Brush DC motors and AC commutator motor structures with concentrated windings

• US 7,239,060 B2
• Filed: 04/29/2005
• Issued: 07/03/2007
• Est. Priority Date: 09/06/2000
• Status: Expired due to Fees

• Current Assignee: Quebec Metal Powders Limited
• Original Assignee: Quebec Metal Powders Limited
• Inventors: Viarouge, Philippe, Cros, Jerome
• Primary Examiner(s): TAMAI, KARL I
• Application Number:
  US11/117,356
• Publication Number:
  US 20050184612A1
• Time in Patent Office: 795 Days
• Field of Search: 310/158, 310/198, 310/234, 310/207, 310/184, 310/269, 310/204, 310/40.MM, 3101541-15449, 310/44, 310/136, 310/148
• US Class Current: 310/198
• 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. A direct current (DC) motor comprising:

a stator, including a number of poles 2P and a stator core;

a concentrated-winding rotor, including;

a rotor core made of a ferromagnetic material and separated from the stator core by an airgap,

a number of rotor slots S, and

a number of rotor teeth S, wherein S/2 of the rotor teeth have different geometrical dimensions from other remaining ones of the rotor teeth, and wherein, for each tooth of the S/2 of the rotor teeth, a plurality of non-overlapping coils of insulated wire is wound around the tooth; and

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 commutator segments Z to satisfy the following conditions;

P is an integer and 1 <

P <

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

A <

P Z = k*LCM(S/2, 2P) ±

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

2. The direct current (DC) motor as in claim 1, wherein each stator pole comprises a permanent magnet mounted on a surface of a core made of a ferromagnetic material.

3. The direct current (DC) motor as in claim 1, wherein each stator pole comprises a coil wound around a tooth made of a ferromagnetic material.

4. An AC commutator (Universal) motor comprising:

a stator, including a number of poles 2P and a stator core, each pole comprising a coil wound around a tooth of a stator core made of a ferromagnetic material;

a concentrated-winding rotor, including;

a rotor core made of a ferromagnetic material and separated from the stator core by an airgap,

a number of rotor slots S, and

a number of rotor teeth S, wherein S/2 of the rotor teeth have different geometrical dimensions from other remaining ones of the rotor teeth, and wherein, for each tooth of the S/2 of the rotor teeth, a plurality of non-overlapping coils of insulated wire is wound around the tooth; and

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 commutator segments Z satisfy the following conditions;

P is an integer and 1 <

P <

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

A <

P Z = k*LCM(S/2, 2P) ±

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

5. The AC commutator (Universal) motor as in claim 4, wherein each stator pole comprises a permanent magnet mounted on surface of a core made of a ferromagnetic material.

6. The AC commutator (Universal) motor as in claim 4, wherein each stator pole comprises a coil wound around a tooth made of a ferromagnetic material.