Dalan Motor today will focus on five aspects of the efficiency and temperature rise of three-phase asynchronous motors, insulation strength problems, harmonic electromagnetic noise and vibration, the motor's ability to start frequently, braking adaptability, and cooling problems at low speeds. To discuss the impact of the inverter on the motor.
1. The problem of motor efficiency and temperature rise
Regardless of the type of frequency converter, harmonic voltages and currents of varying degrees are generated during operation, allowing the motor to operate under non-sinusoidal voltages and currents. Higher harmonics will cause the increase of the motor stator copper consumption, rotor copper (aluminum) consumption, iron consumption and additional losses, the most significant is the rotor copper (aluminum) consumption.
Second, the problem of motor insulation strength
At present, many small and medium frequency converters use PWM control mode. His carrier frequency is about several thousand to more than ten kilohertz, which makes the stator winding of the motor to withstand a very high voltage rise rate, which is equivalent to applying a steep shock voltage to the motor, making the interturn insulation of the motor more resistant A harsh test.
3. Harmonic electromagnetic noise and vibration
When the asynchronous motor is powered by the inverter, the vibration and noise caused by electromagnetic, mechanical, ventilation and other factors will become more complicated. When the frequency of the electromagnetic force wave is the same as or close to the natural vibration frequency of the motor body, resonance will occur, thereby increasing noise.
4. The adaptability of the motor to frequent starting and braking
After the inverter is used for power supply, the motor can be started at a very low frequency and voltage without inrush current, and the various braking methods provided by the inverter can be used for rapid braking, so the mechanical system and electromagnetic of the motor The system is under the action of cyclic alternating force, which brings fatigue and accelerated aging problems to the mechanical structure and insulation structure.
Fifth, the cooling problem at low speed
First, the impedance of the asynchronous motor is not ideal. When the frequency of the power supply is low, the loss caused by the higher harmonics in the power supply is large. Secondly, when the speed of the ordinary asynchronous motor is reduced again, the cooling air volume is reduced in proportion to the cube of the speed, which causes the low-speed cooling condition of the motor to deteriorate, the temperature rise increases sharply, and it is difficult to achieve constant torque output.
----- Responsible Editor: Dalan Oil Pump Motor 02-Procurement Consultant
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