| 摘要 |
<p>A safety device for an electronically commutated motor 14, has an inverter 13 connected to the circuit 10 for controlling the motor and monitors the speed of the motor during special operation. Should a speed signal be greater than a specified maximum value, the safety device interrupts 16 the energy supply to the motor. A first speed signal is formed directly by a sensor 15, and a further speed signal is formed by sensing the current in at least one of the phase supply lines 17 to the motor 14 by a sensor 18, 18'. <IMAGE></p> |
