US3560820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reluctance motor power circuit containing series capacitance
Assignee: Ford Motor Co
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Filing: 1969-02-03
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Granted: 1971-02-02
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Expires: 1989-02-03
Abstract
Abstract A commutating capacitor is coupled in series with a DC battery and the winding of a reluctance-type motor. In series with the capacitor is a circuit consisting of an SCR in parallel with a reverse biased diode or a second SCR. An SCR is coupled in parallel with the winding to freewheel winding current. Another SCR in series with an inductor can be coupled in parallel with the capacitor to reverse the capacitor charge.
Inventors
- 👤 Lewis E Unnewehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:56
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02K19/00; H02K19/02; H02K19/10; H02K19/103
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
134 words
In a reluctance motor having a motor winding that has a varying inductance during motor operation, a power circuit for applying electrical power from a DC source of electrical energy having residual series inductance comprising: a main solid-state switching device having its anode and cathode terminals in series with said windings; a rectifying means in parallel with the anode and cathode terminals of said main switching device, the anode of said rectifying means being connected directly to the cathode of the main switching device and the cathode of said rectifying means being connected directly to the anode of the main switching device; a commutating capacitor in series with the anode and cathode terminals of the main solid-state switching device and said winding; and a freewheeling solid-state switching device in parallel with said motor winding.
Claim 2
Dependent Claim
134 words
In a reluctance motor having a motor winding that has a varying inductance during motor operation, a power circuit for applying electrical power from a DC source of electrical energy having residual series inductance comprising: a main solid-state switching device having its anode and cathode terminals in series with said windings; a rectifying means in parallel with the anode and cathode terminals of said main switching device, the anode of said rectifying means being connected directly to the cathode of the main switching device and the cathode of said rectifying means being connected directly to the anode of the main switching device; a commutating capacitor in series with the anode and cathode terminals of the main solid-state switching device and said winding; and a freewheeling solid-state switching device in parallel with said motor winding.
Claim 3
Dependent Claim
17 words
The reluctance motor of claim 1 comprising reversing means for reversing a charge on said commutating capacitor.
Claim 4
Dependent Claim
35 words
The reluctance motor of claim 2 in which the reversing means comprises a reversing inductor in series with a solid-state switching device, said reversing inductor and switching device being in parallel with said commutating capacitor.
Claim 5
Dependent Claim
22 words
The reluctance motor of claim 3 in which the commutating capacitor is connected between the motor winding and the main switching device.
Claim 6
Dependent Claim
16 words
The reluctance motor of claim 4 in which the rectifying means is a solid-state switching device.
Claim 7
Dependent Claim
14 words
The reluctance motor of claim 5 in which the solid-state switching devices are thyristors.
Claim 8
Dependent Claim
60 words
The reluctance motor of claim 6 comprising a motor stator having spaced sectors of high magnetic permeance material, a motor rotor having sectors of high magnetic permeance material, and position sensing means for sensing the position of the rotor sectors of high permeance material relative to the stator sectors, said position sensing means generating signals that trigger said switching devices.
Claim 9
Dependent Claim
14 words
The reluctance motor of claim 1 in which the rectifying means is a thyristor.
Claim 10
Dependent Claim
60 words
The reluctance motor of claim 1 comprising a motor stator having spaced sectors of high magnetic permeance material, a motor rotor having sectors of high magnetic permeance material, and position sensing means for sensing the position of the rotor sectors of high permeance material relative to the stator sectors, said position sensing means generating signals that trigger said switching devices.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |