Brushless dc motor

Details Brushless dc motor Brushless dc motor

Category

H - Electricity

Subcategory

02

Subsubcategory

K

CPC

310/79

IPC codes

H02K 29/00 (2006.01) H02K 29/06 (2006.01)

Type

Patent

Patent number

CA 1260522

Description

BRUSHLESS DC MOTOR Abstract of the Disclosure A brushless DC motor having a number of armature poles which is neither a multiple for a submultiple of the number of field poles, thereby providing a relatively high cogging-ripple frequency. The field pole facts, which are generally arcuate in cross-section, have centrally disposed depressions. These depressions reduce the torque exerted by the armature when pole boundaries of the armature pass by the centers of the field poles. This reduces both torque ripple and cogging ripple and it doubles the frequency of torque ripple.

Application Number

495113

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