| 摘要 |
<p>PURPOSE:To prevent the reduction of a regenerative brake at the time of transfer from one pulse operation region to a plural pulse operation region by compensating an excitation current section in a motor current control pattern during one pulse operation even in a V/f constant control region at the time of the control of the regenerative brake. CONSTITUTION:A control target value, in which an excitation current section arithmetically operated by an excitation current arithmetic section 2 is added to a motor-current control pattern generated from a motor-current control pattern generating section 1, and motor actual currents detected by a motor- current detecting section 3 are compared. A modulation circuit 4 controls a pulse width modulation pulse generator 5 on the basis of the result of the comparison. The excitation current arithmetic section 2 is divided into first and second excitation current arithmetic sections 2a, 2b at that time. A gate 6 is closed when an inverter circuit is operated at one pulse mode, and a gate 7 is closed when the inverter circuit is operated at modes except one pulse mode.</p> |
