Electricity: motive power systems – Reciprocating or oscillating motor – Energizing winding circuit control
Patent
1990-11-01
1991-12-24
Stephan, Steven L.
Electricity: motive power systems
Reciprocating or oscillating motor
Energizing winding circuit control
310156, 323368, H02K 2908
Patent
active
050756052
ABSTRACT:
A brushless DC motor includes a rotor having an iron core affixed to a motor shaft. Permanent magnets are affixed to the core and separated by aluminum inserts which are keyed to the core. An annular groove in one end of the rotor core is dimensioned so that its outer diameter coincides with the inner tips of the aluminum inserts. The inner diameter of the groove and its depth provide only minimal clearance around commutation transistors which occupy the space within the groove. The commutation transistors are affixed and electrically connected to a circuit board which, in turn, is secured to the motor body by attachment to a removable motor end plate. With this structure, the commutation transistors are surrounded on three sides by the rotor and are triggered by its drive magnets. This structure permits the commutation transistor to be triggered by a strong magnetic flux which is more accurately directed through the transistor at its switch plane.
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Hendricks Howard F.
Nolt Frank S.
Dougherty Thomas M.
Gore Gregory J.
Penn Engineering & Manufacturing Corp.
Stephan Steven L.
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