Can high-speed motors be speed-controlled using ordinary frequency converters?
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The speed control inverter associated with the high-speed motor of my friend’s lathe (with a rated power of 0.75 KW, voltage of 380 V, frequency of 300 Hz, and speed of 18,000 rpm) is broken. I was able to achieve the desired speed by using an ordinary inverter to set the frequency, but the motor overheated very quickly! It cannot be used properly! There’s nothing wrong with the motor itself; please, fellow sailors, help analyze it!
A regular frequency converter can only be set to a maximum of 100Hz; if you force it to 300Hz, the first thing to get damaged is the frequency converter itself
The frequency range on the label of Xilin’s EH600 inverter is set at 0-650Hz
The rated current and frequency of the inverter must both be set
When a general-purpose frequency converter is used with high-frequency motors, the current increases as the carrier frequency decreases; therefore, the carrier frequency can be increased appropriately； High-speed motors generate relatively large values of harmonic currents; therefore, when selecting an inverter, its capacity should be slightly larger than that required for ordinary motors. With a constant moment of inertia, the speed control range needs to be wider, and the acceleration/deceleration times should also be set to be longer.
The parameters aren’t set correctly; the motor will get hot