US4476422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single phase four pole/six pole motor
Assignee: AO Smith Corp
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Filing: 1983-04-11
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Granted: 1984-10-09
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Expires: 2003-04-11
Abstract
Abstract A single phase alternating current electric motor is provided with a main stator winding having two coil groups each including the series connection of three coils. These coil groups can be connected in series for six pole operation and in parallel for four pole operation. The coils are approximately equally spaced around the periphery of the machine but are not of equal numbers of turns. The two coil groups are identically wound and spaced 180 mechanical degrees apart. One coil of each group has more turns and a greater span than the other two coils.
Inventors
- 👤 Herbert S. Kirschbaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:59
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/16; H02P25/18; H02P25/20; H02K; H02K3/00
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
141 words
A single phase alternating current electric motor comprising: a main stator winding wound to pass through a plurality of uniformly spaced slots in a stator and including two identical coil groups each having three series connected coils wherein all six coils are approximately equally spaced around the motor periphery, corresponding coils in each of said coil groups are spaced 180 mechanical degrees apart, and a first coil in each of said coil groups has a number of turns which differs from the number of turns of the other coils; means for connecting said two coil groups to form six poles for six pole motor operation; and means for connecting said two coil groups to form four poles for four pole motor operation, wherein one of said coil groups has a reversed polarity with respect to its connection for six pole operation.
Claim 2
Dependent Claim
141 words
A single phase alternating current electric motor comprising: a main stator winding wound to pass through a plurality of uniformly spaced slots in a stator and including two identical coil groups each having three series connected coils wherein all six coils are approximately equally spaced around the motor periphery, corresponding coils in each of said coil groups are spaced 180 mechanical degrees apart, and a first coil in each of said coil groups has a number of turns which differs from the number of turns of the other coils; means for connecting said two coil groups to form six poles for six pole motor operation; and means for connecting said two coil groups to form four poles for four pole motor operation, wherein one of said coil groups has a reversed polarity with respect to its connection for six pole operation.
Claim 3
Dependent Claim
40 words
An electric motor as recited in claim 1, wherein each coil group of said main stator winding comprises: a primary coil; and two secondary coils, wherein said primary coil has more turns and a larger span than said secondary coils.
Claim 4
Dependent Claim
36 words
An electric motor as recited in claim 2, wherein the span of each of said primary coils is about two pole pitches and the span of each of said secondary coils is about one pole pitch.
Claim 5
Dependent Claim
23 words
An electric motor as recited in claim 2, wherein said primary coils are centered between said secondary coils of the same coil group.
Claim 6
Dependent Claim
33 words
An electric motor as recited in claim 2, wherein the number of turns in each of said primary coils is approximately 12/3 times the number of turns in each of said secondary coils.
Claim 7
Dependent Claim
119 words
An electric motor as recited in claim 1, further comprising: an auxiliary stator winding wound to pass through said uniformly spaced slots in said stator and including two identical coil groups each having three series connected coils wherein all six auxiliary coils are equally spaced around the motor periphery with corresponding coils in each of said auxiliary winding coil groups being spaced 180 mechanical degrees apart and with at least two of said six auxiliary coils having an equal number of turns which differs from the number of turns in the other auxiliary coils; a capacitor; means for connecting said two auxiliary coil groups to form six poles and in series with said capacitor for six pole motor operation.
Claim 8
Dependent Claim
44 words
An electric motor as recited in claim 6, wherein each coil group of said auxiliary stator winding comprises: a primary auxiliary coil; and two secondary auxiliary coils, wherein said primary auxiliary coil has more turns and a larger span than said secondary auxiliary coils.
Claim 9
Dependent Claim
38 words
An electric motor as recited in claim 7, wherein the span of each of said primary auxiliary coils is about two pole pitches and the span of each of said secondary auxiliary coils is about one pole pitch.
Claim 10
Dependent Claim
25 words
An electric motor as recited in claim 7, wherein said primary auxiliary coils are centered between said secondary auxiliary coils of the same coil group.
Claim 11
Dependent Claim
35 words
An electric motor as recited in claim 7, wherein the number of turns at each of said primary auxiliary coils is approximately 12/3 times the number of turns in each of said secondary auxiliary coils.
Claim 12
Dependent Claim
52 words
An electric motor as recited in claim 6, further comprising: means for connecting said two auxiliary coil groups to form four poles and in series with said capacitor for four pole operation, wherein one of said auxiliary coil groups has a reversed polarity with respect to its connection for six pole operation.
Claim 13
Dependent Claim
56 words
An electric motor as recited in claim 6, further comprising: a second capacitor; and means for connecting said two auxiliary coil groups to form four poles in series with said second capacitor for four pole operation, wherein one of said auxiliary coil groups has a reversed polarity with respect to its connection for six pole operation.
