Linear hybrid brushless servo motor
First Claim
1. A linear hybrid brushless servo motor, comprising:
- a forcer having a plurality of stacks with stack slots, the stacks comprising two U-shaped stacks positioned at each end of the forcer, and two E-shaped stacks positioned between the two U-shaped stacks, a magnet positioned between each stack, and three phase coils wound in the stack slots to form three corresponding phase assemblies; and
, a platen having a plurality of alternating teeth and slots directed transversely to a direction of movement, and a yoke having a path through which magnetic fluxes may pass.
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Abstract
An improved linear hybrid brushless servo motor is disclosed. The motor comprises a forcer and a platen. The forcer has a plurality of stacks, permanent magnets, and coils which form a three-phase motor. The platen has a low cost ferromagnetic steel plate. The stacks, permanent magnets and phase coils of the forcer are specially designed to have the optimal electromagnetic coupling between the forcer and platen to achieve a high force density servomotor. In one embodiment, two E-shaped stacks are used to physically couple two phases to substantially minimize the unexpected cogging force and force ripple. Three other forcer configurations which achieve a three-phase, highly cost effective and high force density linear hybrid brushless servo motor are also disclosed.
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Citations
69 Claims
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1. A linear hybrid brushless servo motor, comprising:
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a forcer having a plurality of stacks with stack slots, the stacks comprising two U-shaped stacks positioned at each end of the forcer, and two E-shaped stacks positioned between the two U-shaped stacks, a magnet positioned between each stack, and three phase coils wound in the stack slots to form three corresponding phase assemblies; and
,a platen having a plurality of alternating teeth and slots directed transversely to a direction of movement, and a yoke having a path through which magnetic fluxes may pass. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A linear hybrid brushless servo motor, comprising:
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a forcer having a plurality of stacks with stack slots, the stacks comprising six U-shaped stacks, a magnet positioned between adjacent U-shaped stacks, and three phase coils wound in the stack slots to form three corresponding phase assemblies, each phase assembly comprising two adjacent U-shaped stacks, and two displacers positioned between adjacent phase assemblies; and
a platen having a plurality of alternating teeth and slots directed transversely to a direction of movement, and a yoke having a path through which magnetic fluxes may pass. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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48. A linear hybrid brushless servo motor, comprising:
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a forcer having a plurality of stacks with stack slots, the stacks comprising two U-shaped stacks positioned at end of the forcer, and two E-shaped stacks positioned between the two U-shaped stacks, a plurality of permanent magnets positioned on top of the U-shaped and E-shaped stacks, a plurality of plates positioned on top of the plurality of magnets, and three phase coils wound in the stack slots to form three corresponding phase assemblies; and
a platen having a plurality of alternating teeth and slots directed transversely to a direction of movement, and a yoke having a path through which magnetic fluxes may pass. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69)
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Specification