초록 ▼

In a plural phase electric motor, a control method senses regeneration current from a non-energized phase and commutates to the next state. In the next state, the unenergized phase of the present state is energized in a polarity opposing the regeneration current of the present state, such that durin

In a plural phase electric motor, a control method senses regeneration current from a non-energized phase and commutates to the next state. In the next state, the unenergized phase of the present state is energized in a polarity opposing the regeneration current of the present state, such that during the next state, energization current is directed in the last noted phase in a direction opposite to the regeneration current of the present state. In the state prior to the present state, the unenergized phase of the present state is energized in a polarity aiding the regeneration current of the present state, such that during the prior state, energization current is directed in the last noted phase in the same direction as the regeneration current of the present state. In the preferred embodiment, all of the commutation switches are periodically simultaneously turned off for a given blanking interval, and the regeneration current is sensed on a common DC bus during such interval.

대표청구항 ▼

A method of controlling a three phase electric motor comprising energizing said phases in a cyclic sequence comprising a plurality of states, 1, 2, 3, and so on, wherein during each state, two of the phases are energized and the third phase is unenergized, sensing regeneration current from the unene

A method of controlling a three phase electric motor comprising energizing said phases in a cyclic sequence comprising a plurality of states, 1, 2, 3, and so on, wherein during each state, two of the phases are energized and the third phase is unenergized, sensing regeneration current from the unenergized phase, and commutating to the next state in response to said regeneration current, and further comprising: providing a plurality of switches; energizing said phases in said cyclic sequence through said switches; periodically turning off all of said switches simultaneously for a given blanking interval; sensing said regeneration current during said blanking interval.