Title: No-back control for a permanent magnet rotor motor

Abstract: The invention provides a quiet, reliable and quick acting "no-back" action for synchronous motors utilizing permanent magnet rotors which have minimum power in self-starting and are prone to be erratic in direction of starting. This fallibility arises at least in part from the expense and difficulty of working to the accuracy which would be required to make the motor less uncertain in starting.

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Inventors: Hammond, Robert J. (Stevensville, MI, US)

Application Number: 510384
Filing Date: 1974-09-30
Publication_date: 1976-08-17
Assignee: V-M Corporation (Benton Harbor, MI)
Primary Class(es): 310/41 192/44, 310/76, 310/164
Other Classes:
US Patent Ref:

3333125	Jul, 1967	Grabow	310/41.
3333129	Jul, 1967	Kohlhagen	310/164.
3427485	Feb, 1969	Dotto	310/41.
3501658	Mar, 1970	Morley	310/41.
3518031	Jun, 1970	Randall	192/45.
3735174	May, 1973	Bosch	310/266.
3751697	Aug, 1973	Morley	310/41.
3767019	Oct, 1973	Wingler	192/45.
3809932	May, 1974	Erwin	310/41.
3842296	Oct, 1974	Gerber	310/41.

Other Refs: 1,178,641

May, 1959	FR

Primary Examiner: Skudy, R.
Assistant Examiner:
Attorney: Johnson, Dienner Emrich & Wagner