Low power disk drive spindle motor controller
First Claim
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1. A high efficiency, switching regulator type hard disk storage system comprising:
- a hard disk drive assembly including storage disks and a permanent magnet motor having a multiple phase stator;
switching circuit means electrically connecting a power source and each phase of said multiple phase stator for electrically connecting electrical power to said multiple phase stator;
a switching regulator circuit including an n-channel field effect switching transistor connected between said switching circuit means and ground; and
means for applying substantially constant high frequency pulse switching signals to said n-channel field effect switching transistor, said pulse switching signals providing a varying duty cycle to vary the power supplied from said power source to said multiple phase stator of said motor.
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Abstract
A hard disk drive digital storage system provides increased efficiency and reduced losses by using a switching regulator type power supply in which a variable duty cycle, low resistance n-channel field effect transistor is located near the ground side of the motor drive circuit. A voltage booster circuit provides higher switching voltages to the motor power phase control switching transistors.
22 Citations
20 Claims
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1. A high efficiency, switching regulator type hard disk storage system comprising:
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a hard disk drive assembly including storage disks and a permanent magnet motor having a multiple phase stator; switching circuit means electrically connecting a power source and each phase of said multiple phase stator for electrically connecting electrical power to said multiple phase stator; a switching regulator circuit including an n-channel field effect switching transistor connected between said switching circuit means and ground; and means for applying substantially constant high frequency pulse switching signals to said n-channel field effect switching transistor, said pulse switching signals providing a varying duty cycle to vary the power supplied from said power source to said multiple phase stator of said motor. - View Dependent Claims (2, 3, 4, 5, 6, 11)
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7. A high efficiency, switching regulator type hard disk storage system comprising:
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a hard disk drive assembly including storage disks and a motor having multiple phase windings; switching circuit means connected to a positive power source and to each of said multiple phase windings for supplying electrical power to said multiple phase windings; a switching regulator circuit including a high speed n-type transistor connected between said switching circuit means and ground; and means for applying high frequency pulse switching signals to said high speed n-type transistor, said pulse switching signals providing a varying duty cycle to vary the power supplied from said power source to said motor. - View Dependent Claims (8, 9, 10, 12, 13)
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14. A high efficiency, switching regulator type hard disk storage system comprising:
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a hard disk drive assembly including storage disks and a motor having multiple phase windings; a positive power source for providing electrical power to said motor; a switching circuit means connected to a positive power source and to each of said multiple phase windings for supplying electrical power to said multiple phase windings; a switching regulator circuit including a high speed, low "on " resistance transistor connected between said switching circuit means and ground; means for applying high frequency pulse switching signals to said high speed, low "on" resistance transistor, said pulse switching signals providing a varying duty cycle to vary the power supplied from said power source to said motor; a sense resistor connected between said switching regulator circuit and ground, a voltage developing across said sense resistor during operation of said motor; and means for utilizing the voltage developed across said sense resistor to control said switching circuit means. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A high efficiency, switching regular type hard disk storage system comprising:
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a hard disk drive assembly including storage disks and a motor having multiple phase windings; switching circuit means connected to a positive power source and to each of said multiple phase windings for supplying electrical power to said multiple phase windings; a switching regulator power convertor including a high speed n-type transistor connected between said switching circuit means and ground; and means for applying high frequency pulse switching signals to said high speed n-type transistor to vary the power supplied from said power source to said motor.
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Specification