Drive control device for direct current motor
First Claim
1. A drive control device for a direct current motor having plural coils and rotationally driven by selectively switching a phase of the coils in which electricity is flowing, for controlling an amount of electricity applied to the coil in the phase by connecting a first terminal of the coil in the phase to a first pole of a direct current source and by connecting a second terminal of the coil in the phase for a duration of a period corresponding to an on-duty cycle of a predetermined pulse width modulation period of the phase, the drive control device comprising a braking means for setting a brake condition to the motor by short-circuiting the coils by connecting another coil in a phase in which electricity is not flowing to the first pole of the direct current source.
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Accused Products
Abstract
A direct current motor has plural coils and is rotationally driven by selectively switching a phase of the coils in which electricity is flowing. The drive control device for the direct current motor controls an amount of electricity applied to the coil in the phase by connecting a first terminal of the coil in the phase to a first pole of a direct current source and by connecting a second terminal of the coil in the phase for a duration of a period corresponding to an on-duty cycle of a predetermined pulse width modulation period of the phase. The drive control device has a braking means for setting a brake condition to the motor by short-circuiting the coils by connecting another coil in a phase in which electricity is not flowing to the first pole of the direct current source.
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Citations
10 Claims
- 1. A drive control device for a direct current motor having plural coils and rotationally driven by selectively switching a phase of the coils in which electricity is flowing, for controlling an amount of electricity applied to the coil in the phase by connecting a first terminal of the coil in the phase to a first pole of a direct current source and by connecting a second terminal of the coil in the phase for a duration of a period corresponding to an on-duty cycle of a predetermined pulse width modulation period of the phase, the drive control device comprising a braking means for setting a brake condition to the motor by short-circuiting the coils by connecting another coil in a phase in which electricity is not flowing to the first pole of the direct current source.
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3. A drive control device for a direct current motor, comprising:
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a detecting means for detecting a rotational position of a rotor, a calculating means for calculating a duration of a period of an on-duty cycle of a predetermined pulse width modulation period so as to ensure that the detected rotational position matches a target rotational position, a switching means for switching a connection between plural coils and a first pole and a second pole of a direct current source, and a controlling means for outputting control signals to the switching means, for rotating the rotor by selectively switching a phase of the coils in which electricity is flowing, and by connecting a first terminal of the coil in the phase to a first pole of the direct current source and by connecting a second terminal of the coil in the phase to a second pole of the direct current source for a duration of the period corresponding to the calculated on-duty cycle of the predetermined pulse-width modulation period set for the phase of the coil, the control means outputting the control signals for setting brake condition of the motor by short-circuiting the coils by connecting the coil in a phase in which electricity is not flowing to the first pole of the direct current source.
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- 4. A drive control device for a direct current motor having plural coils and rotationally driven by selectively switching a phase of the coils in which electricity is flowing in accordance with a drive condition of the motor, for connecting a first terminal of the coil in the phase to a first pole of a direct current source and for connecting a second terminal of the coil in the phase to a second pole of the direct current source by a switching means to control the connection between the coil in the phase and the first pole and the second pole of the direct current source.
Specification