61 results about "Permanent magnet direct current" patented technology

The invention relates to the technical field of motor control, and discloses a control method and system of a permanent magnet direct current brushless slotless motor. The method comprises the following steps: performing temperature compensation and signal filtering on voltage data of a Hall sensor to obtain rotor position information and temperature characteristic data; performing magnetic field intensity dynamic compensation calculation according to the rotor position and the temperature data to obtain magnetic field intensity parameters; adjusting the amplitude and phase of the three-phase current according to the magnetic field intensity parameter, and generating a current control quantity; extracting and compensating a harmonic component to obtain a torque smooth control instruction; all losses are calculated and optimized, and efficiency optimization parameters are generated; and performing feature extraction and anomaly judgment on the operation parameters, and outputting a protection control strategy. Accurate detection of motor position signals, stable control of torque, optimal control of loss and real-time monitoring and protection of abnormal states are achieved under the high-temperature working condition, and therefore stable operation and the service life of the motor under the high-temperature environment are guaranteed.

The invention relates to the technical field of motor performance evaluation, in particular to a permanent magnet direct current pump motor performance evaluation method and system based on cloud computing. Comprising the steps of obtaining current waveform data and vibration waveform data, and obtaining a first criterion based on the current waveform data and the vibration waveform data; obtaining a second criterion according to the vibration waveform data; obtaining a third criterion according to the vibration waveform data; obtaining a fourth criterion according to the current waveform data and the vibration waveform data; judging the causal correspondence between the current step and the output change of the control loop to obtain a fifth criterion; continuously observing the change trend of high-frequency components in the vibration waveform data to obtain a sixth criterion; based on the first criterion, the second criterion, the third criterion, the fourth criterion, the fifth criterion and the sixth criterion, obtaining a classification result; and confirming measures according to a classification result. The problems of repeated false alarm, invalid maintenance and system reliability evaluation deviation caused by the fact that a permanent magnet direct current pump motor performance evaluation system cannot distinguish real mechanical faults under a low-speed cruise working condition in the prior art are solved.

The utility model relates to a novel outer rotor permanent magnet direct current brushless motor, which belongs to the technical field of permanent magnet direct current brushless, and comprises an outer rotor, a stator, a flange plate, a motor shaft and an upper cover, the motor shaft is die-cast on the center of the flange plate, and the motor shaft penetrates through the stator to be connected with the flange plate. The provided power rotating speed range is wide, compared with other brushless motor structures, the flange plate of the brushless motor is simple in structure, comprehensive in function, easy in manufacturing process implementation, waterproof and breathable, and capable of obviously reducing high temperature generated by operation of a controller and reducing internal air pressure. And as the flange plate is provided with the outer ring exhaust heat dissipation ribs, high-temperature heat generated in the operation process of the brushless motor can be effectively and timely discharged, the effects of ventilation, exhaust and heat dissipation are achieved, and the normal working effect of the motor is protected.

Technical solutions for diagnosing a sensor fault in an actuator incorporating a permanent magnet direct current (PMDC) motor are described, including: measuring, by means of a position sensor, the position of the PMDC motor; determining, based on the measured position, an estimated motor speed; measuring, by means of a current sensor, the current in the PMDC motor; determining, based on the measured current in the PMDC motor, a voltage command for the PMDC motor; determining, based on the measured current and the voltage command and using a motor speed observer, an observed speed of the PMDC motor; determining a differential speed as the difference between the estimated motor speed and the observed speed; determining, based on the differential speed, the sensor fault; and performing an action in response to the determination of the sensor fault.

The invention discloses an energy-saving operation control method and system for a permanent magnet direct current pump motor, and relates to the technical field of motor control, and the method comprises the steps: collecting a first drive current signal and a back electromotive force signal of the permanent magnet direct current pump motor; if a periodic peak and an electrical angle concentration phenomenon exist in the first driving current signal, performing quality evaluation on the back electromotive force signal to obtain back electromotive force credibility; if the back electromotive force credibility is greater than a preset credibility threshold value, applying operation parameter disturbance to the permanent magnet direct current pump motor; acquiring a second driving current signal of the permanent magnet direct current pump motor; performing disturbance response feature extraction on the permanent magnet direct current pump motor to obtain disturbance response features; identifying a disturbance source; and adjusting the operation strategy of the permanent magnet direct current pump motor to control the motor to operate. According to the method, the disturbance source can be recognized by combining the operation parameter disturbance and the disturbance response characteristics, the operation strategy is adjusted, motor operation control is achieved, and accuracy and reliability are improved.

The invention relates to the technical field of welding processes, in particular to cooler runner pipeline welding equipment which comprises runner pipe guide mechanisms and grinding mechanisms which are symmetrically distributed, and a rotary supporting motor is arranged in a rotary supporting arm; the grinding mechanism comprises a permanent magnet direct current motor and a grinding supporting arm, and a grinding head is arranged on the grinding supporting arm. The welding supporting frame is connected with a welding gun through a welding gun supporting rod, and the welding gun is used for welding the polished runner pipe. The grinding heads are connected to the output shafts of the double-output-shaft motor, the grinding heads with different diameters can be selected according to needs to grind flow channel pipe ports with different sizes at the same time, impurities and defects on the surface of a weld joint can be removed, the flow channel pipes are close to one another through the flow channel pipe guide mechanism, and the grinding efficiency is improved. After the rotary supporting motor is started, the runner pipe is driven to rotate, meanwhile, the technological processes of polishing, welding and the like are conducted on the runner pipe, the welding efficiency is improved, and the welding quality can be guaranteed.

The utility model relates to pitching equipment, in particular to an electric antenna pitching device, which is characterized in that a shell plays an important role in supporting and fixing shafting parts; the permanent magnet direct current gear motor provides an electric transmission power source; the gear pair realizes a transmission reduction ratio; the positioning device is responsible for positioning the communication antenna; the clutch device is responsible for cutting off and combining a power system and a transmission system; the locking device is responsible for rotating the antenna and is arranged on the front panel; the manual shaft, the small gear and the middle gear are responsible for the manual function. The beneficial effects of the utility model are that the communication antenna can fluctuate at will, the communication is kept normal, the positioning precision is high, the use efficiency is high, the control is humanized, the structure is simple, the size is small, the weight is light, the transmission efficiency is high, the operation is economical, the transmission power and speed range is large, the maintainability is strong, the production cost is low, the installation is easy, and the operation is time-saving and labor-saving.

The utility model relates to lodging equipment, in particular to an electric antenna lodging device, which is characterized in that a shell plays a role in supporting and fixing shafting parts; the permanent magnet direct current gear motor is used for providing an electric transmission power source; the gear pair realizes a transmission reduction ratio; the positioning device is responsible for positioning the communication antenna; the clutch device is used for cutting off and combining a power system and a transmission system; the dividing device is responsible for the on-off effect of the electromagnet; and the locking device is used for fastening the communication antenna on the output shaft, is responsible for the rotation of the antenna and is arranged on the front panel. The utility model has the characteristics of high positioning accuracy, high use efficiency, humanized control, simple structure, small volume, light weight, high transmission efficiency, economical operation, large transmission power and speed range, strong maintainability and low production cost.

The present invention provides a waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake, comprising a first sealing structure installed on the rear side of the permanent magnet DC motor, the first sealing structure being used to seal a carbon brush replacement window on the permanent magnet DC motor; the first sealing structure comprising a sealing ring and a friction pad, the friction pad being fixedly connected to a rear axle seat on the rear side of the permanent magnet DC motor, and the sealing ring being slidably installed on the rear axle seat; a first sealing component being installed on a joint surface between the sealing ring and the rear axle seat, and a second sealing component matching the first sealing component being installed on a joint surface between the sealing ring and the friction pad; the waterproof sealing structure of a permanent magnet DC motor with an electromagnetic brake provided by the present invention overcomes the defect that the protection level of existing permanent magnet DC motors and their normally closed electromagnetic brakes is too low.

The application discloses an oil-electric hybrid unmanned aerial vehicle power system and relates to the technical field of unmanned aerial vehicles and aircrafts. The application is characterized by the coaxial direct-drive direct-connection cooperation design of the propeller, the engine and the direct-current permanent magnet motor, simple structure, reliability, durability and high power-to-weight ratio. The oil-electric hybrid system is formed by the cooperation of the oil engine and the permanent magnet direct-current motor. The permanent magnet direct-current motor can start the engine and convert the excess power into electric energy to charge the storage battery. The torque of the engine can be changed by the direct-current bidirectional electric governor, so the speed of the propeller can be accurately controlled, and a three-in-one machine is formed. Different displacement engines can be matched with corresponding power direct-current permanent magnet motors. Different power ratios can be used for different models of unmanned aerial vehicles and multi-rotor aircrafts. Different accurate control and speed regulation ratios can be combined by the cooperation of different power engines and direct-current permanent magnet motors.

The invention discloses a multi-section permanent magnet direct current motor, which relates to the technical field of rotary motors and comprises a stator, a rotor and a casing, the stator is formed by connecting a plurality of stator units in series, and the rotor is formed by connecting a plurality of rotor units in series. The stator unit is composed of a stator iron core and an excitation coil, and the stator iron core is provided with a magnetic pole shoe and an inner hole. The exciting coil is wound outside the stator magnetic pole shoe; and a rotor is coaxially arranged in an inner hole of the stator unit. The rotor unit is composed of a rotor core, a permanent magnet pole N pole and a permanent magnet pole S pole. The rotor core is provided with a center hole. The motor is formed by connecting a plurality of sections in series, is high in power density and torque, steplessly and smoothly regulates the speed, can stably run at a low speed, can realize a low-speed and high-torque direct drive system, and has the advantages of high efficiency, high power factor, simple structure, good manufacturability, low vibration and noise and the like.

The invention relates to the technical field of permanent-magnet direct-current brushless slotless motors, in particular to a high-temperature-resistant direct-current coreless permanent-magnet direct-current brushless slotless motor, which comprises a front cover assembly connected with a stator and a rotor and used for protecting the high-temperature direct-current coreless permanent-magnet direct-current brushless slotless motor; the stator is connected with the front cover assembly, the rear cover assembly, the rotor and the Hall plate assembly, and is used for generating a rotating magnetic field and driving the rotor to rotate; the rotor is connected with the front cover assembly, the stator, the Hall plate assembly and the rear cover assembly one by one and used for converting electric energy into mechanical energy and outputting the mechanical energy; the Hall plate assembly is connected with the stator and the rear cover assembly and is used for detecting the position of the rotor and providing a control signal for the motor controller; and the rear cover assembly is connected with the stator and the rotor and is used for protecting the high-temperature direct-current coreless permanent magnet direct-current brushless slotless motor. The adaptive temperature of the permanent magnet direct current brushless slotless motor to the working environment is improved.

The utility model provides a large torque permanent magnet direct current motor, which comprises a motor shell, a rear cover, a first bearing, a second bearing, a rotating shaft, a rotor core, an arc-shaped magnet, a heat dissipation assembly, a commutator and a carbon brush assembly, and is characterized in that the heat dissipation assembly comprises a front fixing ring, a rear fixing ring and heat dissipation blades which are integrally arranged, and the periphery of the motor shell is provided with a plurality of groups of first heat dissipation holes; the heat dissipation assembly is provided with a first heat dissipation hole corresponding to the heat dissipation blades, the middle part of the heat dissipation assembly is provided with an installation cavity, the commutator is fixed on the rotating shaft, the front end of the commutator corresponds to the interior of the installation cavity, and the carbon brush assembly is fixed at the rear end of the motor shell and corresponds to the front side of the rear cover. According to the motor, the mounting distance between the commutator and the rotor core can be shortened, the structure of the motor is more compact, the size of the motor is further reduced, on the other hand, the heat dissipation assembly can quickly discharge heat from the first heat dissipation holes, the heat dissipation capability of the motor is improved, and the service life of the motor is further prolonged.

Technical solutions are described for diagnosing a sensor error in an actuator having a permanent magnet DC (PMDC) motor, including: measuring, by a position sensor, a measured position of the PMDC motor; determining, based on the measured position, an estimated motor velocity; measuring, by a current sensor, a measured current in the PMDC motor; determining, based on the measured current in the PMDC motor, a voltage command for the PMDC motor; determining, based on the measured current and the voltage command, and using a motor velocity observer, an observed velocity of the PMDC motor; determining a difference velocity as a difference between the estimated motor velocity and the observed velocity; determining, based on the difference velocity, the sensor error; and performing an action in response to determining the sensor error.

The invention discloses a permanent-magnet direct-current linear oscillation generator with a segmented stator and a segmented winding structure. The permanent-magnet direct-current linear oscillation generator comprises a stator and a rotor, the stator adopts a sectional structure and is formed by arranging m sections of stator units with the same structure along the axial direction; each stator unit comprises an inner stator, an outer stator and a coil winding; the outer stator is of a hollow circular ring structure; the inner stator comprises a first hollow circular ring and k stator teeth uniformly distributed outwards in the radial direction of the first hollow circular ring; the coil winding adopts a sectional structure, is wound on the stator teeth respectively, and is connected in series to form a single-phase winding; the rotor comprises a rotor framework and a permanent magnet; the permanent magnets are embedded in the rotor framework and are in one-to-one correspondence with the stator teeth; h groups of permanent magnets are uniformly distributed along the axial direction; and the magnetizing directions of the adjacent permanent magnets are opposite. The linear generator can be used for free piston power generation, oscillation power generation and other high-speed reciprocating linear power generation occasions, and has the advantages of being small in loss, high in power generation efficiency, low in manufacturing difficulty and the like.

The invention relates to the technical field of permanent-magnet direct-current brushless slotless motors, in particular to a permanent-magnet direct-current motor resistant to high overload and high in magnetism, which comprises a front cover assembly used for buffering and damping, heat dissipation and cooling and magnetic shielding; the stator assembly is connected with the front cover assembly, the rotor assembly and the sensor assembly and used for providing a magnetic field, driving the rotor assembly to rotate, dissipating heat generated by the motor and meanwhile providing mechanical support; the rotor assembly is connected with the front cover assembly, the stator assembly, the sensor assembly and the rear cover assembly, and is used for interacting with a magnetic field generated by the winding, driving the motor to rotate, bearing mechanical stress, controlling temperature and resisting magnetic interference; the sensor assembly is used for detecting the position and the magnetic field of the rotor assembly and converting the position and the magnetic field of the rotor assembly into electric signals; and the rear cover assembly is used for providing mechanical support for the motor and protecting internal parts of the motor. The permanent magnet direct current brushless slotless motor improves the capability of resisting high overload and high magnetism.

The utility model relates to the technical field of motor manufacturing, and discloses a permanent magnet direct current motor casing for an engineering vehicle, which comprises an outer casing, an inner casing is arranged on the inner wall of the outer casing, and four groups of magnetic pole blocks are arranged on the inner wall of the inner casing. According to the permanent magnet direct current motor shell for the engineering vehicle, the outer shell, the inner shell, the first stepped groove, the second stepped groove and the mounting bolts are matched for use, so that the outer shell is formed by welding after a thin-wall steel plate is rolled into a cylinder, the inner shell is formed by punching a steel plate roll, and the first stepped groove and the second stepped groove are formed in the outer shell and the inner shell respectively; the mounting bolts fix the outer shell, the inner shell and the magnetic pole blocks together through the first stepped grooves and the second stepped grooves, so that compared with a traditional seamless steel tube shell, the permanent magnet direct current motor shell is lower in machining and manufacturing cost and lower in raw material cost, and the manufacturing cost of the permanent magnet direct current motor shell is further reduced.

The utility model discloses a permanent magnet direct current motor carbon brush with a reinforced structure, which comprises a mounting ring disc, two ends of the mounting ring disc are fixedly connected with side plates, one sides, deviating from each other, of the two side plates are fixedly connected with two connecting square plates, and two sides of the top of the mounting ring disc are fixedly provided with carbon brush mounting plates. The tops of the two carbon brush installation plates are fixedly connected with carbon brush fixing frames, the corresponding sides in the two carbon brush fixing frames are connected with carbon brushes in a clamped mode, and the sides, away from each other, of the two carbon brushes are fixedly connected with pressure springs. The novel permanent magnet direct current motor carbon brush is provided with the installation ring disc and the carbon brush fixing frame, the carbon brush is reinforced through the carbon brush fixing frame, the installation ring disc is used for connecting equipment, the carbon brush is stabilized, meanwhile, the side edge plate is used for fixing the structure, the carbon brush is installed and detached, and the carbon brush is prevented from being damaged after being directly detached.

The utility model relates to the technical field of barbecue machine parts, and discloses a barbecue machine gear box permanent magnet direct current motor structure which comprises a gear box body, a mounting spigot is arranged on the right side face of the gear box body, an oil bearing is arranged in the gear box body, a gear transmission part is arranged in the gear box body, and a permanent magnet direct current motor is arranged in the gear transmission part. A fixing support is arranged on the right side of the gear transmission part, and a gearbox cover is arranged on the right side of the fixing support. According to the permanent magnet direct current motor structure of the gear box of the barbecue machine, the gear box body is integrally formed through aluminum casting, the structural strength of the gear box body is improved, then the gear box cover is formed through metal plate stamping, the machining cost of the gear box cover is effectively reduced, and finally the fixing support is formed through injection molding, so that the machining efficiency is improved. The fixing support is high in structural strength and good in stability, axial movement of a gear transmission component can be effectively prevented, and the overall practicability of the device is effectively improved.

The utility model provides a claw pole type permanent magnet direct current motor ceiling fan lamp which comprises a ceiling fan assembly and a lamp assembly which are arranged from top to bottom, the ceiling fan assembly comprises a claw pole type permanent magnet direct current motor and a plurality of fan blades, the claw pole type permanent magnet direct current motor comprises a motor shaft, a stator assembly and a rotor assembly, and the stator assembly comprises a stator coil and a stator claw pole. The rotor assembly comprises a rotor support and permanent magnets, the rotor support comprises a rotor cylinder and a rotor ring formed by outwards extending from the outer circumferential wall of the rotor cylinder in the radial direction, the permanent magnets are assembled on the inner circumferential wall of the rotor cylinder, the rotor ring is arranged perpendicular to the motor shaft, and the rotor ring comprises a plurality of installation areas which are evenly distributed in the circumferential direction; each fan blade comprises a fan blade body and a mounting lug arranged at one end of the fan blade body, and the mounting lugs and the mounting area are detachably assembled in the radial direction. The claw pole type permanent magnet direct current motor is used as a power source of the ceiling fan lamp, the ceiling fan lamp has the advantages of being efficient, low in noise, high in stability and the like, and a user can quickly detach the fan blades.

The invention provides a three-degree-of-freedom spherical joint motor module of an integrated speed reducer, which belongs to the field of motors, and comprises a sphere, two groups of outer rotor permanent magnet direct current brushless motor modules of integrated single-stage speed reducers, a group of third axial magnetic flux permanent magnet direct current brushless motor modules for driving to rotate around an X / Y axis, and a group of third axial magnetic flux permanent magnet direct current brushless motor modules of integrated two-stage planetary speed reducers, the outer rotor permanent magnet direct current brushless motor modules of the two sets of integrated single-stage speed reducers integrally rotate around the Z axis, and the two sets of outer rotor permanent magnet direct current brushless motor modules are located on the outer surface of the ball body and are arranged in a 90-degree space mode. According to the ball joint motor, the two sets of outer rotor permanent magnet direct current brushless motor modules rotate around respective rotating shafts within a certain angle range, the movement range of the ball is remarkably expanded, the torque output capacity of the ball is improved, and the ball joint motor has the advantages of being compact in structure, high in space utilization rate and the like.

The application discloses a low-noise permanent magnet DC motor, which solves the technical problem of large noise of a permanent magnet DC motor in the prior art during operation, and comprises a shell and a rotating shaft extending out of the shell, a commutator fixed on the rotating shaft is arranged in the shell, and a carbon brush in contact with the commutator to transmit current is arranged in the shell, the inner side surface of the carbon brush comprises an axial arc surface and a connecting inclined surface connected in an axial direction, one end of the connecting inclined surface is connected with the axial arc surface, the other end of the connecting inclined surface is inclined to the outside of the shell and connected with the end surface of the carbon brush, and the axial arc surface is in surface-to-surface contact with the outer peripheral surface of the commutator.

The invention relates to a stable and reliable food processor which comprises a permanent magnet direct current brushless motor, the motor comprises a stator and a rotor, the rotor comprises a rotor iron core and a permanent magnet, the inner side of the outer edge of the rotor iron core is provided with an installation groove for the permanent magnet to be inserted, and the position, opposite to the permanent magnet, of the outer edge of the rotor iron core is provided with a rotor salient pole protruding outwards. A groove is formed between every two adjacent rotor salient poles, the rotor further comprises a fixing cage which is arranged outside the rotor iron core and integrally formed, the fixing cage comprises end plates located at the two ends of the rotor iron core and fixing columns located on the outer side wall of the rotor iron core and connected with the end plates at the two ends, the fixing columns are located at the grooves, and the outer diameter of the fixing columns is not larger than that of the rotor salient poles. The fixing cage is provided with the fixing columns at the grooves to integrally wrap the rotor, the strength of the fixing cage is increased, the rotor iron core and the permanent magnets are fixed and limited, and the situation that the strength of the fixing cage is affected due to the fact that the periphery bears large centrifugal force when the fixing cage is fixedly connected only through the connecting column in the center and deforms is avoided.

The permanent magnet direct current motor provided by the utility model comprises a permanent magnet assembly and a winding assembly, the winding assembly comprises a coil winding and a winding support frame used for supporting and winding the coil winding, the winding support frame is provided with a mounting groove, and a semiconductor refrigeration module is arranged in the mounting groove. The refrigeration end of the semiconductor refrigeration module is adjacent to the side where the coil winding is located, the high-temperature end of the semiconductor refrigeration module faces the outer edge of the winding assembly, the semiconductor refrigeration module is electrically connected with a power supply module of the motor, an installation groove is formed in the winding supporting frame for supporting the coil winding, and the semiconductor refrigeration module is arranged in the installation groove. By utilizing the characteristics of low energy consumption and high effect of semiconductor refrigeration, a local low-temperature area is generated at a coil winding position where heat is most easily generated in the motor, so that a great deal of heat is absorbed to generate an obvious cooling effect on the coil winding position, and the high-temperature end of the semiconductor refrigeration module correspondingly faces the outer edge of the winding assembly. Therefore, heat can be discharged as soon as possible through other physical heat dissipation modes.

The invention relates to the technical field of permanent magnet linear motor control, and provides a permanent magnet linear motor thrust ripple suppression method, which comprises the following steps: analyzing target sub-harmonic current by using a harmonic analysis module according to motor operation information, extracting a zero crossing point flag bit corresponding to the target subharmonic current, a quadrature-direct axis current in a synchronous rotating coordinate system and an average current in a half harmonic period; based on the zero crossing point flag bit of the target harmonic current, the quadrature-direct axis current under the synchronous rotating coordinate system and the average current in the half harmonic period, calculating the amplitude and the phase of the subharmonic voltage by using an amplitude and phase identification module; generating a PWM control signal based on the sub-harmonic voltage amplitude and the sub-harmonic voltage phase by using a motor control module; and controlling the permanent magnet direct current motor according to the PWM control signal. According to the method, the control effect of motor thrust fluctuation suppression under complex working conditions can be improved.

The utility model provides a paint grinding mechanism for a four-wire copper wire lamp machine, which comprises a main body assembly, and the main body assembly comprises a permanent magnet direct current motor, two sliding blocks, an air cylinder fixing seat and a paint grinding supporting plate. The permanent magnet direct current motor is installed on the upper surface of the motor fixing base through the motor base. The permanent magnet direct current motor drives the adapter to rotate, the adapter drives the grinding rod and the grinding rod to rotate at a high speed and a constant speed, a copper wire penetrates into the position between the paint grinding supporting plate and the grinding rod from the position above the wire guide wheel and then is connected with the winding mechanism on the rear portion, and the copper wire makes contact with the outer wall of the wire guide wheel and the upper surface of the paint grinding supporting plate. The paint grinding supporting plate is pushed upwards through the adjusting air cylinder, the paint grinding supporting plate drives the copper wire to make contact with the grinding rod upwards, and then insulating materials on the surface of the copper wire can be ground away; in the paint grinding operation process, the height of the paint grinding supporting plate can be adjusted through the adjusting air cylinder according to the use requirement, and then a copper wire is prevented from being ground off.

The utility model discloses a permanent magnet direct current booster pump which comprises a first shell and a second shell, the first shell and the second shell form a cavity, a pump body is installed in the cavity, and the outer wall of the first shell is detachably connected with an installation plate used for installing the first shell on a wall. A positioning groove is formed in the first shell, a through hole is formed in the top end of the positioning groove, a hanging lug corresponding to the positioning groove is arranged on the side wall, close to the first shell, of the mounting plate, the hanging lug is connected with the positioning groove in a matched mode, and the tail end of the hanging lug extends into the through hole. The mounting plate is fixed to the wall through the mounting holes formed in the mounting plate, then the first shell is hung on the hanging lugs through the positioning grooves, the mounting mode is rapid and convenient, and the pump body is convenient to disassemble, maintain or replace.

The utility model discloses a permanent-magnet direct-current motor with a heat-resistant function, which belongs to the technical field of permanent-magnet direct-current motors and is characterized in that a stator is mounted on the inner wall of a casing, a plurality of windings are arranged on the inner wall of the stator, and a rotor is rotatably arranged in the middle of each winding; a cooling frame is installed on the outer wall of the machine shell, a cooling cavity is formed between the cooling frame and the outer wall of the machine shell, multiple sets of air inlet bins are further arranged on the outer wall of the machine shell, and main body parts of the air inlet bins are located in the cooling cavity; an outer air inlet groove is formed in the outer wall of the cooling cavity, an inner air inlet communicated with the air inlet bin is formed in the outer wall of the machine shell, and multiple sets of exhaust ports are formed in the top of the top cover. According to the utility model, double cooling can be carried out through the cooling cavity and the air inlet bin, and external lower air can firstly enter the air inlet bin to be cooled and then enter the interior of the shell through the inner air inlet. Through the cooperation of the sliding seat and the sliding block, the stability and the convenience of the stator during installation can be improved, and the practicability and the stability of the permanent magnet direct current motor are improved.

The present application discloses a feedforward control of a multiphase permanent magnet DC motor drive. A system and method for controlling the output torque of a permanent magnet DC (PMDC) machine includes a PMDC motor and a controller, wherein the PMDC motor includes multiple sets of windings. The PMDC motor is configured to generate an output torque. The controller is configured to: for a first set of windings of the PMDC motor, determine a first voltage command based on a first input torque command signal and a back electromotive force voltage drop of the first set of windings; for a second set of windings of the PMDC motor, determine a second voltage command based on a second input torque command signal; and selectively control the PMDC motor according to the first voltage command and the second voltage command.

The invention relates to the technical field of gardening tools, and discloses a pair of gesture and manual dual-mode control electric high branch scissors which comprises a fixed shell, a sliding shell capable of relatively rotating, a cutting assembly and a wearable manipulator. A main controller, a bevel gear set, an angle adjusting disc, a shear switch and a main switch are sequentially arranged in the long rod from top to bottom. A lithium battery is located at the bottom of the long rod. The sliding shell is coaxially connected with the worm gear in the upper semi-arc-shaped shell so as to realize sliding rotation; the cutting assembly comprises a fixed blade and a sliding blade coaxially connected with the permanent magnet direct current motor. The wearable manipulator communicates with the main controller through the wireless module so as to remotely control pitching and fitting actions; the main controller drives the servo motor or the permanent magnet direct current motor to complete pitching adjustment and blade opening and closing according to received gesture signals or manual input from the angle adjusting disc. The high branch pruning efficiency and convenience are effectively improved.