| 摘要 |
A permanent magnet synchronous machine having a base speed is controlled in response to a d-axis current command Idse*. A torque command Te* is determined and an angular velocity omegar of the machine is sensed. A maximum torque per ampere value is calculated for producing the commanded torque Te* at speeds below the base speed. The angular velocity omegar is compared with the base speed. If the angular velocity omegar is less than the base speed, then the maximum torque per ampere value is employed as the d-axis current command Idse*. If the angular velocity omegar is greater than the base speed, then the maximum torque per ampere value adjusted by a field-weakening factor proportional to the angular velocity omegar is employed as the d-axis current command Idse*.
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