Permanent magnet motor closed loop restarting system

Details Permanent magnet motor closed loop restarting system Permanent magnet motor closed loop restarting system

1986-10-10

1987-06-16

Shoop, Jr., William M.

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

318136, 318138, 318254, 318431, H02P 118

Patent

active

046738495

ABSTRACT:
A closed loop drive system for a permanent magnet motor (12) operable in a two-phase drive mode during a start cycle and a single phase drive mode thereafter during which the start cycle is reinitiated if the back EMF generated in a sensing winding (18) falls below a reference value. The permanent magnet motor (12) is driven as a two-phase motor with an increasing frequency input during the starting cycle and after initial starting is driven as a single phase motor as long as the back EMF induced in a stator sensing winding (18) remains above a predetermined value. A restart decision circuit (20) is provided which samples the back EMF induced into the stator winding (18) not being driven during single phase operation and initiates a restart cycle if the induced back EMF during single phase operation falls below a selected reference.

REFERENCES:
patent: 4097788 (1978-06-01), Nygaard et al.
patent: 4275343 (1981-06-01), Fulton et al.
patent: 4455513 (1984-06-01), Fulton et al.
patent: 4492902 (1985-01-01), Ficken et al.

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