Method and apparatus for driving and controlling synchronous mot

Details Method and apparatus for driving and controlling synchronous mot Method and apparatus for driving and controlling synchronous mot

1994-08-10

1996-10-29

Martin, David S.

Electricity: motive power systems

Synchronous motor systems

Field winding circuits

318721, H02P 146

Patent

active

055699952

ABSTRACT:
A method and an apparatus for driving and controlling a synchronous motor using permanent magnets as its field system are herein disclosed. When a rotational speed of the synchronous motor using the permanent magnets as the field system is more than a base rotational speed, a current condition computing section computes a field weakening reference current in accordance with a battery voltage, a reference torque and a rotational speed. An inverter performs the field weakening control of the the synchronous motor using the permanent magnets as the field system in accordance with the field weakening reference current sent from the current condition computing section to prevent the deterioration of efficiency and the deficiency of output due to the excessive or insufficient field weakening current. The current condition computing section determines optimum reference current by the use of a converged battery voltage, when the battery voltage is converged to a constant value after initial control.

REFERENCES:
patent: 3863120 (1975-01-01), Rettig
patent: 4616166 (1986-10-01), Cooper et al.
patent: 4677360 (1987-06-01), Garces
patent: 4885518 (1989-12-01), Schauder
patent: 5334917 (1994-10-01), Lind
IEEE Transactions on Industrial Electronics, vol. 35, No. 4, Nov. 1988, pp. 547-559, Bimal K. Bose, et al., "A Microcomputer-Based Control and Simulation of an Advanced IPM Synchronous Machine Drive System for Electric Vehicle Propulsion".
"Variable Speed Drive System of Permanent Magnet Synchronous Motors With Flux-Weakening Control", Kelta Hatanaka, et al., pp. 310-315 (with English Abstract and Partial English Translation).

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