Patent US4628231A successfully refreshed from Google Patents.
US4628231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
DC motor with electronic commutation circuit
Assignee: US Philips Corp
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Filing: 1980-09-26
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Granted: 1986-12-09
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Expires: 2000-09-26
Abstract
Abstract A DC motor is commutated by magnetically controllable electronic switches in the form of integrated semiconductor circuits. Each switch comprises a first switching path between a first input terminal and an output terminal and a second switching path between a second input terminal and the output terminal. The two switching paths are controlled by the magnetic field of the rotor such that either the one or the other switching path is closed and that both switching paths are open in positions intermediate between these two positions.
Inventors
- 👤 Wolfgang Radziwill
- 👤 Gunter Doring
- 👤 Hans Steinbusch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:19
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02K29/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
186 words
A DC motor comprising a permanent-magnet rotor and an electronic commutation circuit including a plurality of magnetically controllable switches in the form of an integrated semiconductor circuit and controlled by the magnetic field of the rotor, a stator comprising m phase windings, each magnetically controllable switch including first and second input terminals, an output terminal and first and second switching paths between the first and second input terminals, respectively, and the output terminal, means connecting one end of each phase winding to the output terminal of a magnetically controllable switch, and a power supply source connected between the first and the second input terminals of each switch, said first and second switching paths being controllable so that, when a switch is exposed to a magnetic field B, its first switching path is closed if B>B 0 +[(ΔB)/2], its second switching path is closed if B<[(ΔB)/2], and its two switching paths are open if |B-B 0 |<[(ΔB)/2]×ε, where 0<ε<1 and ΔB≧0, the individual switches being symmetrically arranged about the stator of the motor so that they are controlled by the rotor magnetic field in a cyclic sequence.
Claim 2
Dependent Claim
186 words
A DC motor comprising a permanent-magnet rotor and an electronic commutation circuit including a plurality of magnetically controllable switches in the form of an integrated semiconductor circuit and controlled by the magnetic field of the rotor, a stator comprising m phase windings, each magnetically controllable switch including first and second input terminals, an output terminal and first and second switching paths between the first and second input terminals, respectively, and the output terminal, means connecting one end of each phase winding to the output terminal of a magnetically controllable switch, and a power supply source connected between the first and the second input terminals of each switch, said first and second switching paths being controllable so that, when a switch is exposed to a magnetic field B, its first switching path is closed if B>B 0 +[(ΔB)/2], its second switching path is closed if B<[(ΔB)/2], and its two switching paths are open if |B-B 0 |<[(ΔB)/2]×ε, where 0<ε<1 and ΔB≧0, the individual switches being symmetrically arranged about the stator of the motor so that they are controlled by the rotor magnetic field in a cyclic sequence.
Claim 3
Dependent Claim
22 words
A motor as claimed in claim 1, further comprising individual flywheel diodes connected in parallel with each switching path of each switch.
Claim 4
Dependent Claim
31 words
A motor as claimed in claim 1 wherein the rotor is axially magnetized and the switches are arranged about the peripehery of the rotor and confronting one or both rotor ends.
Claim 5
Dependent Claim
18 words
A motor as claimed in claim 1 wherein the switches are arranged on one common printed circuit board.
Claim 6
Dependent Claim
19 words
A motor as claimed in claim 4 wherein the switches are accommodated in recesses in the printed circuit board.
Claim 7
Dependent Claim
23 words
A motor as claimed in claim 4 wherein the printed circuit board and the coil formers of the stator windings form a unit.
Claim 8
Dependent Claim
30 words
A motor as claimed in claim 1 wherein the switches are mounted on a contact foil and are arranged in a transverse air gap formed between the stator and rotor.
Claim 9
Dependent Claim
34 words
A motor as claimed in claim 1 wherein the rotor is diametrically or radially magnetized and the switches are exposed to the main field or to the axial and stray field of the rotor.
Claim 10
Dependent Claim
37 words
A motor as claimed in claim 1 wherein the stator includes stator lamination assemblies and the stator lamination assemblies and the switches are arranged so that the influence of the stator field on the switches is negligible.
Claim 11
Dependent Claim
26 words
A motor as claimed in claims 1, 2, 3, 4 or 5 wherein the m phase windings of the stator are connected in m-cornered mesh configuration.
Claim 12
Dependent Claim
26 words
A motor as claimed in claims 1, 2, 3, 4 or 5 wherein the m phase windings of the stator are connected in a star configuration.
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) | 1989-12-08 | 1990-06-09 | 1990-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-08 | 1994-06-09 | 1994-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-08 | 1998-06-09 | 1998-12-09 | $7700.00 | Window Closed / Lapsed |