Yaskawa VS-626 MC5 - Manual (Page 132)

6.3 Flux Vector Control
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6.3.4 Autotuning for machine tool spindle motors
CAUTION
D Do not connect a load to the motor when performing autotuning.
Doing so may result in personal injury or equipment damage.
J Precautions before Autotuning
D The VS-626MC5’s autotuning function automatically determines the motor constants while a servo
system’s autotuning function determines the size of a load, so these autotuning functions are funda-
mentally different.
D If a load is connected when autotuning is performed, not only will incorrect motor constants be re-
corded, but the motor may operate erratically or unexpectedly. Please disconnect load before perform-
ing autotuning.
D The motor shaft will rotate when autotuning is performed. Confirm safety before starting autotuning.
D For winding change motors, conduct autotuning of motor 1 and 2.
J Acquisition of Motor Data
When autotuning motors for machine tool spindles, it is necessary to check the following data for the wind-
ing motors (Y- and - windings).
D Leakage inductance (L = L1 + L2)
Refer to Fig.6.11 for details.
D Rated frequency at base speed (Hz)
D Rated current at base speed (A)
D No-load voltage at base speed (V)
D No-load frequency at base speed (Hz)
D Base speed (r/min)
D Number of poles
D No-load frequency at max. speed (Hz)
D No-load voltage at max. speed (V)
L1 R1 R2/s L2
Rm
Lm
R1 Primary resistance
R2 Secondary resistance
S Slip
Rm Iron loss resistance
Lm
Excitation inductance
Fig
6.11 Motor equivalent circuit (For one phase, Converted to Y-winding)
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