Motor rotation controlling device
First Claim
1. A rotation controlling device for controlling a rotation speed of a motor comprising:
- a rotation detecting means for detecting a rotation speed of a motor,a signal processing means for generating a control signal for constantly controlling said motor rotation speed in response to the rotation speed detected by said rotation detecting means;
a comb-shaped filter means for removing a rotation period component and its harmonic component included in a control signal supplied from said signal processing means;
a control means for varying a transfer function of said comb-shaped filter means at a transient response and a normal response according to said motor rotation speed;
a driving means for driving said motor in response to said filtered control signal supplied from said comb-shaped filter means; and
a limit means connected between said signal processing means and said comb-shaped filter means, for limiting the level of said control signal, wherein said limit means comprises;
an upper limit value generating means for generating an upper limit value;
a first comparing means for comparing a control signal supplied from said signal processing means with an upper limit value supplied from said upper limit value generating means;
a first switching means for switching a control signal supplied from said signal processing means and an upper limit value supplied from said upper limit value generating means according to a logic state of a comparing signal supplied from said first comparing means;
a lower limit value generating means for generating a lower limit value;
a second switching means for switching an output of said first switching means and a lower limit value supplied from said lower limit value generating means to said comb-shaped filter means; and
a second controlling means for making said second switching means select a lower limit value while a predetermined logic state of a comparing signal generated in said first comparing means exceeds a first predetermined interval.
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Accused Products
Abstract
A motor rotation controlling device, usable for example in a video recorder, to minimize transient phenomena at an initial operation and shorten a transient response time for detecting a rotation speed of a motor, a signal processor for constantly controlling rotation speed of the motor by the detected rotation speed supplied from the rotation detector, a comb-shaped filter for removing a rotation period component and its harmonic component included in a control signal supplied from the signal processor, a controller for varying a transfer function of the comb-shaped filter at a transient response time and a normal time according to the rotation speed of the motor, a driving device for driving a motor by the filtered control signal supplied from the comb-shaped filter, and a limit device connected between the signal processing means and the comb-shaped filter for clamping the control signal.
79 Citations
18 Claims
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1. A rotation controlling device for controlling a rotation speed of a motor comprising:
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a rotation detecting means for detecting a rotation speed of a motor, a signal processing means for generating a control signal for constantly controlling said motor rotation speed in response to the rotation speed detected by said rotation detecting means; a comb-shaped filter means for removing a rotation period component and its harmonic component included in a control signal supplied from said signal processing means; a control means for varying a transfer function of said comb-shaped filter means at a transient response and a normal response according to said motor rotation speed; a driving means for driving said motor in response to said filtered control signal supplied from said comb-shaped filter means; and a limit means connected between said signal processing means and said comb-shaped filter means, for limiting the level of said control signal, wherein said limit means comprises; an upper limit value generating means for generating an upper limit value; a first comparing means for comparing a control signal supplied from said signal processing means with an upper limit value supplied from said upper limit value generating means; a first switching means for switching a control signal supplied from said signal processing means and an upper limit value supplied from said upper limit value generating means according to a logic state of a comparing signal supplied from said first comparing means; a lower limit value generating means for generating a lower limit value; a second switching means for switching an output of said first switching means and a lower limit value supplied from said lower limit value generating means to said comb-shaped filter means; and a second controlling means for making said second switching means select a lower limit value while a predetermined logic state of a comparing signal generated in said first comparing means exceeds a first predetermined interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 12)
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10. A rotation controlling device for controlling a rotation speed of a motor comprising:
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a rotation detecting means for detecting a rotation speed of a motor; a signal processing means for generating a control signal for constantly controlling said motor rotation speed in response to the rotation speed detected by said rotation detecting means; a comb-shaped filter means for removing a rotation period component and its harmonic component included in a control signal supplied from said signal processing means; a control means for varying a transfer function of said comb-shaped filter means at a transient response and a normal response according to said motor rotation speed; a driving means for driving said motor in response to said filtered control signal supplied from said comb-shaped filter means; and a limit means connected between said signal processing means and said comb-shaped filter means, for limiting the level of said control signal, wherein said limit means comprises; a first upper limit value generating means for generating a first upper limit value; a second upper limit value generating means for generating a second upper limit value; a first lower limit value generating means for generating a first lower limit value; a second lower limit value generating means for generating a second lower limit value; a