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Zhuji Electric Technology Co., Ltd.
Contact: Manager Liu
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Add: No. 15th, Zhuji Road, Zhuji, Shaoxing, Zhejiang Province, Shaoxing, Zhejiang Province

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Characteristics of rare earth Permanent magnet synchronous motor and power saving principle
Edit:Zhuji Electric Technology Co., Ltd.   PublicDate:2019-01-26

 Rare Earth Permanent magnet synchronous motor, The starting power moment and overload capacity are higher than three-phase asynchronous motor is a power grade, the maximum starting power moment and the rated torque ratio can be up to 3.6 times times, while the general asynchronous motor is only 1.6 times times.

1, Rare earth Permanent magnet synchronous motor no slip difference, rotor without Kipotie, copper consumption.

2, Rare earth Permanent magnet synchronous motor for bilateral excitation, and mainly rotor permanent magnet excitation, its power factor can reach or close to 1.0.

3, the improvement of power factor, on the one hand to save reactive power, on the other hand, also make stator current decline, stator copper consumption reduction, efficiency improvement.

The polar arc coefficient of rare earth permanent magnet synchronous motor is generally larger than the polar arc coefficient of asynchronous motor, when the power supply voltage and stator structure are certain, the average magnetic induction strength of rare earth permanent magnet synchronous motor is smaller than that of asynchronous machine and the iron loss is small.

4. As for the stray loss of rare earth Permanent magnet synchronous motor, it is generally believed that the dispersion loss is increased due to the non-sinusoidal nature of its permanent magnet magnetic field, but on the other hand, the large air gap of rare earth permanent magnet motor reduces the stray loss.

5, Rare earth Permanent magnet synchronous motor constant loss (iron consumption + mechanical loss) Small, variable loss (stator copper consumption) changes than the asynchronous motor variable loss (stator copper consumption + rotor copper consumption) changes slowly, so that its efficiency characteristics have a high and flat characteristics, so that rare earth permanent magnet motor in the light load of a fairly wide area of the maximum efficiency. If used on an oilfield oil recovery machine, this area coincides with the area of the average load of the oilfield oil recovery machine. For this reason, the rated efficiency of rare earth Permanent magnet synchronous motor is 4%-7% higher than that of asynchronous motor, but the average efficiency in the whole range of load change, rare earth Permanent magnet synchronous motor can be 12% higher than three-phase asynchronous motor.

6, the use of rare earth Permanent magnet synchronous motor, reactive power-saving rate of up to 85%, active electricity energy saving rate up to 23%-25%, energy-saving effect is very obvious.

Power Saving principle:

Rare Earth Permanent magnet synchronous motor (rare earth motor) adopts rare earth permanent magnet material, has the self-starting ability, effectively reduces the active and reactive power loss when the motor machine is running, so as to obtain high efficiency and power factor at the same time, it has good starting performance and high traction synchronous torque. Compared with the YA series motor, the power saving rate can reach more than 12%, which is an alternative product for energy-saving transformation of asynchronous rat cage motor. Its mounting size and structure form are consistent with the same model as the same capacity Y series motor, to directly replace the non-frequent start and long-term operation of the Y-series motor.

Rare earth motor selected high conductivity magnetic and high conductive materials, embedded in the rotor rat cage by NdFeB Rare earth materials composed of permanent magnet magnetic steel, in the motor starting, relying on the rotor mouse cage Permanent magnet magnetic steel and stator rotating magnetic field interaction, from the asynchronous pull into the synchronous operation, so that the rotor speed and stator rotating magnetic field synchronization speed is consistent, There is no difference in rotational speed, thus eliminating the copper and iron loss of the rotor; In addition, because the rotor of rare earth motor is excited by magnetic steel, the excitation current of stator winding decreases and the loss of no-load is reduced, so the total loss of rare earth motor is lower than that of asynchronous motor, and the efficiency and power factor are improved.