Heating of motor by using frequency converter
Heating of motor by using frequency converter
(OP)
For checking of operation of frequency converter (4kW 3 phases 400V)we use 0.75kW motor. Unfurtonately motor heats more than it could be.
The frequency converter on my opinion was programmed correct. The rated current of the motor is 2.3A, but measurings shows that it is 3.2A.
Is this converter's programm's mistake or something is doing wrong?
Or this is motor fault?
The frequency converter on my opinion was programmed correct. The rated current of the motor is 2.3A, but measurings shows that it is 3.2A.
Is this converter's programm's mistake or something is doing wrong?
Or this is motor fault?





RE: Heating of motor by using frequency converter
RE: Heating of motor by using frequency converter
What does the VFD say the output current is?
RE: Heating of motor by using frequency converter
RE: Heating of motor by using frequency converter
RE: Heating of motor by using frequency converter
RE: Heating of motor by using frequency converter
What is the operating speed range: ?Hz to ?hz
Are you getting hi current at all speeds ?
Is the VFD a regular V/Hz drive ?
What is the carrier frequency ?
What is the output voltage ?(use a true RMS meter)
Is this a new application or retrofit ?
RE: Heating of motor by using frequency converter
Of additional PWM losses mechanisms - copper ohmic, iron eddy current and hysteresis loss - eddy current PWM induced loss is likely dominating for conventional iron machine (this is not the case of pancake ironless brushless motor).
More info is supposed to be found at
http://www.drbrushless.com/articles/ironloss/
-Alex V.
RE: Heating of motor by using frequency converter
The most common cause of a problem like this is because the motor is being driven overspeed with a load that increases with speed. (Fans pumps etc) The second most common cause is because the output voltage setting of the drive does not match the motor, and the third most common reason is the measurement of the current. It must be measured on the output of the drive (not the input) using an instrument that is not affected by harmonics. i.e. it must be a true RMS measuring device.
Best regards
Mark Empson
http://www.lmphotonics.com
RE: Heating of motor by using frequency converter