Motor with rotational sensor
First Claim
Patent Images
1. An electric motor comprising:
- at least a first magnetic pole and a second magnetic pole;
an armature comprising a commutator rotatable relative to the first and second magnetic poles;
multiple brushes including at least a first brush and a second brush each operative to provide an electrical connection between the armature and a power source; and
a rotational sensor in fixed position relative to the multiple brushes and at least in electrical communication with the commutator, wherein the rotational sensor is operative to output a sinusoidal signal.
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Abstract
An electric motor including a rotational sensor is provided. Certain examples of the rotational sensor are operative to output a sinusoidal signal that corresponds to the rotational position of the motor armature in response to the potential at a single point or multiple points on the commutator. Certain other examples of the motor and rotational sensor disclosed here are operative to provide multiple pulses per rotation of the armature, which can allow for finer adjustment of devices attached to the motor. The motor and rotational sensor provides a simpler and less costly design requiring fewer parts subject to mechanical failure.
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Citations
43 Claims
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1. An electric motor comprising:
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at least a first magnetic pole and a second magnetic pole;
an armature comprising a commutator rotatable relative to the first and second magnetic poles;
multiple brushes including at least a first brush and a second brush each operative to provide an electrical connection between the armature and a power source; and
a rotational sensor in fixed position relative to the multiple brushes and at least in electrical communication with the commutator, wherein the rotational sensor is operative to output a sinusoidal signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An electric motor comprising:
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at least a first magnetic pole and a second magnetic pole;
an armature comprising a commutator and a rotational member, each of the commutator and rotational member being rotatable relative to the first and second magnetic poles;
multiple brushes including at least a first brush and a second brush each operative to provide an electrical connection between the armature and a power source; and
a rotational sensor in fixed position relative to the multiple brushes and at least in intermittent contact with the rotational member, wherein the rotational sensor is operative to output a signal. - View Dependent Claims (18, 19, 20, 21)
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22. A power seat assembly comprising:
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a seat base;
a seat moveably mounted on the seat base;
at least one motor operative to move the seat relative to the seat base, wherein the at least one motor comprises at least a first magnetic pole and a second magnetic pole, an armature comprising a commutator rotatable relative to the first and second magnetic poles, multiple brushes including at least a first brush and a second brush each operative to provide an electrical connection between the armature and a power source; and
a rotational sensor in fixed position relative to the multiple brushes and at least in electrical communication with the commutator, wherein the rotational sensor is operative to output a sinusoidal signal. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A vehicle power seat adjuster comprising:
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first and second spaced track assemblies, each formed of a first component movable relative to a stationary second component;
a drive motor having at least one rotatable output shaft, the drive motor comprising;
at least first and second magnetic poles, an armature comprising a commutator rotatable relative to the first and second magnetic poles, multiple brushes including at least a first brush and a second brush each operative to provide an electrical connection between the armature and a power source, and a rotational sensor in fixed position relative to the multiple brushes and at least in electrical communication with the commutator, wherein the rotational sensor is operative to output a sinusoidal signal; and
a rotatable lead screw operatively coupled to the first and second components. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40)
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41. An electric motor comprising:
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at least a first magnetic pole and a second magnetic pole in a motor housing;
an armature comprising a commutator rotatable relative to the first and second magnetic poles;
multiple brushes including at least a first brush and a second brush each operative to provide an electrical connection between the armature and a power source; and
sensing means for sensing one of motor shaft speed or a position of the motor armature to control rotational movement of a motor output shaft, wherein the sensing means is operative to output a sinusoidal signal. - View Dependent Claims (42, 43)
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Specification