32 results about "Permanent magnet direct current" patented technology

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.

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 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 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.

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 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 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 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 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.

The utility model relates to a large-scale permanent-magnet direct-current brushless industrial ceiling fan motor, which belongs to the technical field of industrial ceiling fan motors and comprises a beam, an adjusting disc is arranged at the bottom of the beam, mounting grooves are formed in the adjusting disc at equal intervals, screw rods are rotatably mounted in the mounting grooves, and threaded blocks are in threaded connection with the outer sides of the screw rods. The threaded blocks are slidably connected with the inner walls of the corresponding mounting grooves, and the tops of the threaded blocks are rotationally connected with connecting rods. The beneficial effects of the utility model lie in that when the angles of the adjusting disc and the brushless motor need to be adjusted, a worker can rotate the one-way or multi-way screw rod, so that the threaded block slides in the corresponding mounting groove, and then the angle of the adjusting disc can be adjusted by means of the connecting rod so as to adapt to the mounting requirements of different angles; and therefore, the inclination phenomenon of the industrial ceiling fan in the using process can be avoided, and the using safety of the device can be improved.

The utility model relates to an isolating switch part, in particular to a permanent magnet direct current speed reducing motor. The device comprises a motor and a reduction gearbox, the output end of the motor extends into the reduction gearbox and is sequentially meshed with a first-stage reduction gear, a second-stage reduction gear and a third-stage reduction gear, and the first-stage reduction gear, the second-stage reduction gear and the third-stage reduction gear are all in running fit with the reduction gearbox. The three-stage speed reducer is characterized in that a clutch is arranged in the speed reduction box, a clutch large gear and a clutch small gear are arranged on the clutch, and the clutch large gear is meshed with the output end of the three-stage speed reduction gear. An output shaft is arranged in the reduction gearbox, the output shaft is in running fit with the reduction gearbox, an output gear is fixedly connected to the output shaft, and the output gear is meshed with a clutch pinion of the clutch. The permanent-magnet direct-current speed-reducing motor not only can reduce the stress of the output end of the clutch and prolong the service life of the permanent-magnet direct-current speed-reducing motor, but also can improve the response speed of the clutch and timely control the isolating switch.

The utility model relates to a permanent magnet direct current brush fan, which comprises a motor comprising a rotor assembly, a stator assembly, a brush carrier assembly and an end cover, one end of the rotor assembly is mounted in the end cover; the brush carrier assembly is fixed on the end cover and is connected with the rotor assembly; a certain air gap is kept between the stator assembly and the rotor assembly, and the rotor assembly can rotate in the stator assembly; the fixed impeller is fixedly arranged on the outer wall of one end of the motor; and the movable impeller is fixed at the other end of the rotor assembly through a nut. According to the utility model, the whole fan is convenient to mount and dismount, and the maintenance cost is reduced.

The invention is suitable for the technical field of permanent magnet direct current motors, and provides a permanent magnet direct current motor control device which comprises a base, a supporting plate is fixedly installed at the top of the base, a motor body is fixedly installed at the top of the supporting plate, a box body is fixedly connected to the top of the base, and a fan is fixedly installed at the top of the base. According to the permanent magnet direct current motor control device, the exhaust pipe exhausts gas through the exhaust holes, so that the gas in the motor body is disturbed, the gas in the motor body is driven, heat in the motor body can be exhausted to the external environment more smoothly, the heat dissipation efficiency is improved, and the service life of the motor body is prolonged. And meanwhile, the motor body is surrounded by the first heat dissipation spiral pipe and the second heat dissipation spiral pipe, so that a part of heat on the outer surface of the motor body can be taken away in the process that gas flows in the first heat dissipation spiral pipe and the second heat dissipation spiral pipe.

Device for generating pulsation for a washbasin seat (10) with which the flushing water spraying towards the human genitals is pulsated, the device comprising the following elements: an electric motor (30); a linear motion element (39) that is linearly movable such that the volume of a pump chamber (24a) arranged on a flow channel of the rinse water is changed depending on the rotation of the electric motor (30); and a stroke quantity setting means (40) with which the stroke quantity of the linear motion part (39) can be adjusted, wherein the stroke quantity setting means (40) is a control means (40) with which the electric motor (30) can be controlled so that it is driven alternately in the forward direction and in the opposite direction within a certain angular range which includes less than 180 degrees, the electric motor (30) is a DC motor (30) with permanent magnets, and the DC motor (30) can be controlled by the control means (40) such that it rotates in the forward direction when the current is switched on and in the opposite direction when the current is switched off due to a cogging torque.

