DC motor rotation information detecting device
First Claim
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1. A DC motor rotation information detecting device for detecting rotation information, comprising:
- a detection circuit that detects a surge component waveform superimposed on a signal waveform of at least one of a current flowing through a DC brush motor and a voltage between the terminals of the motor; and
a control circuit that controls the current flowing through the motor in a period from when the motor starts braking operation to when the motor stops to be equal to or greater than a reference current value set as a lower limit,wherein the control circuit controls the current by pulse width modulation.
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Abstract
A rotation information detection device detects rotation information of a DC motor based on a surge component waveform superimposed on a voltage waveform between the terminals of the DC motor or a current waveform of the DC motor, a circuit is provided which supplies a current of a current value Ipwm 45% during motor forward rotation or Ipwm 55% during reverse motor rotation to the motor over the period from when the motor starts braking operation to when it stops.
75 Citations
14 Claims
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1. A DC motor rotation information detecting device for detecting rotation information, comprising:
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a detection circuit that detects a surge component waveform superimposed on a signal waveform of at least one of a current flowing through a DC brush motor and a voltage between the terminals of the motor; and a control circuit that controls the current flowing through the motor in a period from when the motor starts braking operation to when the motor stops to be equal to or greater than a reference current value set as a lower limit, wherein the control circuit controls the current by pulse width modulation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A DC motor rotation information detecting device for detecting rotation information, comprising:
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a detection circuit that detects a surge component waveform superimposed on a signal waveform of a voltage between the terminals of a DC brush motor; and a control circuit that provides a section in which an impedance between the terminals of the motor is increased, as a detection region of the surge component waveform is superimposed on the signal waveform, wherein the control circuit provides the section cyclically through control of a current flowing through the motor by pulse width modulation. - View Dependent Claims (9, 10, 11)
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12. A DC motor rotation information detecting device for detecting rotation information, comprising:
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a detection circuit that detects a surge component waveform superimposed on a signal waveform of at least one of a current flowing through a DC brush motor and a voltage between the terminals of the motor; and a control circuit that provides a section in which impedance between the terminals of the motor is increased as a detection region of the surge component waveform superimposed on the signal waveform; a rotation signal extraction circuit that extracts the surge component waveform from the signal waveform; a rotation pulse generation circuit that generates a pulse signal by binarizing the surge component waveform extracted by the rotation signal extraction circuit based on a predetermined threshold value; and a re-triggerable one-shot circuit that forms a pulse signal corresponding to a pulse width set re-triggerable in advance, wherein a pulse width set in the one-shot circuit is variable according to a rotation speed of the motor and wherein the pulse signal generated by the rotation pulse generation circuit is used as a trigger. - View Dependent Claims (13, 14)
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Specification