US3827371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear and rotary motor driving system for electric car
Assignee: Hitachi Ltd
•
Filing: 1972-09-19
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Granted: 1974-08-06
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Expires: 1992-09-19
Abstract
Abstract A driving system for an electric car comprising a linear motor, a controlled rectifier device, and a d.c. motor connected to the wheels of the car. The primary winding of the linear motor is disposed along a track for producing a mobile magnetic field, while the secondary winding thereof is disposed on the car and is connected to the controlled rectifier device which drives the d.c. motor. The controlled rectifier device is suitably controlled so that the propulsive force can be developed by the d.c. motor in a low speed range and by the linear motor in a high speed range.
Inventors
- 👤 Y Onoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:48
CPC Classifications
B; B60; B60L; B60L13/00; B60L13/03; B60L15/00; B60L15/002; B60L15/005; B60L2200/00; B60L2200/26; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
101 words
A driving system for an electric car comprising a linear motor for propelling the car including a primary winding disposed along a track on the ground to be energized by an a.c. power source and a secondary winding disposed on the car opposite to said primary winding, controllable power converting means connected to said secondary winding for providing a controllable power output, a rotary machine connected to said power converting means for being driven with the output of said power converting means, and traction wheels for the car connected to said rotary machine and being driven thereby for propelling the car.
Claim 2
Dependent Claim
101 words
A driving system for an electric car comprising a linear motor for propelling the car including a primary winding disposed along a track on the ground to be energized by an a.c. power source and a secondary winding disposed on the car opposite to said primary winding, controllable power converting means connected to said secondary winding for providing a controllable power output, a rotary machine connected to said power converting means for being driven with the output of said power converting means, and traction wheels for the car connected to said rotary machine and being driven thereby for propelling the car.
Claim 3
Dependent Claim
68 words
A driving system as claimed in claim 1, further comprising means for instructing the speed of the car, means for detecting the speed of the car, comparing means for delivering a signal representative of the difference between the instructed speed and the actual speed of the car, and means for controlling said power converting means in response to the application of the signal representative of the speed difference.
Claim 4
Dependent Claim
27 words
A driving system as claimed in claim 1, wherein said controllable power converting means is a controlled rectifier means and said rotary machine is a d.c. motor.
Claim 5
Dependent Claim
68 words
A driving system as claimed in claim 3, further comprising means for instructing the speed of the car, means for detecting the speed of the car, comparing means for delivering a signal representative of the difference between the instructed speed and the actual speed of the car, and means for controlling said controlled rectifier means in response to the application of the signal representative of the speed difference.
Claim 6
Dependent Claim
64 words
A driving system as claimed in claim 3, further comprising means for detecting the speed of the car, and field control means for weakening the field excitation of said d.c. motor in response to the increase in the actual speed of the car, the car being propelled principally by the d.c. motor at low speeds and principally by the linear motor at high speeds.
Claim 7
Dependent Claim
19 words
A driving system as claimed in claim 1, further comprising auxiliary power source means connected to said secondary winding.
Claim 8
Dependent Claim
27 words
A driving system as claimed in claim 5, further comprising auxiliary power source means connected to said secondary winding for supplying current to said field controL means.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |