27results about How to "Increase output torque" patented technology

The utility model discloses a portable construction site fire alarm device which comprises a gear box, a gear assembly, a driving assembly, a fan blade seat and an air bellow, the driving assembly is connected with the gear assembly and used for driving the fan blade seat to rotate, and the fan blade seat is located in the air bellow and provided with blades. The air bellow is used for forming air flow during rotation and sending out wind sounding alarm sound through an air window on the air bellow; the gear assembly comprises a gear column, a mounting disc and an auxiliary gear, and the auxiliary gear is meshed with the gear column and the gear box; the driving assembly comprises a driving disc, a driving rod, a rotating handle and a guiding structure and is used for achieving manual driving and torque transmission. The device can quickly give out high-decibel alarm sound on a construction site without electric power, is compact in structure, convenient to carry and simple to operate, and is suitable for places with insufficient electric power conditions or complex environments.

This utility model relates to the field of power machinery technology and discloses a centrifugal mechanical power enhancer, including a support frame with a symmetrical support structure. One end is fixed with a reinforcing part, and the other end is rotatably connected to a second gear disk. The middle section supports a drive device. The drive device, using a motor structure, is located at the lower part of the support frame and is connected to the drive shaft via a chain to provide initial rotational power. The reinforcing part, the core power enhancement unit, includes: a first gear disk, coaxially connected to a connecting shaft, with an inner gear ring meshing with a drive gear, and circumferentially distributed mounting positions for the iron-throwing parts on the outer side; a positioning disk, coaxially arranged with the gear disk and maintaining a distance, rotatably connected to the support frame via bearings, providing a reaction force fulcrum for the iron-throwing parts; and three symmetrically arranged iron-throwing parts, each containing a 24 kg iron-throwing body. This utility model features a compact structure, efficient transmission, and enhanced power through the cooperation of the iron-throwing parts and gear disks. The electrical control cabinet allows for precise adjustment, adapting to different loads and exhibiting strong stability.

The utility model relates to an opening and closing curtain motor assembly of an outer rotor motor structure. The technical problem that an existing outer rotor motor is too small in torque is solved. Comprising a transmission box body, an output head penetrating out of the outer side of the transmission box body is rotationally arranged in the transmission box body, a driving motor is arranged in the transmission box body and is an outer rotor motor, and a circuit board mounting frame connected with the driving motor is arranged on the outer side of one end of the driving motor; a circuit board body connected with the driving motor is arranged on the side, away from the driving motor, of the circuit board mounting frame, and a motor shaft of the driving motor sequentially penetrates through the circuit board mounting frame and the circuit board body and then is connected with the output head through a transmission gear structure. The driving motor has the advantages that the motor shaft is in transmission connection with the output head through the transmission gear structure, output torque can be improved, and the driving motor can be suitable for heavy curtains. And the circuit board body is arranged on the outer side of the driving motor through the bracket mounting plate, so that the circuit board body can be conveniently mounted and maintained.

The application relates to a winding structure of a motor for an electric vehicle, comprising a stator, the stator comprising tooth bars, tooth slots and windings, the windings being wound on the tooth bars in clockwise or counterclockwise directions, the windings on the same tooth bar being wound in batches, the winding directions of the windings on the same tooth bar being the same, and the windings on the same tooth bar being connected in series. The winding structure of the application increases the conductor wire diameter of the motor winding, the windings on the same tooth are wound in batches, the crowded position of the copper wire is effectively avoided, the idle tooth slot space is utilized, the slot fill factor is greatly improved, the current carrying capacity of the motor is improved, the copper consumption is reduced, the motor efficiency is improved, the output torque and the cruising range are increased.

The application provides a radial plunger hydraulic device and relates to the technical field of hydraulic transmission. The radial plunger hydraulic device comprises a flow distribution part connected with an eccentric main shaft, the flow distribution part comprises a first high-pressure flow distribution window, a first low-pressure flow distribution window, a second high-pressure flow distribution window, a second low-pressure flow distribution window, a high-pressure oil hole and a low-pressure oil hole; the flow distribution part is adapted to rotate with the eccentric main shaft and is configured to be capable of controlling the first high-pressure flow distribution window and the first low-pressure flow distribution window to be connected with the first control oil path in advance / delayed or controlling the second high-pressure flow distribution window and the second low-pressure flow distribution window to be connected with the second control oil path in advance / delayed, so that the hydraulic control one-way valve is closed when the two-way plug-in valve is opened or the hydraulic control one-way valve is opened when the two-way plug-in valve is closed. Through the scheme, the volumetric efficiency of the radial plunger hydraulic device can be improved and the impact and vibration can be relieved.

The invention provides an axial magnetic flux electric joint module system for an assembly modular robot, which comprises a plurality of functional assemblies, and the plurality of functional assemblies comprise a driver assembly, an encoder assembly, a brake assembly, an axial magnetic flux motor assembly, a speed reducer assembly and a torque sensor assembly, each functional assembly comprises a shell, a functional device, an electrical connector and a mechanical connection structure, the functional device and the electrical connector are both installed on the shell, the mechanical connection structure is arranged on the functional device, the functional device is used for achieving the function corresponding to the target functional assembly, and the mechanical connection structure is used for achieving the function corresponding to the target functional assembly. The electrical connector is used for realizing current bridging and signal transmission among the functional components, the mechanical connection structure is used for physical structure connection among the functional components, and the plurality of functional components are stacked in sequence to form the joint module system.

The utility model discloses a portable chain transmission valve grinding machine which solves the problems that in the prior art, a machine body of a valve grinding machine is not easy to adjust, and the grinding flexibility is low. The chain transmission valve grinding machine convenient to move comprises a telescopic machine body, a power mechanism is arranged on the rear portion of the telescopic machine body, a grinding head is arranged on the front portion of the telescopic machine body, and the power mechanism is in transmission connection with the grinding head through a chain mechanism arranged in the telescopic machine body. A machine body fixing mechanism and a machine body adjusting mechanism are arranged below the telescopic machine body; the machine body adjusting mechanism is detachably connected to the telescopic machine body, the machine body fixing mechanism is connected with the machine body adjusting mechanism, the rear portion of the machine body adjusting mechanism is connected with the axial jacking mechanism, and the axial jacking mechanism is detachably connected with the telescopic machine body. The grinding machine has the advantages of being simple in structure, high in strength, low in noise, stable in transmission, low in manufacturing cost and convenient to move, and is particularly suitable for field maintenance operation.

The utility model discloses a self-adaptive pressure mechanism for increasing the torque of a continuously variable transmission, and relates to the technical field of continuously variable transmissions.The continuously variable transmission comprises two conical shafts arranged on a base, the two conical shafts are both rotationally connected with the base, and the central axes of the two conical shafts are parallel to each other; the large-diameter end of one conical shaft and the small-diameter end of the other conical shaft are located on the same side. The two conical shafts are in tensioning connection through a transmission belt; a driving mechanism is further arranged on the base; the self-adaptive pressure mechanism is arranged on the base and used for adjusting the friction force between the transmission belt and any conical shaft. According to the continuously variable transmission, through the arrangement of the self-adaptive pressure mechanism, the friction force between the transmission belt and the conical shaft can be increased when the continuously variable transmission runs, then the probability that the transmission belt slips on the conical shaft in the moving process is reduced, and finally the output torque of the continuously variable transmission is improved, so that the continuously variable transmission can be applied to wider application scenes.

This invention proposes a rotary magnetorheological damper with a hybrid operating mode, comprising a multi-channel stator, a sector block rotor, and a shaft. The multi-channel stator contains channels composed of multiple levels of gaps. The shaft drives the sector block rotor to rotate, causing the gap between the sector block rotor and the multi-channel stator to change, while simultaneously allowing the magnetorheological fluid to flow through the gaps. When the distance between the multi-channel stator and the sector block rotor increases to the point where the main body of the magnetic circuit passes through the multi-channel stator and the large and small arc-shaped magnetic guide blocks, a valve mode is formed at the gap within the multi-channel stator. When the distance between the multi-channel stator and the sector block rotor decreases to the point where the main body of the magnetic circuit also passes through the sector block rotor, a compression mode is formed at the gap between the multi-channel stator and the sector block rotor. This invention has a simple structure and two operating modes, enabling it to provide a larger damping torque in a relatively small volume.

The utility model relates to the field of photovoltaic cleaning devices, in particular to a mechanical linkage photovoltaic water cleaning device which comprises two water wheels, a linkage device and a driving module, each water wheel is provided with a rotating shaft, the bottom end of each rotating shaft is connected with a brush, and the linkage device is connected with the driving module. The linkage device comprises synchronous wheels arranged on the two rotating shafts and a synchronous belt connected with the two synchronous wheels, and the driving module is matched with the water wheels so as to provide high-pressure water flow driving for at least one water wheel. According to the scheme, synchronous rotation of the brushes is achieved through the linkage device, and synchronous rotation of the two brushes is achieved. The problem that the rotating speeds of the brushes on the two sides are inconsistent due to factors such as non-uniform water flow distribution and manufacturing process errors is effectively solved, the situation that the cleaning strength of all areas on the surface of the photovoltaic panel is uneven is solved, stubborn dirt can be better removed, photovoltaic panel abrasion caused by excessive cleaning is avoided, and the service life of the photovoltaic panel is prolonged. And the service life of the photovoltaic panel is prolonged while the cleaning effect is ensured.

The invention discloses a thread flow guide type vertical elevator system based on idle work circulation. The thread flow guide type vertical elevator system comprises a tower, a main lifting unit and a vortex water wheel assembly, wherein the main lifting unit and the vortex water wheel assembly are installed on the tower. The main lifting unit comprises a first lifting machine and a driving conveying shaft. The first lifting machines are fixed to the tower, and hollow conveying cavities are formed in the first lifting machines. And an input port and an output port which are communicated with the outside are formed in the bottom and the top of the conveying cavity correspondingly. The driving conveying shaft is rotationally connected into each conveying chamber; the vortex water wheel assembly is rotationally connected to the tower frame and can rotate under the impact of water flow; and a power output shaft of the vortex water wheel assembly is connected with the driving conveying shaft. Low-grade water resources such as process backflow waste water or idle cooling water are used for driving the driving conveying shaft to rotate through the vortex water wheel assembly, fluid kinetic energy wasted in a traditional elevator is converted into mechanical power, dependence on an external motor is remarkably reduced, and the problem that energy consumption is high is effectively solved.

This application provides a stator lamination, a stator core, a stator, a motor, a powertrain, and a vehicle. The stator lamination is made of an amorphous alloy material and has multiple teeth and a yoke. The teeth are spaced apart along the circumferential direction of the stator lamination, and the yoke is connected to the side of the teeth away from the center of the stator lamination. The radial length of the yoke along the stator lamination is a first length, and the radial length of the teeth along the stator lamination is a second length. The ratio of the first length to the second length satisfies a first preset range, which is 0.95 to 1.52. The stator lamination provided in this application improves motor efficiency by ensuring that the ratio of the first length to the second length satisfies the first preset range.

The utility model discloses a self-adaptive tensioning mechanism for increasing the torque of a continuously variable transmission, and relates to the technical field of continuously variable transmissions.The continuously variable transmission comprises two conical shafts arranged on a base at intervals, the two conical shafts are both rotationally connected with the base, and the central axes of the two conical shafts are parallel to each other; the large-diameter end of one conical shaft and the small-diameter end of the other conical shaft are located on the same side. The two conical shafts are in tensioning connection through a transmission belt; a driving mechanism is further arranged on the base; the self-adaptive tensioning mechanism is arranged on the driving mechanism and used for adjusting the tensioning degree of the transmission belt. Through the arrangement of the self-adaptive tensioning mechanism, the tensioning degree of the transmission belt in the working process can be increased, so that the friction force between the transmission belt and the conical shaft during operation of the continuously variable transmission is increased, the probability of slipping of the transmission belt in the moving process on the conical shaft is further reduced, and finally the output torque of the continuously variable transmission is improved; therefore, the continuously variable transmission can be applied to wider application scenes.

The invention discloses a multi-degree-of-freedom spherical motor mechanism based on gear meshing transmission. The multi-degree-of-freedom spherical motor mechanism comprises a motor base, one or two pitching motors, one or two rolling motors, a cylindrical body with a main output shaft and two arched supporting frames. The outer sides of the two ends of the two arch-shaped supporting frames are fixedly connected with connecting shafts, the inner sides of at least one ends of the two arch-shaped supporting frames are correspondingly and fixedly connected with shells of the pitching motor and the rolling motor, and the two arch-shaped supporting frames are rotationally connected with the motor base through the connecting shafts. Output shafts of the pitching motor and the rolling motor are fixedly connected with gears; at least two arc-shaped racks are arranged on the cylindrical body; two adjacent arc-shaped racks are perpendicular to each other by planes determined by respective center arc lines and circle centers, and an output shaft gear of the pitching motor is correspondingly meshed and matched with one arc-shaped rack; an output shaft gear of the rolling motor is correspondingly meshed and matched with the other arc-shaped rack; the centers of the arch tops of the two arch-shaped supporting frames are both open, and the main output shaft on the cylindrical body extends out of the openings in the centers of the arch tops of the two arch-shaped supporting frames. The invention is easy to manufacture and assemble.

This invention discloses a rope-driven anthropomorphic wrist joint with rotational decoupling characteristics, belonging to the field of robotics technology. It includes a rotational decoupling mechanism and a differential mechanism. In the rotational decoupling mechanism, a fixed wheel is fixed to the robot's forearm, while the driving wheel is connected to the differential mechanism. The rope assembly enables flexible drive of the joint module. The rotational decoupling mechanism employs a movable pulley system, utilizing the characteristics of the movable pulleys to decouple the motion of the two sets of steel cables as they pass through the rotational joint. This allows the drive unit to be centrally located on the robot base or near the proximal end structure. The differential mechanism consists of a differential rotation axis, a fixed seat on the outer side of the differential rotation axis, and two symmetrically arranged sets of differential rotating wheels, forming a differential structure. This enables multi-degree-of-freedom composite movements such as pitch and yaw within a limited space, significantly improving structural compactness. This invention uses a rope-driven combined with rope transmission structure, enhancing joint flexibility and effectively isolating the motor output from impact and vibration.

The utility model relates to a kind of planetary gear reducer, belong to the technical field of speed reducer. Including shell, output mechanism and multistage star wheel speed reduction mechanism, output mechanism includes output shaft, each star wheel speed reduction mechanism includes sun gear, planetary gear, star wheel axle and planet carrier, and cylindrical roller support is equipped between planetary gear and star wheel axle;The sun gear of primary star wheel speed reduction mechanism is keyed connection with the power shaft of motor, shell is equipped with shell internal gear ring, planet carrier is equipped with star carrier internal gear, star carrier internal gear of upper star wheel speed reduction mechanism is engaged with the sun gear of lower star wheel speed reduction mechanism, star wheel axle of N star wheel speed reduction mechanism is connected with output shaft. The utility model compact structure, it can realize wide range of speed reduction ratio, power transmission is stable, planetary gear, star wheel axle and cylindrical roller form integrated planetary gear bearing, can satisfy the requirement of bearing capacity, small space occupies, the speed reducer also has higher bearing capacity and smaller volume, application is more widely.

This invention discloses a tailgate drive mechanism with hovering function and its usage method. The tailgate drive mechanism includes a vehicle body simulation frame and a lower tailgate assembly. The lower tailgate assembly is rotatably connected to the vehicle body simulation frame, and a locking structure is provided between the vehicle body simulation frame and the lower tailgate assembly. The lower tailgate assembly is equipped with a drive mechanism, the output shaft of which is hinged to the vehicle body simulation frame. The hinge point of the drive mechanism's output shaft relative to the vehicle body simulation frame is eccentrically set with respect to the rotation axis of the lower tailgate assembly relative to the vehicle body simulation frame. An elastic tensioning mechanism for keeping the lower tailgate assembly hovering is provided between the vehicle body simulation frame and the lower tailgate assembly. The elastic tensioning mechanism includes a cable and an elastic element. One end of the cable is fixedly connected to the vehicle body simulation frame, and the other end of the cable is elastically connected to the lower tailgate assembly through the elastic element. This design features small installation space requirements, the ability to hover at any angle, low driving force, and a comfortable user experience.

The application discloses a lower limb auxiliary driving mechanism and a robot, which comprises a thigh assembly and a lower leg assembly connected with the thigh assembly, and a connecting end of a thigh connecting piece two and the lower leg assembly forms a knee joint. In the application, a constant force load mechanism is arranged on the thigh assembly, constant tension of a spring is converted into a compensation torque acting on the knee joint, so that the compensation torque can directly offset part or all of the bending moment generated by the weight of the lower limb on the knee joint, thereby realizing accurate compensation of the static load of the knee joint, reducing the driving burden when the joint maintains a posture, and the constant force load spring serves as a parallel auxiliary execution mechanism and jointly bears the load of the knee joint with a motor driving system. Through the parallel sharing mode, the joint load originally borne by the motor can be reasonably distributed, the motor works in a relatively stable and high-efficiency interval more, peak load is reduced, current impact is reduced, and overall driving efficiency is improved.

The invention provides a micro-pulse peristaltic pump type diabetes insulin pump which comprises a shell, a micro-pump medicine bin assembly, a micro motor and a gear assembly are arranged in the shell, and the micro-pump medicine bin assembly is detachably connected with the shell; a medicine bin containing insulin and a micro peristaltic pump used for pumping the insulin are arranged in the micro pump medicine bin assembly, and the two ends of a pump pipe of the micro peristaltic pump are connected with the medicine bin and an external medicine conveying guide pipe respectively. The micro motor is a flat motor, and the ratio of the diameter to the length of an armature of the micro motor is 8: 1. The insulin pump is different from a plunger type insulin pump existing in the current market, a power device adopts a micro peristaltic pump and is combined with a micro flat torque type motor, a speed reducing mechanism does not need to be arranged, the output torque is effectively increased in a limited space, and the dual requirements of the insulin pump for high-precision and low-power-consumption driving are met; the equipment is obviously simplified, and the weight of the equipment is reduced. Meanwhile, flexible supplement of liquid medicine can be achieved through the detachable medicine bin, the medicine bin can be repeatedly used, and the material consumption is reduced.

The utility model relates to the technical field of motor stators, in particular to a stator punching sheet which comprises an integrally annular yoke portion, tooth portions evenly distributed along the circumference are arranged in the yoke portion, a tooth groove is formed between every two adjacent tooth portions, one side, close to the yoke portion, of each tooth groove is in an arc shape, the other ends of the tooth portions are all provided with shoe portions, and the shoe portions are arranged on the yoke portion. The shoe part is arc-shaped, the arc length of the shoe part is smaller than that of one side, close to the yoke part, of each tooth groove, and heat dissipation grooves are evenly distributed in the surface, corresponding to the tooth grooves, of the yoke part. The torque output by the motor can be effectively improved, and meanwhile the service life of the motor can be prolonged.

This invention relates to the field of transverse flux motor technology, and more particularly to a miniature transverse flux motor, comprising a motor housing and an electromagnetic core assembly. The electromagnetic core assembly includes a first stator core, a second stator core, and a magnetic ring disposed between the first and second stator cores. Both the first and second stator cores include several horseshoe-shaped stator blocks arranged in a circular pattern, and each stator core contains a coil winding. The magnetic ring includes a rotor body, a shaft, and permanent magnets. The shaft is coaxially fixed to the center of the rotor body, and the permanent magnets are evenly distributed at equal angles along the circumference of the rotor body. This invention employs a transverse flux structure with upper and lower double stators and a central magnetic ring. During operation, this is equivalent to two motors working collaboratively, significantly increasing the motor's output torque within the constraints of a miniature structure, effectively solving the problem of insufficient torque in existing miniature stepper motors and coreless motors.

This invention relates to a distributed drive mechanism and its shift control method. The distributed drive mechanism includes two drive units, each comprising a motor and a transmission component. The motor outputs power through the transmission component. The two transmission components in the two drive units share a common rotation axis, and are engaged or disengaged via a coupling clutch. When the coupling clutch is disengaged, the two drive units operate independently, providing torque vectoring capability to distribute different torques to the left and right wheels, assisting the vehicle in following the steering wheel's intent. Furthermore, since the two drive units drive the left and right wheels separately, the power requirement of a single motor is low, allowing for the selection of a smaller motor, thereby reducing motor size and weight, and lowering costs. When the two transmission components are engaged via the coupling clutch, they rotate synchronously. The two drive units are coupled together, locking the left and right wheels as a single unit rotating synchronously, achieving the function of a differential lock, which can meet the power requirements under certain operating conditions.

The utility model discloses a height adjusting device for automobile detection platform relates to automobile detection platform technical field. The height adjusting device for automobile detection platform includes the mount, the upper portion of mount is provided with adjusting mechanism: drive assembly, including fixed mounting on the upper portion of mount and is increased height frame, the upper portion fixed mounting of height frame has the shell, the upper end fixed mounting of shell has the top, the upper portion fixed mounting of top has drive motor, rotates through drive motor and drives gear, and two groups of planetary gears are under the double restraint of the tooth profile structure of shell inner wall and drive gear, transmission frame bottom gear -like convex, revolve around drive gear, and also carry out autogyration, realize deceleration and increase the moment, and the tooth profile convex of transmission frame bottom and the planetary gear of output frame upper portion secondary reduce output speed and improve output torque, so that drive motor can select low output torque's model, thereby reduce the volume of drive motor, avoid the device volume too big.

This invention belongs to the technical field of pneumatic actuators, specifically relating to a single-acting pneumatic actuator with ultra-high torque. It includes a spring module, a cylinder module, and a housing module. The housing module includes a housing and a shift fork. Two guide rods are symmetrically fixed inside the housing, and a guide block is slidably connected to each guide rod via an oil-free bearing. This invention can both increase output torque and allow for a relatively small size of individual spring modules. It achieves a large thrust design with small-sized springs, meeting the requirements of ultra-high torque actuators, and also allows for better conversion of spring compression force into thrust, resulting in high conversion efficiency and a comprehensive improvement in output torque. Furthermore, this invention allows for flexible adjustment of the number of spring modules used according to different loads, thereby reducing usage and extending overall lifespan. Simultaneously, it can quickly detect abnormal spring deformation locations, facilitating timely maintenance and preventing load control failures.

The application discloses a loop shuttle transmission mechanism of a computerized embroidery machine and belongs to the technical field of transmission mechanisms of computerized embroidery machines. The loop shuttle transmission mechanism comprises a first shaft, a second shaft, a driving module, a tracking module and a limiting module which are arranged between the first shaft and the second shaft, and a synchronous transmission mechanism can be arranged between the first shaft and a driving motor according to the actual situation of the embroidery machine. The loop shuttle gear shaft is continuously positively and reversely moved through three times of transmission and reversing of the rotary motion of the first shaft. The tracking module and the limiting module are arranged on the second shaft, the second shaft tracks the operation of the loop shuttle gear shaft, the output torque applied to the second shaft is increased, the purpose of stably driving the loop shuttle gear shaft to be positively and reversely rotated at high frequency is achieved, the rotation speed of the first shaft is further increased, the purpose of increasing the positive and reverse rotation frequency of the loop shuttle gear shaft is achieved, and the working efficiency of the embroidery machine is improved.

The utility model discloses a single-motor three-gear electric drive axle with balanced weight distribution and a vehicle, which belong to the technical field of new energy automobile electric drive systems and comprise a drive motor, an input shaft, an intermediate shaft component, a transmission gear set, a differential mechanism assembly and a half shaft, and the intermediate shaft component, the transmission gear set, the differential mechanism assembly and the half shaft are arranged on two sides of the axle. The driving motor is connected with the input shaft, and the intermediate shaft assembly and the transmission gear set are arranged on the two radial sides of the half shaft correspondingly. The input shaft selectively transmits power to a second-third-gear intermediate shaft or a first-gear intermediate shaft of the intermediate shaft assembly through the transmission gear set and the gear selection mechanism. Power of the differential mechanism assembly is transmitted to the planet row speed reducing mechanism through the transmission gear set, output to the differential mechanism shell and output drive through the half shaft. The transmission gear and the shaft system are arranged on the two sides of the axle to balance the weight, the time of the motor running in an efficient interval is prolonged through three-gear speed change, energy consumption is reduced, the large reduction ratio is obtained through the planet row speed reducer, the wheel end output torque is improved, and practicability and adaptability are achieved.

The utility model provides a hollow bearing seat configuration structure of double one-way clutch of middle motor of electric bicycle, it contains: a hollow bearing seat and two one-way transmission devices with two different diameters, there is a flange outside the hollow bearing seat to combine with the chain tooth disc frame of pedal shaft, the hollow bearing seat is sleeved on the pedal shaft, and the smaller end of its diameter supports the first one-way transmission device, the one-way transmission device is directly integrated in the outer cover of motor, and the outer diameter of one end is sleeved with the planetary gear seat of motor reduction mechanism, the first one-way transmission device, on one hand, transmits the electric power of motor to the chain tooth disc frame of bicycle, and on the other hand, the rider's riding without electric power will not be affected by the magnetic hysteresis effect in the motor.