# US 10,374,540 B2 · Synchronous motor having component identical to that of another kind of synchronous motor and method of manufacturing synchronous motors

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- Number: US 10,374,540 B2
- Document ID: US10374540B2
- Status: Granted
- Kind: B2
- Application number: 15/678,800
- Filed: 2017-08-16
- Published: 2018-02-22
- Granted: 2019-08-06
- Earliest claimed: 2016-08-19
- Assignees: Fanuc Corporation
- Applicants: Fanuc Corporation
- Inventors: Tatsuya Senoo
- Web page: https://patentgrep.com/patent/US10374540B2

## CPC

- H02P 25/20: for pole-changing
- H02K 1/28: Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K 15/02: of stator or rotor bodies
- H02K 17/14: having windings arranged for permitting pole-changing
- H02K 21/16: having annular armature cores with salient poles (with homopolar co-operation H02K21/20)
- H02K 1/27: Rotor cores with permanent magnets
- H02K 2201/06: Magnetic cores, or permanent magnets characterised by their skew
- H02K 2213/03: Machines characterised by numerical values, ranges, mathematical expressions or similar information
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A synchronous motor is driven by three phase alternate current. The rotor core includes a laminated body configured by laminating plate members made of electrical steel sheet. Each plate member is formed in a substantially circular shape in a plan view and formed with projections along an outer circumference thereof. The number of slots of the stator is 3xy when variable x is a natural number and variable y is a positive odd number. The number of poles of the rotor is (3y+1)x or (3y−1)x. The number of projections of each plate member is a common measure of (3y+1)x and (3y−1)x. The laminated body has a structure in which the plate members are laminated so that the projections are shifted relative to one another.

## Claims

### Claim 1

A synchronous motor driven by three phase alternate current, comprising:
a rotor including a rotor core and magnets fixed to the rotor core; and
a stator including a stator core; wherein
the rotor core includes a laminated body configured by laminating plate members made of electrical steel sheet;
each plate member is formed in a substantially circular shape in a plan view and formed with projections along an outer circumference;
the number of slots of the stator is 3xy, the number of poles of the rotor is (3y+1)x or (3y−1)x, and the number of projections of each plate member is a common measure of (3y+1)x and (3y−1)x, when variable x is a natural number and variable y is a positive odd number;
the laminated body has a structure in which the plate members are laminated so that the projections are shifted relative to one another; and
the magnets are fixed between the projections.

### Claim 2 (depends on 1)

The synchronous motor according to claim 1, wherein the number of projections of each plate member is the greatest common measure of (3y+1)x and (3y−1)x.

### Claim 3 (depends on 1)

The synchronous motor according to claim 1, wherein the variable y has a value not greater than 3.

### Claim 4

A synchronous motor driven by three phase alternate current, comprising:
a rotor including a rotor core and magnets fixed to the rotor core; and
a stator including a stator core; wherein
the rotor core includes a laminated body configured by laminating plate members made of electrical steel sheet;
each plate member is formed in a substantially circular shape in a plan view and formed with projections along an outer circumference;
the number of slots of the stator is 2xz, the number of poles of the rotor is 2(z+1)x or 2(z−1)x, and the number of projections of each plate member is a common measure of 2(z+1)x and 2(z−1)x, when variable x is a natural number and variable z is a positive multiple of 3;
the laminated body has a structure in which the plate members are laminated so that the projections are shifted relative to one another; and
the magnets are fixed between the projections.

### Claim 5 (depends on 4)

The synchronous motor according to claim 4, wherein the number of projections of each plate member is the greatest common measure of 2(z+1)x and 2(z−1)x.

### Claim 6 (depends on 4)

The synchronous motor according to claim 4, wherein the variable z has a value not greater than 9.

### Claim 7

A manufacturing method of manufacturing synchronous motors of more than one kind driven by three phase alternate current, the method comprising:
a step of forming stators;
a step of forming rotors; and
an assembly step of assembling the synchronous motors, each synchronous motor assembled by disposing a rotor inside a stator; wherein
the step of forming rotors includes:
a preparation step of preparing plate members, each plate member formed in a substantially circular shape in a plan view and formed with projections along an outer circumference;
a laminating step of forming laminated bodies, each laminated body configured by laminating a plurality of plate members so that the projections are shifted relative to one another; and
a step of fixing magnets between the projections of each laminated body; wherein
the synchronous motors of more than one kind include first synchronous motor of which the number of slots of the stator is 3xy and the number of poles of the rotor is (3y+1)x and second synchronous motor of which the number of slots of the stator is 3xy and the number of poles of the rotor is (3y−1)x, when variable x is a natural number and variable y is a positive odd number;
the step of forming stators includes a step of forming stator cores, the number of slots of each stator core being 3xy;
the preparation step includes a step of preparing plate members, the number of projections of each plate member being a common measure of (3y+1)x and (3y−1)x;
the laminating step includes a step of forming first laminated body configured so that the projections are shifted relative to one another so as to form regions in which (3y+1)x magnets are disposed and a step of forming second laminated body configured so that the projections are shifted relative to one another so as to form regions in which (3y−1)x magnets are disposed; and
the assembly step includes a step of assembling the first synchronous motor from the rotor including the first laminated body and the stator, and a step of assembling the second synchronous motor from the rotor including the second laminated body and the stator.

### Claim 8

A manufacturing method of manufacturing synchronous motors of more than one kind driven by three phase alternate current, the method comprising:
a step of forming stators;
a step of forming rotors; and
an assembly step of assembling the synchronous motors, each synchronous motor assembled by disposing a rotor inside a stator; wherein
the step of forming rotors includes:
a preparation step of preparing plate members, each plate member formed in a substantially circular shape in a plan view and formed with projections along an outer circumference;
a laminating step of forming laminated bodies, each laminated body configured by laminating a plurality of plate members so that the projections are shifted relative to one another; and
a step of fixing magnets between the projections of each laminated body; wherein
the synchronous motors of more than one kind include first synchronous motor of which the number of slots of the stator is 2xz and the number of poles of the rotor is 2(z+1)x and second synchronous motor of which the number of slots of the stator is 2xz and the number of poles of the rotor is 2(z−1)x, when variable x is a natural number and variable z is a positive multiple of 3;
the step of forming stators includes a step of forming stator cores, the number of slots of each stator core being 2xz;
the preparation step includes a step of preparing plate members, the number of projections of each plate member being a common measure of 2(z+1)x and 2(z−1)x;
the laminating step includes a step of forming first laminated body configured so that the projections are shifted relative to one another so as to form regions in which 2(z+1)x magnets are disposed and a step of forming second laminated body configured so that the projections are shifted relative to one another so as to form regions in which 2(z−1)x magnets are disposed; and
the assembly step includes a step of assembling the first synchronous motor from the rotor including the first laminated body and the stator, and a step of assembling the second synchronous motor from the rotor including the second laminated body and the stator.