| 摘要 |
<p>A method of determining the steed of a 3 phase AC motor, where said AC motor is controlled by a control circuit 2 outputting six switching element control lines to a motor inverter circuit 1, said six lines representing an upper and lower line for each of the three phases, characterised in generating a speed and/or direction feedback signal dependent on the output from at least three of said lines.</p> |
