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Speed control system having high and low level speed means

閱讀：230發(fā)布：2020-11-06

專利匯可以提供Speed control system having high and low level speed means專利檢索，專利查詢，專利分析的服務(wù)。并且A speed control system for a magnetic disk drive where a DC drive motor is integrally mounted on the spindle of the disk drive along with a blower fan. A feedback control loop compares the index marks from the disk unit in conjunction with a counter unit driven by a oscillator to provide a reference level to drive the drive motor between a high-level speed, above its normal speed, and a low-level speed, below its normal speed. During the start up period the motor is maintained at the high-level speed for faster cleaning action and the heads are also landed at this speed after cleaning has occurred. An open loop system also provides high-level and normal speeds.，下面是Speed control system having high and low level speed means專利的具體信息內(nèi)容。

1. A speed control system for a driven element comprising: drive motor means integrally mounted to a shaft to which a magnetic disk storage unit may be coupled for rotation, said drive motor means having a high level speed means and low level speed means; said shaft and disk unit having a predetermined normal rotational speed, said high level speed means providing a speed greater than said normal speed and said low level speed means providing a speed lower than said normal speed but greater than zero; air blower means integrally mounted on said shaft for cleansing said disk unit; means for sensing the rotational speed of said motor means; reference means providing a fixed reference level, means responsive to said sensing means for comparing said actual rotary speed with said fixed reference level such means activating said high-speed level means of said motor means in response to said actual rotary speed being below said reference level and activating said low level speed means in response to said actual rotary speed being above said reference level; logic means for initiating a start-up period and for activating said high level speed means; and means for timing said start-up period.
2. A speed control system as in claim 1 where said reference means includes a counter and an oscillator said oscillator driving said counter, said counter producing an indication of reaching a predetermined count which is said fixed referencE level, said speed sensing means providing a marker for each revolution, said comparing means including means coupling said counter to said high level and low level speed means; said coupling means being responsive to said indication of reaching said predetermined count and to a revolution marker of said speed sending means for activating said high level speed means if said indication occurs before said marker.
3. A speed control system as in claim 2 where said oscillator has a frequency of oscillation equal to said predetermined number of counts divided by the time required for one revolution of said motor means at said normal speed.
4. A speed control system as in claim 2 where coupling means include speed control means having set and reset conditions, said control means being set by said count indication and reset by said revolution marker said latch in said set condition activating said high level speed means and in said reset condition said low level speed means.
5. A speed control system as in claim 4 where said counter is reset by said revolution marker.
6. A speed control system as in claim 1 where said high level speed means produces a maximum speed at least 30 percent greater than said normal speed and said low level speed means produces a minimum speed at least 20 percent less than said normal speed.
7. A speed control system as in claim 1 where said reference means includes a counter and an oscillator said oscillator driving said counter said counter producing an indication of reaching a predetermined count which is said reference level and where said speed sensing means provides a marker for each revolution and where said means for timing said start-up period includes means for coupling said counter to said speed sensing means said indication of said predetermined count signalling the end of said start-up period.
8. A speed control system as in claim 1 together with read/write heads for said disk unit and means for landing said heads at the end of said start-up period but when said high level speed means is still activated.
9. A speed control system as in claim 1 where said motor means and said driven element have inertia and a frictional drag at said normal speed said low level speed means providing a torque for said motor means which is less than but substantially compensates for said drag to provide a deceleration characteristic which is relatively gradual with respect to the time required for one revolution at said normal speed.
10. A speed control system for a disk drive comprising: drive motor means integrally mounted to a shaft to which a magnetic disk unit may be coupled for rotation, said drive motor means having a high level speed means and low level speed means, said drive motor means and said disk unit having a predetermined normal rotational speed, said high level speed means providing a speed greater than said normal speed, said low level speed means providing a speed lower than said normal speed but greater than zero, air blower means integrally mounted on said shaft for cleansing said disk unit, means for controlling the speed of said motor means and said disk unit for selectively actuating said high and low level speed means to provide an average normal rotational speed, logic means for initiating a start-up period for activating said high level speed means and means for timing said start-up period.
11. A speed control system as in claim 10 together with read/write heads for said disk unit having a spaced position and a normal tracking position and means for moving said heads to said normal tracking position at the end of said start-up period but when said high level speed means is still activated.
12. A speed control system for a disk drive comprising: drive motor means integrally mounted to a shaft to which a magnetic disk unit may be coupled for rotation, said drive motor means having high level and normal speed means, said high level speed being greater than said normal speed, air blower meanS integrally mounted on said shaft for cleansing said disk unit, read/write heads for said disk unit having a spaced position and a normal tracking position, sequencing means for activating said high level speed means during a start-up period, for moving said heads to said normal tracking position at the end of the start-up period, and for thereafter activating said normal speed means.
13. A speed control system as in claim 12 where said motor means includes an AC type motor, a voltage controlled oscillator power source, and means included in said oscillator for causing said oscillator to selectively generate either of two predetermined frequencies corresponding to said high and normal speeds such means being responsive to said sequencing means for said frequency selection.
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