Stepping motor
First Claim
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1. A stepping motor comprising:
- a rotatable cylindrical rotor having a plurality of magnetized north poles and a plurality of magnetized south poles alternately arranged in a circumferential direction about the rotor;
a stator having a plurality of stator teeth arranged about the rotor;
coils for magnetizing the stator; and
control means for controlling excitation of the coils to control the rotation of he rotor, the control means being arranged to rotate the rotor a predetermined amount to a selected stop position and then determine whether to maintain the excitation of the coils or to relinquish the excitation of the coils based upon the relative position of he stator teeth and the rotor poles in the stop position.
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Abstract
A stepping motor comprises a rotor, a stator, coils for magnetizing the stator, and a controller for controlling the excitation of the coils to control the rotation of the rotor. The rotor is cylindrical and has a multiplicity of alternately arranged north and south poles. The stator has a plurality of stator teeth arranged about the rotor. The controller is arranged to rotate the rotor a predetermined amount to a selected stop position and then determine whether to maintain the excitation of the coils or to inhibit the excitation of the coils based upon the relative position between the stator teeth and the rotor poles in the stop position.
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Citations
14 Claims
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1. A stepping motor comprising:
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a rotatable cylindrical rotor having a plurality of magnetized north poles and a plurality of magnetized south poles alternately arranged in a circumferential direction about the rotor; a stator having a plurality of stator teeth arranged about the rotor; coils for magnetizing the stator; and control means for controlling excitation of the coils to control the rotation of he rotor, the control means being arranged to rotate the rotor a predetermined amount to a selected stop position and then determine whether to maintain the excitation of the coils or to relinquish the excitation of the coils based upon the relative position of he stator teeth and the rotor poles in the stop position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A stepping motor comprising:
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a rotatable cylindrical rotor having a plurality of magnetized north and south poles alternately arranged in a circumferential direction about the rotor; a stator journaled around the rotor, the stator including a plurality of stator teeth and a pair of magnetic poles each having the same number of associated stator teeth, the magentic poles being arranged in such a way that the stator teeth of one of the magnetic poles and those of the other magnetic pole are alternately positioned; a pair of coils wound around the stator such that exciting a first one of the coils cause a first one of the magnetic poles to be magnetized as a north pole and the second magnetic pole to be magnetized as a south pole, and exciting the second coil causes a reverse magnetation of the poles; and control means for controlling excitation of the coils to control the rotation of the rotor, the control means being arranged to rotate the rotor a predetermined amount to a selected stop position and then determined whether to maintain the excitation of the coils or to inhibit the excitation of the coils based upon the relative position between the stator teeth and the rotor poles in the stop position. - View Dependent Claims (10, 11, 12)
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13. A method of controlling a stepping motor having a rotatable cylindrical rotor having a plurality of magnetized north poles and a plurality of magnetized south poles alternately arranged in a circumferential direction about the rotor, a stator having a plurality of teeth arranged about the rotor, and coils for magnetizing the stator, the method comprising the steps of:
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rotating the rotor a predetermined amount to a selected stop position by continuous excitation of the coils; and maintaining the excitation of the coils when the stop position of the rotor is a position in which the rotor is not stable when excitation of the coils is cut off, and cutting off the excitation of the coils when the rotor is positioned such that the rotor can retain the stop position even upon cutting off of the excitation of the coils. - View Dependent Claims (14)
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Specification