Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1976-11-23
1978-04-04
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
310113, 310154, 310155, 310168, 318326, H02K 1100
Patent
active
040829685
ABSTRACT:
A speed detector, particularly useful on a permanent magnet DC motor, for providing a pulse indication from movement of the rotor teeth. During one revolution of the motor, a pulse is provided for each motor tooth. In a preferred embodiment, the pulse pickup probe is formed from a ferromagnetic stud which is anchored to the stator housing and extends through an opening formed in the center of the fixed permanent magnet to a position in close proximity to the rotor. The magnet through which the probe extends provides magnetic flux having a path through the stud and the rotor. The reluctance of the flux path through the rotor varies as a function of the alignment of a rotor tooth with respect to the ferromagnetic stud. The stud is formed to have a pickup end facing the rotor. The diameter of the pickup end is slightly greater than the rotor tooth width. A pickup coil is wound around a reduced diameter portion formed on the ferromagnetic stud, and generally lies within the opening through the permanent magnet. As a rotor tooth passes across the pickup end of the stud, a voltage pulse is induced in the pickup coil. The speed with which these voltage pulses are produced indicates motor speed. A small opening or openings extend from the head of the stud towards the reduced diameter portion for receiving leads which are connected to the pickup coil. A diode can be electrically connected to the pickup coil to produce a unidirectional pulse output.
REFERENCES:
patent: 1998409 (1935-04-01), Klaiber
patent: 2541422 (1951-02-01), Kirkland et al.
patent: 3466477 (1969-09-01), Newill
patent: 3480812 (1969-11-01), Hershberger
patent: 3719841 (1973-03-01), Ritsema
patent: 3967200 (1976-06-01), Tetsugu et al.
patent: 3970979 (1976-07-01), Montagu
Contraves-Goerz Corporation
Duggan Donovan F.
Massung Howard G.
Yeager Robert D.
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