US 5,969,500 AGranted

Control system and method for motors

AssigneeAisin Aw Co., Ltd.

InventorsMasami Ishikawa, Shinichi Otake, Ken Iwatsuki

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Abstract

In a motor control system and method controlled by a d-axis current command value i.sub.ds and a q-axis current command value i.sub.qs, a d-axis voltage command value V.sub.d * and a q-axis voltage command value v.sub.q * are computed on the basis of d-axis current deviation .DELTA.i.sub.d of d-axis current value i.sub.d from the d-axis current command value i.sub.ds and q-axis current deviation .DELTA.i.sub.q of q-axis current value i.sub.q from the q-axis current command value i.sub.qs and on the basis of q-axis inductance value L.sub.q and d-axis inductance value L.sub.d wherein the inductance values L.sub.q and L.sub.d are tuned or adjusted so that the d-axis current deviation .DELTA.i.sub.d and q-axis current deviation .DELTA.i.sub.q approach zero.

Claims8

Dependent claims

A motor control system comprising:

current sensors for detecting values of currents in individual stator phases of a motor;
a magnetic pole detector for detecting a position of a rotor magnetic pole of the motor;
a first converter for converting the detected values of currents of the individual stator phases into a d-axis current value and a q-axis current value based on the detected position of the rotor magnetic pole;
voltage command value computing means for computing a d-axis voltage command value and a q-axis voltage command value on the basis of corresponding deviations of the d-axis and q-axis current values from respective d-axis and q-axis command current values and on the basis of q-axis and d-axis inductance values;
inductance tuning means for tuning the respective q-axis and d-axis inductance values so that the d-axis current deviation and the q-axis current deviation is reduced to zero;
a second converter for converting the d-axis and the q-axis voltage command values into voltage command values of individual stator phases in accordance with the position of the rotor magnetic pole;
and
a pulse width modulator for generating pulse width modulating signals of the individual stator phases on the basis of the voltage command values of the individual stator phases.

5 more elements

A motor control method comprising:

detecting current values of individual stator phases;
detecting the position of a rotor magnetic pole;
converting the current values of the individual stator phases into a d-axis current value and a q-axis current value on the basis of the position of the rotor magnetic pole;
computing a d-axis voltage command value and a q-axis voltage command value on the basis of corresponding deviations of the d-axis and q-axis current values from respective d-axis and q-axis command current values and on the basis of q-axis and d-axis inductance values;
tuning the q-axis and d-axis inductance values so that the d-axis and q-axis current deviations approach zero;
converting the d-axis and q-axis voltage command values into voltage command values of the individual stator phases on the basis of the position of the rotor magnetic pole;
and
generating pulse width modulation signals of the individual stator phases on the basis of the voltage command values of the individual stator phases.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/110,656Filed 7 Jul 1998
Priority: JP 9-1814837 Jul 1997
Granted: 19 Oct 1999
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

B60L 15/025
Characterised by the form of the current used in the control circuit: using field orientation; Vector control; Direct Torque Control [DTC]
B60L 50/60
Using propulsion power supplied by batteries or fuel cells: using power supplied by batteries
B60L 2220/16
Electrical machine types: dC brushless machines
Y02T 10/64
Other road transportation technologies with climate change mitigation effect: electric machine technologies in electromobility