first comparing means for comparing a first upper limit value supplied from said first upper limit value generating means with a control signal supplied from said signal processing means; a second comparing means for comparing a first lower limit value supplied from said first lower limit value generating means with a control signal supplied from said signal processing means; a first switching means for switching a control signal supplied from said signal processing means and a first upper limit value supplied from said first upper limit value generating means and a first lower limit value supplied from said first lower limit value generating means according to logic values of comparing signals supplied from said first and second comparing means; a first count means for counting the interval for a comparing signal generated in said first comparing means to keep a predetermined logic state and generating a carry signal when the counted value exceeds a predetermined value; a second count means for counting the interval for a comparing signal generated in said second comparing means to keep a predetermined logic state and generating a carry signal when the counted value exceeds a predetermined value; a gate means for timing said counter according to logic values of comparing signals supplied from said first and second comparing means; and a second switching means for switching a second upper limit value supplied from said second upper limit value generating means, a second lower limit value supplied from said second lower limit value generating means and an output of said first switching means to said comb-shaped filter means, according a logic value of carry signals supplied from said first and second count means and an output of said gate means. - View Dependent Claims (11)
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13. A rotation controlling device for controlling a rotation speed of a motor comprising:
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a rotation detecting means for detecting a rotation speed of a motor; a signal processing means for generating a control signal for constantly controlling said motor rotation speed in response to the rotation speed detected by said rotation detecting means; a comb-shaped filter means for removing a rotation period component and its harmonic component included in a control signal supplied from said signal processing means; a control means for varying a transfer function of said comb-shaped filter means at a transient response and a normal response according to said motor rotation speed; a driving means for driving said motor in response to said filtered control signal supplied from said comb-shaped filter means; and a limit means connected between said comb-shaped filter and said driving means, for limiting the level of said control signal, wherein said limit means comprises; an upper limit value generating means for generating an upper limit value; a first comparing means for comparing a control signal supplied from said signal processing means with an upper limit value supplied from said upper limit value generating means; a first switching means for switching a control signal supplied from said signal processing means and an upper limit value supplied from said upper limit value generating means according to a logic state of a comparing signal supplied from said first comparing means; a lower limit value generating means for generating a lower limit value; a second switching means for switching an output of said first switching means and a lower limit value supplied from said lower limit value generating means to said comb-shaped filter means; and a second controlling means for making said second switching means select a lower limit value while a predetermined logic state of a comparing signal generated in said first comparing means exceeds a first predetermined interval.
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14. A rotation controlling device for controlling a speed of a drum motor in a video cassette recorder comprising:
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a rotation detecting means comprising a frequency generator head and a phase generator head, said frequency generator head detecting an angular speed of said drum motor and said phase generator head detecting a rotation phase of said drum motor; a first signal processing means for generating speed control data for constantly controlling a rotation speed of said drum motor in response to the angular speed detected by said frequency generator speed; a comb-shaped filter means for removing a rotation period component and its harmonic component included in said first control data supplied from said first signal processing means; a control means for varying a transfer function of said comb-shaped filter means at an initial operation and a normal operation, according to a rotation speed of said drum motor; a limit means connected between said comb-shaped filter means and said signal processing means, for limiting said speed control data; a second signal processing means for generating phase control data for constantly controlling a rotation phase of said drum motor by said detected rotation phase supplied from said phase generator head; an addition means for adding said speed control data and phase control data supplied from said comb-shaped filter means; and a means for driving said drum motor according to a motor control signal supplied from said digital-analog converting means, wherein said limit means comprises; an upper limit value generating means for generating an upper limit value; a first comparing means for comparing a control signal supplied from said signal processing means with an upper limit value supplied from said upper limit value generating means; a first switching means for switching a control signal supplied from said signal processing means and an upper limit value supplied from said upper limit value generating means according to a logic state of a comparing signal supplied from said first comparing means; a lower limit value generating means for generating a lower limit value; a second switching means for switching an output of said first switching means and a lower limit value supplied from said lower limit value generating means to said comb-shaped filter means; and a second controlling means for making said second switching means select a lower limit value while a predetermined logic state of a comparing signal generated in said first comparing means exceeds a first predetermined interval. - View Dependent Claims (15, 16, 17, 18)
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Specification