Method and apparatus for synchronously driving AC synchronous mo

Details Method and apparatus for synchronously driving AC synchronous mo Method and apparatus for synchronously driving AC synchronous mo

1981-01-16

1983-03-15

Weldon, Ulysses

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Synchronizing or phasing control

318 41, 318 49, 318 69, H02P 546

Patent

active

043769136

ABSTRACT:
A plurality of AC synchronous motors used to drive respective machines in a manufacturing or packaging assembly line or system are driven in speed and phase synchronization. A common AC current supply signal is inverted to provide one polyphase set of series of controlled frequency low voltage DC pulses in a lead inverter. This polyphase set of pulses are amplified and utilized to drive the AC synchronous motor for the lead machine in the system. This same set of polyphase pulses are also transmitted directly to follower inverters respectively and there amplified to drive respective synchronous motors in the system to not only insure speed synchronization but also absolute phase synchronization in driving all machines in the line. When the frequency of the polyphase set of pulses is varied to correspondingly drive the AC synchronous motors at predetermined speeds, phase synchronization of the motors will always be insured. The AC synchronous motor drives are further adapted to automatically position all of the machines in the line to their respective start positions for position synchronization of the line through the use of position sensors on each machine.

REFERENCES:
patent: 3461367 (1969-08-01), Takeyasu et al.
patent: 3600655 (1971-08-01), Karlin et al.
patent: 3757179 (1973-09-01), Pedersen
patent: 3967170 (1976-06-01), MacDonald et al.

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