H - Electricity – 02 – K
Patent
H - Electricity
02
K
310/74
H02K 21/46 (2006.01) H02K 21/04 (2006.01) H02K 21/22 (2006.01)
Patent
CA 1245700
ABSTRACT: A synchronous A.C. electrical motor comprising (A) a stator having a body of slotted, soft ferromagnetic; low eddy current loss material, the slots having A.C. power windings to produce a rotating magnetic field, an excitation coil energizable with single phase A.C. located in two adjacent slots with a pole piece betweeen them, and feedback windings located in slots such that when A.C. potential therefrom is conveyed to the excitation coil the excitation A.C. is modified to a selected phase and magnetude to improve the "pull in" torque of the motor, a capacitor containing circuit connecting the feedback windings and the excitation coil, the body of ferromagnetic material having a circular cylinderical surface, and the improvement characterized in that (B) a rotor has three major components electrically and magnetically associated, (1) first being an exterior layer of a low electrical conductivity magnetizable permanent magnetic material having an outside cylinderical surface complementary to that of the stator, (2) a high permeability, low eddy current component to which the first layer is attached, and (3) the third component being a supporting body of ferromagnetic material of high permeability and high electrical conductivity on which the second component and first layer are fixedly supported. The third component can be a solid ring of steel, for example, or it can be a laminated core containing shorted electrical conductors. In starting from standstill, the power windings are energized with A.C. power and this produces a circulating electrical current with the third component of the rotor which reacts to produce rotational torque. After the rotor reaches about 70 to 80% of synchronous speed, the excitation coil is energized and this will produce strong alterating magnetic flux in the pole piece which magnetizes the layer of the permanent magnetic material into a pattern of north and south magnetic poles in the proper phase with the rotating field of the stator so as to produce a powerful rotational torque that accelerates the rotor to a predetermined synchronous speed.
497186
Barber Ronnie J.
Roesel John F. Jr.
Gowling Lafleur Henderson Llp
Precise Power Corporation
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