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Motor and motor manufacturing apparatus

a manufacturing apparatus and motor technology, applied in the direction of manufacturing stator/rotor bodies, magnetic circuit shapes/forms/construction, manufacturing tools, etc., can solve the problems of reducing the cogging torque component caused by magnetic anisotropy and the inability to reduce the cogging torque by such methods, and achieve the effect of reducing the cogging torqu

Inactive Publication Date: 2005-10-20
FANUC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach significantly reduces the cogging torque by aligning the phases of the cogging torque to cancel each other, effectively addressing the torque ripple caused by magnetic anisotropy, while also reducing torque ripple and improving magnetic flux distribution.

Problems solved by technology

However, the cogging torque component caused by magnetic anisotropy is impossible to reduce by such methods.
Furthermore, stacking the cores while rotating them so as to obtain an almost uniform arrangement in the entire stacked core at a pitch of poles, slots, or outer shape can be also considered as means for averaging the scattering of the core thickness or the scattering caused by the core shape associated with die accuracy, but such a uniform arrangement cannot reduce the cogging torque caused by magnetic anisotropy.

Method used

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  • Motor and motor manufacturing apparatus
  • Motor and motor manufacturing apparatus
  • Motor and motor manufacturing apparatus

Examples

Experimental program
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Effect test

first embodiment

[0132] In fabricating the cores with different rolling directions, flat rolled magnetic steel sheet and strip which is a core workpiece is punched out by turning through the prescribed angle with respect to the punching die. The motor manufacturing apparatus turns the core workpiece with a feed mechanism located inside the die and forms the cores in which the rolling directions are shifted by the prescribed angle with the punching die.

[0133]FIGS. 16A and 16B illustrate the first embodiment of fabricating the cores. Referring to FIG. 16A, a core is punched out with a punching die after the rolling direction of the core workpiece has been matched with the prescribed direction (prescribed angle) with respect to the punching die. In FIG. 16A, the reference symbol 5A in figure (a2) represents a punching die. After the core 1a has been punched out with the punching die 5A, the core workpiece is turned through the prescribed angle with the feed mechanism located in the die, as shown in FIG...

second embodiment

[0134] In fabricating the cores with different rolling direction, punching is conducted by turning the punching die through the prescribed angle with respect to the rolling direction of the flat rolled magnetic steel sheets and strip which is the core workpiece. In the motor manufacturing apparatus, the punching die is turned by the feed mechanism located in the die and the cores are formed with a rolling direction shifted by the prescribed angle by the punching die.

[0135]FIGS. 17A and 17B illustrate the second embodiment of fabricating the cores. Referring to FIG. 17A, a core is punched out with a punching die after the punching die has been matched with the prescribed direction (prescribed angle) with respect to the rolling direction of the core workpiece. In FIG. 17A, the reference symbol 5A in figure (a2) represents a punching die. After the core 1a has been punched out with the punching die 5A, the punching die is turned through the prescribed angle with the feed mechanism loca...

third embodiment

[0136] In fabricating the cores with different rolling directions, a plurality of punching dies are prepared, those dies having different angles with respect to the rolling direction of the flat rolled magnetic steel sheets and strip which is the core workpiece, and the cores with different angles are punched out with those dies. The motor manufacturing apparatus comprises a plurality of punching dies with different angles with respect to the rolled steel.

[0137]FIGS. 18A and 18B illustrate the third embodiment of fabricating the cores. Referring to FIG. 18A, a core is punched out with a punching die after the punching die has been matched with the prescribed direction (prescribed angle) with respect to the rolling direction of the core workpiece. In FIGS. 18A and 18B, the reference symbols 5A and 5B in figures (a2) and (b2) represent punching dies. The punching dies 5A and 5B punch out respective cores la and form cores la which are shifted by the prescribed angle with respect to th...

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Abstract

Flat rolled magnetic steel sheets and strip or a die is turned in the press forming process. Rotor cores are stacked with turning through an angle which is an odd number multiple of about (360° / (number of slots in the motor×natural number n×2) and stator cores are stacked with turning through an angle which is an odd number multiple of (360° / (number of poles in the motor×natural number n×2)). Stacking with turning through an angle which is an odd number multiple converts the phases of cogging torques into mutually opposite phases and cancels and reduces the cogging torque caused by magnetic anisotropy.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional of U.S. application Ser. No. 10 / 792,915 filed Mar. 15, 2004 which is currently pending.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a motor and a motor manufacturing apparatus, in particular, to cogging torque reduction. [0004] 2. Description of the Related Art [0005] In motors comprising a rotor with a magnet embedded therein and a stator having slots provided equidistantly in a circumference and a coil portion formed therein by winding in the slots, those motors being rotationally driven by the torque of the magnet and the reluctance torque of the coil, when the rotor rotates, a pulsating cogging torque is generated in the rotor. [0006] When the magnet disposed inside the rotor forms a magnetic circuit in which the generated magnetic flux is closed via the slots in the stator, the total sum of electromagnetic attraction forces at a rotation angle ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02K15/00H02K15/02H02K15/03H02K21/12H02K29/03
CPCH02K15/02H02K15/024H02K15/03Y10T29/53143Y10T29/49009Y10T29/49012H02K29/03
Inventor YAMAMOTO, TOMONAGAMAEDA, TAKUYA
Owner FANUC LTD
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