Commutator motor

Details Commutator motor Commutator motor

1995-01-19

1997-09-30

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 50, 388937, 318280, 81469, H02K 1100

Patent

active

056729227

ABSTRACT:
In a non-commutating-pole commutator motor, in particular as the drive of a power hand tool, a device for reversing the direction of rotation includes a switch (8) for reversing the direction of current in the rotor winding, and a brush apparatus (4) mounted immovably in the motor casing. The rotation of the plane defined by the commutating coils is chosen in such a manner that good commutation is assured in one of the two directions of rotation at full motor output. Furthermore, the switch (8) for reversing the direction of rotation yields the preferred direction of rotation in a first switch position and the opposite direction in a second switch position. In the switch position for the preferred direction, a smaller number of turns of the field winding (1, 2) in the electric circuit of the motor is effectively provided while, in the opposite direction of rotation of the motor, a larger number of turns is effectively provided.

REFERENCES:
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patent: 4633156 (1986-12-01), Besson et al.
patent: 4995094 (1991-02-01), Aio
patent: 5063319 (1991-11-01), Mason et al.
patent: 5089729 (1992-02-01), Moores

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