on the core loose (due to contraction of the insulation aging, old varnish or insulation adhesive is not strong due to), subject to wear and tear on the insulation, coil-to-ground breakdown eventually occurs.
C winding damp, insulation resistance is very low, in the over-voltage effects, the occurrence of coil-to-ground breakdown.
4. winding circuit and reverse reasons:
A field winding circuit. Available 220V insulation resistance test lamp or table to check, can also be used multimeter check. Occurred in the welding circuit point lead at the point and, more easy to find. Winding circuit as unreasonable, there is no excitation current, the motor can not start. The compound Motor Stator, when the shunt winding circuit, the power series excited winding only, pay attention to produce coaster accident.
B field winding reversed. Starter motor problems, reduced torque, can not even start.

Tags:
Posted in Uncategorized | 106 Comments »

Commonly used two-speed fan motor stator winding connection types of discussions

May 26th, 2011

1 of the problem

Often building electrical design for power distribution for the two-speed fan, control design, in the process that fans old and new models of the electrical parameters are significantly different, especially when the two types of high-power low-speed running is very different, see Table 1.

Two kinds of two-speed fan motor stator winding selected is different from the corresponding power is also different, especially in low speed power varied. Double pole change speed motor is speed, by setting two separate windings, the motor stator winding connection or through the transformation to obtain two different speeds, which can be reversed Pole, commutated pole. YD-type motor execution (YD series (IP 44) multi-speed three-phase induction motors “(JB / T 7127-1993, frame size 80 280) standards, the winding connection type for the △, YY; YDT motors Executive (YDT series (IP4) multi-speed three-phase induction motors “(JB / T 8681-1998, frame size 80 ~ 315), the winding connection type for the Y / Y, Y / YY, 3 Y + Y/3Y other. YDT corresponding fan motors, pump motors class load more energy than the YD, the industry has a lot of discussion. this paper, for fire ventilation (Dual) low noise centrifugal fan commonly used in tank 6 / 4 pole transformation discussed .

2 YD motors △ / YY-type connection

2. 1 YD a 6 / 4 motor parameters

Two-speed fan according to the sample data, the YD-type motors are usually selected for the 6 / 4 pole change, according to JB / T 7127-1993 above, the stator winding transform type is △ / YY. Extract of the motor parameters used in Table 2.

2.2 YD a 6 / 4 motor wiring

YD a 6 / 4 stator winding connection is shown in Figure 1, the motor shown in Figure 2, the external terminals, the main circuit connection shown in Figure 3.

2.3 YD a 6 / 4 motor components of the selected main circuit power distribution

When △ connection speed, QF, KM, KH and wire cross section by. Selected. YY when high-speed connection, QF, KM:, KH, and wire cross-section by, ^ selected, KM Press, / 2 selection. By △ / YY transformation is approximately constant power conversion, high power at low speeds very close to, the conductor cross-section are basically the same. Table 2 sets out the common types of such motor efficiency, power factor and the corresponding current value, the design can be directly controlled by the current value of the selected components and wires

3 YDT motors Y / Y and 3 Y + Y/3Y type of wiring

3.1 YDT a 6 / 4 motor parameters

Two-speed fan according to the sample data, the choice of YDT-type motor is 6 / 4 pole change, according to JB / T 8681-1998 above, the stator windings transform type is Y / Y. Extract of the motor parameters used in Table 3.

3.2 YDT a 6 / 4 motor wiring

3.2.1 Y, Y connection

YDT a 6,4-type stator winding Y / Y connection for the two-winding connection, shown in Figure 4. Motor external terminals shown in Figure 5. Main circuit wiring diagram shown in Figure 6.

3.2.2 3 Y + Y/3Y connection

YDT a 6 / 4 stator windings 3 Y + Y/3Y connection as a single winding connection, the use of commutated pole, shown in Figure 7. Motor external terminals shown in Figure 8. Main circuit wiring diagram shown in Figure 6.

3.3 YDT a 6 / 4 motor components of the selected main circuit power distribution

Low speed for 6 pole winding, QF, KM, KH and wire cross-section by, selection. High speed 4 pole winding, QF, KM, KH and wire cross-section by, selection. Table 3 sets out the common types of such motor efficiency, power factor and the corresponding current value, the design can be directly selected by the current value of the components and wires.

3.4 YDT an 8 / 6 motor

Two-speed fan according to the sample data, in the two-speed axial flow fan, the state has selected 8 / 6 poles transform two-speed motor. For example, HTF-IV-N0l2, speed 960/720 r / rain, power 15/30 kW. Corresponds to a motor YDT 225M 8 / 6. The same type of motor stator winding transform YDT a 6 / 4 motor transformation.

