Brushless direct-current motor

Details Brushless direct-current motor Brushless direct-current motor

1978-05-26

1980-01-01

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 46, 310 68R, 310 90, 310268, H02K 2112

Patent

active

041818679

ABSTRACT:
An external-rotor brushless direct-current motor has a pair of rotor plates spaced axially apart and connected together for joint rotation about an upright axis. One of these plates carries an annular multipolar axially polarized magnet. A fixed stator plate extends between the two rotor plates and carries a plurality of angularly equispaced sequentially activatable windings. In addition a flux-return element of soft iron is carried on this stator plate and has an outer periphery formed with projections extending into the flux region of the magnet. These projections may simply be the corners or points of a polygonal flux-conducting element, or may be formed between recesses cut into the periphery of this element.

REFERENCES:
patent: 3840761 (1974-10-01), Muller
patent: 3845339 (1974-10-01), Merkle
patent: 4007390 (1977-02-01), Muller
patent: 4011475 (1977-03-01), Schmider
patent: 4125792 (1978-11-01), Schmider

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