Patent US5552689A successfully refreshed from Google Patents.
US5552689A
Expired / Lapsed
US
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Servo motor
Assignee: Laurel Bank Machine Co Ltd
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Filing: 1994-12-27
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Granted: 1996-09-03
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Expires: 2014-12-27
Abstract
Abstract A servo motor includes a motor, a motor driver for driving the motor by outputting pulses to the motor, and a speed detector for calculating speed information. The servo motor further includes a comparator for comparing the speed information with command speed information and calculating deviation information therebetween, a memory for storing pulse correction information for modifying a duty factor of the pulses in accordance with a rotational state of the motor, and a pulse updater for reading the pulse correction information stored in the memory based on the deviation information, modifying the duty factor of the pulses, and outputting the duty factor modified pulses to the motor driver.
Inventors
- 👤 Yasuhiko Matoba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:00
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/12; H02P6/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
116 words
A servo motor comprising a motor, a motor drive means for driving said motor by outputting pulses to said motor, and a speed detecting means for calculating speed information, said servo motor further comprising: a comparing means for comparing said speed information with command speed information and calculating deviation information therebetween, a memory means for storing pulse correction information for modifying a duty factor of said pulses in accordance with a rotational state of said motor, and a pulse updating means for reading said pulse correction information stored in said memory means based on said deviation information, modifying the duty factor of said pulses, and outputting the duty factor modified pulses to said motor drive means.
Claim 2
Dependent Claim
116 words
A servo motor comprising a motor, a motor drive means for driving said motor by outputting pulses to said motor, and a speed detecting means for calculating speed information, said servo motor further comprising: a comparing means for comparing said speed information with command speed information and calculating deviation information therebetween, a memory means for storing pulse correction information for modifying a duty factor of said pulses in accordance with a rotational state of said motor, and a pulse updating means for reading said pulse correction information stored in said memory means based on said deviation information, modifying the duty factor of said pulses, and outputting the duty factor modified pulses to said motor drive means.
Claim 3
Dependent Claim
30 words
A servo motor in accordance with claim 1, further comprising an information modifying means for modifying said pulse correction information stored in said memory means and/or said command speed information.
Claim 4
Dependent Claim
62 words
A servo motor in accordance with claim 1, wherein said speed detecting means comprises a pulse generating means for generating pulses corresponding to the rotational speed of said motor, a pulse counting means for counting a number of pulses per a predetermined time period, said predetermined time period being determined in accordance with the reference pulse information stored in said memory means.
Claim 5
Dependent Claim
62 words
A servo motor in accordance with claim 2, wherein said speed detecting means comprises a pulse generating means for generating pulses corresponding to the rotation speed of said motor, a pulse counting means for counting a number of pulses per a predetermined time period, said predetermined time period being determined in accordance with the reference pulse information stored in said memory means.
Claim 6
Dependent Claim
23 words
A servo motor in accordance with claim 3, wherein said reference pulse information includes sample period data corresponding to the predetermined time period.
Claim 7
Dependent Claim
23 words
A servo motor in accordance with claim 4, wherein said reference pulse information includes sample period data corresponding to the predetermined time period.
Claim 8
Dependent Claim
29 words
A servo motor in accordance with claim 1, wherein said pulse updating means outputs the duty factor modified pulses at a timing in accordance with said reference pulse information.
Claim 9
Dependent Claim
25 words
A servo motor in accordance with claim 7, wherein said reference pulse information includes interval data for use in outputting the duty factor modified pulses.
Claim 10
Dependent Claim
54 words
A servo motor in accordance with claim 1, wherein said speed information includes at least an on-duty period for exciting said motor, wherein said pulse correction information includes values for modifying said on-duty period, and wherein said pulse updating means changes the value of said on-duty period in accordance with one of said values.
Claim 11
Dependent Claim
29 words
A servo motor in accordance with claim 9, wherein each of said values corresponds to the value to be added to or to be subtracted from said on-duty period.
Claim 12
Dependent Claim
40 words
A servo motor in accordance with claim 10, wherein said comparing means calculates the difference between said speed information and said command speed information and selects the value closest to the difference from among said values as said deviation information.
References Cited (Backward Citations)
US4194144A
Cited
US4227150A
Cited
US4354146A
Cited
US4297009A
Cited
US4398137A
Cited
US4415844A
Cited
US4339700A
Cited
US4575667A
Cited
US4638225A
Cited
US4748555A
Cited
US4485337A
Cited
US4897778A
Cited
US4777418A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1999-09-03 | 2000-03-04 | 2000-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-03 | 2004-03-04 | 2004-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-03 | 2008-03-04 | 2008-09-03 | $7700.00 | Window Closed / Lapsed |