JP4760286B2 - motor - Google Patents

Description

  The present invention relates to a motor and a device equipped with the motor.

  A conventional motor is shown in FIGS.

  FIG. 9 shows a conventional round concentrated winding motor, which includes a stator 101 and a rotor 102. FIG. 9 shows an example of an 8-pole 6-slot permanent magnet motor.

  The stator 101 includes a plurality of teeth 103 arranged substantially radially and a substantially arcuate yoke 104 connecting the teeth. A tooth tip wide portion 105 that is wide in the rotation direction is provided at the tip on the inner diameter side of the tooth 103, a slot open 106 is provided between adjacent tooth tip wide portions, and a slot 107 is provided between adjacent teeth. The teeth 103 are provided with a winding 109 via an insulator 108. As the winding 109, a three-phase winding is usually applied.

  The rotor 102 is rotatably held concentrically with the stator 101 inside the stator 101. FIG. 9 shows a rotor in which a ring-shaped permanent magnet 111 is attached to the rotor core 110. A shaft is inserted into the shaft hole 112.

  The rotor 102 rotates around the axis by a magnetic field generated by a current flowing in the winding 109 applied to the stator 101.

As a method for obtaining a high output when the brushless motor is downsized, there is a flat brushless motor shown in FIG. The stator 113 includes a plurality of teeth 103 arranged substantially radially, an arcuate yoke 104 connecting the teeth at the outer peripheral portion, and a linear yoke 114, and the arcuate yoke and the linear yoke The yokes are joined alternately, and the two linear yokes are joined so as to be parallel to each other, thereby forming a flat shape. By adopting this flat shape, a brushless motor that is small and has high output can be provided (see, for example, Patent Documents 1, 2, 3, and 4).
U.S. Pat. No. 4,181,868 US Pat. No. 5,729,071 US Pat. No. 6,043,574 US Pat. No. 6,342,746

  In the flat brushless motor, it is necessary to divide the stator core as shown in FIG. 11 in order to simplify the winding assembly. FIG. 11 shows an example in which the linear yoke portion is divided into two parts.

  When constructing a motor, it is necessary to connect the two divided core pieces and incorporate them into the frame. At this time, if there is a clearance between the two core pieces or contact is incomplete. There is a problem in that the magnetic circuit is not completely configured between the two core pieces, so that the output is reduced or the cogging torque is increased.

According to the present invention, the shape of the stator core dividing portion is made to prevent the contact between the two core pieces from becoming incomplete, so that a magnetic circuit is completely formed between the two core pieces, thereby increasing the cogging torque. Another object of the present invention is to provide a split-shaped motor that simplifies winding assembly without reducing output.

  In order to solve the above-mentioned problems, the present invention eliminates the clearance between the core pieces in order to form a complete magnetic circuit by forming the shape so that the contact between the two core pieces is not incomplete, and the cogging torque. A motor that prevents an increase and a decrease in output can be obtained.

  According to the invention of the present application, since a magnetic circuit is completely configured between two divided core pieces, a split-shaped motor that simplifies winding assembly without increasing cogging torque or reducing output is provided. I can do it.

Slots provided between a plurality of teeth arranged substantially radially, a yoke connecting the teeth at the outer periphery, a wide tip portion of the tooth provided at the tip of the tooth, and a wide portion of the adjacent tip of the tooth A stator core having an open, a stator composed of a three-phase winding applied to the teeth via an insulator, and rotatably held facing the stator inner periphery with a slight gap, In a motor constituted by a rotor having at least a permanent magnet magnetized with a plurality of poles, the yoke has two arcuate yokes having a substantially arc shape and two linear yokes having a substantially linear shape. Since the two linear yokes are parallel to each other, the outer shape of the stator core is a flat shape, and Stator core is divided into two core pieces in the core division portion provided in the linear yokes, each of said core pieces has one of the teeth in the center of the arc-shaped yoke, the linear yoke Each side has one tooth, and the core splitting part has a shape that completely forms a magnetic circuit without any clearance between the two core pieces, so it is possible to prevent output reduction and cogging increase. It becomes.

  FIG. 1 shows a stator of a flat split type concentrated winding brushless motor to which a first embodiment of the present invention is applied. The motor of the present invention comprises a stator 1 and a rotor as shown in FIG. FIG. 1 shows a stator used for an 8-pole 6-slot permanent magnet type motor as an example.

  The stator 1 includes a plurality of teeth 2 arranged in a substantially radial manner and a yoke that connects the teeth. The yoke is formed by alternately joining two arcuate yokes 3 having a substantially arc shape and two linear yokes 4 having a substantially linear shape, and the two linear yokes are By being parallel to each other, the outer peripheral shape of the stator core is flat, and the stator core is divided into two core pieces by a core dividing portion provided in the linear yoke. The linear yoke tip portion 5 is formed only in the radial direction of the core dividing portion in order to minimize a decrease in the winding area of the linear yoke portion and prevent an increase in magnetic resistance when the two core pieces are brought into contact with each other. The width is wide on the inner circumference side. Further, a tooth tip wide portion 6 that is wide in the rotation direction is provided at the tip on the inner diameter side of the tooth 3, a slot open 7 is provided between adjacent tooth tip wide portions, and a slot 8 is provided between adjacent teeth. Teeth 3 is wound with an insulating material. As the winding, a three-phase winding is usually applied.

  The rotor is rotatably held concentrically with the stator 1 inside the stator 1, and rotates about an axis by a magnetic field generated by a current flowing through a winding applied to the stator 1.

  2 to 4 show a concentrated winding type brushless motor to which a second embodiment of the present invention is applied. The motor shown in FIG. 2 is characterized in that the shape of the dividing portion of the linear yoke 21 is such that one 22 is substantially concave in the width direction and the other 23 is substantially convex. 3 is characterized in that the divided portion shape 32 of the linear yoke 31 is wedge-shaped, and the motor of FIG. 4 is characterized in that the divided portion shape 42 of the linear yoke 41 is waved. It is said. Each of the cores shown in FIGS. 2 to 4 can have a structure in which a magnetic circuit is completely constructed by closely contacting the cores and eliminating the clearance between the cores when joining the two core pieces. It is possible to realize a motor that prevents output decrease and cogging increase due to the above.

  FIGS. 5 to 6 show a concentrated winding type brushless motor to which the third embodiment of the present invention is applied. The motor shown in FIG. 5 is characterized in that the shape of the dividing portion of the linear yoke 51 is such that one 52 is substantially concave in the stacking direction and the other 53 is substantially convex. Is characterized in that the divided portion shape 62 of the linear yoke 61 is wedge-shaped. In any shape, when two core pieces are joined, the cores are brought into close contact with each other and the clearance between the cores is eliminated, so that a complete magnetic circuit can be constructed, preventing output reduction and cogging increase due to division. A motor can be realized.

  FIGS. 7 to 8 show a concentrated winding type brushless motor to which the fourth embodiment of the present invention is applied. The motor of FIG. 7 is characterized in that a stator core is configured by laminating two types of thin steel plates having different lengths in the direction of the tip of the linear yoke 71. The motor of FIG. Two types of thin steel plates having different lengths in the distal direction are featured so that the length is alternated every other sheet in the stacking direction. In any shape, when two core pieces are joined, the cores are brought into close contact with each other and the clearance between the cores is eliminated, so that a complete magnetic circuit can be constructed, preventing output reduction and cogging increase due to division. A motor can be realized.

  INDUSTRIAL APPLICABILITY The present invention is effective for motors that are small and have limited space, such as home appliances and electrical components, and that require high output.

Sectional drawing of the motor in Example 1 of this invention Sectional drawing of the motor 1 in Example 2 of this invention Sectional drawing of the motor 2 in Example 2 of this invention Sectional drawing of the motor 3 in Example 2 of this invention Sectional drawing of the motor 1 in Example 3 of this invention Sectional drawing of the motor 2 in Example 3 of this invention Sectional drawing of the motor 1 in Example 4 of this invention Sectional drawing of the motor 2 in Example 4 of this invention Cross section of conventional round motor Sectional view of a conventional flat motor Sectional view of a conventional split flat motor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flat division type stator 2 Teeth 3 Arc-shaped yoke 4 Linear yoke 5 Linear yoke front-end | tip part 6 Teeth front-end | tip wide part 7 Slot open 8 Slot 21 Linear yoke 22 Linear yoke front-end | tip part (concave shape)
23 Straight yoke tip (convex)
31 Linear Yoke 32 Linear Yoke Tip 41 Linear Yoke 42 Linear Yoke Tip 51 Linear Yoke 52 Linear Yoke Tip (concave)
53 Straight yoke tip (convex)
61 Linear yoke 62 Linear yoke tip 71 Linear yoke 81 Linear yoke 101 Round stator 102 Rotor 103 Teeth 104 Arc shaped yoke 105 Teeth tip wide portion 106 Slot open 107 Slot 108 Insulator 109 Winding 110 Rotor core 111 Permanent Magnet 112 Shaft 113 Flat type stator 114 Linear yoke 115 Split flat type stator

Claims (10)

Six teeth arranged substantially radially, a yoke connecting the teeth at the outer periphery, a wide tip portion of the tooth provided at the tip of the tooth, and a wide portion of the adjacent tip of the tooth are provided. A stator core having a slot open, a stator composed of a three-phase winding applied to the teeth via an insulator, and rotatably held facing the stator inner periphery with a slight gap. In the motor composed of a rotor having at least permanent magnets magnetized on a plurality of poles, the yoke has two arc-shaped yokes having a substantially arc shape, and two linear yokes having a substantially linear shape; Are formed by alternately joining, and the two linear yokes are parallel to each other, whereby the outer peripheral shape of the stator core is a flat shape, Stator core is divided into two core pieces in the core division portion provided in the linear yoke,
The stator core has two teeth provided at the center of the arcuate yoke and four teeth provided on the linear yoke, and the teeth provided on the linear yoke are formed in the arcuate shape. Shorter than the teeth on the yoke,
The shape of the two end portions of one core piece is different from each other, and by assembling the two core pieces , the two core pieces are in surface contact with each other at the core dividing portion to completely form a magnetic circuit. A flat type brushless motor. 2. The motor according to claim 1 , wherein the core dividing portions have different widthwise shapes, and the two core pieces are in close contact with each other. The motor according to claim 2 , wherein a concave core end portion that is substantially concave in a width direction of the yoke and a substantially convex convex core end portion are in close contact with each other at the core split portion. . 3. The motor according to claim 2 , wherein two core pieces are coupled together by the wedge-shaped core dividing portion. 3. The motor according to claim 2 , wherein two core pieces are joined together by the corrugated shape of the core dividing portion. 4. 2. The motor according to claim 1 , wherein the core dividing portions have different thickness-direction shapes, and the two core pieces are in close contact with each other. A concave laminated core end is generally concave in laminated thickness direction of the yoke, and a generally convex convex laminated core end to claim 6 characterized in that the close proximity to each other in the core division unit The motor described. The motor according to claim 6 , wherein the stator core is configured by laminating a plurality of thin steel plates having different lengths in a tip direction of the core piece end portion. The motor according to claim 8 , wherein the stator core is configured by laminating two types of thin steel plates having different lengths in the distal direction of the core piece end. Thin steel sheet 2 kinds of different lengths in the direction of the front end of the core piece end, with respect to laminated thickness direction, to claim 8 characterized in that length in one every are stacked so as to be staggered The motor described.