515 results about "Permanent magnet rotor" patented technology

The invention discloses a method and a device for controlling magnetizing uniformity of a permanent magnet rotor, relates to the technical field of permanent magnet rotors, and aims to evaluate the risk of uniformity during magnetizing of the permanent magnet rotor in advance and provide effective early warning for magnetizing operation by analyzing temperature change data, shape data and surface defect data and constructing a magnetic field response capability coefficient. Based on monitoring of the internal magnetic domain data and the magnetic data of the permanent magnet rotor in the step S3, the magnetic field stability of the rotor can be dynamically analyzed in combination with the influence of an external magnetic field generated by a magnetizing source on magnetic domain alignment. The comprehensive magnetic performance stability index is generated by comprehensively considering the magnetic field response capability coefficient and the magnetizing state prediction model, and a scientific basis is provided for control and optimization in the subsequent magnetizing process. Intelligent control and optimization are carried out, grade scoring is carried out by setting a risk threshold value R and combining the comprehensive magnetic performance stability index, the magnetizing operation effect can be accurately evaluated, and corresponding control measures are taken under different grades.

The invention provides an axial magnetic field modulation type magnetic gear applying a T-shaped modulation ring structure, which belongs to the field of motors and comprises a high-speed permanent magnet rotor, a low-speed permanent magnet rotor and a T-shaped modulation ring. The modulation ring comprises a plurality of T-shaped magnetic modulation pole pieces and T-shaped non-magnetic composite material pole pieces which are alternately arranged and bonded in the circumferential direction. The high-speed permanent magnet rotor and the low-speed permanent magnet rotor each comprise a rotor iron core composed of a plurality of rotor yokes, and N-pole permanent magnets and S-pole permanent magnets embedded between the adjacent rotor yokes in the circumferential direction. The high-speed permanent magnet rotor and the low-speed permanent magnet rotor coaxially sleeve the modulation ring on the two sides of the modulation ring respectively, and form radial and axial air gaps with the modulation ring. Leakage flux at the inner peripheral ends of the rotor yokes of the high-speed and low-speed permanent magnet rotors can enter the T-shaped modulation rings to be linked with magnetic flux generated by the corresponding rotor permanent magnets, the leakage flux at the inner peripheral ends of the rotor yokes on the two sides is reduced, the high-speed and low-speed rotors coaxially rotate, the air gap flux density can be increased, and therefore the gear output torque and the torque density are improved; meanwhile, the modulation ring is easy to process and compact in structure.

Provided in the present invention are a hybrid excited axial brushless motor and a power generation method thereof. The hybrid excited axial brushless motor comprises a housing and a rotating shaft rotatably fixed in the housing. Seven parts, i.e. a first exciter stator, a first magnetic shunt ring rotor, a first permanent magnet rotor, an armature stator, a second permanent magnet rotor, a second magnetic shunt ring rotor and a second exciter stator are successively mounted in the housing in the axial direction, air gaps being provided between every two adjacent parts. The first permanent magnet rotor and the second permanent magnet rotor are symmetrically arranged and are both rotatably fixed to the rotating shaft; the first magnetic shunt ring rotor and the second magnetic shunt ring rotor are symmetrically arranged and are both fixedly connected to the rotating shaft; the first exciter stator and the second exciter stator are symmetrically arranged and are both fixedly connected to the housing. By means of an armature stator support, the armature stator is fixedly connected to the housing. The present invention achieves brushless hybrid excitation, and increases the power density and the power generation capacity of motors.

The invention discloses a mechanical weak magnetic speed regulation permanent magnet motor, and belongs to the technical field of permanent magnet motors, the mechanical weak magnetic speed regulation permanent magnet motor comprises a motor body, two sides of the motor body are respectively provided with an exhaust hole group and an air inlet hole group, the interior of the motor body is rotatably connected with a rotating shaft, and the inner side wall of the motor body is symmetrically provided with stator discs; the surface of the rotating shaft is slidably connected with two symmetrically-designed permanent magnet rotors through sliding rails, and a plurality of coil assemblies are annularly designed on the side, close to the permanent magnet rotors, of the stator disc. According to the invention, when the rotating speed of the motor body is increased, the internal pressure change of the sealing cavity is controlled through the rotating speed change of the rotating shaft and the centrifugal force change of the sealing piston block and the balancing weight, so that the gap between the magnet and the coil assembly is hydraulically adjusted, no extra energy is needed, and the energy-saving effect is realized; and automatic field weakening control can be carried out according to the real-time rotating speed, so that the stability and the safety of the operation of the motor body are effectively ensured.

The invention relates to the technical field of generators, in particular to a permanent magnet rotor generator for a vehicle, which comprises a motor main body, a rotating permanent magnet rotor arranged in the motor main body and a fixed winding stator annularly arranged outside the permanent magnet rotor, and the permanent magnet rotor comprises a motor shaft and a control cylinder fixedly sleeved on the motor shaft. The motor shaft and the winding stator are arranged in the control cylinder, the permanent magnet plates are evenly arranged outside the control cylinder, a reinforcing device and a lubricating mechanism are arranged between every two adjacent permanent magnet plates, the lubricating mechanism is used for supplying lubricating agents to the reinforcing devices, and the reinforcing devices are cushioned between the control cylinder and a thin cylinder annularly arranged in the winding stator. Radial vibration during rotation of the motor shaft is limited, lubrication of the reinforcing device is monitored and guaranteed through the lubricating mechanism, it is guaranteed that the winding stator and the reinforcing device which are in close contact can smoothly slide in a staggered mode, and power transmission heat dissipation of the windings is rapidly taken away by blowing air to gaps between the windings on the winding stator.

The invention relates to the technical field of energy-saving permanent magnet motors, and discloses a permanent magnet rotor system capable of guaranteeing ultra-high-speed stability, which comprises a permanent magnet rotor and a controller, and is characterized in that the controller injects current synthesized by fundamental waves and specific space harmonics into a stator winding on the basis of not depending on rotor radial position feedback, so that the permanent magnet rotor is controlled to rotate; an electromagnetic potential well with radial self-recovery force is constructed in an air gap of the motor; moreover, the controller also monitors the change rate of an internal torque instruction, foreseeably and instantaneously reinforces the potential well to resist impact, and synchronously corrects the fundamental current to eliminate parasitic torque pulsation associated with reinforcement. And the rotor stability is converted from a dynamic adjustment problem depending on external high-speed closed-loop control to an intrinsic constraint problem of motor self-guarantee, so that the risk of failure caused by signal delay at an ultra-high speed in traditional reaction type control is reduced.

Winding grooves are formed in a stator iron core in the circumferential direction, the winding grooves comprise outer-layer stator grooves on the yoke portion side and inner-layer stator grooves on the side close to a permanent magnet rotor, harmonic windings are embedded in the outer-layer stator grooves, and the harmonic windings are double-layer short-pitch windings; a fundamental wave winding is embedded in the inner-layer stator slot, and the fundamental wave winding is a centralized winding; a plurality of modulation teeth are arranged in the stator iron core along the circumferential direction in a non-equidistant manner; the number pf of pole pairs of the fundamental wave winding is consistent with the number pf of pole pairs of the permanent magnet rotor, the number ph of pole pairs of the harmonic wave winding is different from the number pf of pole pairs of the fundamental wave winding, and the number Ns of poles of the modulation teeth meets the condition that Ns = pf + ph, Ns = (1 + 2n) ph or Ns = (1 + 3n) ph. The technical defects that a traditional permanent magnet motor cannot utilize harmonic waves and a conventional magnetic gear effect permanent magnet motor cannot efficiently utilize harmonic waves and fundamental waves to do work can be overcome, the torque density of the motor is greatly improved while the power factor is not degraded, and the complexity, the system cost and the additional loss of a magnetic field modulation structure are reduced.

For interventional surgery, robot-assisted operation and image guidance are urgently required clinically. However, due to limitation of size, magnetic component interference and the like, tracking and positioning of magnetic imaging catheters in IVUS and OCT forms are difficult problems. The interventional imaging catheter, the six-degree-of-freedom positioning method, the six-degree-of-freedom positioning system, the six-degree-of-freedom positioning equipment and the medium are different from a magnetic positioning method of a transmission embedded sensor, and the interventional imaging catheter is compatible with a magnetic part in a permanent magnet rotor form. Meanwhile, in cooperation with a magnetic positioning search strategy for linearly solving an initial value, positioning of the catheter can be rapidly achieved.

The invention relates to a novel parallel pole-arc-changing hybrid excitation brushless synchronous generator, which comprises a first magnetic circuit, a second magnetic circuit and a third magnetic circuit, the first magnetic circuit is formed by an original stator permanent magnet rotor of the motor; corresponding hybrid excitation rotors are arranged on the left and right outer sides of the stator, and a second magnetic circuit is formed between the hybrid excitation rotors and the iron core of the stator; an excitation winding is further arranged on the outer side of the corresponding hybrid excitation rotor, and the excitation winding enables common teeth of the hybrid excitation rotor to be magnetized into different polarities, so that a third magnetic circuit for increasing or weakening magnetism is formed. The motor has the beneficial effects of wide rotating speed adjusting range, high power density and high efficiency.

The invention belongs to the field of rotor design, particularly relates to a high-speed built-in permanent magnet rotor design method, system and equipment based on a stress analysis model, and aims to solve the problem that the structural strength and electromagnetic performance of a high-speed built-in permanent magnet synchronous motor rotor are difficult to collaboratively optimize in the prior art. The method comprises the steps of determining the axial length and the outer diameter of a rotor according to a motor torque demand and an assembly space, and ensuring that a critical rotating speed is higher than a target limit value through dynamic verification; decomposing the rotor into pole shoe, permanent magnet and slotting areas, calculating centrifugal force in different areas, and superposing to obtain a total load; establishing a corresponding stress boundary equation set for a non-magnetic bridge, single / combined magnetic bridge or sheath composite structure; and solving the equation set based on the target rotating speed, and synchronously optimizing the sheath thickness, the magnetic bridge width and the interference magnitude parameter by using the intersection point of the isorotation speed line and the electromagnetic-mechanical characteristic curve. The problem of contradiction between size parameters and performance in traditional design is solved, and calculation efficiency and precision are both considered.

An electric machine having a shaft, a rotor with a magnetic core comprising a series of stacked laminations and a plurality of seats oriented axially, a plurality of magnetic poles, each having two permanent magnets, and a stator. The magnetic core comprises first laminations alternated with different second laminations, with at least ten second laminations interposed between two first laminations. Each first lamination has, for each seat, two first fixing blades, which are parallel to each other, and arranged on the same side of the first seat and bent by 90° against a same larger side wall of a corresponding permanent magnet, and also has, for each seat, a second fixing blade, which is oriented perpendicular to the corresponding first fixing blades and bent by 90° against a smaller side wall of a corresponding first permanent magnet. Each second lamination lacks fixing blades bent against the corresponding permanent magnet.

The utility model relates to the technical field of power generation, in particular to a power generation device for a high-pressure pipeline, which comprises a shell, the shell is provided with a water outlet and a water inlet on the side surface, and a base is arranged at one end of the shell; a Tesla turbine disc is arranged in the shell and is opposite to the water inlet; a bearing support is arranged in the shell, and the Tesla turbine disc is connected to the bearing support through a rotating shaft; a permanent magnet rotor is arranged at the end, away from the water outlet, of the rotating shaft, a stator plate is arranged on the shell or the base, a water stop plate is arranged between the stator plate and water flow in the shell, and the stator plate and the shell are arranged in an insulated mode. The device can be applied to a high-pressure pipeline to realize self power generation and has the advantage of high water pressure bearing capacity.

A liquid pump with a housing in which a wound stator and electronics are arranged in a dry area. A permanent magnet rotor is arranged in a wet area. A shaft is held on the one hand in a pump head and on the other hand in a shaft receptacle in a containment shell. The containment shell separates the dry area from the wet area. At least one bearing is incorporated in the permanent magnet rotor and is arranged rotatably on the shaft, wherein the permanent magnet rotor comprises a plastic insert and a permanent magnet, and at least one fluid channel runs parallel to the axis and is formed between the plastic insert and the permanent magnet.

The invention discloses a permanent magnet motor magnet performance degradation evaluation method, belongs to the field of permanent magnet motor tests, and is used for solving the technical problem that reversible demagnetization and irreversible demagnetization are difficult to effectively distinguish in the prior art. The method comprises the following steps: step 1, installing a selected adaptive permanent magnet rotor assembly on a motor installation seat of a test bed; 2, hardware debugging is completed; 3, test parameters are set, and a cooling module is started; 4, starting the to-be-tested permanent magnet motor according to a set rotating speed, gradually applying a load by a loading device according to a test requirement, and monitoring the running state of the motor in real time; step 5, collecting performance data of the permanent magnet motor to be tested according to a preset sampling frequency; step 6, repeating the steps 2-5 to carry out a cyclic test, wherein the cumulative operation time is greater than or equal to 100 hours; sampling is conducted after circulation, and the coercive force change rate delta Hcj and the residual magnetism change rate delta Br of the sample are measured. According to the invention, whether irreversible performance degradation of the magnet occurs can be determined.

The invention discloses a mechanical variable flux motor, and belongs to the technical field. A mechanical variable flux motor comprises a first permanent magnet rotor, a second permanent magnet rotor, an elastic shaft and a limiting mechanism. The elastic shaft is connected with the first permanent magnet rotor and the second permanent magnet rotor to stagger a preset angle; the limiting mechanism is located between the first permanent magnet rotor and the second permanent magnet rotor and limits the included angle between the two within a preset range. The torque output of the motor is adjusted by adjusting the included angle between the two rotors. In an initial state or a working condition requiring a small torque, a preset angle is kept between the two rotors, so that the motor can obtain a small torque and a high maximum rotating speed; when a working condition that the torque is greater than or equal to a rated torque is needed, the included angle between the two rotors is reduced, so that the motor obtains a larger torque, but the maximum rotating speed is correspondingly reduced. According to the motor, the mechanical variable-flux mechanical structure is simplified, the highest rotating speed is obviously higher, the reliability of the motor is improved, and the cost of the motor is reduced.

The magnetic suspension motor comprises permanent magnet rotors, a main shaft and two stator assemblies, the two permanent magnet rotors are coaxially arranged in the axial direction, the two permanent magnet rotors are fixedly connected with the main shaft respectively, the number of magnetic poles of the two permanent magnet rotors is the same, and the two stator assemblies are located on the outer sides of the two permanent magnet rotors respectively. The two stator assemblies respectively drive the two permanent magnet rotors to suspend and rotate through magnetic force. The two stator assemblies correspond to the permanent magnet rotors respectively, one or two independent magnetic circuits are formed, the total electromagnetic force borne by the permanent magnet rotors is improved, and therefore under the condition that the sizes of motors are the same, larger power is provided for the main shaft, and the flow and lift of the pump are improved.

The present invention discloses a frameless torque motor integrated with a multimodal heat dissipation structure, which includes a plurality of stator cores arranged in a ring shape, including an upper splicing plate. The upper splicing plate is a ring-shaped strip structure, and a block is fixed to the lower part of the upper splicing plate. The heat dissipation efficiency of the frameless torque motor is significantly improved through the multimodal heat dissipation structure. The first, second, and third ventilation holes correspond to each other and are interconnected to form a continuous ventilation channel, which, in cooperation with the honeycomb grille structure below the permanent magnet rotor, optimizes the airflow and increases the heat dissipation area. The high thermal conductivity graphene composite phase change material coating applied in the ventilation holes and the honeycomb grille utilizes the high thermal conductivity and phase change heat absorption characteristics of graphene to effectively manage high temperatures and reduce the temperature rise of the motor. In the scenarios of high load and long-term operation of industrial robots, this design can prevent heat accumulation, extend the service life of the motor, improve the operation stability, meet the high power density requirements, and ensure the continuous and efficient performance of robot joint drives.

The novel magnetic suspension bearingless motor comprises permanent magnet rotors, a main shaft and a stator assembly, the two permanent magnet rotors are coaxially arranged along the axial direction, the two permanent magnet rotors are respectively and fixedly connected with the main shaft, the number of magnetic poles of the two permanent magnet rotors is the same, and the arrangement directions of the magnetic poles are the same. The two stator assemblies are located on the outer sides of the two permanent magnet rotors respectively, and the two stator assemblies drive the two permanent magnet rotors to suspend and rotate through magnetic force respectively. The two stator assemblies correspond to the permanent magnet rotors respectively, two independent magnetic circuits are formed, the total electromagnetic force borne by the permanent magnet rotors is improved, and therefore under the condition that the sizes of motors are the same, larger power is provided for a main shaft, and the flow and lift of a pump are improved.

The invention discloses a built-in permanent magnet motor for a new energy automobile. The built-in permanent magnet motor comprises a main fixing plate, a shell, a main fixing support, a stator, a main shaft, a permanent magnet rotor, cooling fins, a heat conduction pipe, a side fixing support, a damper spring, a side fixing plate, cooling fins, a base, a fan, a rear end cover, fan blades, a protection cover, cooling holes, a front end cover, a junction box and a bearing. Heat conduction pipes are fixedly connected to the heat dissipation fins, side fixing supports are fixedly connected to the outer walls of the two sides of the shell, heat dissipation fins are fixedly connected to the side fixing supports, and the heat conduction pipes are fixedly connected to the heat dissipation fins; the anti-vibration structure is designed, and the damping units are arranged on the two sides of the motor, so that vibration acting on the motor in the horizontal direction in the vehicle running process is effectively resisted, the operation stability of the motor is greatly improved through the improvement, the service life of the motor is remarkably prolonged, and the service life of the motor is prolonged. And the stability performance of the vehicle in a complex and changeable driving environment is ensured.

A method of adjusting motor control voltages for a permanent magnet rotor motor comprising three phase coils, each phase coil having two free ends, the three phase coils being without a common node. The method comprises driving the motor by applying motor control voltages in turn to respective pairs of the three phase coils with a remaining one of the three phase coils not being driven. Then, determining for each of the pairs of the three phase coils respective values of a motor operating parameter. The values of the motor operating parameter are compared and, based on said comparison, three-phase stationary reference frame motor control voltages va, vb, vc generated for driving the coils in a field-oriented control (FOC) mode of operation are adjusted to provide adjusted three-phase stationary reference frame motor control voltages v′a, v′b, v′c for driving the coils in the FOC mode of operation.

The utility model relates to the technical field of rotary kilns, and discloses a rotary kiln capable of automatically regulating and controlling wind. The rotary kiln capable of being automatically regulated and controlled through wind comprises a bottom plate, a bracket is fixedly installed above the bottom plate, a supporting roller is installed above the bracket in a penetrating and inserting mode, a supporting ring is installed above the supporting roller in an embedded mode, a kiln body is fixedly installed at the center of the supporting ring, and a gear ring is fixedly installed on the outer side of the kiln body; a driving motor is fixedly mounted above the bottom plate, an electromagnetic stator is fixedly connected with a shell, a main shaft is rotationally connected with the shell through a limiting bearing, a permanent magnet rotor is located in the center of the electromagnetic stator, the permanent magnet rotor and the electromagnetic stator are of a concentric circle structure, and a partition plate is rotationally connected with the main shaft through a connecting bearing; the electromagnetic stator can drive the permanent magnet rotor to drive the main shaft to rotate after being electrified, in this way, the magnetic force of the electromagnetic stator can be adjusted through voltage, and therefore the rotating speed of the permanent magnet rotor is adjusted, and the air inlet amount is adjusted.

The invention relates to a permanent-magnet rotor (1) for an electric machine (2), comprising a rotor body (3) having a plurality of magnet pockets (4) for receiving permanent magnets (5) which are configured to form alternating magnetically opposed rotor poles (6) distributed over the circumference of the rotor body (3), wherein circumferentially adjacent magnet pockets (4) of a rotor pole (6) are each separated from one another by a radially extending bridge (7), wherein an opening (8) in the form of a circular ring segment is formed in the rotor body (3) so as to be radially aligned with and radially outwardly spaced from at least one bridge (7).

A permanent magnet rotor assembly for an electric motor, an electric vehicle, and a method are provided. The assembly includes an annular stack of rotor lamination layers ("rotor laminations") constructed from a magnetic core material. The rotor laminations have inboard axial surfaces that collectively define a set of first openings through the magnetic core material and a set of second openings through the magnetic core material. The annular stack includes a first arrangement of permanent magnets and a second arrangement of permanent magnets.

The present disclosure relates to an electromechanical apparatus (100) and to a transmission unit comprising the electro-mechanical apparatus (100) for changing motion parameters and to a vehicle comprising the transmission unit, the electro-mechanical apparatus (100) comprising a first rotating electromechanical ma-chine (110) comprising a first stator (112) and a first rotor (120), a second rotating electromechanical machine (130) having a smaller radial extension than the first rotating electromechanical machine (110) and comprising a second stator (132) and a second rotor (140), wherein the second rotating electromechanical ma-chine (130) is arranged radially within the first rotating electromechanical ma-chine (110) thereby forming an interleaving region (176) of the electromechanical apparatus (100), and wherein the first stator (112) and the second stator (132) are ironless, and wherein the first rotor (120) and the second rotor (140) are per-manent-magnet rotors or rotors comprising a winding for electrical excitation.

The invention discloses a high-inertia multi-port composite motor for new energy grid connection. The high-inertia multi-port composite motor comprises a brushless doubly-fed motor, an axial permanent magnet motor and a magnetic gear structure. The brushless doubly-fed motor comprises a radial stator and a squirrel cage rotor, a power winding and a control winding are arranged in the stator and serve as a first electric port and a second electric port respectively, the axial permanent magnet motor comprises an axial stator and an axial permanent magnet rotor, and an armature winding is arranged in the stator and serves as a third electric port. The magnetic gear structure is arranged on the inner side of the squirrel cage rotor and the outer side of the rotating shaft, a brushless doubly-fed motor rotor magnetic field is used as a modulation magnetic source, the phase and amplitude of the magnetic field are adjustable, dynamic adjustment of the transmission ratio of the magnetic gear is achieved through a control winding, and electromagnetic and mechanical dual coupling is achieved. The equivalent rotational inertia of the composite motor is obviously higher than that of a single machine, stronger inertia support and frequency stability can be provided for a power grid in a new energy grid connection process, and the composite motor is provided with three independent electric ports, realizes multi-mode operation, and is compact in structure and high in power density.

The utility model relates to the technical field of motor cooling, and provides a special-shaped heat pipe for improving heat dissipation of a permanent magnet rotor and a permanent magnet motor. The section of the peripheral wall of the special-shaped heat pipe comprises a first arc line segment, a second arc line segment, a third arc line segment and a fourth arc line segment which are sequentially connected end to end, the circle center of the first arc line segment and the circle center of the third arc line segment are located on the same straight line, and the radius of the first arc line segment is smaller than that of the third arc line segment. The two ends of the second arc line segment are tangent to the first end of the first arc line segment and the first end of the third arc line segment respectively, the two ends of the fourth arc line segment are tangent to the second end of the first arc line segment and the second end of the third arc line segment respectively, and the circle centers of the first arc line segment and the third arc line segment are located on the inner side of the special-shaped heat pipe. The circle centers of the second arc line segment and the fourth arc line segment are located on the outer side of the special-shaped heat pipe, the contact area between the special-shaped heat pipe and a heat source is increased, the cooling effect is improved, and the heat exchange efficiency is effectively improved.

The invention provides a hybrid excitation magnetic circuit structure, a motor with the structure and a control method of the motor. According to the hybrid excitation magnetic circuit structure, basic magnetic flux is provided through a permanent magnet rotor assembly, the magnetic flux is dynamically adjusted through an electro-magnetic winding assembly, and superposition enhancement or partial counteracting of a main air gap magnetic field can be achieved only by switching the direction of electro-magnetic current; the output torque of the motor is obviously enhanced; and second-direction current is conducted in a constant power area to counteract part of magnetic flux and expand the speed regulation range of the motor, so that various working condition requirements can be met, and wide-range efficient operation is realized.

The utility model relates to the technical field of motors, in particular to a permanent magnet rotor with internal and external double poles. According to the permanent magnet rotor with the inner and outer pole numbers, the size of the rotor is reduced, the outer magnetic steel and the inner magnetic steel are concentrically arranged in the radial direction, and compared with two sets of permanent magnet rotors with different pole numbers, the integrated size is smaller; the rotor only has magnetic steel and does not contain a winding, so that heat of the winding is prevented from being conducted to the magnetic steel, and heat dissipation is improved; the magnetic steel is separated from the winding, and the production efficiency is improved.

The application relates to the technical field of rotor detection, and discloses a motor rotor core permanent magnet detection method, which is characterized by comprising the following steps: S1, fixing a magnetic field detection device at a tangent point position of the permanent magnet rotor; placing a detection probe of the magnetic field detection device at a certain position away from the rotor, the magnetic field detection device needs to be aligned with the diameter of the rotor, and the spacing between the detection probe and the rotor can ensure that the magnetic tiles placed later will not contact the detection probe; S2, a speed detection motor detects the rotating speed and rotating position of the rotor while the motor drives the rotor to rotate. The application compares multiple'magnetic field strength-mechanical angle' models, and compares the magnetic field strengths under the four mechanical angles of 0-90 DEG, 90-180 DEG, 180-270 DEG and 270-360 DEG in the same coordinate system, so that whether the four main tiles on the rotor appear the phenomenon of magnetic field deficiency can be intuitively analyzed.

The invention belongs to the technical field of submersible pumps, and provides a medium-high-lift full-cross-flow submersible mixed-flow electric pump which comprises a water suction chamber, an impeller and a water outlet cylinder which are coaxially connected in sequence, a rotating shaft is arranged in the center of the impeller, the two ends of the rotating shaft are in rotatable supporting connection with the water suction chamber and the water outlet cylinder respectively, and a motor shell is arranged on the outer side of the impeller. The two ends of the motor shell are fixedly connected with the water suction chamber and the water outlet cylinder respectively, a wet stator is fixed to the inner side of the motor shell, a permanent magnet rotor is fixed to the outer side of the impeller, the wet stator drives the permanent magnet rotor to drive the impeller to rotate, and a fixing sleeve for fixing the permanent magnet rotor is arranged on the outer side of the impeller. And gaps are formed between the end parts of the two sides of the fixing sleeve and the water suction chamber and between the end parts of the two sides of the fixing sleeve and the water drum and are tooth-shaped. And through the arrangement of the tooth-shaped gaps, the path length of the gaps is prolonged, and a vertically staggered blocking structure is also formed, so that particulate matters in a water body can be prevented from entering the motor cavity.