Hub motor

Abstract

The utility model provides a wheel hub motor, which comprises a main shaft and a wheel hub shell rotationally arranged on the main shaft through a bearing, two ends of the main shaft extend out of the wheel hub shell and serve as connecting ends of a frame, and the end part of each connecting end is provided with an external thread; a stator and a rotor capable of rotating around the stator are arranged in the hub shell, iron cores of the stator and / or the rotor are made of amorphous materials, the stator is fixed to the main shaft, and a planetary speed reduction assembly is arranged between the rotor and the hub shell and can drive the hub shell to rotate. The transmission ratio of the planetary speed reduction assembly is larger than or equal to 6 and smaller than or equal to 14. The novel hub motor is compact in structure, small in size, high in motor efficiency, large in efficiency platform interval and good in using effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of motor, in particular to a kind of wheel hub motor. BACKGROUND

[0002] Electric moped is constituted by adding a set of driving motor on the basis of ordinary bicycle, driving motor is powered by battery installed on frame, driving motor rotation drives the travel of electric moped, the driving motor is generally arranged in front hub or rear hub, thus it is also called wheel hub motor. As the power core component on electric moped, the development of wheel hub motor in the industry is mainly small-sized and high-power, high-output torque.

[0003] The stator of the existing wheel hub motor is silicon steel core, which is punched from steel belt and bonded by laminated sheet and formed by heat curing, the manufacturing process is complicated, the production line is long, and the silicon steel core will have large loss in use, which mainly includes hysteresis loss and eddy current loss, the hysteresis loss is caused by the unsmooth arrangement of molecular magnetic moment when the core is magnetized reversely, and the eddy current loss is energy loss caused by heat generated by eddy current induced in the core in alternating magnetic field.

[0004] The existing core has the problems of complex manufacturing process, high cost, serious loss and low efficiency, therefore, it is urgent to develop a new type of core and motor, which can overcome the above problems and meet the requirements of light weight and high efficiency. SUMMARY

[0005] Technical problem to be solved

[0006] The utility model solves the technical problem to provide a kind of wheel hub motor, compact structure, small, manufacturing process is simple, loss is low and the efficiency of high.

[0007] Technical scheme for solving the problem

[0008] The utility model provides a kind of wheel hub motor, it includes main shaft 1 and wheel hub shell 2 being rotatably installed on the main shaft 1 by bearing, the both ends of the main shaft 1 extend to the outside of the wheel hub shell 2 and as the connecting end with frame, the end of the connecting end is equipped with external thread;Stator 3 and the rotor 4 that can rotate around the stator 3 are equipped in the wheel hub shell 2, the core of the stator 3 and / or the rotor 4 is made of amorphous material, the stator 3 is fixed on the main shaft 1, the rotor 4 and the wheel hub shell 2 between are equipped with planetary reduction assembly and can drive the wheel hub shell 2 rotation, the transmission ratio of the planetary reduction assembly is greater than or equal to 6 and less than or equal to 14.

[0009] Further, the rated speed of the wheel hub shell 2 is 180RPM-400RPM.

[0010] Further, the transmission ratio of the planetary reduction assembly is greater than or equal to 9 and less than or equal to 12.5.

[0011] Further, the transmission ratio of the planetary reduction assembly is greater than or equal to 9 and less than or equal to 12.

[0012] Further, the transmission ratio of the planetary reduction assembly is 115 / 12.

[0013] Further, the rated torque of the wheel hub shell 2 is 8NM-16NM.

[0014] Further, the planetary reduction assembly is a two-stage or three-stage reduction assembly.

[0015] Further, the planetary reduction assembly includes a sun gear fixed on the rotor, a ring gear fixed on the inner wall of the wheel hub shell, a planet carrier fixed on the main shaft, and a plurality of planetary gears provided on the planet carrier, the planetary gears are double planetary gears and have a large gear end engaged with the sun gear and a small gear end engaged with the ring gear, and form a two-stage reduction.

[0016] Further, the number of teeth of the sun gear is 18, the number of teeth of the large gear end of the planetary gear is 45, the number of teeth of the small gear end is 18, and the number of teeth of the ring gear is 69.

[0017] Further, the 80% efficiency platform ratio of the wheel hub motor is:

[0018]

[0019] Wherein, N1 is the torque range when the motor efficiency is greater than or equal to 80%, and N2 is the full torque range of the motor.

[0020] Further, the highest efficiency of the wheel hub motor is greater than or equal to 85%.

[0021] Further, the diameter of the wheel hub shell is 110mm-145mm, and the axial width of the wheel hub shell is 80mm-120mm.

[0022] Advantages

[0023] The utility model wheel hub motor, the core adopts noncrystalline material to make, and the transmission ratio is optimized design, has improved the efficiency of motor, also has widened the efficiency platform interval, makes motor can keep higher work efficiency under different working conditions, not only reduces energy consumption, brings longer cruising range, also has promoted the stability and reliability of motor in full working condition range, makes the driving control of whole vehicle more smooth, simultaneously, under the premise of satisfying design requirement, greatly reduces the volume of product, reduces the installation space, is favorable to the installation and layout on the vehicle, reduces the production cost, strengthens the market competitiveness, this makes motor shows excellent performance in diversified application scene, satisfies the urgent demand of modern traffic tool to high efficiency, low energy consumption, besides, the use of noncrystalline material also brought good thermal stability and corrosion resistance, the core loss is small, further prolongs the service life of motor, reduces the maintenance cost, brings better experience for the user, the utility model wheel hub motor, compact structure, small, high work efficiency, and the efficiency platform interval is big, and the use effect is good. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is structure schematic diagram of the utility model wheel hub motor;

[0025] Figure 2 It is new and old motor efficiency curve diagram under the first rotation speed and the first transmission ratio;

[0026] Figure 3 It is new and old motor efficiency curve diagram under the second rotation speed and the first transmission ratio;

[0027] Figure 4 It is new and old motor efficiency curve diagram under the third rotation speed and the first transmission ratio;

[0028] Figure 5 It is new and old motor efficiency curve diagram under the fourth rotation speed and the second transmission ratio

[0029] Figure 6 It is new and old motor efficiency curve diagram under the fifth rotation speed and the second transmission ratio;

[0030] Figure 7 It is new and old motor efficiency curve diagram under the sixth rotation speed and the second transmission ratio;

[0031] Figure 8 It is new and old motor efficiency curve diagram under the seventh rotation speed and different transmission ratio;

[0032] In the drawing: 1, main shaft, 11, rotor support, 2, wheel hub shell, 3, stator, 31, stator support, 4, rotor, 41, planetary carrier, 42, center gear, 43, planetary gear, 44, gear ring. DETAILED DESCRIPTION

[0033] The utility model discloses an embedded type LED display screen, including the LED display screen, the LED display screen is embedded in the embedded type LED display screen.

[0034] Referring to Figure 1The utility model provides a kind of wheel hub motor, it includes main shaft 1, wheel hub shell 2, stator 3, rotor 4 and planetary reduction assembly, the cross section of wheel hub shell 2 is circular, overall formation cylindrical structure, its inside is hollow, forms mounting cavity, for installing stator 3, rotor 4 and planetary reduction assembly, main shaft 1 is coaxially arranged with wheel hub shell 2, main shaft 1 is rotatably installed on wheel hub shell 2 by several bearings, its both ends extend to wheel hub shell 2 outside, and as mounting end, for fixed on frame, namely use, main shaft 1 is in fixed state, wheel hub shell 2 is in rotating state, so it can be understood that wheel hub shell 2 is rotatably installed on main shaft 1, wheel hub shell 2 is connected with tire by steel ring, for driving tire rotation, realizes power-assisted drive;Stator support 31 is provided in wheel hub shell 2, the stator support 31 is overall cylindrical, it is coaxial with main shaft 1, one end of stator support 31 extends radially inward, and is fixedly connected with main shaft 1, the outer wall of stator support 31 forms cylindrical mounting portion, annular protrusion is equipped in one end of mounting portion, forms leaning surface, for carrying out axial limit;Stator 3, i. e. iron core, is sleeved on stator support 31, the stator is overall cylindrical, installation hole is formed in the center of stator, it is sleeved on the cylindrical mounting portion of stator support 31, one end end portion is contacted with annular protrusion, and axial limit is realized, to realize the accurate installation of stator;Meanwhile, rotor support 11 is rotatably installed on main shaft 1, the brim of rotor support 11 is bent 90 degrees to stator direction, forms rotor mounting portion, the rotor mounting portion is cylindrical, it is coaxial with stator, and located in stator 3 outside, rotor 4 is fixed on the inner wall of cylindrical rotor mounting portion, the rotor is cylindrical, it is magnet, coaxial with stator, and located in stator outside, stator 3 can generate electromagnetic force after electrification, and drive rotor 4 rotation;A planetary reduction assembly is arranged between the rotor 4 and the hub shell 2, which comprises a center gear 42, i.e. a sun gear, rigidly fixed at the end of the rotor 4 and coaxial with the rotor 4, and a plurality of planetary gears 43 and a ring gear 44. A planetary carrier 41 is arranged in the hub shell 2, and the planetary gears 43 are circumferentially and uniformly arranged on the planetary carrier 41. Specifically, the axis of the planetary carrier 41 is coaxial with the main shaft 1, and a through hole is formed in the center of the planetary carrier 41 for accommodating the main shaft 1. A key is arranged between the through hole and the main shaft 1 for connecting the planetary carrier 41 with the main shaft 1, i.e. the planetary carrier 41 is fixedly connected with the main shaft 1 and can rotate synchronously or fixedly with the main shaft 1. A planetary shaft is arranged at one end of the planetary carrier 41, and the axis of the planetary shaft is parallel to the rotation axis of the stator 3. The planetary gears 43 are rotatably mounted on the planetary shaft through bearings. In this embodiment, the planetary gears 43 are double gears, i.e. they comprise coaxial large gears and small gears. The large gears of the planetary gears 43 are engaged with the center gear 42, and the number of teeth of the large gears of the planetary gears 43 is greater than that of the center gear 42, thereby forming a first-stage reduction. The small gears of the planetary gears 43 are engaged with the ring gear 44 fixed on the inner wall of the hub shell 2, and the number of teeth of the small gears of the planetary gears 43 is less than that of the ring gear 44, thereby forming a second-stage reduction.

[0035] In operation, the two ends of the main shaft 1 are fixed on a frame (not shown in the figure), the outer side of the hub shell 2 is connected with a rim through spokes, and a tire is mounted on the rim. The stator 3 is powered to drive the rotor 4 to rotate, the rotor 4 drives the rotor support 31 to rotate, the rotor support 31 drives the center gear 42 to rotate, the center gear 42 drives the planetary gears 43 to rotate, and the planetary gears 43 drive the ring gear 44 to rotate. Since the ring gear 44 is rigidly fixed on the inner wall of the hub shell 2, the rotation of the hub shell 2 is realized. Since the planetary gears 43 are double gears, two-stage reduction is realized, the transmission ratio is large, the output torque is high, and the output is stable.

[0036] In this application, the stator 3 is made of amorphous material, which is also called metallic glass. It is a green engineering material with excellent soft magnetic properties. It adopts a plane flow casting belt technology, and the metallurgical process is short, which saves 80% of energy compared with the ordinary steel manufacturing process. It has good physical properties, mechanical properties and chemical properties. For physical properties, it has a low melting point, low electrical conductivity and low thermal conductivity. For mechanical properties, it has high strength, good hardness, scratch resistance, no plastic deformation, and high elastic limit. For chemical properties, it has high corrosion resistance.

[0037] The output rotation speed of the hub motor of the present application, i.e. the output rotation speed of the hub shell 2, is 100 RPM-400 RPM, wherein the transmission ratio of the planetary reduction assembly is greater than or equal to 6 and less than or equal to 14, in the present embodiment, the transmission ratio of the planetary reduction assembly is greater than or equal to 9 and less than or equal to 12.5, preferably, 9.5-10, and the most optimal transmission ratio is 115 / 12≈9.58, and the highest output efficiency η 出 greater than or equal to 85%;

[0038]

[0039] wherein η 出 is the output efficiency, S 出 is the output rotation speed, N 出 is the output torque, U 入 is the input voltage, I 入 is the input current;

[0040] At the same time, the 80% efficiency platform of the hub motor accounts for:

[0041]

[0042] wherein N1 is the torque range with motor efficiency greater than or equal to 80%, N2 is the full torque range of the motor, i.e. the range from 0 to the locked-rotor torque (maximum torque), the torque range of the 80% efficiency platform, i.e. the span from the starting point to the end point of the torque range when the efficiency is greater than 80%, the greater the span, the higher the efficiency, which can enable the motor to maintain high working efficiency under different working conditions, in the present application, the efficiency ratio of more than 80% is more than 23%, i.e. from the lowest rotation speed (0 RPM) to the highest rotation speed, 23% and above of the output efficiency is greater than 80%.

[0043] For the motor stator of the present application, it has excellent soft magnetic properties, with the advantages of low iron loss, high efficiency and energy saving, in the present embodiment, the stator is made of iron-based amorphous material, which is made of iron-based amorphous strip, and the performance comparison with cold-rolled silicon steel is shown in the following table:

[0044] Table 1:

[0045]

[0046] The iron core made of amorphous material can improve the efficiency of the motor, and the amorphous material can reduce the iron core loss of the motor by 80%-93%.

[0047] After using amorphous material, the reduction mechanism needs to be redesigned to match the motor body, so that the motor as a whole has the optimal output efficiency and efficiency platform.

[0048] The wheel hub motor should meet the following performance indicators of the vehicle in driving capability: maximum vehicle speed, vehicle acceleration time, and maximum climbing degree.

[0049] The driving equation of the vehicle is:

[0050]

[0051] wherein Ft is the total driving force of the vehicle, G is the gravity, f is the friction force between the wheel and the road, I r is the road slope, C d is the wind resistance coefficient, A is the windward area, u is the vehicle speed, δ is the mass conversion coefficient, and m is the vehicle weight.

[0052] The driving equation of the vehicle is:

[0053]

[0054] wherein Pw is the total output power of the wheel hub motor, Ft is the total driving force of the vehicle, G is the gravity, f is the friction force between the wheel and the road, I r is the road slope, C d is the wind resistance coefficient, A is the windward area, u is the vehicle speed, δ is the mass conversion coefficient, m is the vehicle weight, and η is the transmission efficiency of the wheel hub motor.

[0055] When the vehicle is uniformly driven at the highest speed in an ideal state, i.e., on a road without slope, the driving power of a single wheel hub motor is:

[0056]

[0057] wherein P u is the driving power of the wheel hub motor at the highest speed, u max is the highest speed, G is the gravity, f is the friction force between the wheel and the road, C d is the wind resistance coefficient, A is the windward area, and η is the transmission efficiency of the wheel hub motor.

[0058] When the vehicle is driven on the maximum slope, the driving power of a single wheel hub motor is:

[0059]

[0060] wherein P i is the driving power of the wheel hub motor at the maximum climbing, u t is the climbing speed, G is the gravity, f is the friction force between the wheel and the road, C d is the wind resistance coefficient, A is the windward area, η is the transmission efficiency of the wheel hub motor, and I max is the maximum slope.

[0061] When the vehicle accelerates from 0 to ut, the driving power of a single wheel hub motor is:

[0062]

[0063] where P t is the driving power required to accelerate from 0 to ut; G is the gravity, f is the friction between the wheel and the road, C d is the wind resistance coefficient, A is the windward area, u t is the vehicle speed, δ is the mass conversion coefficient, m is the vehicle weight, and η is the transmission efficiency of the wheel hub motor;

[0064] Therefore, the peak power P p of the wheel hub motor needs to meet the following conditions:

[0065] P p ≥{P u , P i , P t};

[0066] where P u is the wheel hub motor driving power at the highest speed, P i is the wheel hub motor driving power at the maximum climbing, and P t is the driving power required to accelerate from 0 to u t ;

[0067] The maximum speed n p is determined by the highest speed u max , the wheel radius R w , and the reduction ratio i q of the wheel hub motor, and the calculation formula is:

[0068]

[0069] where n p is the maximum speed, u max is the highest speed, R w is the wheel radius, and i q is the reduction ratio;

[0070] The reduction ratio is obtained as:

[0071]

[0072] The maximum torque T p of the wheel hub is:

[0073]

[0074] where T p is the maximum torque, P p is the peak power of the motor, and n pFor maximum speed;

[0075] Rated power P m For:

[0076]

[0077] Wherein, Pm is rated power, Pp is peak power, and λ is overload coefficient;

[0078] In this application, the wheel size of the load is 16-28 inches, and the required output speed is 180-400 RPM, and the output linear speed of the wheel can be calculated. At the same time, according to the installation requirements of the load, the thickness of the hub shell is 80-120 mm, and the diameter is 110-145 mm, so the installation space inside, that is, the size of the stator and rotor is limited, and according to the formula, the calculation result and the installation space are combined to obtain the transmission ratio of 6-14, preferably 9-12 or 9-12.5. Due to the use of new materials, the efficiency platform changes, so the motor sample is made and the data of different transmission ratios are analyzed. After years of research and development by the R&D personnel of our company, it is found that when 18 / 45 and 18 / 69 are used, the efficiency platform is optimal, that is, the number of teeth of the central gear is 18, the number of teeth of the large gear of the planetary gear is 45, the number of teeth of the small gear of the planetary gear is 18, and the number of teeth of the ring gear is 69. At this time, the transmission ratio i is

[0079]

[0080] That is, under this transmission ratio, the hub motor has the optimal efficiency platform and can meet the design requirements of the load;

[0081] The R&D personnel of our company compared and analyzed the different speeds and transmission ratios of new and old materials, and the test data are as follows:

[0082] Table 2: New material (amorphous) motor 1, no-load speed 198 RPM, transmission ratio 9.58;

[0083]

[0084]

[0085] From the above table 2 test data, it can be seen that the highest efficiency is 86.80%, the 80% efficiency torque starting point is 2.51 (N·M), the 80% efficiency torque ending point is 22.25 (N·M), and the efficiency platform torque interval is 19.74.

[0086] Table 3: New material (amorphous) motor 2, no-load speed 233 RPM, transmission ratio 9.58;

[0087]

[0088] From the above Table 3 test data, the highest efficiency is 86.80%, the 80% efficiency torque starting point is 4.6 (N·M), the 80% efficiency torque end point is 22.6 (N·M), and the efficiency platform torque interval is 18.

[0089] Table 4: New material (amorphous) motor 3, no-load speed 356 RPM, transmission ratio 9.58;

[0090]

[0091]

[0092]

[0093] From the above Table 4 test data, the highest efficiency is 83.60%, the 80% efficiency torque starting point is 5.15 (N·M), the 80% efficiency torque end point is 16.71 (N·M), and the efficiency platform torque interval is 11.56.

[0094] Table 5: Old material (silicon steel) motor 4, no-load speed 198 RPM, transmission ratio 9.58;

[0095]

[0096]

[0097] From the above Table 5 test data, the highest efficiency is 80.40%, the 80% efficiency torque starting point is 12.69 (N·M), the 80% efficiency torque end point is 18.27 (N·M), and the efficiency platform torque interval is 5.58.

[0098] Table 6: Old material (silicon steel) motor 5, no-load speed 232 RPM, transmission ratio 9.58;

[0099]

[0100]

[0101]

[0102] Table 6: Old material (silicon steel) motor 5, no-load speed 232 RPM, transmission ratio 9.58;

[0103] From the above Table 6 test data, the highest efficiency is 79.6%, not 80%, and there is no 80% efficiency platform.

[0104] Table 7: Old material (silicon steel) motor 6, no-load speed 366 RPM, transmission ratio 9.58;

[0105]

[0106]

[0107] From the above Table 7 test data, the highest efficiency is 77.40%, not up to 80%, no 80% efficiency platform.

[0108] Table 8: New material (amorphous) motor 7, no-load speed 199 RPM, transmission ratio 11.2;

[0109]

[0110]

[0111] From the above Table 8 test data, the highest efficiency is 86.80%, the 80% efficiency torque starting point is 5.4 (N·M), the 80% efficiency torque end point is 26.4 (N·M), and the efficiency platform torque interval is 21.

[0112] Table 9: New material (amorphous) motor 8, no-load speed 247 RPM, transmission ratio 11.2;

[0113]

[0114]

[0115]

[0116] From the above Table 9 test data, the highest efficiency is 85.60%, the 80% efficiency torque starting point is 4.8 (N·M), the 80% efficiency torque end point is 23 (N·M), and the efficiency platform torque interval is 18.2.

[0117] Table 10: New material (amorphous) motor 9, no-load speed 304 RPM, transmission ratio 11.2;

[0118]

[0119]

[0120] From the above Table 10 test data, the highest efficiency is 83.7%, the 80% efficiency torque starting point is 5.5 (N·M), the 80% efficiency torque end point is 20 (N·M), and the efficiency platform torque interval is 14.5.

[0121] Table 11: Old material (silicon steel) motor 10, no-load speed 198 RPM, transmission ratio 11.2;

[0122]

[0123]

[0124]

[0125] From the above Table 11 test data, the highest efficiency is 79.60%, which does not reach 80% efficiency.

[0126] Table 12: Old material (silicon steel) motor 11, no-load speed 247 RPM, transmission ratio 11.2;

[0127]

[0128]

[0129] From the above Table 12 test data, the highest efficiency is 77.7%, which does not reach 80%, and there is no 80% efficiency platform.

[0130] Table 13: Old material (silicon steel) motor 12, no-load speed 313 RPM, transmission ratio 11.2;

[0131]

[0132]

[0133] From the above Table 13 test data, the highest efficiency is 80.4%, the 80% efficiency torque starting point is 16.46 (N·M), the 80% efficiency torque ending point is 16.46 (N·M), and the efficiency platform torque interval is 0.

[0134] Table 14: New material (amorphous) motor 13, no-load speed 237 RPM, transmission ratio 11.2;

[0135]

[0136]

[0137] From the above Table 14 test data, the highest efficiency is 85.30%, the 80% efficiency torque starting point is 4.93 (N·M), the 80% efficiency torque ending point is 22 (N·M), and the efficiency platform torque interval is 17.07.

[0138] Table 15: New material (amorphous) motor 14, no-load speed 233 RPM, transmission ratio 9.58;

[0139]

[0140]

[0141] From the above Table 15 test data, the highest efficiency is 86.80%, the 80% efficiency torque starting point is 4.6 (N·M), the 80% efficiency torque ending point is 22.6 (N·M), and the efficiency platform torque interval is 18.

[0142] Table 16: New material (amorphous) motor 15, no-load speed 240 RPM, transmission ratio 4.43;

[0143]

[0144]

[0145] From the above Table 16 test data, the highest efficiency is 85.10%, the 80% efficiency torque starting point is 1 (N·M), the 80% efficiency torque ending point is 7 (N·M), and the efficiency platform torque interval is 6.

[0146] In order to intuitively understand the efficiency platform under different materials, different speeds and different transmission ratios, the above table data is processed into a curve for comparison and analysis.

[0147] Referring to Table 2, Table 5 and Figure 2 Table 2 is the test data of the motor using the amorphous material core (new motor 1), Table 5 is the test data of the motor using the silicon steel material core (old motor 4), both of which have a speed of 198 RPM and a transmission ratio of 9.58. It can be seen that the starting point of the 80% efficiency torque (hereinafter referred to as the efficiency platform starting point) of the new motor 1 is 2.51 N·M, the ending point of the 80% efficiency torque (hereinafter referred to as the efficiency platform ending point) is 22.25 N·M, the torque interval of the 80% efficiency platform (hereinafter referred to as the efficiency platform interval) is 19.74, and the efficiency reaches the highest when the torque is 7.37 N·M, which is 86.80%. Under the same conditions, the efficiency platform starting point of the old motor 4 is 12.69 N·M, the efficiency platform ending point is 18.27 N·M, the efficiency platform interval is 5.58, and the interval span is much smaller than the 19.74 of the new motor 1. When the torque is 13.4 N·M, the efficiency is the highest, which is 80.40%, which is less than the highest efficiency of the new motor 1. The efficiency platform of the new motor 1 is much better than that of the old motor 4, that is, the efficiency of the new motor is higher and the use effect is better.

[0148] Referring to Table 3, Table 6 and Figure 3Table 3 is the test data of the motor with the core of amorphous material (new motor 2), and Table 6 is the test data of the motor with the core of silicon steel material (old motor 5), both of which have a rotation speed of 230 RPM and a transmission ratio of 9.58. It can be seen that the efficiency platform starting point of the new motor 2 is 4.6 N·M, the efficiency platform ending point is 22.6 N·M, the efficiency platform interval is 18, the efficiency reaches the highest when the torque is 11.3 N·M, and the highest efficiency is 86.80%. Under the same conditions, the highest efficiency of the old motor 5 is 79.6%, which does not reach the starting point of 80% efficiency, that is, there is no efficiency platform. Under the same conditions, the performance of the motor using the new material is much better than that of the motor using the old material.

[0149] Referring to Table 4, Table 7 and Figure 4 Table 4 is the test data of the motor with the core of amorphous material (new motor 3), and Table 7 is the test data of the motor with the core of silicon steel material (old motor 6), both of which have a rotation speed of 360 RPM and a transmission ratio of 9.58. It can be seen that the efficiency platform starting point of the new motor 3 is 5.15 N·M, the efficiency platform ending point is 16.71 N·M, the efficiency platform interval is 11.56, the efficiency reaches the highest when the torque is 9.34 N·M, and the highest efficiency is 83.6%. Under the same conditions, the highest efficiency of the old motor 6 is 77.4%, which does not reach the starting point of 80% efficiency, that is, there is no efficiency platform. Under the same conditions, the performance of the motor using the new material is much better than that of the motor using the old material.

[0150] The above three groups of tests are comparisons between new and old motors under the same conditions (same rotation speed, same transmission ratio). From the data and curves, it can be seen that under the same rotation speed and transmission ratio, after using the amorphous material, the new motor has an improvement of 7.9%-8.0% in the highest efficiency, and an average efficiency improvement of 8.9%-19.1%, that is, the new motor has higher working efficiency, larger efficiency platform interval, and better use effect.

[0151] Referring to Table 8, Table 11 and Figure 5 Table 8 is the test data of the motor with the core of amorphous material (new motor 7), and Table 11 is the test data of the motor with the core of silicon steel material (old motor 10), both of which have a rotation speed of 200 RPM and a transmission ratio of 11.2. It can be seen that the efficiency platform starting point of the new motor 7 is 5.4 N·M, the efficiency platform ending point is 26.4 N·M, the efficiency platform interval is 21, the efficiency reaches the highest when the torque is 13.2 N·M, and the highest efficiency is 86.80%. Under the same conditions, the highest efficiency of the old motor 10 is 79.6%, which does not reach 80%, that is, there is no efficiency platform. Under the same conditions, the performance of the motor using the new material is much better than that of the motor using the old material.

[0152] Referring to Table 9, Table 12 andFigure 6 Table 4 is the test data of the motor with the core of amorphous material (new motor 8), and Table 12 is the test data of the motor with the core of silicon steel material (old motor 11), both of which have a rotation speed of 250 RPM and a transmission ratio of 11.2. It can be seen that the starting point of the efficiency platform of the new motor 8 is 4.8 N·M, the ending point of the efficiency platform is 23 N·M, the interval of the efficiency platform is 18.2, the efficiency reaches the highest when the torque is 12.33 N·M, and the highest efficiency is 85.6%. Under the same conditions, the highest efficiency of the old motor 11 is 77.7%, which is less than 80%, and there is no 80% efficiency platform. The efficiency platform of the new motor 8 is much better than that of the old motor 11, that is, the efficiency of the new motor is higher, and the use effect is better.

[0153] Referring to Table 10, Table 13 and Figure 7 Table 10 is the test data of the motor with the core of amorphous material (new motor 9), and Table 13 is the test data of the motor with the core of silicon steel material (old motor 12), both of which have a rotation speed of 300 RPM and a transmission ratio of 11.2. It can be seen that the starting point of the efficiency platform of the new motor 9 is 5.5 N·M, the ending point of the efficiency platform is 20 N·M, the interval of the efficiency platform is 14.5, the efficiency reaches the highest when the torque is 14.19 N·M, and the highest efficiency is 83.70%. Under the same conditions, the starting point of the efficiency platform of the old motor 12 is 16.46 N·M, the ending point of the efficiency platform is also 16.46 N·M, the interval of the efficiency platform is 0, that is, the interval of the efficiency is very small and can be ignored, and the interval span is much smaller than 14.5 of the new motor 9. The highest efficiency is 80.4% when the torque is 16.46 N·M, which is less than the highest efficiency of the new motor 9. The efficiency platform of the new motor 9 is much better than that of the old motor 12, that is, the efficiency of the new motor is higher, and the use effect is better.

[0154] The above three groups of tests are comparisons between new and old motors under the same conditions (same rotation speed and same transmission ratio). From the data and curves, it can be seen that under the same rotation speed and transmission ratio, the new motor with amorphous material has an improved highest efficiency of 4.1%-10.16%, and an average efficiency improvement of 15.5%-20.1%, that is, the working efficiency of the new motor is higher, the interval span of the efficiency platform is larger, the use effect is better, and the energy saving is more obvious.

[0155] Referring to Table 14-Table 16 and Figure 8, which are new electric machines 13-15, the rotating speeds of which are all 240 RPM, and the transmission ratios of which are 11.2, 9.58 and 4.43 respectively, it can be seen that when the transmission ratio is 11.2, the efficiency platform starting point of the new electric machine 13 (transmission ratio 11.2) is 4.93 N·M, the efficiency platform ending point is 22 N·M, the efficiency platform interval is 17.07, the average efficiency is 66.13%, and when the torque is 7.91 N·M, the efficiency reaches the highest, which is 85.30%; the efficiency platform starting point of the new electric machine 14 (transmission ratio 9.58) is 4.6 N·M, the efficiency platform ending point is 22.6 N·M, the efficiency platform interval is 18, the average efficiency is 68.29%, and when the torque is 11.3 N·M, the efficiency reaches the highest, which is 86.80%; the efficiency platform starting point of the new electric machine 15 (transmission ratio 4.43) is 1 N·M, the efficiency platform ending point is 7 N·M, the efficiency platform interval is 6, the average efficiency is 66.23%, and when the torque is 3.38 N·M, the efficiency reaches the highest, which is 85.1%; thus it can be seen that under the same rotating speed, the working efficiency of the transmission ratio 9.58 is optimal.

[0156] The utility model wheel hub motor, the core adopts non -crystalline material and makes, and to transmission ratio carries out the optimal design, improved the efficiency of motor, also widened the efficiency platform interval, so that motor can keep higher working efficiency under different working conditions, not only reduce energy consumption, bring longer cruising range, still promoted the stability and reliability of motor in full working condition range, make the whole car's driving control more smooth, simultaneously, under the premise of satisfying design requirement, greatly reduce the volume of product, reduce the installation space, benefit in the installation and layout on the vehicle, reduce the production cost, strengthen the market competitiveness. This makes the motor show excellent performance in diversified application scene, satisfies the urgent need of modern traffic tool to high efficiency, low energy consumption, in addition, the use of non -crystalline material also brought good thermal stability and corrosion resistance, the core loss is small, further prolongs the service life of motor, reduces the maintenance cost, brings better experience for the user, the utility model wheel hub motor, compact structure, small, high working efficiency, and efficiency platform interval is big, and the use effect is good.

[0157] The above is only the preferred embodiment of the utility model, it should be pointed out that for ordinary skilled person in the art, without departing from the technical principle of the utility model, can make a number of improvements and refinements, these improvements and refinements also should be considered as the protection scope of the utility model.

Claims

1. A wheel hub motor, characterized by: The hub motor comprises a main shaft and a hub shell rotatably mounted on the main shaft by bearings, both ends of the main shaft extend out of the hub shell and serve as connecting ends with a frame, the end of the connecting end is provided with an external thread; the hub shell is provided with a stator and a rotor rotatable around the stator, the core of the stator and / or the rotor is made of amorphous material, the stator is fixed on the main shaft, the rotor and the hub shell are provided with a planetary reduction assembly and can drive the hub shell to rotate, the transmission ratio of the planetary reduction assembly is greater than or equal to 6 and less than or equal to 14.

2. The wheel hub motor of claim 1, wherein: The rated rotating speed of the hub shell is 180 RPM-400 RPM.

3. The in-wheel motor according to claim 1, characterized by: The transmission ratio of the planetary reduction assembly is greater than or equal to 9 and less than or equal to 12.

5.

4. The in-wheel motor according to claim 1, characterized by: The rated torque of the hub shell is 8 NM-16 NM.

5. The in-wheel motor according to claim 1, characterized by: The transmission ratio of the planetary reduction assembly is 115 / 12.

6. The in-wheel motor according to claim 1, characterized by: The planetary reduction assembly comprises a central gear fixed on the rotor, a ring gear fixed on the inner wall of the hub shell, a planet carrier fixed on the main shaft and a plurality of planetary gears provided on the planet carrier, the planetary gears are double planetary gears and have a large gear end engaged with the central gear and a small gear end engaged with the ring gear, and form two-stage reduction.

7. The wheel hub motor of claim 6, wherein: The number of teeth of the central gear is 18, the number of teeth of the large gear end of the planetary gear is 45, the number of teeth of the small gear end is 18, and the number of teeth of the ring gear is 69.

8. The in-wheel motor according to claim 1, characterized by: The 80% efficiency platform ratio of the hub motor is: wherein N 1 is the torque interval for motor efficiency greater than or equal to 80%, and N2 is the full torque interval of the motor.

9. The in-wheel motor according to claim 1, characterized by: The highest efficiency of the hub motor is greater than or equal to 85%.

10. The in-wheel motor according to claim 1, characterized by: The diameter of the hub shell is 110 mm-145 mm, and the axial width of the hub shell is 80 mm-120 mm.

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