EP0132353A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Servomotor speed control in a positioning device
Assignee: Sharp Corp
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Filing: 1984-07-13
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Granted: —
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Expires: 2004-07-13
Abstract
Abstract A servomotor speed control system includes a ROM table which stores a minimum distance suited for each motor speed. When the minimum distance corresponding to the current motor speed becomes shorter than the current distance from the current motor position to a positioning target point, the instructed speed is reduced to decelerate the servomotor rotation. In a preferred form, the unit of the distance is identical with an interval of a position indicating signal developed from a rotary encoder associated with the servomotor.
Inventors
- 👤 Akira Tamagaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 12:48
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/416; G05B2219/00; G05B2219/30; G05B2219/43; G05B2219/43004; G05B2219/43097
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
151 words
A positioning device for positioning a servomotor comprising: current position detection means associated with a servomotor for developing a detection output in response to the rotation of the servomotor; current distance detection means for determining the current distance from the current motor position to a target point in accordance with said detection output developed from said current position detection means; a ROM speed table which stores a minimum distance for each of different speed values to be instructed; read out means for reading out said minimum distance from a selected memory area in said ROM speed table corresponding to the current motor speed; comparing means for comparing said minimum distance read out by said read out means with said current distance determined by said current distance detection means; and speed control means for reducing the motor speed when said comparing means'determines that said minimum distance is shorter than said current distance.
Claim 2
Dependent Claim
151 words
A positioning device for positioning a servomotor comprising: current position detection means associated with a servomotor for developing a detection output in response to the rotation of the servomotor; current distance detection means for determining the current distance from the current motor position to a target point in accordance with said detection output developed from said current position detection means; a ROM speed table which stores a minimum distance for each of different speed values to be instructed; read out means for reading out said minimum distance from a selected memory area in said ROM speed table corresponding to the current motor speed; comparing means for comparing said minimum distance read out by said read out means with said current distance determined by said current distance detection means; and speed control means for reducing the motor speed when said comparing means'determines that said minimum distance is shorter than said current distance.
Claim 3
Dependent Claim
24 words
The positioning device for positioning a servomotor of claim 1, wherein said current position detection means includes a rotary encoder associated with said servomotor.
Claim 4
Dependent Claim
27 words
The positioning device for positioning a servomotor of claim 1, wherein said ROM speed table stores minimum distances for each of different eleven speeds of discrete values.
Claim 5
Dependent Claim
112 words
A servomotor control device which responds to a distance value indicative of the distance between the current position of an object and a target position thereof, and which is operable to look up data in a table, in order to provide a speed value used to control the speed of a servomotor so as to move the object to the target position, characterised in that the table is addressed according to the speed value so as to derive therefrom data indicative of a range of distance values for which the speed value is appropriate, and the distance valueiscompared to that data in order to determine whether the speed value should be changed.
Claim 6
Dependent Claim
112 words
A servomotor control device which responds to a distance value indicative of the distance between the current position of an object and a target position thereof, and which is operable to look up data in a table, in order to provide a speed value used to control the speed of a servomotor so as to move the object to the target position, characterised in that the table is addressed according to the speed value so as to derive therefrom data indicative of a range of distance values for which the speed value is appropriate, and the distance valueiscompared to that data in order to determine whether the speed value should be changed.
Claim 7
Dependent Claim
29 words
A device as claimed in claim 4, wherein the data stored in the table is such as to cause the object to decelerate as it approaches the target position.
Claim 8
Dependent Claim
26 words
A printer having a servomotor control device as claimed in claim 4 or claim 5, for controlling the movement of a print head of the printer.
References Cited (Backward Citations)
No citation records indexed.
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