GB1311775A - Control circuits for stepping motors - Google Patents
Control circuits for stepping motorsInfo
- Publication number
- GB1311775A GB1311775A GB1311775DA GB1311775A GB 1311775 A GB1311775 A GB 1311775A GB 1311775D A GB1311775D A GB 1311775DA GB 1311775 A GB1311775 A GB 1311775A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- generator
- circuit
- increase
- pulse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000007423 decrease Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P8/00—Arrangements for controlling dynamo-electric motors rotating step by step
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Stepping Motors (AREA)
Abstract
1311775 Control of stepper motors EASTMAN KODAK CO 6 July 1970 32660/70 Heading H2J A high-resolution stepper motor 10<SP>1</SP> having, e.g., two hundred drive-shaft positions, is driven by pulses from a logic circuit 20<SP>1</SP> controlled by voltage-controlled variable frequency pulse generator 22<SP>1</SP>. It is desired to run the stepper motor at as high a speed as possible without the motor getting out of step with the received pulses. This maximum speed decreases with increase of the load driven by the motor due to the increase in the time, #t, it takes for the motor to index one step in response to one pulse from the generator 22<SP>1</SP>. Accordingly, a feedback control system is provided which continuously adjusts the frequency of the generator 22<SP>1</SP> to maintain the ratio #t/T constant, where T is the time interval between the generator pulses. As shown, the feedback control system comprises a disc 141 having fifty detents 16<SP>1</SP>, the disc being driven by the motor so that for each four steps of the motor a successive detent 16<SP>1</SP> is sensed by a detector 18<SP>1</SP>. Dash-lines 151 on the disc indicate the motor shaft positions. The detector output pulse is applied to a flip-flop circuit 26<SP>1</SP> which resets the flip-flop to "01". The circuit 26<SP>1</SP> also receives a setting pulse from the generator 22<SP>1</SP> through a divide by four circuit 24<SP>1</SP> which sets the circuit to "10". During the time in which the circuit 26<SP>1</SP> is in the "01" state it applies a D.C. signal to an integrator 28<SP>1</SP> which regulates the frequency of the generator 22<SP>1</SP>. Thus, a lighter load on the motor causes an increase in motor speed and the period of the "01" state is extended to increase the voltage output level from integrator 28<SP>1</SP> and increase the generator pulse frequency. Another embodiment is described with reference to, Fig. 4 (not shown), which may selectively operate as an open of closed control loop for the motor, a photo-cell sensing the detents on the disc.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3266070 | 1970-07-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1311775A true GB1311775A (en) | 1973-03-28 |
Family
ID=10342076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1311775D Expired GB1311775A (en) | 1970-07-06 | 1970-07-06 | Control circuits for stepping motors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1311775A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120012761A1 (en) * | 2010-07-15 | 2012-01-19 | Electronics And Telecommunications Research Institute | High-power pulse-signal radiation system |
-
1970
- 1970-07-06 GB GB1311775D patent/GB1311775A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120012761A1 (en) * | 2010-07-15 | 2012-01-19 | Electronics And Telecommunications Research Institute | High-power pulse-signal radiation system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |