13results about How to "Reduce torque fluctuation" patented technology

The invention relates to the technical field of motors, in particular to a stator punching sheet, a stator iron core comprising the stator punching sheet and an external rotor motor comprising the stator iron core. The stator punching sheet is annular, twelve stator tooth grooves used for winding stator windings are evenly formed in the outer periphery of the stator punching sheet at intervals in the circumferential direction, the diameter of the outer circle of the stator punching sheet is D1, the diameter of a virtual circle concentric with the outer circle on the stator punching sheet is D2, D2 / D1 is equal to 0.45-0.5, the area of an annular area between the outer circle and the virtual circle is the effective magnetic circuit area, and D1 is larger than D1 and smaller than D2. The stator tooth grooves are located in the annular area, and the proportion of the total area of the 12 stator tooth grooves to the effective magnetic circuit area is 0.45-0.5. The effective size of the motor can be reduced, the torque ripple of the motor is reduced, and the operation efficiency of the motor is improved.

The application provides a function type hybrid control method of an electric special vehicle driving motor, which combines a fuzzy PID algorithm and a conventional PID control algorithm through a switching function to obtain the comprehensive advantages of the two control algorithms. Meanwhile, in order to reduce the calculation burden and execution time of the controller and facilitate engineering implementation, a fuzzy proportional algorithm with the transient performance of the fuzzy PID algorithm is adopted instead. According to the operating conditions of the special vehicle, the operating state of the motor is segmented for research, and a set of rules or a separate fuzzy algorithm is used to determine the weight of the outputs of the two control algorithms. However, an additional fuzzy calculation is required, which increases the calculation time and gain constant adjustment, reduces the switching frequency of the control system, causes higher torque fluctuation, and further designs a switching function to calculate the output weight control of the two algorithm outputs, which not only reduces the torque fluctuation caused by redundant calculation, but also ensures that the vehicle driving motor works in the optimal control state.

The utility model relates to wind power generation technical field discloses wind power generation device, including support subassembly, wind wheel subassembly and power generation subassembly, wind wheel subassembly includes main shaft and impeller, and the main shaft fixed mounting is in support subassembly, and the impeller rotatablely installs on the main shaft, power generation subassembly includes first power generation unit and second power generation unit, and the stator of first power generation unit and second power generation unit all fixed mounting is in main shaft, and the outer rotor of first power generation unit and second power generation unit all are connected with the impeller fixedly, the utility model under the same wind force condition, first power generation unit and second power generation unit can work simultaneously, and the mechanical energy of impeller capture is more efficient, more fully converts into electric energy, effectively increases the overall power generation, improves the wind energy utilization efficiency and power generation efficiency, solves when the outside wind speed is at the low level, and the overall power generation of generator is insufficient.

The utility model belongs to the technical field of artificial heart-left ventricle auxiliary circulation equipment, and particularly discloses an LVAD motor stator system, which comprises an outer stator, an inner stator and a winding arranged between the outer stator and the inner stator, the inner stator is formed by stacking a plurality of silicon steel ring sheets, an axial modulation groove is arranged along the circumferential direction of the inner side of the inner stator, and the inner side of the inner stator is connected with the winding. According to the utility model, the modulation grooves are arranged in the inner stator, so that the harmonic amplitude is reduced, and the fluctuation of the torque is reduced. The utility model also discloses a motor which is filled with epoxy resin, so that the relative positions of related parts are ensured, the coaxiality and dynamic balance of the related parts are ensured, the motor is stable in high-speed operation, the vibration can be reduced, the motor has relatively good biological safety, relatively high heat conductivity coefficient and chemical stability, and the heat is quickly dissipated when the motor is in high-speed operation. The device is suitable for being placed in a human body.

This invention provides a stator core, a rotary motor, and a drive device. The stator core is a stator core composed of multiple stacked steel plates, including: an annular core back centered on a central axis; and multiple pole teeth extending radially from the core back. The radially facing side of the core back is provided with multiple axially extending welded portions that fix the multiple steel plates together, and axially extending grooves. The multiple welded portions include a first welded portion, a second welded portion, and a third welded portion arranged sequentially in the circumferential direction. The angle formed by the central axis, the first welded portion, and the second welded portion is greater than the angle formed by the central axis, the second welded portion, and the third welded portion. The grooves are disposed between adjacent first and second welded portions in the circumferential direction.

The present application relates to a motor with high electromagnetic compatibility level, comprising a stator assembly, a rotor assembly and an end cover assembly, the stator assembly comprises a metal shell, the rotor assembly comprises a rotor core and a rotor shaft, the end cover assembly comprises an end cover, the shell comprises a first end provided with a bearing chamber and an open second end opposite to the first end, the motor is further provided with a metal cover, the cover is provided with a plurality of retaining tabs on its peripheral edge, the end cover is provided with a plurality of positioning protrusions on its peripheral outer surface, a positioning notch for cooperating with the positioning protrusions and a retaining notch for cooperating with the retaining tabs are arranged at the end edge of the second end of the shell, so that the rotor assembly and the end cover assembly are completely encapsulated in the shell by the cover, so that the motor as a whole is in a metal closed structure. The present application also relates to an automobile seat comprising the above motor. By using the motor according to the present application, electromagnetic radiation of the motor can be more effectively suppressed, and a very high EMC level can be obtained.

This invention discloses a high torque density magnetic harmonic reducer axial permanent magnet servo motor. The axial field-modulated motor includes a stator, a left rotor, a right rotor, permanent magnets, and armature windings. The radial magnetic harmonic reducer includes a stator, an outer rotor, an inner rotor, permanent magnets, and ball bearings. This invention integrates the stator of the magnetic harmonic reducer with the stator of the field-modulated motor, directly connecting them and eliminating the mechanical reducer structure of traditional servo systems, effectively reducing the overall weight of the servo system. The field-modulated motor uses an axial structure to improve the torque density of the servo system. The magnetic harmonic reducer uses a radial structure embedded in the hollow space inside the field-modulated motor to achieve a lightweight, highly integrated servo system design. Both the field-modulated motor and the magnetic harmonic reducer use surface-mounted permanent magnet structures to reduce torque ripple.

The utility model relates to a built-in type tilt U-shaped permanent magnet rotor of displacement, and relates to the motor technical field, and the rotor includes rotor core, be equipped with a plurality of permanent magnet unit on rotor core, permanent magnet unit includes first middle part horizontal magnetic steel group, middle part oblique magnetic steel group and two first side part magnetic steel, first middle part horizontal magnetic steel group and middle part oblique magnetic steel group all include at least two width different one -word type magnetic steel, and the one -word type magnetic steel of first middle part horizontal magnetic steel group is perpendicular to d axle, and the one -word type magnetic steel of middle part oblique magnetic steel group is inclined to set up relative to the one -word type magnetic steel of first middle part horizontal magnetic steel group, and first middle part horizontal magnetic steel group and two first side part magnetic steel form first U-shaped magnetic steel group, and middle part oblique magnetic steel group is arranged at the radial outer side of first middle part horizontal magnetic steel group, and the rotor of the utility model can reduce motor noise and torque fluctuation.

The utility model relates to the technical field of permanent magnet auxiliary synchronous reluctance motors, and discloses a high-efficiency stable permanent magnet auxiliary synchronous reluctance motor, which comprises a base, a motor body is fixedly connected in the base, a heat dissipation opening is formed in the motor body, a stator iron core is fixedly connected in the motor body, and the stator iron core is fixedly connected in the base. A stator winding is fixedly connected to the interior of the stator core, a heat dissipation channel is formed in the interior of the stator core, a rotating shaft is rotatably connected to the interior of the motor body, a rotating block is fixedly connected to the outer wall of the rotating shaft, and an optimized rotor assembly is fixedly connected to the outer wall of the rotating block. According to the utility model, alternating current is introduced through the stator winding to drive the rotor body to rotate, and finally, the magnetic field distribution can be improved, the efficiency of the motor can be improved, the mechanical vibration and noise can be reduced, the stability and comfort of motor operation can be improved, the service life of the motor can be prolonged, and the efficiency of the motor can also be improved.

The application discloses a high-power-density double-stator permanent magnet synchronous motor optimization design method. The method comprises the following steps: determining the stator outer diameter of the double-stator permanent magnet synchronous motor and the inner and outer rotor magnetic circuit topology structure of the rotor; determining the final pole arc coefficient and the stator slot ratio of the outer motor under different pole arc coefficients and stator slot ratios of the outer motor according to the motor average torque, torque fluctuation and motor efficiency; keeping the total amount of permanent magnets unchanged, changing the pole arc coefficient ratio of N and S magnetic poles on the rotor; and determining the final pole arc coefficient ratio according to the change amount of the cogging torque, torque fluctuation and motor average torque under different pole arc coefficient ratios, so as to finally obtain the high-power-density double-stator permanent magnet synchronous motor. The double-stator permanent magnet synchronous motor is optimized and designed, the optimized magnetic pole structure can reduce the torque fluctuation of the motor while keeping high power density, and effectively improves the stability of motor operation.

A combined magnetic pole surface-mounted outer rotor of a permanent magnet hub motor relates to the technical field of motors, a rotor core of the rotor is provided with a plurality of magnetic steel groups, each magnetic steel group is symmetrically arranged around a rotating shaft of the rotor core, and each magnetic steel group comprises first magnetic steel, second magnetic steel and third magnetic steel which are sequentially arranged at intervals along the circumferential direction of the rotor core. The pole arc widths of the first magnetic steel, the second magnetic steel and the third magnetic steel are different; if the pole arc width of the first magnetic steel is a, the pole arc width of the second magnetic steel is b, the pole arc width of the third magnetic steel is c, and the magnetic pole distance among the first magnetic steel, the second magnetic steel and the third magnetic steel is x, a gt exists; bgt; c, a = b + x, and b = c + x. The rotor provided by the utility model can reduce motor noise and torque ripple.

The utility model belongs to the technical field of magnetic suspension motors, and discloses a novel permanent magnet rotor and a magnetic suspension motor, and the novel permanent magnet rotor comprises a longitudinally arranged connecting shaft, and an upper permanent magnet rotor and a lower permanent magnet rotor which are vertically arranged at the two ends of the connecting shaft. The upper permanent magnet rotor is provided with a first annular Halbach array formed by at least two first magnet units in a surrounding mode, the lower permanent magnet rotor is provided with a second annular Halbach array formed by at least two second magnet units in a surrounding mode, and the connecting shaft is of a non-magnetic-conduction structure. The magnetic suspension motor comprises a stator and the novel permanent magnet rotor arranged at the central position of the stator. According to the novel permanent magnet rotor, the annular Halbach arrays are arranged on the upper permanent magnet rotor and the lower permanent magnet rotor, the magnetic field structure is optimized, the magnetic field utilization rate of the permanent magnet material is improved, the output torque of the motor can be increased, the cogging torque can be reduced, the torque fluctuation is reduced, and the operation stability and the operation efficiency of the motor can be improved.

The application relates to the technical field of motor control, and discloses a design method of an outer rotating motor combined with a cylinder and a disc body, which comprises application to a microcontroller; the method obtains the steady-state temperature and the electrical angular velocity of the motor, calculates the thermodynamic load margin and the cross-domain temperature gradient; the cross-domain temperature gradient is used to fine-tune the reference high-frequency injection frequency, and a reconstructed high-frequency voltage instruction is generated; corresponding cross-saturation coupling matrices are obtained in a low-speed area and a medium-high-speed area respectively, and a full-speed-area continuous cross-saturation coupling matrix is generated according to a smooth transition function; an overall loss cost function is constructed based on the instruction torque and the thermodynamic load margin, an extreme value optimization is performed on the current instruction set, and finally a pulse width modulation signal is output. The application introduces the temperature factor into the electromagnetic control process, compensates for the magnetic impedance drift interference, realizes the smooth transition of the high-speed control area and the low-speed control area of the motor, and effectively controls the operation loss of the motor under the limitation condition.