Energy-saving type electric bicycle hub motor

A technology of electric bicycles and hub motors, applied in the field of electric motors, can solve the problems of motor vibration hysteresis, difficulty in limiting coil displacement, poor magnetic field concentration, etc., and achieve the effects of increasing mileage, enhancing climbing ability, and ensuring reliability

Active Publication Date: 2017-02-08
眭华兴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Patent No. 201310310431.3 discloses a disc-type coreless permanent magnet brushless DC motor, which adopts a ring-shaped coil winding similar to that of the disc-type coreless permanent magnet DC motor disclosed in Application No. 201310033295.8. The arc radius is 1.5-2 times of the arc radius near the shaft end, the arc radius of the two waistlines is 3-5 times of the arc radius away from the shaft end, the space utilization rate of the stator plate is very low, and the magnetic field concentration is even worse , and the coil winding lacks a limit device, it is difficult to limit the displacement of the coil in the axial direction; the motor of this invention adopts a disc-type coreless DC motor in which the outer rotor shell rotates, the purpose of the invention is not clear, and four O-shaped seals are set The pertinence of the ring is not strong, the motor lacks a power output device and a fixing device, and it seems inappropriate to use two kinds of bearings with different specifications on the motor shaft.

Method used

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  • Energy-saving type electric bicycle hub motor
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  • Energy-saving type electric bicycle hub motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Disk-type coreless DC motor, the winding is composed of 6 coils 20, the radial diameter of the coil 20 is D=32mm, the height is 10.0mm, the copper enameled wire diameter is 0.67mm, the radial length of the triangular hollow is 9.6mm, and 8 first The average value of the inner and outer diameters of the permanent magnet 21 unit is 68mm, the axial height is 6mm, and the radial length is 20mm. °, 41°, 38° for comparison test; Figure 11 is the torque and efficiency curve, a is the torque and efficiency curve when the central angle of the permanent magnet is 45°, b is the torque and efficiency curve when the permanent magnet central angle is 41°, c is the permanent magnet central angle is 38° When the torque and efficiency curves, from Figure 11 From the torque efficiency curve shown, the highest efficiencies of the three motors are 83.8%, 83.1%, and 80.6%, respectively. After leaving a gap between two adjacent permanent magnet units, the effect on the motor efficiency is...

Embodiment 2

[0053] Disk-type unit laminated coreless DC motor, the winding on each stator disk is composed of 6 coils 22, the radial diameter of the coil 22 is D=32mm, the height is 10.0mm, the copper enameled wire diameter is 0.60mm, and the triangular hollow radial The length is 9.6mm, the average inner and outer diameters of the 8 permanent magnet units on each rotor disk are 68mm, the axial height is 6mm, and the radial length is 20mm. : 8.74 two-stage reduction of the planetary reduction mechanism, for comparative testing; Figure 13 Middle d is the curve diagram of torque and efficiency when the first power unit works alone, e is the curve diagram of torque and efficiency when the first power unit and the second power unit work simultaneously, Figure 13 It shows the torque efficiency curve diagram when the first power unit works and the first and second units work simultaneously in this embodiment of the disc-type unit laminated coreless DC motor of the present invention. From the ...

Embodiment 3

[0055] An energy-saving electric bicycle hub motor installed on a bicycle with a front wheel opening of 100mm. The pitch circle diameter of the spoke installation hole is 143mm, and the reduction ratio of the planetary gear mechanism is 1:7.9. The sun gear ring gear and the center wheel 8 is powder metallurgy material, double structure planetary gear 9 is die-casting molding of nylon material; drive motor adopts image 3 For the disc-type ironless DC motor shown, the motor input voltage is 48V, the no-load speed of the disc motor is 2780rpm, the no-load speed of the hub motor is 348rpm, and the best efficiency point power is 240W. The side of the hub 3 of the hub motor is provided with a butterfly brake mounting hole and a solid screw 35, and a waterproof sealing ring 36 is set on the outside of the first bearing 5 and the second bearing 51 on the main shaft 2, which improves the waterproof performance of the hub motor. Such as Figure 9 As shown, the center of the planet car...

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Abstract

The invention discloses an energy-saving type electric bicycle hub motor which comprises a main shaft, a hub and an end cover. The hub sleeves the main shaft through a first bearing. The end cover sleeves the main shaft through a second bearing. The hub is connected to a sun wheel tooth ring fixed to the motor through a speed reducing mechanism. The sun wheel tooth ring is driven by the motor to rotate, and thus the hub is driven to rotate by the speed reducing mechanism. Under the premise of maintaining a through shaft structure, a two-stage speed reducing planetary gear mechanism with the engagement of a powder metallurgy gear and an engineering plastic gear is used, the reliability of the hub motor structure is ensured, the transmission noise is effectively reduced, the high speed performance of the disk type ironless DC motor can be fully played, and the continuation mileage of an electric bicycle is improved greatly according to the high efficiency characteristic of a disk type ironless motor at a low torque motor.

Description

technical field [0001] The invention relates to an energy-saving wheel hub motor of an electric bicycle, the driving motor of which is a disc-type coreless DC motor, belonging to the field of electric motors. Background technique [0002] Existing electric bicycles mostly use low-speed hub motors, which have the advantages of large motor power, generally no maintenance, and high transmission efficiency. However, due to the hysteresis resistance of such motors, the riding function of electric bicycles is weakened or even lost. Electric power-assisted bicycles have gradually embarked on a motorized and comfortable development route, and their driving motor power and driving speed far exceed the existing national standards. Motorized electric bicycles, frequent traffic accidents, have become a social problem that needs to be solved urgently. [0003] In order to overcome the hysteresis resistance of the driving motor, motor manufacturers represented by Bafang Motor have introd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K7/116H02K1/18H02K1/28
CPCH02K1/18H02K1/28H02K7/116
Inventor 眭华兴眭重兴高波高峰
Owner 眭华兴
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