Control apparatus for intermittently driving actuator, powder feeder and servo system utilizing thereof
First Claim
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1. A control apparatus for intermittently driving an actuator by applying a driving voltage to the actuator, the control apparatus comprising:
- timing clock pulse product means for producing a clock pulse with a duty ratio;
voltage application means for applying the driving voltage to the actuator according to the duty ratio;
sensor means for detecting change amount of the actuator as a voltage value;
sampling means for sampling the voltage value detected by the sensor means after a predetermined time is elapsed since the actuator stops or starts to be driven; and
control means for controlling the duty ratio on the basis of voltage value sampled by the sampling means.
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Abstract
Disclosed is the powder feeder in which the sampling timing G, H, . . . is set during the inactive period Ti in synchronism with the cycle of the duty ratio clock when the output voltage VCELL is fed back to the microcomputer 13, thereby the feedback signal (the output voltage VCELL) on which noise is not superposed can be sampled and the feed amount of the powder P can be controlled with high accuracy.
18 Citations
23 Claims
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1. A control apparatus for intermittently driving an actuator by applying a driving voltage to the actuator, the control apparatus comprising:
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timing clock pulse product means for producing a clock pulse with a duty ratio; voltage application means for applying the driving voltage to the actuator according to the duty ratio; sensor means for detecting change amount of the actuator as a voltage value; sampling means for sampling the voltage value detected by the sensor means after a predetermined time is elapsed since the actuator stops or starts to be driven; and control means for controlling the duty ratio on the basis of voltage value sampled by the sampling means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A powder feeder for intermittently driving a vibrator having a piezoelectric element by applying a driving voltage with a predetermined resonance frequency to the piezoelectric element, the powder feeder comprising:
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timing clock pulse product means for producing a clock pulse with a duty ratio; voltage application means for applying the driving voltage to the piezoelectric element according to the duty ratio; a powder feed pipe attached to a top end of the vibrator; a powder storing hopper for feeding the powder to the powder feed pipe; weight sensor means for detecting a weight of the powder in the powder storing hopper as a voltage value; sampling means for sampling the voltage value detected by the weight sensor means after a predetermined time is elapsed since the piezoelectric element stops to be driven; and control means for controlling the duty ratio on the basis of voltage value sampled by the sampling means. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A servo system for intermittently driving a motor by applying a driving voltage to the motor, the servo system comprising:
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pulse width modulating means for producing a clock pulse with a duty ratio and for applying the driving voltage to the motor according to the duty ratio; first sensor means for detecting a voltage in the motor as a voltage value; second sensor means for detecting an onset edge of the clock pulse; delay means for delaying an output signal from the second sensor means for a predetermined time; sampling means for sampling the voltage value detected by the first sensor means on the basis of the output signal delayed by the delay means; and control means for controlling the duty ratio on the basis of voltage value sampled by the sampling means. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification