Although the phenomenon that the inverter damages the wound-wound asynchronous motor is getting more and more attention, the mechanism for causing this phenomenon is still unclear, and it is not known how to prevent it. The purpose of Dalan Motor Xiaobian is to help you solve these confusions.
Inverter damage to the motor:
Damage to the motor by the frequency converter includes two aspects, damage to the stator windings and damage to the bearings. This kind of damage generally occurs in a few weeks to ten months, the specific time and the brand of the inverter, the brand of the motor, the power of the motor, the carrier frequency of the inverter, the cable length between the inverter and the motor, the ambient temperature, etc. Many factors are related. The early accidental damage of the motor brings huge economic losses to the production of the enterprise. Not only the cost of motor repair and replacement, but also the economic loss caused by accidental shutdown.
The difference between inverter drive and power frequency drive:
To understand the mechanism that the power frequency motor is more susceptible to damage under the driving conditions of the inverter, first understand the difference between the voltage of the inverter drive motor and the power frequency voltage. Then understand how this difference has a negative impact on the motor.
The basic structure of the inverter includes two parts: a rectifier circuit and an inverter circuit. The rectifier circuit is a DC voltage output circuit composed of a common diode and a filter capacitor, and the inverter circuit converts the DC voltage into a pulse width modulated voltage waveform (PWM voltage). Therefore, the voltage waveform of the inverter drive motor is a pulse waveform with a pulse width change instead of a sine wave voltage waveform. Driving the motor with a pulsed voltage is the root cause of the motor's easy damage.
The mechanism of the inverter damage the stator winding of the motor:
When the pulse voltage is transmitted over the cable, if the impedance of the cable does not match the impedance of the load, reflections will occur at the load end. As a result of the reflection, the incident wave and the reflected wave are superimposed to form a higher voltage, and its amplitude can reach twice the DC bus voltage, which is equivalent to about three times the input voltage of the inverter, as shown in FIG. Excessive spike voltage is applied to the coil of the motor stator, causing a voltage surge to the coil. Frequent overvoltage surges can cause premature motor failure.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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