JP2007151253A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the matter of a flat motor that the inductance varies among phases due to the dispersion in the magnetic reluctance, and to enhance controllability and starting characteristics, so as to adjust the teeth width and the yoke width to make the magnetic reluctance equal among all phases and to reduce the dispersion in the inductance. <P>SOLUTION: Assuming the teeth width provided in an arcuate yoke to be S1, the teeth length provided in the arcuate yoke to be L1, the teeth width provided in a linear yoke to be S2, the teeth length provided in the linear yoke to be L2, the arcuate yoke width to be S3, the arcuate yoke length to be L3, the linear yoke width to be S4, and the linear yoke length to be L4, S1-S4 and L1-L4 are set, such that R1 and R2 are equal, where R1=L1/S1+L3/S3+L2/S2 is the magnetic reluctance from a teeth, provided in the arcuate yoke to a teeth provided in the linear yoke, and R2=R1=L2/S2+L4/S4+L2/S2 is the magnetic reluctance from a teeth provided in the linear yoke to a teeth provided in the linear yoke. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

  A conventional motor is shown in FIGS.

  FIG. 5 shows a conventional round concentrated winding motor, which includes a stator 101 and a rotor 102. FIG. 5 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 formed 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. 5 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. 6 (see, for example, Patent Document 1).

The teeth of the flat brushless motor shown in FIG. 6 are arranged in parallel, but the flat brushless motor shown in FIG. 7 is also conceivable in order to reduce cogging torque. A stator 113 of the flat brushless motor shown in FIG. 7 has 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 are alternately joined, 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, it is possible to provide a brushless motor that is small and has high output. However, in the stator shape, since the lengths of the teeth are different in each phase, the magnetic resistance varies, resulting in a decrease in controllability and startability.
JP 2002-136090 A

  In the flat brushless motor, the inductance varies from phase to phase due to variations in magnetic resistance, resulting in a decrease in controllability and startability.

  In order to solve the above problems, the present invention reduces the variation in inductance and improves the controllability and startability of the motor by adjusting the teeth width and the yoke width so that the magnetic resistance is the same in each phase. .

  It is possible to provide a motor having high controllability and high startability by reducing variation in inductance without increasing the cogging torque and without causing a decrease in output.

  Slots provided between a plurality of teeth arranged substantially radially, a yoke for connecting the teeth at the outer periphery, a wide tip portion of the teeth provided at the tip of the teeth, and a wide portion of the adjacent tips of the teeth 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. The two linear yokes are parallel to each other, and the outer shape of the stator core is a flat shape. The tooth width provided on the linear yoke is S1, the teeth length provided on the arcuate yoke is L1, the teeth width provided on the linear yoke is S2, and the teeth length provided on the linear yoke is L2. When the arcuate yoke width is S3, the arcuate yoke length is L3, the linear yoke width is S4, and the linear yoke length is L4, the teeth are provided from the teeth provided on the arcuate yoke. The magnetic resistance R1 that passes through the yoke and reaches the teeth provided with the linear yoke is R1 = L1 / S1 + L3 / S3 + L2 / S2, and the teeth provided in the linear yoke pass through the linear yoke and pass through the linear yoke. The magnetic resistance R2 reaching the teeth provided on the yoke is R2 = R1 = L2 / S2 + L4 / S4 + L2 / S2, and the magnetic resistances R1 and R2 are As will properly, and sets the L4 from the S4, L1 S1.

  FIG. 1 shows a concentrated winding brushless motor to which a first embodiment of the present invention is applied. As shown in FIG. 1, the motor of the present invention includes a stator 10 and a rotor 30, and the stator 10 is an arcuate yoke 12 provided on the stator core 11 and a linear yoke with both ends of a substantially annular shape cut off. 13, a tooth 14 provided at the center of the yoke 12 on the arc, and a tooth 15 provided on the linear yoke 13. Further, the teeth tip wide portion 16 which is wide in the rotation direction is provided at the tips on the inner diameter side of the teeth 14 and 15, the slot open 17 is between the adjacent teeth tip wide portions, and the slot 18 is between the adjacent teeth. And a slot 19. Each tooth is provided with a winding, and the winding is usually a three-phase winding.

  The width of the teeth 14 is S1, the length is L1, the width of the teeth 15 is S2, and the length is L2. In addition, when the width of the yoke 12 is S3, the length is L3, the width of the yoke 13 is S4, and the length is L4, the magnetic resistance R1 is represented by R1 = L1 / S1 + L3 / S3 + L2 / S2. The magnetic resistance R2 is represented by R2 = R1 = L2 / S2 + L4 / S4 + L2 / S2. By setting S1 to S4 and L1 to L4 so that the magnetic resistances R1 and R2 are equal, the magnetic resistances are equal, and variation in inductance can be reduced.

  FIG. 2 shows a comparison between the inductance of a conventional flat motor and the inductance of a flat motor to which the present invention is applied. From FIG. 2, it can be confirmed that the conventional flat motor inductance is improved by the present invention.

  Further, FIGS. 3 and 4 show the cogging torque and the induced voltage waveform. From FIG. 3, it can be confirmed that the cogging torque is not affected even when the present invention is applied. Further, as shown in FIG. 4, the induced voltage waveform is not affected.

  As described above, since the variation in inductance can be improved, a motor with high controllability and startability can be provided.

  In the case where the width of the yoke 12 in FIG. 1 is S3 and the width of the yoke 13 is S4, the magnetic resistances R1 and R2 are R1 = L1 / S1 + L3 / S3 + L2 / S2, R2 = R1 = L2 / S2 + L4 / S4 + L2 / Since it is represented by S2, by setting S1 to S4 and L1 to L4 so that the magnetic resistances R1 and R2 are equal, the magnetic resistance can be made equal, and variation in inductance can be reduced. Is possible.

  In the case where the width of the tooth 14 in FIG. 1 is S1 and the width of the tooth 15 is S2, the magnetic resistances R1 and R2 are R1 = L1 / S1 + L3 / S3 + L2 / S2, R2 = R1 = L2 / S2 + L4 / S4 + L2 / Since it is represented by S2, by setting S1 to S4 and L1 to L4 so that the magnetic resistances R1 and R2 are equal, the magnetic resistance can be made equal, and variation in inductance can be reduced. Is possible.

  Even when the stator 10 of FIG. 1 is divided or when the divided portions are in surface contact, the magnetic resistances R1 and R2 are set to be equal by setting S1 to S4 and L1 to L4. The resistance becomes equal and the variation in inductance can be reduced.

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

Sectional drawing of the motor in Example 1 of this invention Graph showing a comparison of inductance between a conventional flat motor and a flat motor to which the present invention is applied A graph showing a comparison of cogging torque between a conventional flat motor and a flat motor to which the present invention is applied The graph which shows the comparison of the induced voltage of the conventional flat motor and the flat motor which applied this invention Cross section of conventional round motor Sectional view of a conventional flat motor Sectional view of a conventional flat motor

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Stator 11 Stator iron core 12 Arc-shaped yoke 13 Linear yoke 14 Arc portion teeth 15 Flat portion teeth 16 Teeth tip wide portion 17 Slot open 18 Slot 19 Flat portion slot L1 14 length L2 15 length L3 12 length L4 13 Length S1 14 Width S2 15 Width S3 12 Width S4 13 Width 101 Round Stator 102 Rotor 103 Teeth 104 Arc-shaped Yoke 105 Teeth Tip Wide Part 106 Slot Open 107 Slot 108 Insulator 109 Winding 110 Rotor core 111 Permanent magnet 112 Shaft 113 Flat stator 114 Linear yoke

Claims (6)

Slots provided between a plurality of teeth arranged substantially radially, a yoke for connecting the teeth at the outer periphery, a wide tip portion of the teeth provided at the tip of the teeth, and a wide portion of the adjacent tips of the teeth 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. The two linear yokes are parallel to each other, and the outer shape of the stator core is a flat shape. The tooth width provided on the linear yoke is S1, the teeth length provided on the arcuate yoke is L1, the teeth width provided on the linear yoke is S2, and the teeth length provided on the linear yoke is L2. When the arcuate yoke width is S3, the arcuate yoke length is L3, the linear yoke width is S4, and the linear yoke length is L4, the teeth are provided from the teeth provided on the arcuate yoke. The magnetic resistance R1 that passes through the yoke and reaches the teeth provided with the linear yoke is R1 = L1 / S1 + L3 / S3 + L2 / S2, and the teeth provided in the linear yoke pass through the linear yoke and pass through the linear yoke. The magnetic resistance R2 reaching the teeth provided on the yoke is R2 = R1 = L2 / S2 + L4 / S4 + L2 / S2, and the magnetic resistances R1 and R2 are As will properly, motor with and sets the L4 from the S4, L1 S1. The motor according to claim 1, wherein the arc-shaped yoke and the linear yoke have different widths. The motor according to claim 1, wherein the width of at least one of the teeth is different. The motor according to any one of claims 1 to 3, wherein the stator core is divided into two core pieces by a core dividing portion provided in the linear yoke. The stator core is divided into two core pieces by a core dividing portion provided in the linear yoke, and the two core pieces are assembled so as to form a magnetic circuit completely in surface contact. The motor according to claim 4. A device on which the motor according to any one of claims 1 to 5 is mounted.

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