| 摘要 |
PCT No. PCT/JP85/00388 Sec. 371 Date Mar. 3, 1986 Sec. 102(e) Date Mar. 3, 1986 PCT Filed Jul. 10, 1985 PCT Pub. No. WO86/00766 PCT Pub. Date Jan. 30, 1986.When a synchronous motor (6) using a permanent magnetic field is controlled by the control of an inverter (4) receiving a pulse width modulation signal, wherein the reactive component of an armature winding current is defined as Ib, the inductance of the armature winding as L, the counter electromotive force constant of the synchronous motor as K1, and the constant introduced from the pole number of the synchronous motor as K2, the value of the reactive component Ib of the armature winding current is limited so that the multiplied product of K2, L, and Ib does not exceed the value of K1. By the limitation, a saturation degree of the differential signal between a current command signal defined by the peak value of a reference carrier wave and the armature winding current is detected, the phase of the current command signal is changed from the phase perpendicular to the armature winding current to a rotary magnetic field main flux in response to the saturation degree, and the inverter control prevents the decrease of the output power by the pulse width modulation of the synchronous motor.
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