Fractional slot winding for slow-run large torque moment permanent-magnet brushless motor

A permanent magnet brushless motor, high torque technology, applied to synchronous motors with stationary armatures and rotating magnets, shapes/styles/structures of winding conductors, electrical components, etc. The number of grooves is large and cannot be too many, so as to reduce the amount of iron used, the production process is simple, and the processing cost is reduced.

Active Publication Date: 2008-07-23
BEIJING ZHONG KE SAN HUAN HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the number of magnetic poles and phases increases, the number of motor slots of a certain size will increase several times. Due to the limitation of mechanical technology, the number of magnetic poles and phases cannot be too much. Therefore, the characteristics of low-speed high-torque are limited to a certain extent.
Due to the complexity of the process of traditional fractional slot windings, and the number of slots is far greater than the number of magnetic poles, fractional slot windings are mostly used in large hydroelectric generators and AC motors for special purposes, and most motors do not use them.

Method used

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  • Fractional slot winding for slow-run large torque moment permanent-magnet brushless motor
  • Fractional slot winding for slow-run large torque moment permanent-magnet brushless motor
  • Fractional slot winding for slow-run large torque moment permanent-magnet brushless motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Fractional slot windings for in-wheel motors for electric vehicles

[0042] Figure 5 It is a schematic diagram of the local structure of the electric vehicle hub motor, in which the fractional slot winding form and connection refer to image 3 As shown in Table 2, the coils of this winding are embedded in the slots of the stator core, corresponding to the magnetic poles arranged alternately on the N and S poles on the rotor. Three (that is, distribution number Q=3) series windings are distributed in the phase band to form a phase winding, and the other phase windings are arranged circularly in sequence according to the phase sequence of the motor.

[0043] The number of magnetic poles P, the number of iron core slots Z, the number of phases M, and the number of distributions Q in this embodiment satisfy the condition 1) when the number of distributions Q is an odd number, the number of iron core slots Z=Q×M×K, and the number of magnetic poles P= Z±K; where Q=1, 3, 5,...

Embodiment 2

[0046] Fractional slot windings for wind turbines

[0047] Figure 6 It is a schematic diagram of the local structure of the permanent magnet wind turbine, and the fractional slot winding form and connection refer to Figure 4 And Table 5, the coil of this winding is embedded in the slot of the stator core, corresponding to the magnetic poles arranged alternately on the N and S poles on the rotor, the winding pitch of the winding is 1 slot pitch, double-layer stacked winding, in a Four windings in series (that is, the distribution number Q=4) are distributed in the phase band to form a phase winding, and the other phase windings are arranged circularly in sequence according to the phase sequence of the motor.

[0048] The number of magnetic poles P, the number of iron core slots Z, the number of phases M, and the number of distributions Q in this embodiment satisfy the condition 2) when the number of distributions Q is an even number, the number of iron core slots Z=Q×M×K, an...

Embodiment 3

[0052] Small power permanent magnet slotless end face (plane) rotor brushless motor

[0053] Figure 7 Small power permanent magnet slotless end face (plane) rotor brushless motor winding surface schematic diagram, fractional slot winding form and connection reference image 3 And Table 2, the inner stator core 3 is made of magnetically permeable material (disc type), and the motor winding is glued on the end surface without slots, and 36 equal parts are evenly distributed on the end surface of the disc, that is, 36 virtual slots 4, each equal Parts have double-layer distributed windings. The permanent magnetic pole 2 adopts NdFeB fan-shaped magnetic steel, and the N and S magnetic poles are alternately and evenly distributed. The power of the motor is 500W, the slotless planar structure, the number of virtual slots Z = 36, the number of poles P = 32, three-phase low-speed and large-torque DC brushless motor.

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Abstract

This invention relates to permanent magnetic brushless motor division slot winding, which is imbedded into stator iron chip tank relative to the above N, S electrodes by alternating distribution with one tank distance and double layers of rolling and the magnetic electrode number and iron chip tank number Z and phase number M and distribution Q meet the following constraints: a, when q is odd, then Z=Q*M*K and P=Z+-K; b, q is even, then Z=Q*M*K and P=Z+-2K.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet brushless motors, in particular, the invention relates to fractional slot windings in which the multiphase multipole winding pitch is one slot pitch in the permanent magnet brushless motor. Background technique [0002] Brushless motor is a new type of DC motor developed with the rapid development of electronic technology in the 1950s. Its excellent characteristics are also revealed in the direct drive system. The winding of the brushless motor usually adopts a three-phase star winding, the minimum number of magnetic poles is 2 poles, and the corresponding number of slots is at least 6 slots, if it is 4 poles, it is 12 slots, etc., that is, the number of slots is usually 3 of the magnetic poles. (number of phases) times (Ye Jinhu et al: "Brushless DC Motor", Science Press (First Edition) 1982.1, pp 17-20); in low-speed brushless motor systems, most of them adopt multi-pole structure or m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K3/12H02K3/28H02K1/27H02K21/12H02K29/00
Inventor 王玉国贾敬东
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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