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US 2008/0074008 A1Published application
Low vibration hybrid step motor
OwnerTed T. Lininventor
Life of this patent
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Abstract
A hybrid step motor has axially spaced first and second sets of rotor sections (or alternatively different sets of stator sections) characterized by different tooth widths. The rotor/stator tooth width ratio in one set is optimized for one-phase ON operation while the rotor/stator tooth width ratio for the other set is optimized for two-phase ON operation. More generally, the two sets are optimized together for near sinusoidal, torque profile and substantially equal microsteps.
Claims10
A hybrid step motor, comprising:
- a stator having a plurality of stator poles with a plurality of rotationally displaced stator teeth on said poles;
- and
- a multi-section rotor having a plurality of rotationally displaced rotor teeth in magnetic coupling relation to the stator teeth, the rotor including at least one first rotor section and at least one second rotor section axially displaced from the first rotor section the rotor teeth in both rotor sections having a constant rotor tooth pitch, the rotor teeth of the first section displaced from the rotor teeth of the second section by one-half of the rotor tooth pitch,
- wherein at least one of the stator and rotor has axially displaced first and second sets of teeth characterized by different tooth widths, such that a rotor/stator tooth width ratio for a first set of teeth is generally optimized for one phase ON operation and a rotor/stator tooth width ratio for a second set of teeth is generally optimized for two phase ON operation, and the rotor/stator tooth width ratios for the two sets of teeth are together optimized for substantially uniform microsteps.
1 more element
A hybrid step motor, comprising:
- a stator having a plurality of stator poles with a plurality of rotationally displaced stator teeth on said poles;
- and
- a multi-section rotor having a plurality of rotationally displaced stator teeth in magnetic coupling relation to the stator teeth, the rotor including at least one first rotor section and at least one second rotor section axially displaced from the first rotor section, the rotor teeth in both rotor sections having a constant rotor tooth pitch, the rotor teeth of the first section displaced from the rotor teeth of the second section by one-half of the rotor tooth pitch,
- wherein at least one of the stator and rotor has axially displaced first and second sets of teeth characterized by different tooth widths, such that a rotor/stator tooth width ratio for a first set of teeth is at least 0.75 and a rotor/stator tooth width ratio for a second set of teeth is at most 0.59, a ratio of relative tooth widths between the two sets of teeth being selected to be in a range between 0.8 and 0.95 and optimized for substantially uniform microsteps.
1 more element
Dependencies are inferred from the claim text.