361 results about "Rotor magnets" patented technology

According to the implantable magnetic suspension blood pump, an impeller is suspended in a containing cavity of a pump shell and can rotate around the central axis of the pump shell, and a motor comprises a motor stator assembly arranged in the pump shell and a rotor magnet array arranged on the impeller; the magnetic suspension device comprises an electromagnet arranged in the pump shell and a suspension magnet assembly arranged on the impeller. Active electromagnetic suspension force provided by the electromagnet and passive permanent magnet bias suspension force provided by the suspension magnet assembly act together to enable the impeller to maintain a balanced suspension state in the axial direction and the radial direction. The motor and the magnetic suspension device are independently controlled to effectively reduce the negative influence of low signal detection accuracy caused by magnetic field coupling, and the hybrid magnetic suspension structure reduces the power consumption of the magnetic suspension device; the arrangement mode of the electromagnet and the motor stator assembly enables the whole structure to be compact, and the size and the weight of the blood pump are reduced; the suspension position of the permanent magnet is accurately controlled by accurately controlling the gap and the position relation between the electromagnet and the suspension magnet assembly.

According to the implantable magnetic suspension blood pump structure, an impeller is suspended in a containing cavity of a pump shell and can rotate around the central axis of the pump shell, and blood is sucked in from an inlet and discharged from an outlet; the motor comprises a motor stator assembly arranged in the pump shell and a rotor magnet array arranged on the impeller. The magnetic suspension device comprises an electromagnet arranged in the pump shell and a suspension magnet assembly arranged on the impeller, and electromagnetic suspension force provided by the electromagnet and passive permanent magnet bias suspension force provided by the suspension magnet assembly jointly maintain suspension balance of the impeller. The motor and the magnetic suspension device are independently controlled, so that the negative influence of low signal detection accuracy caused by magnetic field coupling is effectively reduced; the hybrid magnetic suspension structure reduces power consumption of the magnetic suspension device; the arrangement positions of the motor stator assembly and the electromagnet enable the blood pump to be compact in structure and reduce the size and weight; the gap and the position of the electromagnet and the suspension magnet assembly are accurately controlled, accurate control over the suspension position of the permanent magnet is achieved, and the pumping efficiency and stability of the blood pump are improved.

The magnetic suspension blood pump is high in integration level, small in magnetic field coupling degree and high in regulation and control precision and comprises a pump shell, an impeller, a motor unit and a magnetic suspension unit, and the axial suspension state of the impeller is jointly maintained through the magnetic acting force between an electromagnet assembly and a suspension magnet assembly and the magnetic acting force between a motor stator assembly and a motor rotor magnet; the repulsive force of the static magnetic ring array and the movable magnetic ring array maintains the radial suspension state of the impeller. The magnetic suspension unit and the motor unit are arranged at the upper end and the lower end of the impeller respectively, the distance between the magnetic suspension unit and the motor unit is increased in space, the magnetic coupling effect between the magnetic suspension unit and the motor unit is greatly reduced, control difficulty is remarkably reduced through independent control of the magnetic suspension unit and the motor unit, and system stability is improved. The special structural design improves the space utilization rate, reduces the size of the pump body, disperses a heat source and reduces the heat dissipation pressure; the bias magnetic field provided by the suspension magnet provides open-loop magnetic force in the axial direction, the closed-loop control force needing to be provided by the electromagnet assembly is greatly reduced, and the purposes of saving energy and reducing consumption are achieved.

The invention discloses a position-sensorless axial magnetic field permanent magnet synchronous motor system with low rotational inertia, which comprises an axial magnetic field permanent magnet synchronous motor and a position-sensorless control system, and is characterized in that the axial magnetic field permanent magnet synchronous motor comprises a static rotor magnet yoke, a stator and a rotor, and the rotor is arranged on a motor shaft; the rotor is located between the static rotor magnet yoke and the stator, air gaps are formed between the rotor and the static rotor magnet yoke and between the rotor and the stator, the rotor comprises a plurality of magnetic steels, magnetic conductive patches and a rotor core, the magnetic conductive patches are attached to the surfaces of the magnetic steels, the contact surfaces of the magnetic conductive patches and the magnetic steels are arc-shaped, and the magnetic conductive patches are in a middle concave shape. The magnetic steel is attached to or embedded into the surface of the rotor iron core at equal intervals, and the position-sensorless control system is used for achieving driving control over the axial magnetic field permanent magnet synchronous motor. The high-permeability patches are attached to the surfaces of the rotor permanent magnets, and the salient pole effect of the motor is remarkably improved by enhancing the magnetic permeability of a magnetic circuit, so that the rotor position estimation precision is optimized.

The invention discloses a miniature disc type motor and a miniature fan thereof, the miniature disc type motor comprises a PCB stator assembly and a driving control circuit, the PCB stator assembly comprises a PCB and a stator coil arranged on the PCB, the stator coil is connected with the driving control circuit, and the driving control circuit is connected with the PCB. The structural layout of the stator coil and the rotor magnet adopts a two-phase four-slot six-pole, three-phase six-slot four-pole or three-phase six-slot eight-pole structural layout, and better slot-pole matching of the miniature disc type motor is adopted, so that unbalanced radial magnetic pulling force is reduced, the torque fluctuation of the motor is improved, the vibration noise of a product is reduced, the sound quality of the product is improved, and the service life of the product is prolonged. The protrusion ratio of the product can be reduced to below 4dB; the optimized three-phase six-slot quadrupole can improve the motor efficiency by about 5%, the optimized three-phase six-slot octupole can improve the motor efficiency by about 12%, the optimized two-phase four-slot six-pole structure can improve the motor efficiency by about 5%, in addition, the overall layout is reasonable, the winding space is effectively increased, miniaturization and flattening of the miniature fan are better facilitated, and the service life of the miniature fan is prolonged. The size is further reduced.

A method for estimating a temperature of a magnet of a rotor, the rotor comprising a channel circulating a heat transfer fluid in contact with or near the magnet, between an inlet section of the channel and an outlet section of the channel, a temperature sensor being arranged in the channel, in particular in the vicinity of the outlet section of the channel, the method comprising: • a partial or total reduction, for a given duration, of a flow rate of the heat transfer fluid circulating in the channel, • a measurement, by the temperature sensor, of a temperature of a given heat transfer fluid which has stayed in the channel throughout the given duration, and • a determination of an estimated temperature of the magnet as being a sum of the measured temperature of the given heat transfer fluid and of a zero or non-zero constant temperature difference.

The present invention discloses a magnetic gear and a magnetic gear composite motor with a multi-slot rotor, belonging to the field of power transmission technology. The magnetic gear comprises an inner rotor, a magnetic adjustment ring, and an outer rotor; an air gap is provided between the magnetic adjustment ring and both the inner and outer rotors; the inner rotor comprises an inner rotor yoke having N1 inner rotor magnetic steel slots uniformly distributed along the circumference on the outer side, and N1 inner rotor magnets embedded in the inner rotor magnetic steel slots; the magnetic adjustment ring comprises M magnetic conductive units uniformly distributed along the circumference; the outer rotor comprises an outer rotor yoke and N2 outer rotor magnets; the inner side of the outer rotor yoke comprises N2 outer rotor magnetic steel slots uniformly distributed along the circumference, and the outer side comprises N2 idle outer rotor slots, with the N2 outer rotor magnets respectively embedded in the N2 outer rotor magnetic steel slots; the centripetal axes of the corresponding slots on the inner and outer sides of the outer rotor coincide. The present invention can solve the problems of large structural losses, low efficiency, and high mass existing in traditional concentric magnetic gears and magnetic gear composite motors.

A motor control device of the present invention is connected to a power converter for converting power from direct current power to alternating current power, and controls the drive of an alternating current motor that is driven using said alternating current power, and the motor control device is provided with: a carrier wave generator; a carrier wave frequency adjuster that adjusts the frequency of the carrier wave; and a gate signal generator that uses the carrier wave to pulse width modulate a voltage command according to a torque command, and generates a gate signal for controlling operation of the power converter, wherein the carrier wave frequency adjuster adjusts the voltage command and carrier wave phase difference to reduce eddy current loss generated in rotor magnets of the alternating current motor according to a d-axis current flowing to the alternating current motor and the rotational speed of the alternating current motor.

