H - Electricity – 02 – K
Patent
H - Electricity
02
K
310/73
H02K 1/22 (2006.01) H02K 1/27 (2006.01) H02K 7/04 (2006.01) H02K 29/00 (2006.01)
Patent
CA 1112705
ABSTRACT OF THE DISCLOSURE In a DC brushless motor including a rotor assembly having permanent magnets and a stator assembly having coils arranged in the magnetic field generated by the permanent magnets of the rotor assembly, with the energization of the coils being controlled so as to impart a rotational torque to the rotor assembly; the permanent magnets of the rotor assembly are flat and are attached to a rotor yoke, which can be constructed as an octagonal prism, to provide a path for the magnetic flux emanating from the magnets and to support the flat magnets so that the latter form substantially a regular polygon in cross section. The magnets can be arranged with their poles in a north-south-north-south sequence against flat side walls of the rotor yoke to provide a flux density pattern that is substantially sinusoidal. Alternatively, the flat magnets can be arranged so that magnets of like polariza- tion are disposed on either side of selected cornets of a polygonal rotor yoke, thereby providing a flux density pattern that is substantially trapezoidal or rectangular.
311187
Ishii Hirohisa
Okamura Toshihiko
Shishikura Masami
Gowling Lafleur Henderson Llp
Sony Corporation
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