45 results about "Memory motor" patented technology

The invention discloses a variable magnetic flux memory motor, which comprises a stator, armature windings and a rotor, and is characterized in that the armature windings comprise a first winding and a second winding which are different and switchable in mode; the rotor comprises a plurality of poles distributed in the circumferential direction, each pole comprises a first layer of permanent magnets and a second layer of permanent magnets, the first layer of permanent magnets are high-coercive-force permanent magnets, the second layer of permanent magnets comprise at least two second permanent magnets, all the second permanent magnets are high-coercive-force permanent magnets or all the second permanent magnets are low-coercive-force permanent magnets, and the first layer of permanent magnets and the second layer of permanent magnets are arranged in the circumferential direction. And the characteristics of the magnetic materials of the second layer of permanent magnets of two adjacent poles are opposite, a fundamental wave main magnetic field is formed through the first winding in a magnetism increasing state so as to improve the permanent magnet torque, and the second winding is switched to excite a harmonic magnetic field in a magnetism weakening state so as to maintain torque output. According to the invention, through the collaborative design of the heteropole asymmetric permanent magnet layout and the dual-mode winding, the problems that the magnetic adjustment range of the existing variable flux memory motor is limited and the torque is suddenly reduced in a weak magnetic state are solved, and the efficient operation interval is obviously widened.

The invention discloses a variable flux memory motor adopting a consequent-pole double-layer staggered permanent magnet structure. Belongs to the field of motor design and manufacturing. Each layer of permanent magnet in the variable flux memory motor adopts a high coercive force (HCF) permanent magnet and a low coercive force (LCF) permanent magnet, the HCF and the LCF in each layer of permanent magnet form a parallel magnetic circuit, and the HCF and the LCF between the two layers of permanent magnets are arranged in a staggered manner to form a series magnetic circuit, so that the double-layer U-shaped staggered permanent magnet structure can have the advantages of series connection and parallel connection of the two permanent magnets; and meanwhile, good load magnetic stabilization capability and a wide magnetic adjustment range are achieved. In addition, the consequent pole permanent magnet design can effectively reduce the magnetic circuit magnetic resistance and improve the LCF magnetizing and demagnetizing effect.

An integrated synchronous motor charger includes a battery, and a synchronous motor having a set of phase windings, with each phase winding thereof having an open-ended winding configuration, the synchronous motor being electrically connected to the battery via a bidirectional inverter on a first end of at least one phase winding from the set of phase windings, and to a power source on a second end of the at least one phase winding. The synchronous motor is operably shiftable between a charging mode and a driving mode, the synchronous motor allowing electric power to flow bidirectionally between the power source and the battery in the charging mode, and allowing electric power to flow bidirectionally between the battery and the synchronous motor in the driving mode.

The invention discloses a variable flux memory motor and a shaftless rim underwater thruster, the motor comprises a stator, an armature winding, a rotor, a plurality of low-coercivity permanent magnets and a plurality of high-coercivity permanent magnets, the armature winding adopts a twelve-phase winding, the low-coercivity permanent magnets and the high-coercivity permanent magnets are arranged in the rotor and are alternately distributed in the circumferential direction; the low-coercive-force permanent magnet is connected with the high-coercive-force permanent magnet in series in a magnetism increasing state and a magnetism weakening state, and in the magnetism increasing state, the magnetomotive force direction of the low-coercive-force permanent magnet is consistent with that of the high-coercive-force permanent magnet; and in the weak magnetic state, the reverse is achieved. By adopting the series magnetic circuit structure design of the two different coercive force permanent magnets, the load magnetic stabilization capability of the low-coercive force permanent magnets in the motor can be effectively improved, so that the magnetic field stability and the overall performance of the motor are improved.

The utility model relates to a handheld automobile seat memory motor detection device, which belongs to the field of automobile seat quality detection and comprises a shell, a hook, a circuit board, a voltage comparison module and a battery. The shell comprises an upper shell and a lower shell; the hook is hinged with the lower shell; the reel is arranged in the shell; a shaft rod of the hand wheel penetrates through the side portion of the lower shell and is fixedly connected with the winding frame. One end of the sheath wire is welded on the circuit board, and the other end of the sheath wire penetrates out of the central hole of the reel and penetrates through the lower shell; the end, outside the shell, of the sheath wire is inserted into the junction box, and the anti-skid rubber pads are fixedly pasted to the two sides of the lower shell. As the voltage comparison module powered by the battery is connected with the indicating lamp and the buzzer, compared with an oscilloscope detection device in the prior art, the size is reduced, the cost is reduced, the device is convenient to carry, detection can be carried out in a seat storeroom by holding the device by hand, the detection time is shortened, the detection range is enlarged, and the product quality consistency is effectively improved.

The invention discloses a series-parallel variable flux permanent magnet memory motor, which comprises a stator, an armature winding, a hybrid permanent magnet rotor and a non-magnetic rotating shaft, the stator comprises a plurality of stator yokes and iron core teeth arranged at the end parts of the stator yokes, armature windings are wound on the iron core teeth, the plurality of iron core teeth are encircled to form a circular hollow area, the hybrid permanent magnet rotor is arranged in the hollow area, the non-magnetic rotating shaft is arranged at the central position of the hollow area, and the hybrid permanent magnet rotor rotates around the non-magnetic rotating shaft. The problem that the size design of the permanent magnet is limited by the spatial position is effectively solved, the demagnetization resistance of the low-coercive-force permanent magnet and the flux weakening capacity of the motor are improved, multi-stage flux adjustment under different working conditions can be achieved, and the magnetic adjustment range is wider.

A power tool may include a housing. A power tool may include a motor assembly positioned within the housing, the motor assembly including: a stator with winding slots that receive stator windings, and a rotor including a first magnet positioned a first distance from a center of rotation of the rotor and a second magnet positioned a second distance from the center of the rotation of the rotor, wherein the first magnet is made of a rare earth material and the second magnet is a low-coercive-force magnet.

The present invention discloses a hybrid permanent magnet memory motor and a multi-stage magnetic modulation pulse injection method, which relate to the technical field of memory motors. The present invention comprises: a stator core, wherein the inner circumference of the stator core is provided with a plurality of stator teeth, and the armature winding is installed between two stator teeth; and a rotor core, wherein the rotor core is sleeved inside the stator core. The Y-type topology structure of the present invention includes two different magnetic circuits, a series type and a parallel type. The high coercive force permanent magnet can provide a stable magnetomotive force, and since the high coercive force permanent magnet is located outside the rotor, it can effectively resist unexpected demagnetization under load conditions; the low coercive force permanent magnet can be bidirectionally magnetized, and most of the magnetic field forms a short circuit inside the rotor when the magnetism is weak, thereby effectively improving the magnetic modulation range. Compared with the traditional d-axis magnetic modulation, the magnetic modulation method only requires a smaller pulse current to achieve the same magnetic modulation effect as the traditional structure.

The invention discloses a speed sensorless control method for a humanoid robot joint memory motor, and relates to the technical field of electric drive control equipment. Firstly, by observing the d-axis stator current component and the q-axis stator current component of the humanoid robot joint memory motor, the rotation speed, electromagnetic torque, magnetic flux, and the d-axis stator voltage component and the q-axis stator voltage component are designed, and the relationship between the current and the electrical angle of the joint motor is established. Then, according to the equivalent control principle, the observation value of the electrical angle is obtained, and the sliding surface is defined by the observation value of the electrical angle. Through the second-order generalized integral sliding mode control strategy, a controller structure is designed, and a suitable adaptive sliding mode gain coefficient is added to ensure the accuracy of the control system, so that good performance can be achieved at different rotation speeds. Finally, according to the Lyapunov theorem, stability analysis is completed to prove that the estimated electrical angle observation value enables the humanoid robot joint memory motor to run smoothly.

The present application provides a brushless hybrid permanent magnet memory motor based on three excitation sources and a control method thereof, belonging to the field of motor technology. The present application adopts the design scheme of a hybrid permanent magnet memory motor, introduces a DC excitation winding into a spoke-type permanent magnet synchronous motor, places it in a magnetic bridge fixed on the end cover, and introduces an axial additional air gap to realize a brushless structure, eliminating devices such as brushes and slip rings; arc-shaped low-coercive force permanent magnets and annular low-coercive force permanent magnets are designed, and matched with air slots distributed on the rotor core, so that the three excitation sources can be matched and combined with each other, and the motor air gap flux can be adjusted, so that the motor can achieve a wide torque range while ensuring the high efficiency and high torque density of the motor. The brushless hybrid permanent magnet memory motor based on three excitation sources provided by the present application has two modes: energy-saving mode and high-performance mode. Each operating mode includes two working states: magnetization and demagnetization, and the output voltage and speed can be adjusted over a wide range.

The present invention provides a variable flux memory motor design method based on a novel hysteresis model, comprising: step S1, obtaining a first magnetization state point of a permanent magnet in the permanent magnet hysteresis model; step S2, determining whether magnetization or demagnetization is required: if so, proceeding to step S3; if not, returning to step S1; step S3, applying a magnetization current or a demagnetization current to update the magnetic field strength; step S4, determining a second magnetization state point after the first magnetization state point is moved at the current moment and updating the first-order magnetization rise curve or the first-order magnetization fall curve for the first time; step S5, removing the magnetization current or the demagnetization current; step S6, determining a third magnetization state point after the second magnetization state point is moved at the current moment and updating the first-order magnetization rise curve or the first-order magnetization fall curve for the second time, retaining the third magnetization state point for calculating motor parameters. The present invention has the beneficial effect of accurately simulating the magnetization characteristics of aluminum nickel cobalt materials and reducing complexity.

Power tools may include a housing. Power tools may include a motor assembly located within the housing, the motor assembly including a stator and a rotor, the stator having winding slots for receiving stator windings, and the rotor including a first magnet positioned at a first distance from a rotational center of the rotor and a second magnet positioned at a second distance from the rotational center of the rotor, wherein the first magnet is made of a rare-earth material and the second magnet is a low-coercivity magnet.

The invention discloses an asymmetric multi-magnetic-circuit variable-flux memory motor with a magnetic field offset effect, which comprises a stator, an armature winding and a rotor, the rotor comprises a plurality of poles, each pole is provided with a first permanent magnet layer and a second permanent magnet layer, the first permanent magnet layer comprises a plurality of first low-coercivity permanent magnets, and the second permanent magnet layer comprises a plurality of second low-coercivity permanent magnets. The second layer of permanent magnets comprises high-coercive-force permanent magnets and second low-coercive-force permanent magnets, and the first layer of permanent magnets of each pole are located between the high-coercive-force permanent magnets and the second low-coercive-force permanent magnets of the second layer of permanent magnets of the pole; and the high-coercivity permanent magnets of the second layer of permanent magnets of each pole are adjacent to the second low-coercivity permanent magnets of the second layer of permanent magnets of the adjacent pole. Through the double-layer permanent magnet structure and the asymmetric magnetic circuit design, the problems of magnetic flux saturation and sharp output torque drop of the conventional symmetric magnetic circuit memory motor in a weak magnetic state are solved.

The invention provides an off-line magnetizing and demagnetizing device and method for a variable flux memory motor, and relates to the technical field of motor magnetizing and demagnetizing, the device comprises an upper computer, a controller and a magnetizing and demagnetizing circuit, and the magnetizing and demagnetizing circuit comprises three electromagnetic switches and a plurality of magnetizing and demagnetizing capacitors; one end of each magnetizing and demagnetizing capacitor is electrically connected with the positive end of the direct-current power supply, and the other end of each magnetizing and demagnetizing capacitor is electrically connected with the negative end of the direct-current power supply; one end of the magnetizing and demagnetizing capacitor is electrically connected with a first winding in the memory motor through the first electromagnetic switch, and the other end of the magnetizing and demagnetizing capacitor is electrically connected with a second winding and a third winding of the memory motor through the second electromagnetic switch and the third electromagnetic switch respectively; the control end of the first electromagnetic switch, the control end of the second electromagnetic switch and the control end of the third electromagnetic switch are all electrically connected with a controller, and the controller is electrically connected with an upper computer. According to the invention, the controller is used for controlling the on-off of the electromagnetic switch, and the magnetizing and demagnetizing capacitor can accurately magnetize the three-phase armature winding of the memory motor.

The invention discloses a hybrid permanent magnet memory motor which is characterized in that a rotor iron core of a hybrid permanent magnet rotor is arranged around the outside of a non-magnetic rotating shaft, a first permanent magnet, two third permanent magnets and two second permanent magnets which are magnetized tangentially are arranged below each pole of the rotor iron core, and the first permanent magnet is arranged in a manner of being vertical to an air gap side in a linear manner; the two second permanent magnets are attached to the two sides of the first permanent magnet in a splayed mode, openings of the second permanent magnets face the rotating shaft, the sides, close to the air gap, of the two third permanent magnets are arranged in an arc shape, the sides, close to the air gap, of the first permanent magnets are provided with long-direction magnetic barriers, the sides, close to the air gap, of the second permanent magnets are provided with right-angled triangular magnetic barriers, and the sides, close to the air gap, of the third permanent magnets are provided with triangular magnetic barriers. The air gap flux density of the motor can be increased, and the torque output capacity of the motor is improved; the speed regulation range of the motor is greatly widened; the risk of accidental demagnetization caused by the fact that the second permanent magnet is influenced by magnetism adjusting current is reduced, the circuit structure is quite simple in form, and rotor space crowding is avoided.

The present invention discloses an alternating-pole series magnetic circuit hybrid permanent magnet memory motor, which includes: a stator, a hybrid permanent magnet rotor, and a non-magnetic conducting shaft. The stator includes a stator yoke, stator core teeth, stator slots, and armature windings; the hybrid permanent magnet rotor includes a rotor core, V-shaped slots, straight-shaped slots, air magnetic barriers, a first permanent magnet, and a second permanent magnet. The first permanent magnet and the second permanent magnet of the present invention form a series magnetic circuit, which helps to improve the operating point of the second permanent magnet, thereby enhancing the magnetic stability effect. Moreover, the second permanent magnet is magnetized bidirectionally along the radial direction, enabling flexible adjustment of the air-gap magnetic density; an alternating-pole design is adopted, using iron core poles to replace half of the permanent magnet poles. While maintaining the torque performance of the motor, by reducing the direct-axis permanent magnet usage, the field weakening current of the motor is effectively reduced; field weakening is carried out using short-time current pulses, with almost no field weakening copper loss, and low coercivity permanent magnets can be field-weakened repeatedly online. The field weakening control is similar to traditional vector control and is easy to implement.

The present invention discloses a method for testing an AC magnetic modulation memory motor, comprising the following steps: S1, measuring the magnetization curve of the memory motor; S2, selecting n magnetization states of the memory motor according to the motor magnetization curve and actual needs, respectively denoted as MS i ; S3, according to the magnetization curve, it is preliminarily estimated that the magnetization state MS is guaranteed i The maximum d-axis demagnetization current that can be applied without demagnetization is denoted as I de _ i ; S4, get accurate demagnetization current I de_i ; S5, measure MS i MTPA trajectory under magnetization state. According to the characteristics of memory motor, the present invention provides the steps for perfecting the test of AC magnetic modulation memory motor, and provides guidance for the test of this type of motor; it can realize the measurement of memory motor magnetization curve, magnetization state selection, demagnetization characteristics under different magnetization states, and MTPA trajectory measurement, and provide support for the wide speed regulation operation of memory motor. It solves the problem of complex memory motor testing in the prior art.

The invention discloses a method for measuring the direct-axis inductance of a memory motor during magnetic adjustment. The method obtains the change of the permanent magnetic flux linkage of the memory motor during magnetic adjustment by approximating the magnetization curve, improves the traditional voltage pulse injection method, and makes it possible to calculate the direct-axis inductance value of the memory motor. The method can accurately measure the change value of the direct-axis inductance of the memory motor during magnetic adjustment, and provide data support for the establishment of a memory motor model. The method solves the problem that the direct-axis inductance parameter of the memory motor during magnetic adjustment in the prior art is difficult to measure.

A system for multi-Variable Flux Memory Motor (VFMM) configuration includes a set of VFMMs connected to one or more drivetrains, the set of VFMMs being configured to convert kinetic energy of the one or more drivetrains into electric power or vice-versa. The system includes a controller configured to selectively change a magnetization state of one or more VFMMs from the set of VFMMs based on power requirements. The system changes the magnetization state of the set of VFMMs based on an optimal magnetization configuration determined for each power requirement.

The invention discloses a doubly salient permanent magnet memory motor multi-modal optimization method based on an improved chaos firefly algorithm, and aims to solve the optimization problem that body structure parameters of a doubly salient permanent magnet memory motor are often multi-modal and nonlinear. Meanwhile, structural optimization has the problems of overlong calculation time, low calculation efficiency, more influence factors, slow convergence and the like, and the improved chaos firefly algorithm can effectively reduce the cogging torque pulsation problem of the motor. According to the improved chaos firefly algorithm, a complex doubly salient permanent magnet memory motor system can have the good global optimal solution and high-quality local solution fast solving capacity, and therefore multi-mode optimization of the doubly salient permanent magnet memory motor with cogging torque pulsation as the optimization target is achieved.

The application discloses a memory motor model predictive current control method considering mode switching and relates to the technical field of memory motor control. The application comprises the following steps: collecting information such as inverter bus voltage, memory motor rotor position, rotating speed and winding current; calculating winding current dq-axis components; calculating current q-axis current reference value and giving d-axis current reference value; judging system running state; updating current prediction model parameters according to magnetization state; applying dynamic control or steady-state control according to system running state; and obtaining inverter bridge arm switch tube control signals. The method applies corresponding control algorithms according to system running state, improves system steady-state performance and guarantees fast dynamic response speed. In addition, the problem of large parameter variation range of the memory motor under different magnetization states is considered, and the shortcomings of poor steady-state performance, unfixed switching frequency and dependence on accurate system parameters of the traditional model predictive current control are overcome.

The present invention belongs to the field of permanent magnet memory motor design and discloses a stator multi-tooth hybrid permanent magnet memory motor, comprising a stator, a rotor, an armature winding, an excitation winding, and a rotating shaft. The stator includes a stator yoke, the inner side of which is fixedly connected to stator teeth, the stator yoke between two adjacent stator teeth is inlaid with a high-coercivity permanent magnet, the stator teeth are provided with a plurality of small teeth at one end away from the stator yoke, and a low-coercivity permanent magnet is fixedly connected between the small teeth at the ends of two adjacent stator teeth; the armature winding and the excitation winding are wound around the stator. By arranging two permanent magnets in parallel in a magnetic concentrating manner and applying a pulse current simultaneously to change the state and direction of the low-coercivity permanent magnet, a wide range of adjustment of the motor's no-load air gap magnetic field is achieved; the multi-tooth stator structure can shorten the distance between adjacent stator teeth, reduce the amount of permanent magnets used, and improve the torque density and reduce torque pulsation while improving the utilization rate of the permanent magnets.

The invention discloses a magnetic field enhanced hybrid permanent magnet adjustable magnetic flux memory motor, which comprises a stator, a winding, a rotor and a rotating shaft, the stator is provided with the winding, the rotor is fixed on the rotating shaft, and the rotor is provided with low-coercivity permanent magnets, high-coercivity permanent magnets, V-shaped hybrid permanent magnet grooves and V-shaped high-coercivity permanent magnet straight grooves. And the V-shaped mixed permanent magnet grooves and the V-shaped high-coercivity permanent magnet straight grooves are alternately and uniformly arranged along the circumferential direction of the rotor iron core. According to the invention, the working point of the low-coercivity permanent magnet is improved, and the power density and the overload operation capability of the motor are improved; a loop is formed between the magnetic fluxes of the high-coercivity permanent magnets and the low-coercivity permanent magnets in the V-shaped mixed permanent magnet grooves, so that the air gap flux density can be greatly reduced, and the flux adjusting range of the motor is greatly widened; and the low-coercivity permanent magnet enters an air gap, so that the effect of improving the power density of the motor is achieved.

The application discloses a series magnetic circuit self-leakage magnetic type variable magnetic flux memory motor and relates to the technical field of motors.The application comprises a stator, a rotor and a winding, the rotor is provided with a first permanent magnet, a second permanent magnet, a third permanent magnet, a fan-shaped magnetic barrier and a magnetic bridge, the first permanent magnet and the second permanent magnet are uniformly distributed in a first layer and a second layer of rotor iron cores in a one-word type, a fan-shaped magnetic barrier is arranged between the two first permanent magnets, the third permanent magnet is uniformly distributed in the rotor iron core in a spoke shape, the fan-shaped magnetic barrier is respectively provided with a magnetic bridge between the permanent magnet and the outer edge of the rotor, and the first permanent magnet is respectively provided with the second permanent magnet and the third permanent magnet to form a series magnetic circuit.The application can break through the bottleneck problem of a narrow magnet adjustment range of a traditional series built-in variable magnetic flux memory motor, can maintain high torque density, can reduce the amplitude of a required demagnetizing current and can widen the high-efficiency operation range of the motor.

This invention discloses a magnetic field-enhanced parallel magnetic circuit variable flux memory motor, relating to the field of motor technology. The invention includes: a stator, comprising a stator core on which an armature winding is mounted; a hybrid permanent magnet rotor rotatably connected inside the stator; the hybrid permanent magnet rotor includes a rotor core on which multiple first permanent magnets are mounted, circumferentially distributed at the outer edge of the rotor core; second permanent magnets are mounted at both ends of each of the first permanent magnets, and the coercivity of the first permanent magnets is less than that of the second permanent magnets; multiple sector-shaped magnetic barriers are formed on the rotor core. This invention can significantly improve the load demagnetization resistance of low-coercivity permanent magnets, solving the problem of unstable operating point in parallel magnetic circuit variable flux memory motors, while maintaining the advantage of a wide magnetic adjustment range.

A variable flux permanent magnet memory motor disclosed by the present invention comprises a stator, an armature winding, a hybrid permanent magnet rotor and a non-magnetic conductive rotating shaft, the stator comprises iron core teeth and a stator yoke, the iron core teeth are located between the stator yoke and the hybrid permanent magnet rotor, and a rotor iron core of the hybrid permanent magnet rotor is arranged around the outside of the non-magnetic conductive rotating shaft. A first permanent magnet, a second permanent magnet and two third permanent magnets which are magnetized in the tangential direction and two fourth permanent magnets which are magnetized in the radial direction are arranged below each pole of the rotor iron core; the first permanent magnet and the second permanent magnet are connected through an arc-shaped magnetic barrier, the opening sides face the adjacent poles to form an outer series magnetic circuit, and the first permanent magnet and the second permanent magnet close to the air gap side form an inner series magnetic circuit through the air gap and the rotor core and are in series-parallel connection under the magnetism increasing working condition. According to the invention, the air gap flux density of the motor is increased, and the torque output capability of the motor is improved; the intensity and the efficiency of the magnetic field are optimized; the aluminum-nickel-cobalt permanent magnets between the adjacent poles have a magnetism gathering effect, the magnetic circuit structure is simple in form, and the space crowding of the rotor is avoided.

Systems are provided a rotor and magnets of a system of an electric machine that is a variable flux machine (VFM), such as a memory machine or memory motor (MM). The rotor of the system, comprising: a first set of magnets with higher coercivity integrated in at least a slot of the rotor to be arranged in a V-shape; and a second set of magnets with a lower coercivity, compared to the first set of magnets, the second set of magnets comprising at least a pair of magnets of different grades arranged in parallel in a radial slot of the rotor, where the first set of magnets forms a first magnetic layer and the second set of magnets forms a second magnetic layer of the rotor.

A system for shifting operation modes of Variable Flux Memory Motor (VFMM) from external inputs includes one or more VFMMs that convert electrical power to kinetic energy, the one or more VFMMs being configured to shift to any one of a plurality of operation modes, one or more man-machine interfaces that receive one or more external inputs from a user, the one or more external inputs being indicative of a target operation mode from the plurality of operation modes selected by the user, and a controller that shifts the operation mode of the one or more VFMMs to the target operation mode based on the one or more external inputs received from the one or more man-machine interfaces.

The invention discloses a magnetic flux leakage controllable hybrid permanent magnet variable flux memory motor, which comprises a stator, a winding, a rotor and a rotating shaft, the stator is provided with the winding, the rotor is fixed on the rotating shaft, and the rotor is provided with a low-coercivity permanent magnet, a high-coercivity permanent magnet, a V-shaped permanent magnet groove with an outward opening, a magnetic barrier and a magnetic bridge. The low-coercive-force permanent magnets comprise first low-coercive-force permanent magnets and second low-coercive-force permanent magnets, the high-coercive-force permanent magnets comprise first high-coercive-force permanent magnets and second high-coercive-force permanent magnets, the V-shaped permanent magnet grooves are uniformly arranged along the circumferential direction of the rotor iron core, and the second low-coercive-force permanent magnets are respectively placed on two sides of each V-shaped permanent magnet groove. The motor has more magnetic leakage branches, so that the magnetic leakage degree of the motor is higher and the air gap flux density is lower under no-load and weak magnetic working conditions; the demagnetization risk of the high-coercivity permanent magnet is reduced, the efficiency is improved, and the requirement for high speed increase is met.

A system for shifting operation modes of Variable Flux Memory Motor (VFMM) from external inputs includes one or more VFMMs that convert electrical power to kinetic energy, the one or more VFMMs being configured to shift to any one of a plurality of operation modes, one or more man-machine interfaces that receive one or more external inputs from a user, the one or more external inputs being indicative of a target operation mode from the plurality of operation modes selected by the user, and a controller that shifts the operation mode of the one or more VFMMs to the target operation mode based on the one or more external inputs received from the one or more man-machine interfaces.