The presentation of inverters has brought a revolution to industrial automation control and motor energy saving. Industrial production is simply inseparable from the inverter, even in the daily livelihood, elevators, inverter air conditioning has become a part of the insistence, inverter from the beginning into all corners of production, subsistence. However, the inverter also brings a lot of unprecedented disturbances, in which the destruction of the motor is one of the most typical phenomena.
Many people have noticed the phenomenon of inverter damage to the motor in the past. For example, in the past two years, his users have repeatedly reported that the pump is damaged during the warranty period. In the past, the quality of this pump plant was very reliable. Checking the interviews from beginning to end, it was found that the damaged pumps were all driven by frequency converters.
Although the phenomenon of inverter damage to the motor is becoming more and more concerned, the mechanism of this phenomenon is not yet clear, and people do not know how to avoid it. The goal of this article is to deal with these bewilderments.
Damage to the motor by the inverter
The damage of the inverter to the motor includes two aspects, the damage of the stator winding and the damage of the bearing. This kind of damage generally occurs within a few weeks to more than ten months, and the specific time is related to the brand of the inverter, the brand of the motor, the power of the motor, the carrier frequency of the inverter, the length of the cable between the inverter and the motor, the temperature, and many other factors. The unexpected damage of the motor in the late stage brings huge economic losses to the output of the enterprise. This loss is not only the cost of motor maintenance and conversion, but also the economic loss caused by unexpected shutdown. Therefore, when using the inverter to drive the motor, it is necessary to pay attention to the problem of motor damage.
Damage to the motor by the inverter
The difference between inverter drive and power frequency drive
To understand the mechanism that the power frequency motor is more likely to be damaged under the premise of the inverter drive, the first thing to understand is the difference between the voltage of the inverter drive motor and the power frequency voltage. Then realize how this difference has an adverse effect on the motor.
The basic mechanism of the inverter consists of two parts: rectifier and inverter. The rectifier is the DC voltage output electricity composed of a popular diode and a filter capacitor, and the inverter converts the DC voltage into a pulse-width modulated voltage waveform (PWM voltage). Therefore, the voltage waveform of the inverter-driven motor is a pulse waveform with a change in pulse width, not a sine wave voltage waveform. Driving the motor with an impulse voltage is the basic cause of the motor being easily damaged.
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