Apparatus for controlling a polyphase AC motor in quick-torque a

Details Apparatus for controlling a polyphase AC motor in quick-torque a Apparatus for controlling a polyphase AC motor in quick-torque a

1996-08-02

1998-09-01

Wysocki, Jonathan

Electricity: motive power systems

Induction motor systems

Primary circuit control

318139, H02P 700

Patent

active

058015086

ABSTRACT:
An inverter circuit includes a plurality of sets each having a series combination of two switching elements. Two ends of each of the sets are connected to a vehicle battery. A junction between the two switching elements in each of the sets is electrically connected to a polyphase ac motor. A vector controller is operative for controlling the inverter circuit on the basis of a torque-current command value and a magnetizing-current command value. The vector controller includes a command value calculating device for calculating a motor-torque command value on the basis of a required torque, and an operation mode judging device for judging an operation mode to be a quicker-torque-response mode or a higher-efficiency mode on the basis of various conditions. The vector controller also includes a first calculating device for, in cases where the operation mode judging device judges the operation mode to be the higher-efficiency mode, calculating the magnetizing-current command value and the torque-current command value, which maximizes an energy efficiency, on the basis of the motor-torque command value. The vector controller further includes a second calculating device for, in cases where the operation mode judging device judges the operation mode to be the quicker-torque-response mode, fixing the magnetizing-current command value to a present value thereof or a given value and calculating the torque-current command value from the fixed magnetizing-current command value and the motor-torque command value.

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Fetz et al; High Efficiency Induction Motor Drive with Good Dynamic Performance for Electric Vehicles, 1993, pp. 1-7.
Mizuno et al; "Comparison of Characteristics of an Induction Motor and a Permanent-Magnet Motor in a State of Constant-Output Operation", pp. 1-10 with Partial English Translation, 1993.

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