Rotor reluctance notch for cogging control

Details Rotor reluctance notch for cogging control Rotor reluctance notch for cogging control

1983-11-03

1985-03-12

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 49R, 310217, 310261, H02K 2112

Patent

active

045047553

ABSTRACT:
In an electric motor of the type having a permanent magnet rotor which is subject to cogging torque, a plurality of skewed reluctance notches are cut in the outer diameter of the rotor laminations. The rotor laminations have first and second sets of axial openings which are filled respectively with rare earth magnet material and non-ferrous casting material.

REFERENCES:
patent: 1150049 (1915-08-01), Martin
patent: 1408890 (1922-03-01), Kimble
patent: 2245433 (1941-06-01), Delmonte
patent: 2432436 (1947-12-01), Morrill
patent: 3083311 (1963-03-01), Krasnow
patent: 3181018 (1965-04-01), Shafranek et al.
patent: 3979821 (1976-09-01), Noodleman
"Brushless Servomotors Use Notched Magnet to Stop Cogging", Electronic Design, Nov. 11, 1982, p. 38.

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