US4489265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric machine with continuous pole phase modulation
Assignee: Teco Holdings USA Inc
•
Filing: 1983-03-24
•
Granted: 1984-12-18
•
Expires: 2003-03-24
Abstract
Abstract A pole phase modulated rotary electric machine is provided with a uniformly slotted stator structure and a main stator winding which spans the entire stator periphery. A control stator winding is wound in selected slots of the stator structure and the average phase change between adjacent slots of the stator structure is controlled by controlling the phase angle of current supplied to the control winding using a rotary magnetic induction phase shifter, an isolated variable reactance load, or a switching arrangement which varies the current amplitude and magnetic field axis of the controlled winding. Pole phase modulation provides a continuously variable magnetic speed control of induction type electrical machines operating at a fixed power frequency.
Inventors
- 👤 Stephen B. Kuznetsov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:49
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/16; H02P25/18; H02P25/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
166 words
A variable speed electric machine comprising: a stator structure having a plurality of uniformly distributed axial slots disposed adjacent to the periphery of a generally cylindrical opening within said stator structure; a main stator winding including a plurality of coils having at least one conductor disposed within each of said slots, said main stator winding being connected to a plurality of terminals for connection to an external power source; a control stator winding including a plurality of coils having at least one conductor disposed within selected ones of said slots; a plurality of switches, each connected between one coil of said control stator winding and one of said terminals for connection to said external power source; means for controlling the operation of said switches to alter the phase change of current flowing in adjacent slots of said stator structure, thereby changing the effective number of poles along the periphery of said generally cylindrical opening by varying the magnitude of current flowing in said control stator winding.
Claim 2
Dependent Claim
166 words
A variable speed electric machine comprising: a stator structure having a plurality of uniformly distributed axial slots disposed adjacent to the periphery of a generally cylindrical opening within said stator structure; a main stator winding including a plurality of coils having at least one conductor disposed within each of said slots, said main stator winding being connected to a plurality of terminals for connection to an external power source; a control stator winding including a plurality of coils having at least one conductor disposed within selected ones of said slots; a plurality of switches, each connected between one coil of said control stator winding and one of said terminals for connection to said external power source; means for controlling the operation of said switches to alter the phase change of current flowing in adjacent slots of said stator structure, thereby changing the effective number of poles along the periphery of said generally cylindrical opening by varying the magnitude of current flowing in said control stator winding.
Claim 3
Dependent Claim
203 words
A variable speed electric machine comprising: a stator structure having a plurality of uniformly distributed axial slots disposed adjacent to the periphery of a generally cylindrical opening within said stator structure; a plurality of terminals for connection to an external power source; a main stator winding connected in a delta configuration between said terminals and including a plurality of coils having at least one conductor disposed in each of said slots; a control stator winding connected in a delta configuration between said terminals and including a plurality of coils having at least one conductor disposed within selected ones of said slots; means for varying the phase change between adjacent ones of said slots caused by current flowing in said control stator winding and said main stator winding, thereby varying the effective number of poles formed by current flowing through said main and control stator windings; a second control stator winding having a first end connected to one of said terminals; a first switch connected between a second end of said second control stator winding and a second one of said terminals; and a second switch connected between said second end of said second control stator winding and a third one of said terminals.
Claim 4
Dependent Claim
203 words
A variable speed electric machine comprising: a stator structure having a plurality of uniformly distributed axial slots disposed adjacent to the periphery of a generally cylindrical opening within said stator structure; a plurality of terminals for connection to an external power source; a main stator winding connected in a delta configuration between said terminals and including a plurality of coils having at least one conductor disposed in each of said slots; a control stator winding connected in a delta configuration between said terminals and including a plurality of coils having at least one conductor disposed within selected ones of said slots; means for varying the phase change between adjacent ones of said slots caused by current flowing in said control stator winding and said main stator winding, thereby varying the effective number of poles formed by current flowing through said main and control stator windings; a second control stator winding having a first end connected to one of said terminals; a first switch connected between a second end of said second control stator winding and a second one of said terminals; and a second switch connected between said second end of said second control stator winding and a third one of said terminals.
Claim 5
Dependent Claim
16 words
An electric machine as recited in claim 2, wherein said first and second switches are thyristors.
Claim 6
Dependent Claim
18 words
An electric machine as recited in claim 3, further comprising: means for controlling the operation of said thyristors.
Claim 7
Dependent Claim
160 words
A variable speed electric machine comprising: a stator structure having a plurality of uniformly distributed axial slots disposed adjacent to the periphery of a generally cylindrical opening within said stator structure; a plurality of terminals for connection to an external power source; a main stator winding connected in a delta configuration between said terminals and including a plurality of coils having at least one conductor disposed in each of said slots; a control stator winding having a first end connected to a first one of said terminals and wound to include at least one conductor within selected ones of said slots; and means for connecting a second end of said control stator winding alternatively to a second and third one of said terminals, thereby varying the phase difference between adjacent ones of said slots caused by currents in said main stator winding and said control stator winding in said slots having conductors of both said main and control stator windings.
Claim 8
Dependent Claim
160 words
A variable speed electric machine comprising: a stator structure having a plurality of uniformly distributed axial slots disposed adjacent to the periphery of a generally cylindrical opening within said stator structure; a plurality of terminals for connection to an external power source; a main stator winding connected in a delta configuration between said terminals and including a plurality of coils having at least one conductor disposed in each of said slots; a control stator winding having a first end connected to a first one of said terminals and wound to include at least one conductor within selected ones of said slots; and means for connecting a second end of said control stator winding alternatively to a second and third one of said terminals, thereby varying the phase difference between adjacent ones of said slots caused by currents in said main stator winding and said control stator winding in said slots having conductors of both said main and control stator windings.
Claim 9
Dependent Claim
63 words
An electric machine as recited in claim 5, wherein said means for connecting a second end of said control stator winding comprises: a first switch connected between said second end of said control stator winding and said second one of said terminals; and a second switch connected between said second end of said control stator winding and said third one of said terminals.
Claim 10
Dependent Claim
16 words
An electric machine as recited in claim 6, wherein said first and second switches are thyristors.
Claim 11
Dependent Claim
18 words
An electric machine as recited in claim 7, further comprising: means for controlling the operation of said thyristors.
Claim 12
Dependent Claim
97 words
An electric machine as recited in claim 5, further comprising: a second control stator winding having a first end connected to said second terminal and wound to include at least one conductor within selected ones of said slots; and means for connecting a second end of said second control stator winding alternatively to said first and third terminals, thereby varying the phase difference between adjacent ones of said slots caused by currents in said main stator winding and said second control stator winding in said slots having conductors of both said main and second control stator windings.
Claim 13
Dependent Claim
85 words
An electric machine as recited in claim 9, further comprising: a third control stator winding connected in a delta configuration between said terminals and including a plurality of coils having at least one conductor disposed within selected ones of said slots; and means for varying the phase of current flowing in said third control stator winding with reference to current flowing in said main stator winding, thereby varying the effective number of poles formed by current flowing through said main and third control stator windings.
Claim 14
Dependent Claim
97 words
An electric machine as recited in claim 9, further comprising: a third control stator winding having a first end connected to said third terminal and wound to include at least one conductor within selected ones of said slots; and means for connecting a second end of said third control stator winding alternatively to said first and second terminals, thereby varying the phase difference between adjacent ones of said slots casued by currents in said main stator winding and said third control stator winding in said slots having conductors of both said main and third control stator windings.
Claim 15
Dependent Claim
85 words
An electric machine as recited in claim 11, further comprising: a fourth control stator winding connected in a delta configuration between said terminals and including a plurality of coils having at least one conductor disposed within selected ones of said slots; and means for varying the phase of current flowing in said fourth control stator winding with reference to current flowing in said main stator winding, thereby varying the effective number of poles formed by current flowing through said main and fourth control stator windings.
References Cited (Backward Citations)
US4152630A
Cited
US4338557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |