| 摘要 |
PROBLEM TO BE SOLVED: To provide a power swing detector for a polyphase pulse motor, capable of detecting power swing of a motor without necessity of modeling of an existing driving device.SOLUTION: A power swing detector 31 is connected with the outside of a driver board 7 to detect an electric current for the driver board 7 to energize windings 23A, 23B of a pulse motor 1 with current sensors 32A, 32B. When a change in a waveform of the detected current detects that a rotational direction of the pulse motor 1 is opposite, without following a PWM signal output by the driver board 7, an alarm signal is output to a PLC 6.SELECTED DRAWING: Figure 1 |
