Method of making an electronically commutated reluctance motor

Details Method of making an electronically commutated reluctance motor Method of making an electronically commutated reluctance motor

1989-12-19

1991-02-26

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

29606, 29609, 310 42, 310 43, H02K 1502

Patent

active

049951599

ABSTRACT:
A Motor structure and energization scheme provides a high efficiency electronically commutated reluctance motor that is characterized by less iron losses than conventional switched reluctance motors. The motor operates without the reversal of the flow of flux in the stator. Also, the flux switching frequency in the stator is minimized. By eliminating flux reversals and minimizing the flux switching frequency, the electronically commutated reluctance motor is operable over a wide range of speeds with improved efficiency. Structurally, the stator includes unevenly spaced poles which are grouped into pairs separated by a space related to the even spacing of the poles on the rotor. Adjacent pairs of poles on the stator are separated by a spacing which is not equal to the spacing between the poles of a pair. To provide for rotation of the rotor, each pair of poles on the stator is polarized to form poles of opposite polarity such that a magnetic circuit joins the two adjacent poles of the pair. Magnetic circuits linking different pairs of stator poles, which are the source flux reversals and high switching frequencies in conventional motors, are prevented by providing a stator construction that is without low reluctance paths between adjacent pairs of stator poles.

REFERENCES:
patent: 3483613 (1969-12-01), Malcolm et al.
patent: 3802066 (1974-04-01), Barrett
patent: 4080724 (1978-03-01), Gillette
patent: 4102040 (1979-02-01), Rich

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