| 摘要 |
PURPOSE:To enable to simultaneously discriminate the synchronization of many hysteresis motors by measuring all currents supplied to the motors, comparing the currents with a reference value and detecting the synchronizing state of the motor. CONSTITUTION:Many hysteresis motors 4a, 4b,..., 4n are connected in parallel through through a breaker 2 and a switch 3 to a power source 1. A measuring current transformer 6 is provided between the breaker 2 and the switch 3, and the secondary current is led to a comparator 7. In the comparator 7, an input terminal 13 of a reference value Id and an output terminal 14 are provided. When the input current becomes Id or lower, it is discriminated that the hysteresis motor device in which the many hysteresis motors are connected in parallel is synchronized. |
