Electricity: motive power systems – Synchronous motor systems – Field winding circuits
Patent
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).
Kawabata Yasutomo
Kusaka Yasushi
Yamada Eiji
Martin David S.
Toyota Jidosha & Kabushiki Kaisha
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