[LinuxGuru]

Hi!

I'm bought Chinese 1.5kW 24000 rpm 220V 3-phase air-cooled spindle on eBay, and Yaskawa J1000 drive (rated at 1.5/2.2kW, 230V/single phase input, 230V/3phase output).
Spindle was cheap and thus the quality - runaway is 0.2mm (which possibly I will repair), and exhibit strange problems.
It has 3-pin connector (without 4th for GND), and no marking at all on terminals. Engraving on motor have some Chinese letters, power/voltage rating 1.5kW/220V/400Hz, and some numbers (probably part # 200730184245.5).
Coil resistance between all 3 pins is equal to 4.28 Ohms, inductance 47 ...53 mH at 100 Hz.
Due to poorly constructed air cooling system minimum recommended speed is 8000 rpm, I've got around this by lowering output voltage from inverted drive to 30 - 50V.
Spindle and inverted connected with thick unshielded cable only 1.5m long.
Currently there are no load on the motor whatsoever.

Parameters on Yaskawa J1000:
E1-04 Maximum output frequency = 400 Hz
E1-05 Maximum output voltage = 50 V (see notes)
E2-01 Motor rated current = 8 A
C6-02 Carrier frequency = 10 KHz (lowered from 15 KHz)
E2-05 Motor resistance 4.28 ohm
L1-01 Motor overload protection (2 - protection for inverter motor)
C1-01 Acceleration Time = 30 s
Mode - heavy duty
The rest are factory defaults which should be OK.

Motor speed controlled by frequency entered from the front operator panel.
Vout = 50V, F = 3 Hz - OK
Vout = 50V, F <= 220 Hz - OK
Vout = 50V, F > 220 Hz - motor accelerates, then decelerated and stops with no error messages. STOP from panel spins motor again, then it stops. I assume it simply stalls for whatever reason.
if motor runs, it runs smoothly with quite low audible noise level at whatever speed. Unfortunately, I don't have RPM meter, but at a sight it can spin very fast.

Increasing output voltage (even to 100V) from the inverter results in overload error, or overheating motor even at high speed (F = 120 Hz).

Anyone have a clue what is going wrong?
Thanks in advance for any help.

[Eldon_Joh]

torque is proportional to voltage squared (per hz)

the motor stalling past 220hz is a serious problem, especially since there is no error code. almost certainly the vfd.

concerning the pwm frequency, higher is better for the motor, but more heat for the vfd.

seems to me your motor needs to see 220vac at 24,000 rpm which should be 400hz. at lower frequencies the voltage is reduced.

50 volts at 3 hz is too much in my opinion. this initial value, 50, should be the boost volts.

the motor will probably not run well at 50 volts at 220hz, it needs to see about 110 minimum at that frequency, but i still expected it to trigger over current error on the vfd at those conditions.