Method and apparatus for controlling motor

Details Method and apparatus for controlling motor Method and apparatus for controlling motor

1994-09-16

1996-04-02

Ro, Bentsu

Electricity: motive power systems

Constant motor current, load and/or torque control

318530, 318537, 318719, 318139, H02P 706

Patent

active

055044042

ABSTRACT:
In a method and an apparatus for controlling a motor, one type or a plurality of types of weakening current are previously set, a first torque command current determined from a speed deviation between a speed command to the motor and the present speed of the motor is compared with torque currents corresponding the torques, so that a second torque command current and a weakening current are determined and outputted depending on which range of the torque currents corresponding the torques the first torque command current falls upon. Thus, the second torque command current and the weakening current can be determined simply and efficiently. According to another method and apparatus, the weakening current and the torque current are determined while the weakening factor is varied as appropriate, on the conditions that the sum of voltage vectors of sections of the motor falls within a restrictive circle that depends on the applied voltage to the motor and that the torque current should be equal to a value resulting from multiplying the torque command current determined from the speed deviation with the weakening factor. Then, the motor can produce the maximum torque with less weakening current, thus being capable of maximum efficiency control.

REFERENCES:
patent: 3845368 (1974-10-01), Elco
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patent: 4678248 (1987-07-01), Depenbrock
patent: 5168204 (1992-12-01), Schauder
"Flux-Weakening Regime Operation of an interior Permanent-Magnet Synchronous Motor Drive", IEEE Transactions on Industry Applications, vol. IA-23, No. 4, Jul./Aug. 1987, Thomas M. Jahns.

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