Patent EP0341630A2 successfully refreshed from Google Patents.
EP0341630A2
Expired / Lapsed
EP
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Permanent magnet type synchronous motor
Assignee: Hitachi Taga Engineering Co Ltd
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Filing: 1989-05-08
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Granted: —
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Expires: 2009-05-08
Abstract
Abstract A rotor (101) of a permanent magnet type synchronous motor facing to a stator (106) having a number of slots (107), comprises a rotor core (103) fixed to a motor shaft (105) and an even-numbered permanent magnet provided on a circumferential direction of the rotor core. Projecting portions (103A) are formed in the shape of protruding a portion of the rotor core among each permanent magnet. The width (A) of each projecting portion is different from the pitch (B) of the slots of the stator. A position detector (2) for detecting the permanent magnet position of the rotor comprises detectors (30A, 30B, 30C) of the normal rotation and other detectors (30D, 30E, 30F) of the reverse rotation. These detectors are arranged having predetermined phase differences (a, β) to a center line. A pattern generating circuit (18) is provided for switching the conducting position to the stator winding corresponding to the phase differences.
Inventors
- 👤 Jun Matsubayashi
- 👤 Fumio Tajima
- 👤 Kunio Miyashita
- 👤 Kazuaki Takada
- 👤 Kuniaki Kubokura
- 👤 Eiji Toyoda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 13:32
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/14; H02K29/00; H02K29/06; H02K29/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
103 words
A permanent magnet type synchronous motor having a stator (106) provided with a plurality of slots (107), and a rotor (101) disposed close to and in opposition to said stator so that said rotor can be rotated, said rotor comprising a rotor core (103) mounted fixedly on a motor shaft (105), and an even-numbered permanent magnet (102) being provided on a circumferential portion of said rotor core, characterized in that said rotor core has projecting portions (103A) among said permanent magnets, the width (A) of each of said projecting portions being set different from the pitch (B) of said slots in said stator.
Claim 2
Dependent Claim
103 words
A permanent magnet type synchronous motor having a stator (106) provided with a plurality of slots (107), and a rotor (101) disposed close to and in opposition to said stator so that said rotor can be rotated, said rotor comprising a rotor core (103) mounted fixedly on a motor shaft (105), and an even-numbered permanent magnet (102) being provided on a circumferential portion of said rotor core, characterized in that said rotor core has projecting portions (103A) among said permanent magnets, the width (A) of each of said projecting portions being set different from the pitch (B) of said slots in said stator.
Claim 3
Dependent Claim
47 words
A permanent magnet type synchronous motor according to Claim 1, wherein the width A of said projecting portion is set so as to satisfy or substantially satisfy the equation, A = (n + 111) 6 wherein B is the pitch of said slots; and n an integer.
Claim 4
Dependent Claim
129 words
A permanent magnet type synchronous motor having a stator provided with a plurality of slots, and a rotor disposed close to and in opposition to said stator so that said rotor can be rotated, said rotor consisting of a rotor core mounted fixedly on a motor shaft, and an even-numbered permanent magnets provided on a circumferential portion of said rotor core, said stator having detectors (30) for determining the positions of said permanent magnets on said rotor, characterized in that said position detectors consist of two sets of position detectors of position detectors (30A, 30B, 30C) for a normal rotation of said motor, and position detectors (30D, 30E, 30F) for a reverse rotation of said motor, said two sets of position detectors having a predetermined phase differences (a, B).
Claim 5
Dependent Claim
129 words
A permanent magnet type synchronous motor having a stator provided with a plurality of slots, and a rotor disposed close to and in opposition to said stator so that said rotor can be rotated, said rotor consisting of a rotor core mounted fixedly on a motor shaft, and an even-numbered permanent magnets provided on a circumferential portion of said rotor core, said stator having detectors (30) for determining the positions of said permanent magnets on said rotor, characterized in that said position detectors consist of two sets of position detectors of position detectors (30A, 30B, 30C) for a normal rotation of said motor, and position detectors (30D, 30E, 30F) for a reverse rotation of said motor, said two sets of position detectors having a predetermined phase differences (a, B).
Claim 6
Dependent Claim
26 words
A permanent magnet type synchronous motor according to Claim 3, wherein both of said two position detectors are arranged collectively in one direction of said stator.
Claim 7
Dependent Claim
26 words
A permanent magnet type synchronous motor according to Claim 3, wherein both of said two position detectors are arranged separately in one direction of said stator.
Claim 8
Dependent Claim
24 words
A permanent magnet type synchronous motor according to Claim 4, wherein said two sets of position detectors are fixed to the same substrate (40).
Claim 9
Dependent Claim
91 words
A permanent magnet type synchronous motor having a stator provided with a plurality of slots, and a rotor disposed close to and in opposition to said stator so that said rotor can be rotated, said rotor consisting of a rotor core mounted fixedly on a motor shaft, and an even-numbered permanent magnets provided on a circumferential portion of said rotor core, characterized in that said rotor core has projecting portions among said permanent magnets members (103B) for holding said permanent magnets being provided at the free ends of said projecting portions.
Claim 10
Dependent Claim
91 words
A permanent magnet type synchronous motor having a stator provided with a plurality of slots, and a rotor disposed close to and in opposition to said stator so that said rotor can be rotated, said rotor consisting of a rotor core mounted fixedly on a motor shaft, and an even-numbered permanent magnets provided on a circumferential portion of said rotor core, characterized in that said rotor core has projecting portions among said permanent magnets members (103B) for holding said permanent magnets being provided at the free ends of said projecting portions.
Claim 11
Dependent Claim
26 words
A permanent magnet type synchronous motor according to Claim 7, wherein resilient intervenient members (108) are inserted between said magnet holding members and said permanent magnets.
Claim 12
Dependent Claim
32 words
A permanent magnet type synchronous motor according to Claim 7, wherein claws (103C) are formed on said magnet holding members, said permanent magnets being pressed by the resilient force of said claws.
Claim 13
Dependent Claim
105 words
An electric sewing machine provided with a permanent magnet type synchronous motor, characterized in that said synchronous motor consists of a stator provided with a plurality of slots, and a rotor disposed close to and in opposition to said stator so that said rotor can be rotated, said rotor being composed of a rotor core mounted fixedly on a motor shaft, and an even-numbered permanent magnets provided on a circumferential portion of said rotor core, said rotor core having projecting portions among said permanent magnets, the width of each of said projecting portions being set different from the pitch of said slots in said stator.
Claim 14
Dependent Claim
105 words
An electric sewing machine provided with a permanent magnet type synchronous motor, characterized in that said synchronous motor consists of a stator provided with a plurality of slots, and a rotor disposed close to and in opposition to said stator so that said rotor can be rotated, said rotor being composed of a rotor core mounted fixedly on a motor shaft, and an even-numbered permanent magnets provided on a circumferential portion of said rotor core, said rotor core having projecting portions among said permanent magnets, the width of each of said projecting portions being set different from the pitch of said slots in said stator.
Claim 15
Dependent Claim
189 words
A permanent magnet type synchronous motor comprising a means (2) for detecting a magnetic pole position of a rotor (101), and a driving circuit (4) for driving the motor corresponding to a control signal, the rotor having a rotor core (103) mounted fixedly on a motor shaft (105), and an even-numbered permanent magnets (102) providing on a circumferential portion of the rotor core, characterized in that said rotor core has projecting portions (103) among said permanent magnets, and further comprising a pattern generating circuit which inputs normal or reverse rotation instruction signal, on output signal from said means for detecting the magnetic position in the normal or reverse rotation of the motor, and a control signal of a motor starting position corresponding to the normal or reverse rotation instruction signal for outputting a signal to said driving circuit to decide a conducting position of the motor, and a control circuit (5) for controlling said stator by a pulse width modulation signal corresponding to said magnetic pole position of said rotor, wherein said driving circuit being controlled depending on output signals of the pattern generating circuit and the control circuit.
Claim 16
Dependent Claim
189 words
A permanent magnet type synchronous motor comprising a means (2) for detecting a magnetic pole position of a rotor (101), and a driving circuit (4) for driving the motor corresponding to a control signal, the rotor having a rotor core (103) mounted fixedly on a motor shaft (105), and an even-numbered permanent magnets (102) providing on a circumferential portion of the rotor core, characterized in that said rotor core has projecting portions (103) among said permanent magnets, and further comprising a pattern generating circuit which inputs normal or reverse rotation instruction signal, on output signal from said means for detecting the magnetic position in the normal or reverse rotation of the motor, and a control signal of a motor starting position corresponding to the normal or reverse rotation instruction signal for outputting a signal to said driving circuit to decide a conducting position of the motor, and a control circuit (5) for controlling said stator by a pulse width modulation signal corresponding to said magnetic pole position of said rotor, wherein said driving circuit being controlled depending on output signals of the pattern generating circuit and the control circuit.
References Cited (Backward Citations)
No citation records indexed.
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