| 摘要 |
PURPOSE:To reduce the offset error by controlling the third phase with a signal that the symbol of the sum of the outputs of PID (proportional, integrating and differentiating) controllers are inverted. CONSTITUTION:The current values flowed to the first and second phases of 3- phase stator windings are fed back, compared by a counted value of adders 10, 11 to obtain the first and second phase current commands from PID controllers 13, 14, respectively. On the other hand, the third phase current command is not calculated, the outputs of the controllers 13, 14 are input to an adder 28, and the signal that the symbol of the sum of the output of the controller 13 and the output of the controller 14 is inverted is input to a power amplifier 18. Thus, the offset error can be suppressed to the prescribed range, thereby saving a multiplier, a D/A converter, the PID controller and a current detector for one phase. |
