US4262239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo motor apparatus
Assignee: Ricoh Co Ltd
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Filing: 1978-10-13
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Granted: 1981-04-14
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Expires: 1998-10-13
Abstract
Abstract A theoretically optimum motor drive time period or drive pulse width is computed as a function of the number of steps from the present motor shaft step to the desired command step. A compensation time period is computed as a function of a previous motor drive time period and combined with the computed drive time period to produce a present drive time period for energization of the motor (12) for movement of the motor shaft (14) from the present step to the next step.
Inventors
- 👤 Ryuichi Kawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:07
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/414; G05B19/4142; G05B2219/00; G05B2219/30; G05B2219/41; G05B2219/41176; G05B2219/42; G05B2219/42171; G05B2219/43; G05B2219/43006
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
158 words
A servo motor apparatus including a servo motor, input means for indicating a number of steps from a present motor shaft step to a command motor shaft step, first computing means for computing a computed drive time period for energization of the motor for movement from the present motor shaft step to a next motor shaft step as a first predetermined function of the number of steps and drive means for energizing the motor for a present drive time period, characterized by comprising: second computing means for computing a compensation time period as a second predetermined function of a previous drive time period; and third computing means for combining the computed drive time period with the compensation time period in accordance with a third predetermined function to produce the present drive time period; the previous drive time period corresponding to a difference between a command motor shaft speed and an actual motor shaft speed for a previous step.
Claim 2
Dependent Claim
158 words
A servo motor apparatus including a servo motor, input means for indicating a number of steps from a present motor shaft step to a command motor shaft step, first computing means for computing a computed drive time period for energization of the motor for movement from the present motor shaft step to a next motor shaft step as a first predetermined function of the number of steps and drive means for energizing the motor for a present drive time period, characterized by comprising: second computing means for computing a compensation time period as a second predetermined function of a previous drive time period; and third computing means for combining the computed drive time period with the compensation time period in accordance with a third predetermined function to produce the present drive time period; the previous drive time period corresponding to a difference between a command motor shaft speed and an actual motor shaft speed for a previous step.
Claim 3
Dependent Claim
14 words
An apparatus as in claim 1, in which the second predetermined function comprises multiplication.
Claim 4
Dependent Claim
15 words
An apparatus as in claim 1, in which the third predetermined function comprises algebraic addition.
Claim 5
Dependent Claim
15 words
An apparatus as in claim 1, in which the second predetermined function comprises sign changing.
Claim 6
Dependent Claim
16 words
An apparatus as in claim 1, in which the second computing means comprises a read-only memory.
Claim 7
Dependent Claim
28 words
An apparatus as in claim 1, in which the previous drive time period corresponds to movement from a preceding motor shaft step to the present motor shaft step.
Claim 8
Dependent Claim
38 words
An apparatus as in claim 1, in which the drive means is operative to energize the motor for shaft rotation in either direction, the first, second and third computing means being constructed to indicate respective directions of rotation.
Claim 9
Dependent Claim
17 words
An apparatus as in claim 1, further comprising storage means for storing the previous drive time period.
Claim 10
Dependent Claim
14 words
An apparatus as in claim 8, in which the storage means comprises a register.
Claim 11
Dependent Claim
25 words
An apparatus as in claim 8, in which the storage means comprises delay means for temporarily storing the previous drive time period during passage therethrough.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |