GB1499373A - Drive systems - Google Patents
Drive systemsInfo
- Publication number
- GB1499373A GB1499373A GB12587/75A GB1258775A GB1499373A GB 1499373 A GB1499373 A GB 1499373A GB 12587/75 A GB12587/75 A GB 12587/75A GB 1258775 A GB1258775 A GB 1258775A GB 1499373 A GB1499373 A GB 1499373A
- Authority
- GB
- United Kingdom
- Prior art keywords
- variable
- motor
- control
- electric motor
- speed
- 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
- H02P29/0016—Control of angular speed of one shaft without controlling the prime mover
- H02P29/0027—Controlling a clutch between the prime mover and the load
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Control Of Fluid Gearings (AREA)
Abstract
1499373 Control of D.C. motors LINDE AG 26 March 1975 [4 April 1974] 12587/75 Addition to 1380015 Heading H2J [Also in Division B7] A drive system particularly for a fork-lift truck comprises: a shunt-wound electric motor 22, 23 arranged to drive an output shaft 7<SP>1</SP> through an infinitely-variable transmission; current-varying means for varying the current flowing through the field winding 23 of the electric motor; and control means which controls the current-varying means in dependence on the power transmitted by the transmission in such manner that when the power transmitted reduces, the current flowing through the field winding 23 is increased and the speed of the electric motor consequently decreases. As illustrated, the infinitely-variable transmission comprises a variable-displacement hydraulic motor 7 connected by fluid lines 3, 4 with a variable-displacement hydraulic pump 2 driven through a shaft 24 by the electric motor. The current-varying means comprises a variable resistor 30 disposed in the electric line 29 leading to the field winding 23. The control means comprises control fluid lines 8, 9 connected to respective fluid lines 3, 4 and leading to a control valve 10 which connects that one of the two fluid lines 8, 9 which carries the higher pressure to a control line 14 leading to a servo-cylinder 15. A piston 32 of the servo-cylinder 15 is connected by a rod 16 to the variable resistor 30. When the pressure in fluid line 3 or 4 reduces, piston 32 is moved by biasing spring 31 so that the rod 16 reduces the resistance of the variable resistor 30. The increased electric current in the field winding 23 consequent upon the reduction in the resistance of the variable resistor 30 causes a reduction in the speed of the electric motor. A control lever 33 is operative to adjust the electric motor speed to a maximum irrespective of the load on hydraulic motor 7, for example when the motor 22 drives other powerconsuming devices, whereby operation of members 33, 34 overrides the control effect of members 15, 16, 31, 32. Members 33, 34 are also used to set the maximum desired speed of motors 7, 22, after which the motor 22 automatically controls the speed of the pump 2 whilst the transmission is adjusted to obtain a desired speed of the motor 7, whereby members 2, 7 always operate in the best efficiency range. In a further embodiment (not shown), the infinitely-variable transmission takes the form of an infinitely-variable V-belt transmission.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2416363A DE2416363A1 (en) | 1973-04-19 | 1974-04-04 | DRIVE UNIT FROM AN ELECTRIC MOTOR AND A GEARBOX |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1499373A true GB1499373A (en) | 1978-02-01 |
Family
ID=5912113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB12587/75A Expired GB1499373A (en) | 1974-04-04 | 1975-03-26 | Drive systems |
Country Status (4)
| Country | Link |
|---|---|
| ES (1) | ES436250A2 (en) |
| FR (1) | FR2266977B2 (en) |
| GB (1) | GB1499373A (en) |
| IT (1) | IT1049385B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3130701A1 (en) * | 2021-12-22 | 2023-06-23 | Poclain Hydraulics Industrie | control device and method for an electro-hydraulic transmission |
-
1975
- 1975-03-26 GB GB12587/75A patent/GB1499373A/en not_active Expired
- 1975-03-28 IT IT21792/75A patent/IT1049385B/en active
- 1975-04-03 ES ES436250A patent/ES436250A2/en not_active Expired
- 1975-04-04 FR FR7510641A patent/FR2266977B2/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2266977B2 (en) | 1979-01-19 |
| ES436250A2 (en) | 1977-03-01 |
| IT1049385B (en) | 1981-01-20 |
| FR2266977A2 (en) | 1975-10-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB1286655A (en) | Hydrostatic transmission with pressure control | |
| JPS598699B2 (en) | Hydrostatic transmission control device | |
| US3247669A (en) | Hydrostatic transmission | |
| US5121603A (en) | Device for pressure-regulated variable displacement motors with rpm-dependent set pressure compensation | |
| US4419610A (en) | Reversible regenerating electric vehicle drive | |
| GB1428162A (en) | Brueninghaus hydraulik gmbh control apparatus for controllabel hydraulic pump/motor drive | |
| GB1035821A (en) | Infinitely variable transmission | |
| GB1380015A (en) | Drive systems | |
| US2425496A (en) | Winder drive | |
| GB1206686A (en) | Hydraulic motor drive | |
| GB1376113A (en) | Hydrostatic power transmission system | |
| GB1118443A (en) | Improvements in or relating to hydrostatic transmissions | |
| GB1499373A (en) | Drive systems | |
| US3992883A (en) | Fan drive systems | |
| US3208222A (en) | Battery operated industrial truck | |
| GB1385099A (en) | Industrial fork lift truck | |
| US3358444A (en) | Power transmission | |
| US4462210A (en) | Input torque control for a variable displacement hydraulic transmission | |
| GB1294249A (en) | Load manipulators for electrically-driven vehicles | |
| GB1361861A (en) | Power controlled hydraulic drive systems | |
| US3884038A (en) | Control system for a prime mover connected to a stepless transmission | |
| EP0022104A3 (en) | A device for limiting the power output of a hydraulic assembly | |
| US3693349A (en) | Speed control for hydraulic transmission | |
| GB1374411A (en) | Hydrostatic power unit | |
| CA2288423A1 (en) | Remote drop box lubrication circuit for tractors |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |