Rotational position detection device for stepping motor
AssigneeDenso Corporation
InventorYasumitsu OMI
Life of this patent
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Abstract
A rotational position detection device for a stepping motor is used for a stepping motor including a rotor with a plurality of magnets arranged in an annular shape, in order to detect a rotational position of the rotor. The rotational position detection device includes a magnetic flux sensor having a detection range at a predetermined position for detecting magnetism and detecting a change in magnetism according to rotation of the rotor. The magnets are arranged so that a polarity periodically changes according to a rotational direction of the rotor. The rotor has a peculiar magnetic flux point that interferes with a periodicity of a response waveform formed by the magnetism of the magnets detected by the magnetic flux sensor in a period of time for one rotation of the rotor.
Claims8
A rotational position detection device for a stepping motor, the stepping motor including a rotor with a plurality of magnets arranged in an annular shape, the rotational position detection device configured to detect a rotational position of the rotor and comprising:
- a magnetic flux sensor having a detection range at a predetermined position for detecting magnetism and configured to detect a change in magnetism caused by rotation of the rotor, wherein
- the magnets are arranged so that a polarity changes periodically according to a rotational direction of the rotor, and
- the rotor has a peculiar magnetic flux point configured to interfere with a periodicity of a response waveform, which is formed by the magnetism of the magnets detected by the magnetic flux sensor, in a period of time for one rotation of the rotor.
Dependencies are inferred from the claim text.