GB1270701A - Drive circuit for a d.c. motor - Google Patents
Drive circuit for a d.c. motorInfo
- Publication number
- GB1270701A GB1270701A GB2024069A GB2024069A GB1270701A GB 1270701 A GB1270701 A GB 1270701A GB 2024069 A GB2024069 A GB 2024069A GB 2024069 A GB2024069 A GB 2024069A GB 1270701 A GB1270701 A GB 1270701A
- Authority
- GB
- United Kingdom
- Prior art keywords
- supply
- speed
- motor
- armature
- relays
- 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
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
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/26—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using discharge tubes
Abstract
1,270,701. Control of D.C. motors. A. K. LITTWIN. 21 April, 1969 [1 May, 1968], No. 20240/69. Heading H2J. While a D.C. motor is dynamically braked from a high speed to a lower speed the supply is disconnected (to protect supply rectifiers from overvoltage); braking is terminated, and the supply re-connected, by means sensitive to the armature voltage during braking. The motor is a compound machine and the reduced speed is obtained by short circuiting a rheostat in series with the shunt field. A complete sequence of full speed-slow speed-full speed again is effected by programmed relays, and the means sensitive to the armature voltage comprises a relay winding connected across the armature and which is in opposition to another winding connected across the supply. While braking is taking place the supply is held disconnected by relays controlled by an electronic valve which is switched by the voltage on a chain of resistors across the armature. During acceleration a second valve is controlled by further resistors responsive to the motor current; if this becomes excessive the valve operates relays which short circuit the shunt field rheostat. This is thus inserted intermittently until full speed is reached. The circuit diagram (not shown) has many elements not relevant to the invention; they concern the operation of a grinding machine, which the motor drives, to grind and dress threads, but this is not fully described.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US72569868A | 1968-05-01 | 1968-05-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1270701A true GB1270701A (en) | 1972-04-12 |
Family
ID=24915614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2024069A Expired GB1270701A (en) | 1968-05-01 | 1969-04-21 | Drive circuit for a d.c. motor |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA983993A (en) |
| GB (1) | GB1270701A (en) |
| LU (1) | LU58529A1 (en) |
-
1969
- 1969-04-21 GB GB2024069A patent/GB1270701A/en not_active Expired
- 1969-04-28 CA CA049,980A patent/CA983993A/en not_active Expired
- 1969-04-29 LU LU58529D patent/LU58529A1/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CA983993A (en) | 1976-02-17 |
| LU58529A1 (en) | 1969-07-29 |
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