Compared with low-voltage motors, high-voltage motors are much more likely to be used as variable-frequency motors. The average user rarely knows this. The editor of Dalan Motor believes that it is necessary to popularize this knowledge and let all motor users know.
1. High-voltage motor inverter power supply with different ventilation and cooling methods
Common high-voltage motor ventilation and cooling methods are self-fan cooling and forced ventilation. From the perspective of sufficient heat dissipation and cooling effect, there is no difference between the high-voltage motor and the low-voltage motor, but considering the corona and distributed capacitance problems of the high-voltage motor, it is recommended to take the following measures according to the characteristics of the high-voltage motor:
(1) Protective motor: It is preferable to force the air to cool, and ventilate as much as possible to avoid debris entering the motor.
(2) Enclosed motor: Forced air cooling is also preferred. When the minimum operating speed does not seriously affect the ventilation and cooling effect, a fan structure with a shaft end can also be used.
(3) The insulation of the end of the formed coil wire is strengthened or the insulation of the first turn of the head and tail is strengthened.
(4) Immerse the paint again after vacuum pressure dipping.
(5) Install lightning protection and surge protection devices in the junction box.
Second, the impact of inverter power supply on high-voltage motors
Like low-voltage motors, it will adversely affect the motor's efficiency, temperature rise, noise and vibration and other performance indicators, and damage the insulation system. In addition, the high-voltage motors powered by the inverter have a higher probability of failure and more complicated problems.
(1) Intensify the internal corona phenomenon and accelerate the insulation aging.
(2) The capacitance at the armature end cannot be ignored, and the high-frequency capacitance current is large.
(3) The shaft current problem is more serious, and bearing overheating damage is very common.
(4) High-frequency miscellaneous consumption leads to local overheating.
(5) The thermoelectric slow-release damage leads to normal operation at the initial stage, gradually increasing until the insulation system collapses and burns the motor.
----- Responsible Editor: Dalan Oil Pump Motor 02-Procurement Consultant
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