531 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.

The present application relates to the field of beam scanning technology and provides a galvanometer motor and a LiDAR. The galvanometer motor includes a stator assembly, a rotor assembly, a tunneling magnetoresistance sensor, a first magnet, and a second magnet. The stator assembly includes a housing and a stator body, while the rotor assembly includes a rotating shaft, a rotor magnet, and an angle limiting member. The rotating shaft is rotatably mounted in the housing around a first shaft line, with a gap between the rotor magnet and the stator body. The rotor magnet rotates around the first shaft line under the magnetic field of the stator body. The tunneling magnetoresistance sensor can map the limited angles formed by the first angle and the second angle into finite position codes.

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 rotor assembly and an axial flux motor. The rotor assembly comprises a rotor bracket, a rotor iron core, rotor magnetic steel and a fixing piece, wherein the rotor iron core is arranged on the rotor bracket along the axial direction of the rotor assembly; the rotor magnetic steel is arranged on the side, away from the rotor support, of the rotor iron core in the axial direction, the rotor magnetic steel is provided with a plurality of magnetic steel sub-parts, and the multiple magnetic steel sub-parts are arranged in the circumferential direction of the rotor assembly at intervals; the fixing part is arranged on the side, away from the rotor iron core, of the rotor magnetic steel in the axial direction, the fixing part comprises a limiting structure, and the limiting structure is used for limiting the magnetic steel sub-part in the axial direction. According to the rotor assembly, the limiting structure arranged on the fixing piece is matched with the plurality of magnetic steel sub-pieces, so that the connection between the components of each rotor assembly can be reinforced in the axial direction, and the risk that the components fall off from each other is reduced.

The invention discloses a linear joint with a motor-nut-bearing integrated design. The linear joint adapts to operation requirements and motion precision of a humanoid robot. A motor rotor-reverse lead screw nut-bearing integrated design is adopted, a motor rotor magnet is pasted on the outer circle of a nut of a reverse lead screw and fixed through a symmetrical double-spiral reinforcement structure, and the outer circle of the nut is designed to be an inner ring of an angular contact ball bearing, so that the structure is more compact; and high integration, high performance, high precision, high dynamic response and high power density of the linear joint are further realized. The rotating motion of the nut is converted into the linear motion of the lead screw through the reverse lead screw pair, meanwhile, a mechanical zero point is arranged on the encoder side, and the limiting function is achieved. An absolute value type encoder and a tension and pressure sensor are arranged in the linear joint, and the rotating speed, displacement and tension and pressure in the actual movement process can be monitored in real time.

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.

The invention relates to the technical field of light beam scanning, and provides a galvanometer motor and a laser radar. The galvanometer motor comprises a stator assembly, a rotor assembly, a tunnel magnetoresistance sensor, a first magnet and a second magnet, the stator assembly comprises a shell and a stator body, the rotor assembly comprises a rotating shaft, a rotor magnet and an angle limiting piece, the rotating shaft can be rotatably installed in the shell around a first axis, and a gap is formed between the rotor magnet and the stator body; the rotor magnet rotates around a first axis under the action of a magnetic field of the stator body, and the angle limiting piece enables the rotor assembly to rotate between a first angle and a second angle; the first magnet and the second magnet are spaced from the tunnel magnetoresistance sensor. The first magnet and the second magnet rotate along with the rotor assembly and pass through the tunnel magnetoresistance sensor. Wherein the tunnel magnetoresistance sensor can map a limited angle formed by the first angle and the second angle into a limiting code, so that the angular resolution of the rotor assembly is greatly improved.

The utility model provides a ball screw power module, which comprises an assembling mechanism, an output end cover, an assembling nut and a protective end cover, and a driving mechanism, and is characterized in that the assembling mechanism comprises an actuator main shell, an output end cover, an assembling nut and a protective end cover; the first knuckle bearing penetrates through the protection end cover through a force detection unit; the second knuckle bearing penetrates through the assembly nut and the output end cover through a ball screw; and the servo driving mechanism comprises a stator iron core, a stator coil, a rotor magnet, a rotor back iron and a lead screw nut. According to the scheme, an integrated design of a motor structure, a transmission structure and a control structure is finally realized; the lead screw nut serves as a part of an inner rotor in the motor structure, the rotor space of the motor structure is fully utilized, and the size and weight of the joint are reduced. Meanwhile, the transmission efficiency is high, the manufacturing and maintenance cost is low, the structure is simple, and the safety is high.

The utility model discloses a double-station new energy motor rotor automatic magnet inserting device, and belongs to the technical field of motor rotor magnet inserting devices. The utility model discloses automatic magnet inserting equipment for a double-station new energy motor rotor. The automatic magnet inserting equipment comprises a lower frame mechanism, a magnet uploading lower frame mechanism, a motor lifting mechanism, an empty box transferring mechanism, a magnet carrying mechanism, an XYZ transplanting module mechanism, a turntable mechanism, a magnet inserting mechanism and a magnet height measuring mechanism, the utility model has the advantages of strong expandability, safety and reliability, high working efficiency and simple maintenance, can effectively insert the iron core magnet into the motor rotor, and is convenient to use.

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 invention discloses a rare earth permanent magnet magnetic suspension AC / DC motor, wherein the rotor is located inside the stator; a plurality of stator magnets are evenly distributed in the inner ring of the stator, and a plurality of rotor magnets are evenly distributed in the outer ring of the rotor; the magnetic poles of the stator magnets on the side adjacent to the rotor magnets are the same; a stator core is arranged between every two stator magnets, the stator core is fixed to the inner ring of the stator, and the axial direction of the stator core is along the diameter direction of the stator; an input DC three-phase winding is wound on the stator core, that is, the first stator core is wound with a DC first phase U, the second stator core adjacent to the first stator core is wound with a DC second phase V, and the third stator core adjacent to the second stator core is wound with a DC third phase W, and the U, V, and W input ends are set as the same-name ends, and the first group of U, V, and W windings are connected with the same-name ends of the second group of U, V, and W windings, and circulate in sequence. The invention reduces the friction loss of the motor operation, and the motor has high working efficiency and low loss.

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.

The utility model provides a magnetic suspension type ship motor-driven propeller which comprises a rotor, a stator and a flow guide mechanism. The stator comprises a machine shell, a coil fixing frame, a winding coil, a first fixing ring and a first annular magnet. The rotor comprises a magnet fixing frame arranged on the inner side of the coil fixing frame, a rotor magnet arranged on the magnet fixing frame, a propeller fixedly connected to the inner side of the magnet fixing frame, a second fixing ring fixedly connected to one end of the magnet fixing frame and a second annular magnet fixedly connected to the second fixing ring. The first annular magnet and the second annular magnet are opposite in homopolar mode, and the outer wall of the rotor and the inner wall of the stator are both covered with polytetrafluoroethylene films. The flow guide mechanism comprises a water outlet cover fixedly connected to one end of the outlet of the machine shell and a flow guide pipeline fixedly connected to the inner wall of the water outlet cover, flow guide plates are evenly distributed in the flow guide pipeline in the radial direction, the service life can be prolonged, working benefits are improved, and noise is reduced.

The invention discloses a driving assembly and a disc player using the same. The driving assembly comprises a motor, a suspension fixing frame and a rotating shaft. The motor is fixedly arranged on the motor fixing support, and a rotor magnet is fixedly arranged on a rotor of the motor; the rotating shaft is arranged in the rotating shaft fixing hole of the suspension fixing frame and can rotate in the rotating shaft fixing hole; a first magnet is fixedly arranged at one end of the rotating shaft extending into the suspension fixing frame; the first magnet and the rotor magnet attract each other; a fixing frame magnet is arranged on the end face of the side, away from the rotor, of the suspension fixing frame, and the rotating shaft is sleeved with a second magnet repelling the fixing frame magnet. According to the driving assembly, the fixing frame magnet is arranged on the suspension fixing frame so as to provide suspension force for the rotating shaft through magnetic mutual exclusion, the rotor magnet and the first magnet are arranged to attract each other so as to drive the rotating shaft to rotate in a motor direct drive and non-contact mode, and the rotating shaft rotates in a suspension mode so as to greatly reduce friction force in the rotating process; and the stability of driving the film to rotate is greatly improved.

The patent application discloses a rotor for a motor. The rotor may comprise a shaft body, a shaft, a rotor magnet, and a plurality of air holes. The shaft body may have a first end, a second end, and a cylindrical body between the first end and the second end. The shaft may extend along a central axis of the shaft body. The rotor magnet on a magnetic slot inside the cylindrical body may be configured to rotate together with the shaft. The plurality of air holes on the first end of the shaft body may run through the cylindrical body and end in the second end of the shaft body.

According to the non-magnetic stator tooth high-temperature superconducting synchronous phase modifier and the determination method, a plurality of superconducting excitation windings are arranged between a rotor magnet yoke and a superconducting shielding layer along the circumferential array of the rotor magnet yoke, and each superconducting excitation winding is connected with a superconducting excitation winding cooling structure and an excitation winding structure wound by a high-temperature superconducting strip; the superconducting excitation winding cooling structure is arranged on the excitation winding to maintain the excitation winding to operate stably at the set temperature, so that active power loss and temperature rise of the excitation winding are avoided, the superconducting excitation winding has high excitation capacity, the air gap magnetic flux density of the high-temperature superconducting synchronous phase modifier is as high as 1.6 T, and the high-temperature superconducting synchronous phase modifier can be applied to the high-temperature superconducting synchronous phase modifier. Therefore, when the radial sizes are roughly the same, the axial size of the high-temperature superconducting synchronous phase modifier can be greatly reduced, and under the condition of the same power, the axial size of the high-temperature superconducting synchronous phase modifier is about one half of that of an existing synchronous phase modifier, and miniaturization of the synchronous phase modifier is facilitated.

The invention provides an air compressor main shaft assembling method which comprises the steps that a rotor main shaft and a pressing piece are machined, components are assembled, and a rotor magnet sheath is assembled, and the rotor main shaft is integrally machined and formed and does not need to be assembled. The first bearing sleeve, the rotor magnet and the second bearing sleeve respectively sleeve the rotor main shaft in a penetrating manner, so that the coaxiality requirement of the first bearing sleeve, the rotor magnet and the second bearing sleeve is met, the overall rigidity of the rotor shaft is increased, and the stability of the rotor shaft at a high rotating speed is improved. The first bearing sleeve and the second bearing sleeve are both in interference fit with the rotor main shaft, and the rotor magnet sheath is in interference fit with the rotor magnet. The interference fit assembling mode enables the assembling process to be simple, operation is convenient, the assembling requirement can be lowered, and the assembling time can be shortened. The invention further discloses the air compressor.

This propulsion system has a propulsion device and a flight control device. The propulsion device has a motor. The motor has a rotor magnet. The flight control device acquires a motor temperature (Tm) in step S103 of flight control processing. The flight control device (40) acquires a motor current (Im) in step S108. In steps S109-S113, the flight control device (40) uses drive information, such as the motor temperature (Tm) and the motor current (Im), to perform management processing for managing demagnetization of the rotor magnet. The management processing includes processing for determining whether the state of the motor is in an abnormal region, a demagnetization region, or a normal region. In the management processing, the motor current is limited according to which region the state of the motor is in.

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 invention discloses an adjustable inerter based on differential transmission and a control method. The adjustable inerter comprises a shell, an electromagnetic clutch arranged in the shell, a flywheel connected with the electromagnetic clutch, an output bevel gear connected with the flywheel, planetary bevel gears arranged on the two sides of the output bevel gear and connected with the output bevel gear in a meshed mode, an input bevel gear connected with the planetary bevel gears in a meshed mode and a lead screw connected with the input bevel gear. A rotor shell is arranged on the outer side of the input bevel gear, a rotor gear shaft is arranged between the planetary bevel gears on the two sides, the two ends of the rotor gear shaft are installed in the rotor shell, a rotor magnet is arranged on the outer side of the rotor shell, and a rotor magnet is arranged on the outer side of the rotor magnet. A stator winding is fixedly arranged in the shell corresponding to the rotor magnet; fixed lifting lugs are arranged at the upper end of the shell and the lower end of the lead screw nut; the method has the beneficial effect that different requirements of a quasi-zero stiffness inerter control strategy on the inertia force of the suspension are met.

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 invention relates to a rotor assembly (22) for an electric motor (20), comprising a rotor shaft (24) oriented along an axial direction (A), at least two rotor stacks (30) which are arranged coaxially and offset from one another along the rotor shaft (24), wherein the rotor stacks (30) are each equipped with a number of rotor magnets (32) which are arranged tangentially distributed on the outer surfaces of the rotor stacks (30), two magnet positioning rings (42) for axially and radially positively retaining the rotor magnets (32) on the rotor stacks (30), which are arranged on the opposite end faces of the outermost rotor stacks (30), and a magnet fixing sleeve (28) placed on the rotor stacks (30) for fixing the rotor magnets (32), wherein the rotor stacks (30) are in direct contact with one another, wherein the rotor stacks (30) have retaining contours (40) for tangentially retaining the exhibit rotor magnets (32),which project radially beyond the outer circumference of the respective rotor pack (30), and wherein the retaining contours (40) of a rotor pack (30) form an axial stop for the rotor magnets (32) of an adjacently arranged rotor pack (30).

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.

To maximize the magnitude of a stator winding current of a PM motor 1 for driving an electric vehicle within a range in which irreversible demagnetization does not occur in a rotor magnet 5 when a magnitude of the stator winding current is controlled, thereby enabling larger output torque to be exerted.SOLUTION: A control device for a PM motor for driving an electric vehicle includes means for estimating a temperature of a rotor magnet of a motor, storage means for storing information capable of determining an upper limit value of a stator winding current that does not cause irreversible demagnetization in the rotor magnet at various temperatures of the rotor magnet of the motor, means for determining an upper limit value of the stator winding current at the rotor magnet temperature estimated from the information stored in the storage means, and current control means for controlling the stator winding current such that the stator winding current is limited to the upper limit value of the stator winding current.SELECTED DRAWING: Figure 1

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).