EP0094492A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Multi-mode drive motor speed control for use in particular with information storage disks
Assignee: International Business Machines Corp
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Filing: 1983-03-22
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Granted: —
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Expires: 2003-03-22
Abstract
Abstract A three mode motor speed control for a device such as a magnetic disk drive requiring a closely regulated running speed provides for acceleration, deceleration, obtaining close speed regulation and maintaining speed regulation of a rotating device during operation. The first mode of control provides acceleration or deceleration while checking velocity each eighth revolution and the second mode of control uses single revolutions to measure speed over an accurate rotational distance to obtain close speed regulation. Both mode one and mode two are controlled by the device controller. During run conditions with no error signal, a third mode of control of the closely regulated velocity is maintained by separate hardware circuits which frees the processor for other uses. An error condition forces control to mode one for re-establishment of the regulated running speed and a command to stop the drive forces control to level one for deceleration and stop procedures.
Inventors
- 👤 David Whinery Collins
- 👤 John Jacob Neesz
- 👤 Michael Charles Stich
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 15:02
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/64; G01P3/66; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/489; G11; G11B; G11B19/00; G11B19/20; G11B19/28; H; H02; H02P; H02P23/00; H02P23/18; H02P23/186
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
278 words
A motor drive control for regulating the speed of a rotating driven device connected to the motor characterized in that it comprises: first, second and third modes of device speed control; said first mode of device speed control including: the use of a first sequence of feedback signals associated with said driven device, means for applying power to said motor to effect acceleration of said motor, first means for determining the velocity of said driven device, and first switch means for transferring from said first level of speed control to said second level of speed control upon said driven device attaining a predetermined velocity; said second mode of device speed control including: the use of a second sequence of feedback signals associated with said driven device, speed regulating means connected to receive signals from said second source for varying the power to said motor, second switch means for transferring from said second mode of speed control to said third mode of speed control, and first sensing means for actuating said second switch means when said speed regulating means is maintaining the speed of said driven device within a predetermined speed regulation range; and said third mode of driven device speed control including: second velocity determining means that senses velocity over a plurality of time periods during each device revolution and senses velocity information during each revolution occurring with a greater frequency and accur- aty than signals from either said first,and said second modes of speed control and means connected to receive signals from said second velocity determining means controlling the power supplied to said motor in response to driven device velocity sensed by said second velocity determining means.
Claim 2
Dependent Claim
278 words
A motor drive control for regulating the speed of a rotating driven device connected to the motor characterized in that it comprises: first, second and third modes of device speed control; said first mode of device speed control including: the use of a first sequence of feedback signals associated with said driven device, means for applying power to said motor to effect acceleration of said motor, first means for determining the velocity of said driven device, and first switch means for transferring from said first level of speed control to said second level of speed control upon said driven device attaining a predetermined velocity; said second mode of device speed control including: the use of a second sequence of feedback signals associated with said driven device, speed regulating means connected to receive signals from said second source for varying the power to said motor, second switch means for transferring from said second mode of speed control to said third mode of speed control, and first sensing means for actuating said second switch means when said speed regulating means is maintaining the speed of said driven device within a predetermined speed regulation range; and said third mode of driven device speed control including: second velocity determining means that senses velocity over a plurality of time periods during each device revolution and senses velocity information during each revolution occurring with a greater frequency and accur- aty than signals from either said first,and said second modes of speed control and means connected to receive signals from said second velocity determining means controlling the power supplied to said motor in response to driven device velocity sensed by said second velocity determining means.
Claim 3
Dependent Claim
62 words
The motor drive control of Claim 1 for regulating the speed of a driven device connected to the motor, characterized in that : said sequence of feedback signals is generated by a plurality of substantially equal angular displacement of said rotating, driven device per revolution, and , said second sequence of feedback signals consists of one signal per revolution of said device.
Claim 4
Dependent Claim
59 words
The motor drive control of Claim 2 for regulating the speed of a driven device connected to the motor, characterized in that it : further comprises second sensing means for transferring said speed control from said third mode to said first mode when the velocity sensed by said second velocity determining means falls beyond a predetermined range of values.
Claim 5
Dependent Claim
104 words
A motor drive control for regulating the speed of a rotating information carrying media connected to the motor for use with an information storage device including a motor for driving a rotating media and a processor unit, characterized in that it comprises : first means for accelerating said information handling media to an operating speed and effecting rotational speed regulation within a predetermined range under control of said processor unit, and digital circuit means for maintaining said rotating information carrying media speed within a predetermined range of rotational velocities, whereby said processor unit is freed to handle non-motor related matters during no error operation.
Claim 6
Dependent Claim
104 words
A motor drive control for regulating the speed of a rotating information carrying media connected to the motor for use with an information storage device including a motor for driving a rotating media and a processor unit, characterized in that it comprises : first means for accelerating said information handling media to an operating speed and effecting rotational speed regulation within a predetermined range under control of said processor unit, and digital circuit means for maintaining said rotating information carrying media speed within a predetermined range of rotational velocities, whereby said processor unit is freed to handle non-motor related matters during no error operation.
Claim 7
Dependent Claim
43 words
The information storage device of Claim 4 characterized in that said motor drive control further comprises sensing means for transferring motor drive control to said first means when an error condition occurs with respect to speed regulation effected by said digital circuit means.
Claim 8
Dependent Claim
87 words
The information storage device of Claim 5 characterized in that said data is stored on concentric tracks divided into sectors each of which includes a pre-recorded pattern wherein said digital circuit means comprises counter means for generating a count between sector patterns; decode means responsive to said count generated between sector patterns; and output means that is actuated when said decode means determines that the rotational velocity of said rotating media is less than a predetermined value during the passage of the sector represented by said count.
Claim 9
Dependent Claim
109 words
The information storage device of Claim 6 characterized in that said first means includes a first operating mode wherein speed is measured by counting means within said processor unit a plurality of times during each revolution of said rotating media until a predetermined speed is attained; and a second operating mode wherein rotational speed is determined by sensing rotation of said rotating media once per revolution until a predetermined range of speed regulation is achieved and further comprising switching means for transferring control of said motor from said first means to said digital circuit means when said predetermined range of speed regulation is achieved by said second operating mode.
Claim 10
Dependent Claim
60 words
The information storage device of Claim 7 characterized in that it further comprises : error sensing means associated with said processor unit for sensing an error condition related to the rotating media speed regulation effected by said digital circuit means and for transferring control of said motor to said first means first operating mode when an error condition is sensed.
Claim 11
Dependent Claim
88 words
The information storage device of Claim 7 wherein said first means second operating mode includes speed regulation means comprising a first motor duty cycle and a second motor duty cycle of longer duration than said first motor duty cycle and selection means for selecting said first motor duty cycle when the rotational velocity of said rotating media during one rotation exceeds a predetermined value and for selecting said second duty cycle when the rotational velocity of said rotating media during one revolution does not exceed said predetermined value.
Claim 12
Dependent Claim
27 words
The information storage device of Claim 9 characterized in that said second motor duty cycle is at least twice the duration of said first motor duty cycle.
References Cited (Backward Citations)
No citation records indexed.
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