EP0229018A2
Expired / Lapsed
EP
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Three-phase induction motor
Assignee: NEC Corp
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Filing: 1987-01-07
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Granted: —
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Expires: 2007-01-07
Abstract
Abstract A three-phase induction motor includes winding slots (1) and a stator winding (4). The number of winding slots (1) per pole and phase is a noninteger. The stator winding (4) is a three-phase balanced winding. A pitch s of the winding satisfies s = (r - t) /r or s = r/ (r + t) (where t is an odd number and r is the order of a harmonic wave to be eliminated). The motor produces less torque ripple.
Inventors
- 👤 Kiyokazu C/O Nec Corporation Okamoto
- 👤 Hiroshi Nippon Electric Industry Co. Ltd. Iijima
- 👤 Tetsuo Nippon Electric Industry Co. Ltd. Endo
- 👤 Yukio Nippon Electric Industry Co. Ltd. Miyamoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 17:03
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
76 words
A three-phase induction motor characterized by: winding slots (1; 5), the number of said winding slots (1; 5) per pole and phase being a noninteger; and a stator winding (4, 8) wound as a three-phase balanced winding, a pitch s of which satisfies s = (r - t) /r or s = r/ (r + t) (where t is an odd number and r is an order of a harmonic wave (3; 7) to be eliminated).
Claim 2
Dependent Claim
76 words
A three-phase induction motor characterized by: winding slots (1; 5), the number of said winding slots (1; 5) per pole and phase being a noninteger; and a stator winding (4, 8) wound as a three-phase balanced winding, a pitch s of which satisfies s = (r - t) /r or s = r/ (r + t) (where t is an odd number and r is an order of a harmonic wave (3; 7) to be eliminated).
Claim 3
Dependent Claim
10 words
A motor according to claim 1, wherein t = 1.
Claim 4
Dependent Claim
63 words
A motor according to claim 1 or 2, wherein said motor comprises a stator, the number N of slots of which is 15 when a number ℓ of poles is 2, a number m of phases is 3, a number q of slots per pole and phase is 2.5, and the order of the harmonic wave (3; 7) to be eliminated is 5.
Claim 5
Dependent Claim
64 words
A motor according to claim 1 or 2, wherein said motor comprises a stator, a total number N of slots of which is 21 when a number ℓ of poles is 2, a number m of phases is 3, a number q of slots per pole and phase is 3.5, and the order of the harmonic wave (3; 6) to be eliminated is 7.
References Cited (Backward Citations)
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