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- 1. How does an inverter change an electric motor's speed?
- 2. Can HEM Motor electric motors be used with an inverter (frequency converter)?
- 3. Should an electric motor on an inverter be connected 230 V delta or 400 V star?
- 4. Can a single-phase (220 V) electric motor be driven by an inverter?
- 5. What happens to electric motor torque and cooling when speed is reduced with an inverter?
- 6. When does an electric motor on an inverter need a separately powered (forced) fan?
- 7. What should be checked before running an electric motor above 50 Hz, beyond its rated speed?
- 8. How is the winding temperature of an electric motor on an inverter protected?
- 9. Why is an inverter not selected only by the electric motor's kW rating?
- 10. What information should I give in the order for an electric motor that will run on an inverter?
- 11. Is a dv/dt or sine filter needed if the cable between inverter and electric motor is long?
- 12. What is bearing current in an electric motor on an inverter, and when is an insulated bearing needed?
- 13. Why should shielded cable and good grounding be used on the inverter output?
- 14. Can several electric motors be run from one inverter?
- 15. How does an inverter affect energy consumption in fans and pumps?
- 16. What should be watched when driving a geared electric motor with an inverter?
- 17. How is inverter starting set up for a conveyor that starts under load?
- 18. Can I drive an old or existing electric motor with an inverter afterwards?
This guide answers questions that come up when a three-phase induction motor is driven by a frequency inverter (VFD): how the speed changes, torque and cooling at low and high speed, inverter selection, motor cable, filters and bearing currents, and what to watch for in fan, pump, conveyor and geared drives.
The answers are based on the drive operation notes in the HEM Motor 2026 technical catalogue. For a decision specific to your application, the speed range, load type and cable length need to be stated in the order.
For a motor that will run on an inverter, you can browse the ranges on the inverter-compatible electric motors page and see the models in stock in the buy electric motors category; the current price is on the product page. You can ask for the right configuration by sending the speed range, load type and cable length on WhatsApp, and if you are replacing an existing motor you can send a photo of the motor nameplate.
Send the motor power, speed, mounting type and quantity on WhatsApp. If you are replacing an existing motor, you can also send a photo of its nameplate.
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