4 YDT motors Y / YY-type connection

4.1 YDT a 4 / 2 motor parameters

Two-speed exhaust fan according to the sample data, in the two-speed axial exhaust fan, there are optional 4 / 2 pole transform two-speed motor. For example, HTF-II-No 5.5, speed 1 450 / 2 900r/min, Power 0.8/3.1 kW, corresponding to motor YDTlOOL2-4 / 2 type.

4.2 YDT a 4 / 2 motor connection

YDT-4 / 2 stator winding connection for the single-winding Y / YY transformation, shown in Figure 9. Motor external terminals shown in Figure 1O. Main circuit wiring diagram with Figure 3.

4.3 YDT a 4 / 2 motor components of the selected main circuit power distribution

Low speed connection for the Y, QF. , KM. , KH press to select. YY when high-speed connection, QV,, KM,, KH, press, ^ selected, KM3 by / 2 selection. Figure 9 shows the same time, high speed wire cross-section by, select, and not by low-speed wire, 1 but should be by, / 2 selection.

5 Conclusion

In summary, the power distribution during the two-speed fan design, should be made according to the ventilation fan model professional, to identify the corresponding two-speed motor type, clear its stator winding connection type, and in accordance with the appropriate design of the electrical parameters . Can be seen from the above, △ / YY and the Y / YY main circuit wiring is the same, but with its high-speed wires are not the same as the selection section; and Y / Y and 3 Y + Y/3Y not the main circuit KM contactor needs. Suggested that the relevant departments as soon as possible with the new dual-speed electric fan to match the standard atlas for the design selection.

Given the limited capacity of the author, the above view and fan manufacturers in the process of verification has not been a positive response, so she proposed this article, the industry experts who criticized the correction. Greatest of pleasure.

Tags:
Posted in Uncategorized | 5 Comments »

Permanent magnet synchronous motor and induction motor and characteristics’s differences

May 25th, 2011

Permanent magnet synchronous Motor Rotor and induction Motor Rotor and characteristics of the main differences
Relies on the induction Motor Rotor stator rotor excitation current, and permanent magnet Motor Rotors rotor is permanent magnet produces a magnetic field does not require direct electrical excitation. Therefore, permanent magnet synchronous Motor Rotor has a simple structure, reliable operation, small size, light weight, high efficiency, flexible shapes and sizes and so on.

Tags:
Posted in China Supplier Information, Uncategorized | 151 Comments »

Rare earth permanent magnet motor without the promotion of core

May 24th, 2011

Rare-earth permanent magnet Magnets Assembled with Steel Parts coreless motor is a new product, the market is in a foster among the application still faced with many difficulties. First, social awareness is not high. Most users do not understand the technology about Magnets Assembled with Steel Parts, the product works, apply effects, reliability is also skeptical. Second, the standards behind.
In terms of the standard permanent magnet motor is very scarce, rare earth permanent magnet coreless motor area is blank, seriously affecting the motor of the type of product selection, performance evaluation, quality testing, promote the use of restricted products. Third, the degree of industrialization to be improved. Currently, low-power rare-earth permanent magnet coreless motor in volume production in small-scale wind power generation, diesel power generation, power tools have been widely used. However, the high-power motor is still in the demonstration phase. Fourth, the lack of policy incentives. Energy efficient motors with Magnets Assembled with Steel Parts initial high cost of information asymmetry and other market barriers need to leveraging the state has adopted market-related incentives, training industry.

Tags:
Posted in China Supplier Information, Uncategorized | 81 Comments »

Three-phase asynchronous motor stator windings to determine the correctness of connections

May 24th, 2011

The more common three-phase asynchronous motor is a single winding motor and two forms of double-winding motor, three-phase asynchronous motor stator winding distribution according to certain rules in the stator core, and each phase, from beginning to end, according to a certain law of three-phase winding inclusive Connected to form a Y or Δ connection. If the beginning and end of their connection is not correct, when access to three-phase alternating current, not only because they can not produce a rotating magnetic field which led to not run properly, it will lead to winding fever, or burning motor. Therefore, the new motor and put into operation or after winding the motor re-winding, the polarity of the stator must be checked to ensure the accuracy of their connection. National Standard GB50150-2006 “works of electrical installations of electrical equipment over test” section 6.0.11 provides that “check the polarity of the stator windings and their connections should be correct. neutral who do not check the polarity was not elicited. ” How to check the neutral point leads to it? Not elicited by the neutral point can not check it? Electrical test access to the relevant books, some books on the neutral point leads only describes the polarity of the motor stator winding and the connection test the correctness of authentication methods, but mostly wrong. For the neutral point does not lead to the winding, there is no book describes the testing and validation methods. In this paper, the practice of practical work, to three-phase asynchronous motor stator winding connection method to judge the correctness of conduct of the trial.

Tags:
Posted in China Supplier Information, Uncategorized | 126 Comments »

Gree motor with a new generation of fans to push heat protection recoverable

May 23rd, 2011

The hot summer coming, the fan has become one of the summer heat of the hot products. Fans currently on the market in technology, functional areas where there are many other tricks, negative ions, ultra-quiet, double blades, five blades, and other functions photocatalyst endless, dazzling. Gree small appliances, according to the person in charge of Guangzhou region, fans of the structure is relatively simple, which the most critical and most easily damaged but also the most valuable thing is the motor. The core component of the fan motor is good the fan motor can stimulate more powerful fan, and long-term operation without damage, and poor motor will be used slightly longer heating time, it is easy to burn. The fan motor is the basis of quality, the motor is good, the overall operation of the fan is more quiet, more comfortable hair and longer life. So, first look is to buy the fan motor. Good fan motor, shell timber is good, solid and stable, the stator magnetic guide is good, the rotor is stable. Reflected in the fan is running, that is quiet, smooth, noise, hand on the machine head, do not feel significant vibration. And because the motor foot timber, the fan will be more emphasis on the overall weight, size good product weight than inferior products 30% to 50%.

According to him, Gree now introduced a whole new generation to the Motor Lamination motor. It is a special case steel imported from Japan, the stator magnetic properties of a good selection of silicon steel, electrical structural stability, running strong. Its biggest advantage is the use of the ball, as compared with ordinary oil-bearing motors, significantly reducing friction. Therefore, quieter operation, energy saving, more powerful, life expectancy of up to 25,000 hours. To prevent overheating the Motor Lamination, Gree ball bearing motor housing before and after the six cooling holes designed to facilitate faster distribution of heat. At the same time restore the motor with thermal protection Bennett, under special circumstances when the internal temperature of the Motor Lamination, thermal protection automatically cut off power supply, and can automatically resume after the temperature returned to normal power, and normal motor power to professional service after the point to recovery.

Tags:
Posted in Uncategorized | 147 Comments »

A typical industrial motor and pump and valve of the key energy-saving technologies

May 23rd, 2011

 Recently, the Hefei Chemical Equipment Hawk and other units of energy engineering company, shared the “Eleventh Five-Year” National Technology Support Program “and the typical Motor Rotors valve key energy-saving technology” key project “energy efficient industrial technology development and application of energy-saving valve “project in Hefei, Anhui passed inspection.

    Issues for the petrochemical pumps, steam system condensate recovery unit and other typical products, energy-saving technology development and application of hydraulic model to carry out an efficient, optimal design of the overall structure of key technologies such as energy research, development of the Motor Rotors, mixed flow, tubular pump efficiency not overload the hydraulic model to address the key manufacturing process of the pump, wear-resistant materials, formulations and sealing technology; the capture of the steam trap condensate recovery key technologies of energy saving, development of oil refining equipment bottom pumps, power station desulphurization pumps, large-scale penetration Pump efficiency than similar domestic products on average increased by 5% or more; highly efficient steam system condensate recovery trap, the condensate can be achieved rate was 95%. Energy-saving products have been developed in the petrochemical, coal chemical industry, power plants, the successful application areas of the South East.

    The study to improve the thermal efficiency of Motor Rotors, steam pipe network system in China to promote energy-saving products and technologies to promote and update and increase the recycling of heat energy have a positive effect.

Tags:
Posted in Uncategorized | 71 Comments »

Magnets Electricity and Magnetic Motors – Build Your Own and Create Electricity With Magnets

