H - Electricity – 02 – K
Patent
H - Electricity
02
K
310/82
H02K 1/22 (2006.01) H02K 11/00 (2006.01) H02K 19/36 (2006.01) H02K 21/38 (2006.01)
Patent
CA 1140975
Case 2572 PERMANENT MAGNET ALTERNATOR WITH CLAW TYPE ROTOR AND MEANS TO ADJUST THE EXCITATION MODULE ABSTRACT OF THE DISCLOSURE A dynamoelectric machine and, particularly an alternator, has a claw type rotor in which the magnetic field is induced by permanent magnets. The claw type rotor has a spider of magnetic material secured to the rotor shaft and having a first set of claws on the periphery. An annular disc of magnetic material is mounted to said spider and is spaced axially from said spider by a non-magnetic ring. A second set of claws is on the periphery of the annular disc and these are interleaved with the first set of claws. An excitation module is mounted within the casing of the machine and this module has one surface facing the spider and another facing the annular disc. The permanent magnets are mounted on one of these surfaces, preferably on the surface facing the disc. The magnets thus provide flux across the air gap to the spider to induce poles of one polarity in the first set of claws, and across the air gap to the disc to induce poles of the other polarity in the second set of claws. A straight axial movement of the excitation module will adjust the air gap at the permanet magnets. A screw arrangement is provided to move the excitation module axially to reduce the attractive forces due to the permanent magnets to aid in assembly and disassembly. Also, a field winding may be provided on the excitation module to control the flux at the poles during running, and to reduce the attractive force caused by the permanent magnets to aid in assembly and disassembly.
339013
Canadian General Electric Company Limited
Eckersley Raymond A.
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