초록 ▼

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

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.

대표청구항 ▼

[ What is claimed is:] [1.] A control apparatus for a polyphase ac motor, comprising:a battery;an inverter circuit, connected to the battery, said inverter including a plurality of sets of switches, each of said sets of switches having a series combination of two switching elements, wherein two ends

[ What is claimed is:] [1.] A control apparatus for a polyphase ac motor, comprising:a battery;an inverter circuit, connected to the battery, said inverter including a plurality of sets of switches, each of said sets of switches having a series combination of two switching elements, wherein two ends of each of said sets of switches are connected to the battery, and a junction between the two switching elements in each of said sets of switches is electrically connected to a respective terminal of the polyphase ac motor; anda vector controller for controlling the inverter circuit on the basis of a torque-current command value and a magnetizing-current command value;wherein the vector controller comprises:a) command value calculating means for calculating a motor-torque command value on the basis of a required torque such as a degree of depression of an accelerator pedal;b) operation mode judging means for judging an operation mode to be a quicker-torque-response mode or a higher-efficiency mode, the quicker-torque-response mode having quicker torque response than the higher-efficiency mode, the higher-efficiency mode having higher energy efficiency than the quicker-torque-response mode;c) first calculating means for, in cases where the operation mode judging means 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; andd) second calculating means for, in cases where the operation mode judging means judges the operation mode to be the quicker-torque-response mode, fixing the magnetizing-current command value to a present value thereof and calculating the torque-current command value from the fixed magnetizing-current command value and the motor-torque command value.