Torque equalized brushless permanent magnet rotor motor

Details Torque equalized brushless permanent magnet rotor motor Torque equalized brushless permanent magnet rotor motor

1974-06-20

1977-03-08

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68C, 310156, 310268, 318254, H02K 1100

Patent

active

040114759

ABSTRACT:
To provide for even running and uniform torque output of pulse-energized motors, elements having soft-iron characteristics are located outside of the air gap, but within the stray, or leakage field emanating from the poles of a permanent magnet rotor, the elements being shaped and located with respect to the windings to exert a braking torque on the rotor when the rotor is in a position with respect to the coils of the motor for efficient energization of the coils, the magnet elements interacting with the field from the rotor during the gaps of energization to release the stored energy therein. The magnet elements may be yoke elements located adjacent, or outside of the air gap, soft-iron sheet metal strips, adjustably positioned on the stator, or the like.

REFERENCES:
patent: 2610993 (1952-09-01), Stark
patent: 3315106 (1967-04-01), Reynst
patent: 3840761 (1974-10-01), Muller
patent: 3845339 (1974-10-01), Merkle et al.
patent: 3891905 (1975-06-01), Muller
patent: 3912956 (1975-10-01), Muller
patent: 3953751 (1976-04-01), Merkle et al.

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