The utility model relates to the technical field of rotor magnetic sheet assembling, and particularly discloses rotor magnetic sheet assembling equipment which comprises a magnetic sheet disc, a plurality of sliding grooves are formed in the magnetic sheet disc and used for containing magnetic sheet sets, an insertion disc is arranged in the center of the top of the magnetic sheet disc and comprises a rotor containing part, and the rotor containing part is used for containing rotor magnetic sheets. The rotor placing part is provided with a plurality of magnetic sheet grooves matched with the single magnetic sheets, and the plurality of magnetic sheet grooves are in butt joint with the sliding grooves respectively; the clamping assembly is used for clamping the rotor located at the rotor placing part; the fixing device is used for fixing the clamped rotor; and the plugging device comprises a plugging piece which is coaxial with the magnetic sheet disc, and the plugging piece is used for enabling the magnetic sheets located in the sliding grooves to penetrate through the magnetic sheet grooves and be inserted into the rotor. The motor rotor magnetic sheet loading device solves the problems that in the prior art, the loading process of motor rotor magnetic sheets mainly depends on manual operation, a large number of manpower resources are consumed, and the risk that fingers of workers are pinched exists.

The invention discloses a magnetic suspension rotor impeller, a pump head and a magnetic suspension pump, the magnetic suspension rotor impeller comprises a rotor main body and a magnetic suspension rotor, the rotor main body is cylindrical, a first cavity is formed in the rotor main body, and the magnetic suspension rotor is sealed in the first cavity; the magnetic suspension rotor comprises a rotor magnet and a nano ceramic composite coating, and the nano ceramic composite coating comprises a metal coating in contact with the rotor magnet and a nano ceramic coating arranged outside the metal coating. By forming the nano ceramic composite coating on the surface of the rotor magnet, the problem that the plastic coating cannot play a role in protection due to damage to the plastic coating in the assembly process is solved, so that the service life of the magnetic suspension rotor impeller can be prolonged, metal coating ions are prevented from being separated out to pollute a pumping medium, and the cleanliness of the pumping medium is ensured.

The invention discloses a rotor assembly, an axial flux motor and a vehicle. The rotor assembly comprises a rotating disc, a rotor iron core, rotor magnetic steel and a rotor framework which are sequentially arranged in the axial direction of the rotor assembly. The rotating disc serves as an output part of the rotor assembly and is used for outputting power of the rotor assembly. The rotating disc is provided with an inner cavity, the rotor iron core and the rotor magnetic steel are both located in the inner cavity of the rotating disc, the rotor framework is connected with the rotating disc, the rotor framework and the rotating disc jointly axially limit the rotor iron core and the rotor magnetic steel, and the rotor iron core and the rotor magnetic steel are prevented from sucking when the rotor assembly is assembled to form an axial magnetic flux motor. The rotor iron core is clamped between the rotating disc and the rotor magnetic steel along the axial direction, the rotor iron core is made of a soft magnetic material and serves as a partition between the rotor magnetic steel and the rotating disc, and compared with a scheme without adding the soft magnetic material, the eddy current loss can be effectively reduced by 85% through the structural design.

The utility model relates to the technical field of motors, in particular to a novel brushless direct current motor, which comprises a rotor assembly (100), a stator assembly (200), a first end cover (300) and a second end cover (400), the rotor assembly (100) comprises a rotor (101), a rotor shaft sleeve (102) and rotor magnetic steel (103), and the rotor shaft sleeve (102) is made of aluminum materials; the second end cover (400) is provided with a Hall plate (500), and the Hall plate (500) is provided with three surface-mounted Hall elements (501) used for sensing the rotor magnetic steel (103). Due to the adoption of the structural design, the rotor shaft sleeve of the rotor assembly is made of an aluminum material, so that the distribution of magnetic lines of air gaps in the motor is changed, and the problems of large cogging torque and noise of the motor are effectively solved; a Hall element on the Hall plate directly induces motor rotor magnetic steel in a patch mode, so that the reliability of the motor is greatly improved, the structure is simplified, and assembly is facilitated.

