US3845369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Starting control for brushless synchronous motors
Assignee: Westinghouse Electric Corp
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Filing: 1973-05-10
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Granted: 1974-10-29
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Expires: 1993-05-10
Abstract
Abstract A starting control means for brushless synchronous motors in which a discharge resistor is provided in the form of a wirewound coil mounted on a control wheel which also carries solidstate switching and control devices making up the starting control circuit, and which is designed to serve as a heat sink for the coil and other devices and also as a part of the electrical circuit.
Inventors
- 👤 C Heyne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:10
CPC Classifications
H; H02; H02K; H02K11/00; H02K11/04; H02K11/042; H02P; H02P25/00; H02P25/02; H02P25/022; H02P25/03
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
144 words
A synchronous motor having a rotor member including a field member, a field winding on said field member, a source of direct current excitation for said field winding, a control wheel on the rotor member, an annular, multi-turn wire coil disposed on said control wheel substantially coaxial therewith, and solid-state control means carried on the control wheel and adapted to connect said coil across the field winding during starting of the motor and to disconnect the coil and apply said direct current excitation to the field winding for synchronous operation of the motor; said control means including solid-state switch devices and static circuit components interconnected in a control circuit, said control wheel being made of electrically conductive material of good thermal conductivity, and at least one of said solid-state switch devices being mounted directly on the wheel in good electrical and thermal contact therewith.
Claim 2
Dependent Claim
144 words
A synchronous motor having a rotor member including a field member, a field winding on said field member, a source of direct current excitation for said field winding, a control wheel on the rotor member, an annular, multi-turn wire coil disposed on said control wheel substantially coaxial therewith, and solid-state control means carried on the control wheel and adapted to connect said coil across the field winding during starting of the motor and to disconnect the coil and apply said direct current excitation to the field winding for synchronous operation of the motor; said control means including solid-state switch devices and static circuit components interconnected in a control circuit, said control wheel being made of electrically conductive material of good thermal conductivity, and at least one of said solid-state switch devices being mounted directly on the wheel in good electrical and thermal contact therewith.
Claim 3
Dependent Claim
25 words
The combination defined in claim 1 in which said control wheel has a recess extending circumferentially thereof and said coil is disposed in said recess.
Claim 4
Dependent Claim
34 words
The combination defined in claim 2 in which the control wheel is made of material of good thermal conductivity and the coil is disposed in the recess in good thermal relation with the wheel.
Claim 5
Dependent Claim
46 words
The combination defined in claim 1 including a heat sink member mounted on said wheel and insulated therefrom, a solid-state switch device mounted on said heat sink, and means interconnecting said switch devices in a control circuit including the wheel as a part of the circuit.
Claim 6
Dependent Claim
144 words
In a synchronous motor, a rotor member having a field winding thereon, a source of direct current excitation on the rotor member, a control wheel on the rotor member, said control wheel having a radial flange portion, a multi-turn wire coil mounted on the control wheel on one side of said flange, a plurality of solid-state switching and control devices mounted on the control wheel on the other side of said flange, and means interconnecting said switching and control devices in a control circuit for connecting said coil across said field winding during starting of the motor and for disconnecting the coil and connecting said source of direct current excitation To the field winding for synchronous operation of the motor; said control wheel having an axially-extending rim forming a recess on said one side of the flange, said coil being mounted in said recess.
Claim 7
Dependent Claim
144 words
In a synchronous motor, a rotor member having a field winding thereon, a source of direct current excitation on the rotor member, a control wheel on the rotor member, said control wheel having a radial flange portion, a multi-turn wire coil mounted on the control wheel on one side of said flange, a plurality of solid-state switching and control devices mounted on the control wheel on the other side of said flange, and means interconnecting said switching and control devices in a control circuit for connecting said coil across said field winding during starting of the motor and for disconnecting the coil and connecting said source of direct current excitation To the field winding for synchronous operation of the motor; said control wheel having an axially-extending rim forming a recess on said one side of the flange, said coil being mounted in said recess.
Claim 8
Dependent Claim
33 words
The combination defined in claim 5 in which the control wheel is made of a material of high thermal conductivity and the coil is mounted in good heat transfer relation to the wheel.
Claim 9
Dependent Claim
54 words
The combination defined in claim 5 in which said wheel is made of metal of good thermal and electrical conductivity, and said control circuit includes at least one solid-state switching device mounted directly on the wheel in thermal and electrical contact therewith, and said interconnecting means includes the wheel as part of the circuit.
Claim 10
Dependent Claim
78 words
The combination defined in claim 5 in which said wheel is made of metal of good thermal and electrical conductivity, a conductive heat sink mounted on the wheel and insulated therefrom, a first solid-state switching device mounted on said heat sink in conductive relation therewith, a second solid-state switching device mounted directly on the wheel in thermal and electrical contact therewith, and said means for interconnecting said switching devices includes the wheel as a part of the circuit.
Claim 11
Dependent Claim
116 words
The combination defined in claim 5 in which said wheel is made of metal of good thermal and electrical conductivity, said coil being mounted in said recess on said one side of the flange and in good heat transfer relation to the wheel, said rim extending axially in both directions from the flange, said switching and control devices being mounted on the wheel on the other side of the flange and including at least one switching device mounted directly on said rim in thermal and electrical contact therewith, said coil having leads extending through the flange, and means including the wheel for interconnecting said switching and control devices and said coil leads in said control circuit.
Claim 12
Dependent Claim
136 words
The combination defined in claim 9 and including a conductive heat sink mounted on the rim on said other side of the flange and insulated therefrom, a first solid-state switching device mounted on said heat sink in conductive relation therewith and having another terminal directly connected to the wheel, a second solid-state switching device mounted directly on the rim on said other side of the flange in thermal and electrical contact with the rim, said direct current source including two leads extending axially of the rotor member and passing through the flange, one of said leads being connected to said heat sink and the other of said leads being adapted for connection to one side of said field winding, and means for effecting connection of the other side of the field winding directly to the wheel.
References Cited (Backward Citations)
US3405338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |