| 摘要 |
PURPOSE:To automatically indicate the timing from the start to the end of altering the set speed by utilizing the calculating function of a microcomputer. CONSTITUTION:A DC power obtained from a converter 1 is converted via a voltage type inverter 2 into an AC power of variable frequency and voltage, the AC power is then supplied to a synchronous motor 3, and the load 4 of a motor 3 is driven to a set speed. The gate control signal of the inverter 2 is applied from a microcomputer 5. In order to protect the inverter 2, a shortcircuit current detection signal due to the detection of the current of a smoothing condenser 6 and a load shortcircuit detection signal due to the detection of a load current are loaded to the microcomputer 5. These signals are led through an inverter I/O interface 51 of the microcomputer 5 to a bus line 52. |