April 29th, 2011
Tesla – Magnets, Electricity and Electromagnetism
For hundreds of years, inventors the world over have sought out the secrets to producing free energy. Nikola Tesla was arguably the best known inventor and scientist revolutionizing research in the area of electromagnetism.
Motor Magnets = Electricity = Electromagnetism
As you are probably aware, it is possible for the do it yourselfer to create their own over unity (produces more power than it consumes) magnetic motor to supplement or even
replace your current dependence on the power company. Whether you want to be totally “off grid” or just reduce your electric bills, you can do it with an electromagnetic over unity motor.
Basic Science of Magnets – Electricity
The basic science behind Motor Magnets, electricity and perpetual motion over unity magnetic motors is in the natural repel and attraction of magnets. These forces create a rotational movement when these are aligned just right in the motor. These Motor Magnets used in conjunction with easily available hardware available from your local hardware, auto supply and home improvement store are assembled to create the magnetic motor equals free energy or zero point energy as sometimes called.
Magnetic Motor For Home Energy
This simple to understand technology at one time was a myth for producing home energy. If it were up to the oil companies and big business, it would still be a myth. If you’ve found this page, then you have done a search on the Internet. It is not a myth, and the more that “we the people embrace” these alternative energy technologies, the bigger the message that we can send to the oil companies and big business.
Is It Easy To Build?
Magnets, electricity and magnetic motors are actually a far simpler project than building a solar panel or even a wind generator. Magnets, electricity and a magnetic motor also has the advantage that it does not rely on the wind or the sun to shine to produce electricity for you. It is a perpetual motion machine (never stops), although, you may have to replace them in your generator once about every 400 years. This device will work in every home and you only need a small space allocated to place the motor into. The materials that are needed to produce a motor are cheap and inexpensive and generally available locally.
The Future Of Magnets, Electricity and Magnetic Motors
Assembling and construction of one of these motors can fully power your home, depending on the size unit that you decide to build. Solar panels and wind power are also good energy alternatives, but honestly don’t compare when it comes to cost and functionality of a well built magnet motor that you can easily build yourself with the right set of step by step plans. If you’re ready to start taking control of your future and your finances, click one of the links below and get busy building your own free energy producing magnetic motor….Magnets, electricity and magnetic motors…
Article Source: http://EzineArticles.com/2848862

Tags:
Posted in Motor Parts Information | 109 Comments »

AC Motor – Basics of AC Motor Design Engineering

April 13th, 2011
A synchronous and synchronous electric motors are the two main categories of ac motors. The induction ac motor is a common form of asynchronous motor and is basically an ac transformer with a rotating secondary. The primary winding (stator) is connected to the power source and the shorted secondary (Motor Rotors) carries the induced secondary current. Torque is produced by the action of the Motor Rotors (secondary) currents on the air-gap flux. The synchronous motor differs greatly in design and operational characteristics, and is considered a separate class of ac motor.
Induction AC Motors: Induction ac motors are the simplest and most rugged electric motor and consists of two basic electrical assemblies: the wound stator and the rotor assembly. The induction ac motor derives its name from currents flowing in the secondary member (rotor) that are induced by alternating currents flowing in the primary member (Motor Stator Winding). The combined electromagnetic effects of the stator and rotor currents produce the force to create rotation.
AC motors typically feature rotors, which consist of a laminated, cylindrical iron core with slots for receiving the conductors. The most common type of rotor has cast-aluminum conductors and short-circuiting end rings. This ac motor “squirrel cage” rotates when the moving magnetic field induces a current in the shorted conductors. The speed at which the ac motor magnetic field rotates is the synchronous speed of the ac motor and is determined by the number of poles in the stator and the frequency of the power supply: ns = 120f/p, where ns = synchronous speed,    f = frequency, and     p = the number of poles.
Synchronous speed is the absolute upper limit of ac motor speed. If the ac motor’s rotor turns exactly as fast as the rotating magnetic field, then no lines of force are cut by the rotor conductors, and torque is zero. When ac motors are running, the rotor always rotates slower than the magnetic field. The ac motor’s rotor speed is just slow enough to cause the proper amount of rotor current to flow, so that the resulting torque is sufficient to overcome windage and friction losses, and drive the load. The speed difference between the ac motor’s rotor and magnetic field, called slip, is normally referred to as a percentage of synchronous speed: s = 100 (ns – na)/ns, where s = slip, ns = synchronous speed, and na = actual speed.
Traxxas 3353 Rotor Velineon 3500 Motor
This is the Rotor for the Traxxas Velineon 3500 Brushless Motor, TRAC3351. FEATURES: Precision-balanced replacement rotor INCLUDES: Rotor for the Traxxas Velineon 3500 Brushless Motor REQUIRES: Disassembly of motor jxs 1/25/08 ir/jxs
astle Creations 1515-2200kV Rotor Replacement Kit CSE011-0012-00
This is the Castle 1514-2200KV Motor Repair Kit for the Neu Castle 1515-2200kv Motor.

Tags: ,
Posted in Motor Parts Information | 64 Comments »

« Older Entries