US 6,982,532 B2 | ||
Electric machine | ||
Paul Steven Mullin, Xenia, Ohio (US); Albert Keith Pant, Carlisle, Ohio (US); Dan Mircea Ionel, Fox Point, Wis. (US); Brian Thomas Branecky, Oconomowoc, Wis. (US); William Louis Mehlhorn, Menomonee Falls, Wis. (US); Alan Edward Lesak, Franklin, Wis. (US); and Anthony Joseph Coloma, Troy, Ohio (US) | ||
Assigned to A. O. Smith Corporation, Milwaukee, Wis. (US) | ||
Filed on Dec. 08, 2003, as Appl. No. 10/730,153. | ||
Prior Publication US 2005/0122073 A1, Jun. 09, 2005 | ||
Int. Cl. H02P 6/00 (2006.01) |
U.S. Cl. 318—254 | 74 Claims |
1. An electric machine comprising:
a stator assembly having a stator core and a coil supported by the stator core;
a rotor assembly having a shaft and a rotor supported by the shaft for rotation with the shaft relative to the stator core,
the rotor having a first magnetic pole and a second magnetic pole, the rotor being in magnetic interaction with the stator
core;
a single sensor configured to detect magnetic polarities of the rotor as the rotor rotates relative to the sensor and to generate
a signal representing the detected magnetic polarities of the rotor, the signal being in a first state when the first magnetic
pole is detected and a second state when the second magnetic pole is detected, the signal being inverted to form an inverted
signal, the signal being utilized to control current through the coil in a first direction when the signal is in the first
state and the inverted signal being utilized to control current through the coil in a second direction when the signal is
in the second state, the current through the coil resulting in an alternating magnetic field in the stator core; and
wherein at least a portion of the rotor and at least a portion of the shaft are encapsulated in an encapsulation material,
and wherein the encapsulation material connects the rotor to the shaft.
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