| 摘要 |
PURPOSE:To prevent the generation of vibration by a method wherein a digital process is applied to a signal and actual speed corresponding to speed deviation to generate the first and second phase sine wave signals and furthermore, the third-phase phase current is generated so that the sum of the current commands of U phase, V phase, and W phase may become zero. CONSTITUTION:A current command generating section 31 cotaining a microcomputer performs a digital process for a signal and actual speed corresponding to speed deviation and generates two-phase current commands IU, IV out of U phase, V phase, and W phase. The current command i2 is fed from the arithmetic circuit 32. Three-phase current commands IU, IV are supplied to an arithmetic circuit 32. A W-phase current commands iu, iv, iw are compared with actual phase currents iua, iva detected by converters 13, 14 and the output in an arithmetic circuit 15 respectively and a transistor inverter 17 is driven in accordance with the error. |