The utility model provides an inner rotor brushless permanent magnet direct current motor without a shell shape, which belongs to the technical field of electric tool motors and comprises a motor main body. According to the utility model, the phase power line of the Hall plate assembly is connected with the controller on the equipment, the Hall element of the Hall plate assembly induces the position angle condition of the magnet in the rotor assembly, the controller orderly supplies power to the stator assembly, the motor main body has no rotor core, and the rotor core, the process and the tool do not need to be assembled by stamping; the motor body is compact in structure, small in size and high in applicability, the magnets can be limited and fixed under the arrangement of the first sheath, the second sheath and special glue, and the motor body can be cooled by positive and negative rotation air draft under the arrangement of the axial-flow blades of the rotor fan blades, so that the service life of the motor body is prolonged. Therefore, the problem that the motor main body is easy to fail in a high-temperature environment is solved, and the service life of the motor main body in the high-temperature environment is prolonged.

The invention discloses a three-phase brushless permanent magnet direct current motor which comprises a motor shell, a stator assembly is arranged in the motor shell, a rotor assembly is movably arranged in the stator assembly, a motor rotating shaft is fixedly arranged in the rotor assembly, and the two ends of the motor rotating shaft are arranged in the motor shell through bearings respectively. The motor is characterized in that the stator assembly comprises an installation cylinder, a plurality of installation groove holes are evenly distributed in the installation cylinder in the circumferential direction, stator iron cores are movably arranged in the installation groove holes, coils are wound on the stator iron cores, the air gap sensor is connected with the controller, and the controller is connected with the motor. And a dynamic adjusting mechanism capable of driving the stator core to move so as to adjust the air gap between the stator core and the rotor assembly is arranged in the motor shell. In order to overcome the defects in the prior art, the invention provides the three-phase brushless permanent magnet direct current motor which is simple in structure and can dynamically adjust the air gap according to different working conditions.

The invention provides a photovoltaic water pump power conversion device, which relates to the field of new energy power electronics and comprises a Boost-Buck converter, an RS485 communication interface, an RS232 communication interface, a microprocessor, a photovoltaic module, an irradiance sensor, an upper computer, an auxiliary power supply, a voltage and current detection device, a grid driving chip, a flow sensor and a permanent magnet direct current water pump which are cascaded, the photovoltaic module is connected with the input port of the cascaded Boost-Buck converter, and the output port of the cascaded Boost-Buck converter is connected with the permanent magnet direct current water pump. The method solves the problems that when the motor load changes instantaneously, the duty ratio cannot be adjusted in time through single-duty-ratio control, large overshoot or drop of the output voltage can be caused, working modes need to be switched frequently through double duty ratios, efficiency is low, and smooth transition between the modes is difficult to achieve.

The application relates to a micro-distance permanent magnet DC micro-rotation motor capable of realizing high-precision reciprocating transmission, and belongs to the technical field of micro special motor, which comprises a motor base and a rotor arranged in the motor base, a ring-shaped permanent magnet is fixedly sleeved on the rotor, the ring-shaped permanent magnet is movably arranged in a coil framework, a high-temperature armature winding is wound on the coil framework, and a connecting post connected with two ends of the high-temperature armature winding is arranged on one end of the coil framework; the two ends of the rotor are rotationally connected with the coil framework through bushings; a containing chamber is arranged on the motor base, and a ring-shaped magnetic yoke is fixedly arranged in the containing chamber; compared with the previous continuous rotation motor mechanical transmission mechanism, the application has the advantages of stronger comprehensive environmental adaptability, smaller size, lower power consumption, larger output torque, stronger anti-interference capability, higher reliability, easier processing and lower cost.

The invention discloses an energy release unit, a control method thereof and a compression energy storage system. The energy releasing unit comprises a turbine with a rotating shaft assembly, the first end of the rotating shaft assembly is connected with a first generator, and the second end of the rotating shaft assembly is connected with a second generator. The first generator is used for converting mechanical energy of the rotating shaft assembly into electric energy and transmitting the electric energy to a power grid in the stable operation stage of the energy release unit. The second generator is a permanent magnet direct current generator and is used for converting mechanical energy of the rotating shaft assembly into electric energy and transmitting the electric energy to the storage battery assembly in the shutdown stage of the energy release unit, so that rotating kinetic energy of the rotating shaft assembly can be recycled for power generation, and energy waste is reduced; the second power generator can provide electromagnetic resistance for the rotating shaft assembly while generating power, so that the rotating shaft assembly stops rotating more quickly, the downtime of the energy release unit is shortened, an auxiliary machine system can correspondingly stop running in advance, the auxiliary power consumption is reduced, and the comprehensive economic benefits of running of the energy storage system are improved.

The invention belongs to the field of motor testing, and particularly relates to a permanent magnet direct current frequency conversion aluminum wire motor performance testing and verifying device which comprises a workbench, a motor to be tested, a testing table, a reliability testing device, a static testing device and a dynamic performance testing device. A transmission mechanism is connected into the transverse groove, positioning blocks which are symmetrically arranged are fixedly connected into the transverse groove, clamping table plates which are in transmission connection to the transmission mechanism are symmetrically arranged on the front sides and the rear sides of the positioning blocks, and vertically upward guide columns are fixedly connected to the two ends of the transverse groove; the static testing device and the dynamic performance testing device are arranged on the outer sides of the two clamping table plates in a left-right staggered mode, and the reliability testing device is slidably connected to the guide columns and fixedly connected with the output end of the second air cylinder device. And the performance test and verification efficiency is greatly improved.

The application discloses a kind of rubber magnetic strip's permanent magnet DC brushless outer rotor motor, including outer rotor assembly, stator assembly, control circuit board, the outer rotor assembly includes magnetic ring and the transmission shell of setting in the magnetic ring outside, the magnetic ring is by rectangular parallelepiped rubber magnetic strip and is made into circular ring by deformation, the end face of the rubber magnetic strip one end forms first inclined plane, the end face of the rubber magnetic strip other end forms second inclined plane, so that motor air gap is adjacent to magnetic field intensity greater than outer ring surface magnetic field intensity, improve effective magnetic energy product, improve weak magnetic performance into medium magnetic performance, satisfy motor work demand;The first inclined plane and the second inclined plane of the magnetic ring ring body made of the rubber magnetic strip are oppositely arranged to form inclined pole gap, and the design of inclined pole gap can weaken total tooth harmonic strength, and have certain noise reduction effect.

The utility model discloses an internal circulation oil cooling type permanent magnet direct current motor, and belongs to the technical field of motors. The internal circulation oil cooling type permanent magnet direct current motor comprises a cooling base, a clamping groove is formed in the upper surface of the cooling base, a transition cavity is connected into the clamping groove in a clamped mode, a motor body is fixedly connected into the transition cavity, an oil storage rotating groove is formed in the motor body, and rotating openings are formed in the two ends of the oil storage rotating groove. Limiting circular grooves are formed in the rotating openings, and the interiors of the two rotating openings are jointly and rotationally connected with a rotating rod; the heat dissipation design of the internal circulation oil cooling type permanent magnet direct current motor has many advantages. A unique oil cooling circulation system enables cooling oil to stably circulate between the oil storage rotating groove and the transition cavity by means of rotation of the oil pumping fan blades. In the process, the cooling oil can fully absorb heat generated by the winding and the iron core, and the heated cooling oil is sent back to the transition cavity for heat dissipation through the oil outlet pipe.

The utility model discloses a permanent magnet direct current motor, which relates to the technical field of permanent magnet direct current motors and comprises a stator yoke, a permanent magnet is arranged in the stator yoke, a rotor iron core is further rotatably mounted in the stator yoke, a plurality of iron core grooves are arranged on the rotor iron core, and the number of the iron core grooves is eight. The eight iron core grooves are formed in the periphery of the rotor iron core at equal intervals, the number of the permanent magnets is two, the two permanent magnets are symmetrically installed on the inner side wall of the stator yoke, and the rotor iron core is located between the two permanent magnets; according to the permanent magnet direct current motor, skewed slots, skewed poles, rotor notch width reduction and inner and outer circle non-concentric magnets are not needed, only the pole-arc coefficient of the magnets needs to be selected to be 0.75-0.8, the permanent magnet direct current motor has the advantages of being small in cogging torque, electromagnetic vibration and electromagnetic noise and high in mechanical performance, especially when the pole-arc coefficient is 0.75, the cogging torque is close to 0, the cost performance is high, and the permanent magnet direct current motor is suitable for large-scale popularization and application. And the quality and economic benefits are obvious.

This invention relates to the field of micro-motors, specifically a micro-motor capable of high-precision reciprocating transmission. It comprises a motor base and a rotor housed within the motor base. A ring-shaped permanent magnet is fixedly sleeved on the rotor and movably disposed within a coil frame. A high-temperature armature winding is wound on the coil frame, and one end of the coil frame has terminals connected to both ends of the high-temperature armature winding. Both ends of the rotor are rotatably connected to the coil frame via bushings. The motor base has a receiving chamber, within which a ring-shaped magnetic yoke is fixedly disposed. Compared to conventional continuous rotating motor mechanical transmission mechanisms, this invention offers stronger environmental adaptability, smaller size, lower power consumption, greater output torque, stronger anti-interference capability, higher reliability, easier processing, and lower cost.