A rotor (1) for an electric machine (2) of a motor vehicle (4) comprises a rotor body (5) having a plurality of rotor magnets (7) extending axially through the rotor body (5) and located in magnet pockets (6). Each rotor magnet (7) is fixed by means of a plastic body (8) extending in the magnet recess (6). Also located in the rotor body (5) is a plurality of axial cooling channels (9) through which a liquid cooling fluid (10) can flow. Each cooling channel (9) has an outlet opening (11) in an end face of the rotor body (5), and a cooling fluid (10) is discharged from the cooling channel (9) to the periphery of the rotor when the rotor (1) is in operation. In this case, the at least one plastic body (8) axially protrudes out of the rotor body (5) via the fluid guiding element (12) and thus interacts with one of the outlet openings (11), such that the cooling fluid (10) exiting the outlet opening (11) is subjected to an axial force component due to the fluid guiding element (12) of the plastic body (8) when the rotor (1) is in operation.

The invention relates to a rotor (9) for an electric machine (1a.. 1c), comprising a rotor shaft (10) with an axial central bore (14) and a radial outlet opening (15) connected thereto. The rotor (9) additionally comprises a laminated rotor core (11) which is mounted on the rotor shaft (10) and has a plurality of rotor laminations (12, 12a, 12a', 12b) stacked axially one on top of the other and a plurality of rotor magnets (17.. 17b'), which are arranged, in the laminated rotor core (11), in a plurality of magnet groups (F1.. F3), each of which is associated with a different pole of the rotor (9). In the laminated rotor core (11), a radial cooling channel (16), the inlet opening of which lies opposite the outlet opening (15), runs through a plurality of cutouts (E1, E3, E5) in a first rotor lamination (12a, 12a') and at least one cutout (E2, E4, E6') in a second rotor lamination (12a, 12a') adjoining the first rotor lamination (12a, 12a'). The invention further relates to an electric machine (1) having such a rotor (9), to a vehicle (27) having such an electric machine (1), to a method for operating the electric machine (1), and to a method for producing such a rotor (9).

The application relates to the technical field of motors, in particular to a rotor magnetic ring and a hollow cup motor. The rotor magnetic ring is a polar anisotropic magnetic ring, which comprises at least two pairs of magnetic poles, each pair of the magnetic poles is oppositely arranged on the two sides of the rotor magnetic ring, and the magnetic properties of adjacent magnetic poles are opposite; each magnetic pole comprises at least two magnetic force units arranged along the circumference of the magnetic pole in sequence, the magnetization directions of adjacent magnetic force units have a deflection angle beta, and the magnetization directions of all the magnetic force units are arranged along the circumference with the deflection angle beta, so that the magnetic field intensity on the outer side of the rotor magnetic ring is greater than that on the inner side, the magnetic field energy is concentrated in an effective working area, and the overall working performance of the hollow cup motor is improved.

The invention relates to the technical field of permanent magnet materials, in particular to a method for increasing resistance of a permanent magnet, which comprises the following steps of: (1) weighing raw materials, smelting and refining to obtain alloy melt; (2) the alloy melt is subjected to cooling, powdering, forming, sintering treatment and aging treatment, cooling is conducted, and a samarium cobalt blank is obtained; (3) the samarium cobalt blank is subjected to machining grinding, slicing, end face grinding, cleaning and drying, and a plurality of flaky magnets are prepared; sequentially performing argon plasma treatment and nitrogen plasma treatment on each end surface of the flaky magnet, and sputtering a boron nitride layer and a silicon dioxide layer on the end surface of the flaky magnet by adopting a magnetron sputtering method; and carrying out annealing treatment, bonding and curing treatment to obtain the high-resistance permanent magnet. According to the method for increasing the resistance of the permanent magnet, the resistance of the rotor magnet can be effectively increased, and eddy current generated by the motor rotor magnet is further reduced.

The utility model provides a water pump plastic magnetic rotor, which relates to the field of water pump parts and comprises a rotor magnet and a blade structure which are integrally formed, a blade cover is arranged on the blade structure, a bearing is arranged in the rotor magnet, a supporting structure is arranged on the top surface of the inner wall of the blade cover, and the lower end surface of the supporting structure is matched with the curved surface of the upper end surface of the blade structure in shape. The supporting structure is used for providing contact supporting between the blade cover and the blade structures, and positioning structures with the same number as the blade structures are arranged on the supporting structure. Stable contact support is provided between the blade cover and the blade structure through the supporting structure, it is ensured that the relative positions of the blade cover and the blade structure are stable in the water pump operation process, the positioning structure is matched to ensure the relative position precision between the blade and the blade cover, and therefore the operation efficiency and stability of the water pump are improved.

The fan comprises a motor, an impeller and a shell which are sequentially arranged from inside to outside, the motor comprises a rotating shaft, a stator and a rotor which are sequentially arranged from inside to outside, the impeller comprises an impeller body and a first impeller middle disc, and the first impeller middle disc is fixedly connected with the impeller body on one side face of the impeller body; one axial end of the rotating shaft is inserted into the first impeller middle disc, and the other axial end of the rotating shaft is rotatably connected with an end cover of the volute; the rotating shaft is rotatably connected with the stator; the rotor comprises rotor magnetic steel and a rotor yoke arranged on the outer side of the rotor magnetic steel in a sleeving mode, the rotor yoke and the first impeller middle disc are integrally formed, and the rotor magnetic steel is fixedly connected with the rotor yoke. According to the draught fan and the range hood comprising the draught fan, the motor and the impeller are connected without installation holes or fasteners such as screws and pins, the connecting structure is simplified, the connecting and assembling steps are omitted, and therefore the assembling efficiency is improved, and the cost is reduced.

A quadruped robot joint power module includes a housing, and a motor and a reducer arranged in the housing, wherein the motor includes a stator core inner ring and an outer rotor magnet holder, and the reducer includes a sun gear, a planetary gear, a planetary gear support shaft, a planetary reducer gear ring, and a torque output flange. The stator core inner ring is fixedly arranged in the housing, the outer rotor magnet holder is sleeved on the circumference of the stator core inner ring, the torque output flange is rotatably arranged on the housing, the planetary gear support shaft is fixedly arranged on the torque output flange, the planetary gear is sleeved on the circumference of the planetary gear support shaft, the sun gear is fixedly arranged on the outer rotor magnet holder, a plurality of the planetary gears are arranged around the circumference of the sun gear, and the planetary reducer gear ring is fixedly arranged in the housing and sleeved on the circumference of a plurality of the planetary gears. The motor and reducer of the present invention are integrated, which reduces space occupation and has a fast joint response speed.

The utility model discloses a portable electric fan. A fan wheel and a wheel-shaped mounting seat are arranged in a first cylindrical shell, a front cover is arranged at a front port, and a rear cover is arranged at a rear port. A rotor magnet is arranged in a first barrel-shaped hub part of a fan wheel, and a motor rotating shaft is arranged in the center of a barrel bottom. The wheel-shaped mounting seat comprises a cylindrical contour part, a second cylindrical hub part and a plurality of first plate-shaped spokes. And a tubular mounting seat is arranged at the center of the barrel bottom of the second barrel-shaped hub part. A motor rotating shaft is assembled in the tubular mounting seat, and a stator coil is sleeved outside the tubular mounting seat. The front cover is embedded into the front end of the cylindrical contour part and comprises a front cover hub part and a plurality of second plate-shaped spokes. The first plate-shaped spokes and the second plate-shaped spokes form a plurality of flow guide plates in a one-to-one correspondence mode, and air outlet airflow can be concentrated.

Aspects of the present disclosure relate to an electric motor that provides cooling with flow of fluid through a passage containing a magnet of a rotor. The flow is first directed from the shaft to the inner passage. The flow flows from the inner passage to a magnet passage at an axial middle portion of the rotor and moves in opposite axial directions. This provides symmetry of the flow.

This application relates to a blood pump system, particularly a ventricular assist device (VAD). The system includes a blood pump, which comprises: a housing that includes an inlet and an outlet, preferably axial inflow and tangential outflow; a motor actuator, wherein the motor includes a plurality of motor coils (for driving an impeller); and an impeller, wherein the impeller is located within the housing and includes a plurality of rotor magnets. The system further includes: a drive circuit; and a control unit configured to control the operation of the pump. The control unit is configured to: operate the motor such that the impeller rotates about an axis; and measure the position of the rotor in a direction along the axis using at least one of the plurality of motor coils.

The utility model discloses a motor direct drive pump, and relates to the technical field of drive pumps, a stator assembly, a rotor assembly, a main shaft assembly and a piston assembly are installed in a shell assembly, the stator assembly is fixed on the shell assembly, a rotor magnet is installed on a connecting disc of the rotor assembly in a positioning mode, and the rotor magnet is arranged on the periphery of the stator assembly in a surrounding mode. The main shaft assembly is rotationally assembled in an inner cavity of the shell assembly, circumferentially fixed to the connecting disc and used for achieving driving rotation, and due to the fact that the rotor assembly has the larger radial size, larger torque can be provided; the main shaft assembly is provided with an eccentric driving part, the piston assembly is slidably assembled in the piston cavity, and when the main shaft assembly rotates, the eccentric driving part drives the piston assembly to do reciprocating linear translation, so that pumping is achieved; a motor structure and a pump structure are integrated with each other, so that the structure of the pump body is simplified, higher integrity is achieved, the rotor assembly has larger radial size, and the size of the whole machine can be reduced under the condition that the same torque is output.

The present application relates to a media gap motor (10) and also a fuel cell system (1) comprising a media gap motor (10). The application additionally relates to a use of the media gap motor (10) and of the fuel cell system (1). The proposed media gap motor (10), for example for a fuel cell system (1), has a shaft (15), in which there is accommodated a rotor magnet (22). The media gap motor (10) additionally has a stator with stator windings (23) for electrically driving a rotation of the shaft (15). The media gap motor (10) furthermore has a housing (26), which delimits a flow space (11) formed between the shaft (15) and the stator. The media gap motor (10) further has an impeller (13) disposed in the flow space (11) and on the shaft.

Rotor (1) of an electric machine (2), in particular for a drive train (3) of a motor vehicle (4), comprising a rotor body (5) with a plurality of magnet pockets (6) extending axially through the rotor body (5), in each of which at least one rotor magnet (7) is received, and the rotor magnets (7) are each fixed by means of a plastic body (8) extending in the magnet pockets (6), wherein the rotor body (5) further comprises a plurality of cooling channels (9) extending axially through the rotor body (5), through which a cooling fluid (10) can flow, wherein the cooling channels (9) have an end-face outlet opening (11) in the rotor body (5), from which, during operation of the rotor (1), the cooling fluid (10) is discharged from the cooling channels (9) into the rotor environment, wherein at least one of the plastic bodies (8) with a fluid guide element (12) projects axially out of the rotor body (5) and thus connects with one of the outlet openings (11). interactsthat during operation of the rotor (1) the cooling fluid (10) exiting from the outlet opening (11) is subjected to an axial force component by the fluid guiding element (12) of the plastic body (8), wherein two circumferentially adjacent magnetic pockets (6) in the cross-section of the rotor body (5) each have a V-shaped arrangement (15) with a radially inwardly pointing tip, where The plastic bodies (8) of two circumferentially adjacent V-shaped arrangements (15) emerge axially from the magnet pockets (6) at the first end face (13) of the rotor body (5) and form a substantially W-shaped contour in cross-section, wherein the fluid guide element (12) is formed at the radially outwardly pointing tip (16) of the W-shaped contour.

The application discloses a forward and reverse clock movement, which comprises a shell, an MCU controller, a transmission structure, a first coil motor, a second coil motor and a rotor magnet which are arranged in the shell; the transmission structure comprises multiple-stage gears which are sequentially and mutually meshed, and a gear for being connected with a pointer is a pointer gear; the rotor magnet is fixedly connected with a first-stage gear of the multiple-stage gears; the MCU controller inputs a first driving pulse current into a first coil of the first motor coil to generate a magnetic field so as to make the first-stage gear rotate, and further make the pointer gear rotate forward; the MCU controller inputs a second driving pulse current into a second coil of the second motor coil to generate a magnetic field so as to make the first-stage gear rotate, and further make the pointer gear rotate reversely. When time needs to be corrected, a direction with a small rotation amplitude of the pointer is selected to be adjusted forward or reversely, so that the time can be corrected more quickly and accurately.

The utility model discloses a rotor magnet and rotor core positioning structure of an inner rotor brushless motor, and relates to the technical field of brushless motors. The motor comprises a motor main body, a crankshaft is arranged in the motor main body, a rotor magnet and a rotor iron core are respectively arranged in the motor main body, the rotor magnet is arranged in the rotor iron core, the rotor magnet is of a cylinder structure, a first limiting plane is arranged on the side face of the rotor magnet, and the rotor iron core is of an annular structure. The inner wall of the rotor core is provided with a second limiting plane, and the first limiting plane is matched with the second limiting plane. According to the utility model, the rotor magnet is of a cylindrical structure, and the first limiting plane of the rotor magnet corresponds to the second limiting plane of the rotor iron core, so that when the bonding strength is unqualified due to less glue used for positioning or non-uniform coating, the bonding strength is not qualified; and the first limiting plane and the second limiting plane which are arranged between the rotor magnet and the rotor iron core are mutually limited and positioned.

The invention relates to a radial magnetic flux dual-rotor active heat dissipation frameless torque motor, and belongs to the technical field of frameless torque motors, the radial magnetic flux dual-rotor active heat dissipation frameless torque motor comprises a rotor assembly and a stator assembly, the rotor assembly comprises an inner rotor steel sleeve and an outer rotor steel sleeve, an inner rotor magnet is arranged on the inner rotor steel sleeve, an outer rotor magnet is arranged on the outer rotor steel sleeve, the stator assembly comprises a lower fixing plate, a coil winding is arranged on the upper side of the lower fixing plate, and an upper fixing plate is arranged on the upper side of the coil winding; the rotational inertia of the rotor can be improved through the plurality of inner rotor magnets and the plurality of outer rotor magnets, the size of the motor is reduced, the space utilization rate is improved, the motor is compact in structure, high in slot fullness rate and high in efficiency, the motor can actively dissipate heat through the heat dissipation blades, manufacturing and winding are extremely convenient, and mass production is facilitated.

The invention discloses a method for eliminating local working hot spots of a high-temperature superconducting rotor magnet, and the method comprises the steps: dividing a cold helium circulation channel into a plurality of heat management units according to the real-time temperature value and temperature gradient of each position of the magnet, and periodically calculating the comprehensive severity index of each unit; and when the temperature of a certain unit exceeds a hot spot temperature threshold value or the temperature gradient exceeds a hot spot gradient threshold value, the unit is judged as a local working hot spot. After the hot spot is judged, valve opening degrees of a shunting branch and a diversion branch which are connected with the hot spot unit are adjusted through cooling capacity priority scheduling, and on the premise that the total flow is basically unchanged, the flow of cold helium flowing through the hot spot unit is increased in a self-adaptive mode, and the flow of a low-load unit is reduced; and meanwhile, high-temperature cold helium subjected to heat exchange with a hot spot is preferentially led out of a circulating system or led to a special heat dissipation branch through a flow guide branch, flow distribution is recovered in combination with overall temperature gradient feedback, and rapid transfer and lead-out of local heat are achieved. According to the invention, local working hot spots can be effectively eliminated.

To provide a blood pump that is easy to handle.SOLUTION: A blood pump comprises: a flexible drive shaft (3); a conveying element (6) connected to the drive shaft (3) in a distal region of the drive shaft (3); and a motor (7). The motor (7) comprises a stator (36), and a rotor (30). The stator (36) comprises a winding (37). The rotor (30) comprises a rotor magnet (31). The drive shaft (3) is connected to the rotor (30) at a proximal end part of the drive shaft (3). The stator (36) and the rotor (30) are non-detachably connected to each other, and form a gap (40) defined by the rotor (30) and the stator (36).SELECTED DRAWING: Figure 5