| 摘要 |
A driver( 1) includes a controller to add a reverse AC vector to a driving vector of an inverter drive motor (9) in order to brake the motor (9). In the preferred form the controller includes a set of pulse stretchers (5-9) which are responsive to an applied trapezoidal waveform to adjust the pulse widths of input signals to an inverter (2) thereby adding an extra contra-rotating voltage vector to the main output voltage vector. |
