Factors affecting the power factor of permanent magnet motors

<p>Because each manufacturer uses a permanent magnet high-voltage motor in a different environment, sometimes the power factor needs to be lower under no-load conditions, but this consumes a lot of energy, so generally no-load operation should be avoided. When the load is running, you need to increase the motor power factor.</p><p><br></p><p>Factors affecting the power factor of permanent magnet high voltage motor:</p><p>&nbsp;&nbsp;Voltage quality (voltage amplitude) and load rate. When the grid voltage is higher than the back EMF point of the motor, the <a href="https://www.pm-motor.com/products" rel="noopener noreferrer" target="_blank"><strong><a href="https://www.pm-motor.com/products" target="_blank">permanent magnet motor</a></strong></a> operates with an inductive load; the motor operates with a capacitive load. Therefore, the fluctuation of the grid voltage will cause the fluctuation of the power factor of the motor. If the voltage amplitude is close to the motor back EMF point and the deviation is within ±2% of the voltage range, the motor power factor is greater than or equal to 0.9, the power factor is lower; in addition, when the load rate of the permanent magnet motor is less than 25% , The motor power factor is also low.</p><p><br></p><p>How to improve the motor power factor</p><p>&nbsp;&nbsp;1. Replace the permanent magnet high-voltage motor appropriately according to the measured load rate to ensure that the appropriate load rate is achieved.</p><p>&nbsp;&nbsp;3. Stabilize the single-well voltage to be close to the no-load back EMF of the permanent magnet high-voltage motor.</p><p>&nbsp;&nbsp;4. When the operating voltage is higher than the back-EMF point of the<a href="https://www.pm-motor.com/products" rel="noopener noreferrer" target="_blank"> permanent magnet motor</a>, capacitance compensation can be added according to the magnitude of the inductive reactive power to improve the power factor of the motor.</p><p>&nbsp;&nbsp;5. When the operating voltage is lower than the back-EMF point of the motor, adjust the transformer tap-changer to properly increase the amplitude of the secondary voltage, so that the operating voltage of the motor is near the back-EMF point, thereby improving its power factor.</p><p>&nbsp;&nbsp;6. For heavy-duty long lines, after adjusting the transformer tap changer, when the secondary voltage amplitude of the transformer is still lower than the back-EMF point of the <a href="https://www.pm-motor.com/products" rel="noopener noreferrer" target="_blank">permanent magnet motor</a>, the permanent magnet high-voltage motor can be replaced, and the capacitor is used for compensation. </p><p>&nbsp;&nbsp;Using the correct method to improve the power factor of the permanent magnet high voltage motor can reduce the loss of the circuit and improve the safety of electricity. The corresponding manufacturers can also reduce the cost of electricity and reduce the cost, so the factory price of the motor is more favorable.</p>