Can an inverter-driven motor operate at no load for a long time?
Thread Content
The unit is air-cooled, and the motor is an inverter-driven motor. Due to operational requirements, I don’t want to restart it repeatedly. Therefore, during long periods of operation at no load, that is, when the motor is running but with a frequency of zero, the impeller does not rotate! Will staying in this state for a long time have any adverse effects on the motor?
There shouldn’t be any major problems, as long as the small fan at the back is running.
The key is whether your inverter supports it We’ll have to give it a try to find out.
Our mud pumps have the issue you mentioned: when the variable frequency drive is set to zero speed, the motor doesn’t rotate but there is a beeping sound; no problems have occurred for a long time.
Mm! We also run for long periods of time. It’s been a week and no problems have been detected for now; I’m not sure if this approach is reasonable
Hello! The frequency range of variable-frequency motors is generally 3–50 Hz or 5–50 Hz ； Motor manufacturers do not allow this to be done; although it might not cause any problems, they will not provide after-sales support if the motor gets damaged. In fact, the power consumption at 5Hz is already very low, at around 1/1000 of the rated power~~
As a supplementary note, it is also possible to increase the frequency to above 50HZ, but the pump you are using might experience overload; therefore, calculations are necessary. Some variable-frequency motors come with their own fans, so the motor should still be able to function even if it isn’t rotating； But for some variable-frequency motors, the fan is connected to the shaft (at synchronous speed), and I personally think that’s not acceptable~
It’s not good; since it’s a long-term operation, the machine can be shut down. With frequency conversion control, starting and stopping operations are also possible in that mode. If you keep the frequency conversion system running continuously like this, it’s problematic.
There should be no major issues with variable-frequency motors; doing this to ordinary motors may lead to poor heat dissipation.
If there is no problem with the cooling fan of the variable-frequency motor, then there should be no issues; after all, it’s a variable-frequency motor, designed to operate at variable frequencies.