Motor
AssigneeSeiko Epson Corporation
InventorsKesatoshi Takeuchi, Takahiro Sagawa
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Abstract
The electric machine of the present invention comprises a first coil group containing a plurality of coils and a magnet group. The first coil group is classified into M phase sub coil groups, with the coils of the sub coil groups aligned one at a time in sequence at a specified sub coil group interval Dc from the first phase sub coil group to the M-th phase sub coil group. A sub coil group interval Dc is set to a value of K/M times a magnetic pole pitch Pm (K is a positive integer excluding an integral multiple of M) where the distance corresponding to an electrical angle of π is defined as the magnetic pole pitch Pm. The adjacent sub coil groups are driven at a (K/M)π phase difference. Each coil have substantially no magnetic material core.
Claims13
An electric machine comprising:
- a first coil group containing a plurality of coils arranged along a specified direction;
- and
- a magnet group facing the first coil group and capable of moving relative to the first coil group along the specified direction;
- wherein the first coil group is classified into M phase sub coil groups each constituted by n coils where M is an integer of 2 or more and n is an integer of 1 or more, and the coils of the sub coil groups are aligned in sequence one at a time with a specified sub coil group interval Dc from the first phase sub coil group to the M-th phase sub coil group along the specified direction, the sub coil group interval Dc is set to a value of K/M times a magnetic pole pitch Pm (K is a positive integer excluding an integral multiple of M) where the magnetic pole pitch Pm is defined, in relation to the magnet group, to be a distance corresponding to an electrical angle of n along the specified direction,
- the adjacent sub coil groups are driven at a phase difference of (K/M)π, and
- each coil has substantially no magnetic material core.
Dependencies are inferred from the claim text.