GB1088444A - Means for controlling an electric motor - Google Patents
Means for controlling an electric motorInfo
- Publication number
- GB1088444A GB1088444A GB29595/65A GB2959565A GB1088444A GB 1088444 A GB1088444 A GB 1088444A GB 29595/65 A GB29595/65 A GB 29595/65A GB 2959565 A GB2959565 A GB 2959565A GB 1088444 A GB1088444 A GB 1088444A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulses
- motor
- current
- speed
- transistor
- 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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/40—Regulating or controlling the amount of current drawn or delivered by the motor for controlling the mechanical load
Abstract
1,088,444. Control of D.C. motors. SEVCON ENGINEERING Ltd. Aug. 5, 1966 [July 13, 1965], No. 29595/65. Heading H2J. [Also in Division G3] A series or compound motor M driving, e.g. an hydraulic pump in a fork-lift truck, is energized from a battery in pulses, the mark/ space ratio of which is controlled by an evaluation of load current so as to produce substantially constant torque at variable speed. A thyristor SCR1 is triggered on for constant time periods by a transistor relaxation oscillator circuit; the interval between pulses is determined by the charging of a capacitor Cl by a Zener voltage ZX1 and is increased when a transistor Tr2 is conducting, due to current through a freewheeling diode D8 shunting the motor. Thus, when the motor is pumping to move a ram its speed is high and the current through the diode decays rapidly, causing frequent pulses, but when the pump is merely maintaining a static pressure motor speed is low and the pulses are greatly spaced apart. It is mentioned that the load signal may alternatively be derived from an oil pressure transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB29595/65A GB1088444A (en) | 1965-07-13 | 1965-07-13 | Means for controlling an electric motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB29595/65A GB1088444A (en) | 1965-07-13 | 1965-07-13 | Means for controlling an electric motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1088444A true GB1088444A (en) | 1967-10-25 |
Family
ID=10294025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB29595/65A Expired GB1088444A (en) | 1965-07-13 | 1965-07-13 | Means for controlling an electric motor |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1088444A (en) |
-
1965
- 1965-07-13 GB GB29595/65A patent/GB1088444A/en not_active Expired
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