Electric motor having permanent magnet brake

Details Electric motor having permanent magnet brake Electric motor having permanent magnet brake

H - Electricity

02

K

H02K 7/106 (2006.01) H02K 23/64 (2006.01)

Patent

CA 2140950

An electric motor such as a universal series wound motor having permanent magnetic segments mounted within slots formed in the poles of the stator. The permanent magnets are precisely positioned and securely retained within the slots with an injected metal bonding agent having very stable mechanical properties even under severe temperature conditions. The permanent magnets ensure that a predetermined level of braking current exists when the armature is short circuited to effectively dynamically brake the motor. The AC supply signal is rectified to prevent demagnetization of the permanent magnets and to reduce overheating of the permanent magnets caused by the continuous changing of polarity of the AC supply signal. An alternative embodiment describes a modified armature core construction that sufficiently reduces armature eddy current loss to offset the additional heat resulting from the permanent magnet braking members.

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