# US 10,122,232 B2 · Rotary electric machine

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- Number: US 10,122,232 B2
- Document ID: US10122232B2
- Status: Granted
- Kind: B2
- Application number: 15/053,018
- Filed: 2016-02-25
- Published: 2016-09-29
- Granted: 2018-11-06
- Earliest claimed: 2015-03-27
- Assignees: Aisin Seiki Kabushiki Kaisha
- Applicants: Aisin Seiki Kabushiki Kaisha
- Inventors: Masafumi Sakuma; Teppei Tsuda
- Web page: https://patentgrep.com/patent/US10122232B2

## CPC

- H02K 3/28: Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32)
- H02K 21/14: with magnets rotating within the armatures
- H02K 29/03: with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
- H02K 2201/06: Magnetic cores, or permanent magnets characterised by their skew
- H02K 2201/15: Sectional machines
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A rotary electric machine includes a stator including a stator winding and a rotor movable relative to the stator in a first direction and arranged to face the stator in a second direction, the rotor including plural pairs of rotor poles at a rotor core, each pair of the plural pairs of rotor poles including different polarities from each other, the stator including a fractional slot configuration where the number of slots per pole per phase is a non-integer, the stator winding being wound by a fractional slot winding, one of a stator core and the rotor core including a base portion and either a single position portion or plural position portions which is connected to the base portion in a third direction and which is displaced relative to the base portion in the first direction, the third direction being orthogonal to the first direction and the second direction.

## Claims

### Claim 1

A rotary electric machine comprising:
a stator including a stator winding which is inserted to be positioned within a plurality of slots formed at a stator core; and
a rotor supported at the stator to be movable relative to the stator in a first direction and arranged to face the stator in a second direction, the rotor including a plurality of pairs of rotor poles at a rotor core, each pair of the plurality of pairs of rotor poles including different polarities from each other, wherein
the stator includes a fractional slot configuration where the number of slots per pole per phase is a non-integer,
the stator winding is wound by a fractional slot winding,
one of the stator core and the rotor core includes a base portion and either a single position portion or a plurality of position portions which is connected to the base portion in a third direction and which is displaced relative to the base portion in the first direction, the third direction being orthogonal to the first direction and the second direction,
either the single position portion or the plurality of position portions obtains a first average skew amount Sav1 serving as an average skew amount relative to the base portion for reducing at least one of a noise and a vibration that occurs at a driving of the rotary electric machine,
the first average skew amount Sav1 in a case where a lamination thickness of the base portion in the third direction and a lamination thickness of either the single position portion or the plurality of position portions in the third direction are the same as one another is expressed by a formula 1:
Sav1=(c−1)/(2×d) (Formula 1)
where c is a denominator part of an irreducible fraction representing a proper fraction part of a mixed fraction by which the number of slots per pole per phase is expressed, the mixed fraction including an integer part a and the irreducible fraction including a numerator part b,
where d is a skew amount specifying portion serving as an integer equal to or greater than the denominator part c, a reciprocal of the skew amount specifying portion d indicating a skew amount in a stator pole pitch,
the first average skew amount Sav1 is calculated in a state where a skew amount of the base portion is specified to be zero and the value zero of the skew amount of the base portion is included for the calculation, the first average skew amount Sav1 serving as an average skew amount in the stator pole pitch, and
the integer part a, the numerator part b and the denominator part c are positive integers, the denominator part c being equal to or greater than two and inhibited from being a multiple of three.

### Claim 2 (depends on 1)

The rotary electric machine according to claim 1, wherein a sum of skew amounts between adjacent portions including the base portion and the plurality of position portions is minimum under a condition where a skew amount of each of the position portions is the same.

### Claim 3 (depends on 1)

The rotary electric machine according to claim 1, wherein skew amounts of the base portion and either the single position portion or the plurality of position portions in a case where the skew amount of the base portion is specified to be zero is represented by an arithmetic progression as 0, 1/d, . . . and (c−1)/d in order from one of the base portion and either the single position portion or the plurality of position portions disposed at an end side in the third direction.

### Claim 4 (depends on 1)

The rotary electric machine according to claim 1, wherein the skew amount specifying portion d is specified to be the same value as the denominator c.

### Claim 5 (depends on 1)

The rotary electric machine according to claim 1, wherein
either the single position portion or the plurality of position portions obtains a second average skew amount Sav2 serving as an average skew amount relative to the base portion for reducing a torque ripple of the rotary electric machine,
the second average skew amount Sav2 in a case where a lamination thickness of the base portion in the third direction and a lamination thickness of either the single position portion or the plurality of position portions in the third direction are the same as one another is expressed by a formula 2:
Sav2=1/(2×d) (Formula 2)
the second average skew amount Sav2 is calculated in a state where a skew amount of the base portion is specified to be zero and the value zero of the skew amount of the base portion is included for the calculation, the second average skew amount Sav2 serving as the average skew amount in the stator pole pitch, and
the integer part a, the numerator part b and the denominator part c are positive integers, the denominator part c being equal to or greater than two and inhibited from being a multiple of three.

### Claim 6 (depends on 5)

The rotary electric machine according to claim 5, wherein skew amounts of the base portion and the single position portion in a case where the skew amount of the base portion is specified to be zero is represented as 0 and 1/d.

### Claim 7 (depends on 6)

The rotary electric machine according to claim 6, wherein the skew amount specifying portion d is specified to be two times of the denominator part c.

### Claim 8 (depends on 1)

The rotary electric machine according to claim 1, wherein
the plurality of position portions obtains a third average skew amount Sav3 serving as an average skew amount relative to the base portion for reducing at least one of a noise and a vibration that occurs at the driving of the rotary electric machine and for reducing a torque ripple of the rotary electric machine,
the third average skew amount Sav3 in a case where the lamination thickness of the base portion in the third direction and a lamination thickness of the plurality of position portions in the third direction are the same as one another is expressed by a formula 3:
Sav3=(c−1)/(2×c)=1/(4×c) (Formula 3)
the third average skew amount Sav3 is calculated in a state where a skew amount of the base portion is specified to be zero and the value zero of the skew amount of the base portion is included for the calculation, the third average skew amount Sav3 serving as the average skew amount in the stator pole pitch, and
the integer part a, the numerator part b and the denominator part c are positive integers, the denominator part c being equal to or greater than two and inhibited from being a multiple of three.

### Claim 9 (depends on 8)

The rotary electric machine according to claim 8, wherein skew amounts of the base portion and the plurality of position portions in a case where the skew amount of the base portion is specified to be zero is represented by a combination of a first group of skew amounts and a second group of skew amounts, the first group of skew amounts being represented by an arithmetic progression as 0, 1/c, . . . and (c−1)/c in an ascending order, the second group of skew amounts being represented by the arithmetic progression as 1/(2×c), 3/(2×c), . . . and (2×c−1)/(2×c) in the ascending order.

### Claim 10 (depends on 8)

The rotary electric machine according to claim 8, wherein a sum of skew amounts between adjacent portions including the base portion and the plurality of position portions is minimum under a condition where the number of the position portions is the same.

### Claim 11 (depends on 8)

The rotary electric machine according to claim 8, wherein the number of terms represented by 1/c in the stator pole pitch for reducing at least one of the noise and the vibration that occurs at the driving of the rotary electric machine included in the skew amounts between adjacent portions including the base portion and the plurality of position portions is maximum under a condition where the number of the plurality of position portions is the same.