Claim 14
Dependent Claim
104 words
An electric motor as recited in claim 1, further comprising: a first capacitor; a four pole auxiliary winding displaced 90 electrical degrees from said main stator winding, when connected to form four poles, and connected in series with said first capacitor to form a first auxiliary circuit; a second capacitor; a six pole auxiliary winding displaced 90 electrical degrees from said main stator winding, when connected to form six poles, and connected in series with said second capacitor to form a second auxiliary circuit; and means for alternatively connecting one of said first and second auxiliary circuits in parallel with said main stator winding.
Claim 15
Dependent Claim
137 words
A single phase alternating current electric motor comprising: a main stator winding wound to pass through a plurality of uniformly spaced slots in a stator and including two identical coil groups each having three series connected coils wherein all six coils are approximately equally spaced around the motor periphery, corresponding coils in each of said coil groups are spaced 180 mechanical degrees apart, and a first coil in each of said coil groups has a number of turns which differs from the number of turns of the other coils; means for connecting said two coil groups in series for six pole motor operation; and means for connecting said two coil groups in parallel for four pole motor operation, wherein one of said coil groups has a reversed polarity with respect to its connection for six pole operation.
Claim 16
Dependent Claim
137 words
A single phase alternating current electric motor comprising: a main stator winding wound to pass through a plurality of uniformly spaced slots in a stator and including two identical coil groups each having three series connected coils wherein all six coils are approximately equally spaced around the motor periphery, corresponding coils in each of said coil groups are spaced 180 mechanical degrees apart, and a first coil in each of said coil groups has a number of turns which differs from the number of turns of the other coils; means for connecting said two coil groups in series for six pole motor operation; and means for connecting said two coil groups in parallel for four pole motor operation, wherein one of said coil groups has a reversed polarity with respect to its connection for six pole operation.
Claim 17
Dependent Claim
40 words
An electric motor as recited in claim 14, wherein each coil group of said main stator winding comprises: a primary coil; and two secondary coils, wherein said primary coil has more turns and a larger span than said secondary coils.
Claim 18
Dependent Claim
36 words
An electric motor as recited in claim 15, wherein the span of each of said primary coils is about two pole pitches and the span of each of said secondary coils is about one pole pitch.
Claim 19
Dependent Claim
23 words
An electric motor as recited in claim 15, wherein said primary coils are centered between said secondary coils of the same coil group.
Claim 20
Dependent Claim
33 words
An electric motor as recited in claim 15, wherein the number of turns in each of said primary coils is approximately 12/3 times the number of turns in each of said secondary coils.
Claim 21
Dependent Claim
130 words
An electric motor as recited in claim 14, further comprising: an auxiliary stator winding wound to pass through said uniformly spaced slots in said stator and including two identical coil groups each having three series connected coils with corresponding coils in each of said auxiliary winding coil groups being spaced 180 mechanical degrees apart and wherein all six auxiliary coils are equally spaced around the motor periphery and displaced 90 electrical degrees from said main stator winding coils, at least two of said six auxiliary coils having an equal number of turns which differs from the number of turns in the other auxiliary coils; a capacitor; means for connecting said two auxiliary coil groups in series with each other and in series with said capacitor for six pole motor operation.
Claim 22
Dependent Claim
44 words
An electric motor as recited in claim 19, wherein each coil group of said auxiliary stator winding comprises: a primary auxiliary coil; and two secondary auxiliary coils, wherein said primary auxiliary coil has more turns and a larger span than said secondary auxiliary coils.
Claim 23
Dependent Claim
38 words
An electric motor as recited in claim 20, wherein the span of each of said primary auxiliary coils is about two pole pitches and the span of each of said secondary auxiliary coils is about one pole pitch.
Claim 24
Dependent Claim
25 words
An electric motor as recited in claim 20, wherein said primary auxiliary coils are centered between said secondary auxiliary coils of the same coil group.
Claim 25
Dependent Claim
35 words
An electric motor as recited in claim 20, wherein the number of turns in each of said primary auxiliary coils is approximately 12/3 times the number of turns in each of said secondary auxiliary coils.
Claim 26
Dependent Claim
53 words
An electric motor as recited in claim 19, further comprising: means for connecting said two auxiliary coil groups in parallel with each other and in series with said capacitor for four pole operation, wherein one of said auxiliary coil groups has a reversed polarity with respect to its connection for six pole operation.
Claim 27
Dependent Claim
58 words
An electric motor as recited in claim 19, further comprising: a second capacitor; and means for connecting said two auxiliary coil groups in parallel with each other and in series with said second capacitor for four pole operation, wherein one of said auxiliary coil groups has a reversed polarity with respect to its connection for six pole operation.
Claim 28
Dependent Claim
102 words
An electric motor as recited in claim 14, further comprising: a first capacitor; a four pole auxiliary winding displaced 90 electrical degrees from said main stator winding in the four pole configuration and connected in series with said first capacitor to form a first auxiliary circuit; a second capacitor; a six pole auxiliary winding displaced 90 electrical degrees from said main stator winding in the six pole configuration and connected in series with said second capacitor to form a second auxiliary circuit; and means for alternatively connecting one of said first and second auxiliary circuits in parallel with said main stator winding.
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) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |