Brush DC motors and AC commutator motor structures with concentrated windings

• US 20050184612A1
• Filed: 04/29/2005
• Published: 08/25/2005
• Est. Priority Date: 09/06/2000
• Status: Active Grant

• Current Assignee: Jerome Cros, Philippe Viarouge
• Original Assignee: Jerome Cros, Philippe Viarouge
• Inventors: Viarouge, Philippe, Cros, Jerome
• Granted Patent: US 7,239,060 B2
• Time in Patent Office: Days
• US Class Current: 310/158
• CPC Class Codes: H02K 1/146 consisting of a generally annular yoke with salient poles
• CPC Class Codes: H02K 21/16 having annular armature cores with salient poles with homopolar co-operation H02K21/20
• CPC Class Codes: H02K 23/30 having lap or loop windings
• CPC Class Codes: H02K 3/18 Windings for salient poles
• CPC Class Codes: H02K 3/28 Layout of windings or of connections between windings windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32
• CPC Class Codes: Y10T 29/49012 Rotor

Abstract

Structures of direct current motors or ac commutator (Universal) motors which use a concentrated winding on the rotor with coils wound around the teeth. The number of commutator segments is higher than the number of rotor teeth. Several coils are wound around the same tooth. The terminals of the coils are connected to different segments of the commutator. The parallel paths of the armature winding are perfectly balanced. An equal current distribution through the parallel circuits of the armature is maintained and there is no circulation current between these parallel circuits. The problems related to commutation are reduced because the value of the coil inductances is low. The copper volume of the end-windings, the Joule losses and the axial length of the motor armature are lower than a lap or a wave winding with interlocked coils. Two kinds of structures with a concentrated winding are presented: some with rotor teeth with identical dimensions and some with rotor teeth with different dimensions.

Claims

1-4. -4. (canceled)

5. A direct current motor comprising:

a stator with 2P poles;

a rotor core including a core of ferromagnetic material having S slots and S teeth separated from the stator core by an airgap;

a rotor core having a plurality of teeth, each tooth having the same geometrical dimensions;

a concentrated winding rotor with a plurality of coils of insulated wire being wound around each rotor tooth;

a commutator with a number of segments Z;

wherein the number of stator poles 2P, the number of rotor slots S and the number of segments on the commutator Z satisfy the following conditions;

P is an integer and0 <

P <

10S = 2P + AA is an integer equal to −

1 or 1 or 2 or 3 or 4S >

2Z = k*LCM(S, 2P) ±

nk is an integer greater than 0LCM is the Least Common Multiple of Sand 2P n is equal to 0 or korZ = LCM(S, 2P)/2and  

Z/2P >

3

6. The direct current motor of claim 5, wherein each pole comprises a permanent magnet mounted on the surface of a core of a ferromagnetic material.

7. The direct current motor of claim 5, wherein each pole comprises a coil wound around a tooth made of a ferromagnetic material.

8. An AC commutator (Universal) motor comprising:

a stator with 2P poles, each comprising a coil wound around the tooth of a core of a ferromagnetic material;

a rotor core including a core of ferromagnetic material having S slots and S teeth separated from the stator core by an airgap, wherein each tooth has the same geometrical dimensions;

a concentrated winding rotor having a plurality of insulated wire coils being wound around each rotor tooth;

a commutator with a number of segments Z;

wherein the number of stator poles 2P, the number of rotor slots S and the number of segments on the commutator Z satisfy the following conditions;

P is an integer and0 <

P <

10S = 2P + AA is an integer equal to −

1 or 1 or 2 or 3 or 4S >

2Z = k*LCM(S, 2P) ±

nk is an integer greater than 0LCM is the Least CommonMultiple of S and 2Pn is equal to 0 or korZ = LCM(S, 2P)/2and  

Z/2P >

3

9. A direct current motor comprising:

a stator with 2P poles;

a rotor core including a core of ferromagnetic material having S lots and S teeth separated from the stator core by an airgap;

wherein S/2 of the teeth have different geometrical dimensions from the remaining teeth;

a concentrated winding rotor having a plurality of coils of insulated wire being wound around S/2 of the rotor teeth;

a commutator with a number of segments Z;

wherein the number of stator notes 2P, the number of rotor slots S and the number of segments on the commutator Z to satisfy the following conditions;

P is an integer and1 <

P <

10S = 2P + 2AA is an integer and 1 <

A <

PZ = k*LCM(S/2, 2P) ±

n 

k is an integer greater than 0LCM is the Least Common Multiple ofS/2 and 2Pn is equal to 0 or korZ = LCM(S/2, 2P)/2

10. The direct current motor as in claim 9, wherein each pole comprises a permanent magnet mounted on the surface of a core of a ferromagnetic material.

11. The direct current motor as in claim 9, wherein each pole comprises a coil wound around a tooth made of a ferromagnetic material.

12. An AC commutator (Universal) motor comprising:

a stator with 2P poles;

a rotor core including a core of ferromagnetic material having S slots and S teeth separated from the stator core by an airgap,

wherein S/2 teeth have different geometrical dimensions from the remaining teeth;

a concentrated winding rotor having a plurality of coils of insulated wire being wound around S/2 rotor teeth;

a commutator with a number of segments Z;

wherein the number of stator poles 2P, the number of rotor slots S and the number of segments on the commutator Z to satisfy the following conditions;

P is an integer and1 <

P <

10S = 2P + 2AA is an integer and 1 <

A <

PZ = k*LCM(S/2, 2P) ±

nk is an integer greater than 0LCM is the Least Common Multiple ofS/2 and 2Pn is equal to 0 or korZ = LCM(S/2, 2P)/2

13. The AC commutator (Universal) motor as in claim 12, wherein each pole comprises a permanent magnet mounted on the surface of a core of a ferromagnetic material.

14. The AC commutator (Universal) motor as in clam 12, wherein each pole comprises a coil wound around a tooth made of a ferromagnetic material.

15-28. -28. (canceled)