Controlling circuit for actuator
First Claim
1. A controlling circuit for an actuator which is provided with a rotating shaft to be stopped in each of a plurality of rotational positions, a rotor which is connected to said rotating shaft and in which the even number of magnetic poles of permanent magnet are arranged with equal interval, and a stator which is arranged to be positioned around said rotor and in which electro-magnets whose number is one and half times of the number of magnet poles of said permanent magnet are arranged with equal interval, comprising:
- a change-over switch having a plurality of switching elements each of which corresponds to each of rotational position for designating each of rotational positions of said rotating shaft by selecting each of said switching element; and
a plurality of exciting circuit forming means each of which is connected to each said switching element, respectively, and which forms an exciting circuit so that said plurality of electro-magnets is selectively magnetized in order to rotate said rotating shaft to be in a designated rotational position by connecting each of switching elements to a power source,wherein said each exciting circuit forming means comprises electrifying switching means for forming said exciting circuit for a predetermined duration from the time when switching elements to which each of themselves is connected have been connected to a power source.
1 Assignment
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Accused Products
Abstract
A controlling circuit for an actuator which is provided with a change-over switch for selecting a desired rotational position of a rotating shaft of the actuator, exciting circuit forming device for selectively magnetizing a plurality of electro-magnets in order to control rotation of the rotating shaft to be in a selected desired rotational position in response to an outputted change-over signal, and electrifying switching device for supplying electricity to the electro-magnets only for a predetermined duration from the time when selection of the rotational position of the rotating shaft is changed over by the change-over switch, wherein there is no generated any unnecessary heat for the actuator and construction of the circuit can be more simplified.
22 Citations
10 Claims
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1. A controlling circuit for an actuator which is provided with a rotating shaft to be stopped in each of a plurality of rotational positions, a rotor which is connected to said rotating shaft and in which the even number of magnetic poles of permanent magnet are arranged with equal interval, and a stator which is arranged to be positioned around said rotor and in which electro-magnets whose number is one and half times of the number of magnet poles of said permanent magnet are arranged with equal interval, comprising:
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a change-over switch having a plurality of switching elements each of which corresponds to each of rotational position for designating each of rotational positions of said rotating shaft by selecting each of said switching element; and a plurality of exciting circuit forming means each of which is connected to each said switching element, respectively, and which forms an exciting circuit so that said plurality of electro-magnets is selectively magnetized in order to rotate said rotating shaft to be in a designated rotational position by connecting each of switching elements to a power source, wherein said each exciting circuit forming means comprises electrifying switching means for forming said exciting circuit for a predetermined duration from the time when switching elements to which each of themselves is connected have been connected to a power source. - View Dependent Claims (2, 3, 4, 5)
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6. A controlling circuit of an actuator for a shock absorber which is provided with a rotating shaft being connected to a change-over shaft for changing-over oil passage area among a plurality of steps in order to vary a damping force of the shock absorber and to be stopped in each of a plurality of rotational positions, a rotor which is connected to said rotating shaft and in which the even number of magnetic poles of permanent magnet are arranged with equal interval, and a stator which is arranged to be positioned around said rotor and in which electro-magnets whose number is one and half times of the number of magnet poles of said permanent magnet are arranged with equal interval, comprising:
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a change-over switch having a plurality of switching elements each of which corresponds to each of rotational position for designating each of rotational positions of said rotating shaft by selecting each of said switching element; and a plurality of exciting circuit forming means each of which is connected to each said switching element, respectively, and which forms an exciting circuit so that said plurality of electro-magnets is selectively magnetized in order to rotate said rotating shaft to be in a designated rotational position by connecting each of switching elements to a power source, wherein said each exciting circuit forming means comprises electrifying switching means for forming said exciting circuit for a predetermined duration from the time when switching elements to which each of themselves is connected have been connected to a power source. - View Dependent Claims (7, 8, 9, 10)
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Specification