356 results about "Permanent magnet direct current" patented technology

A permanent-magnetic DC motor bearing similar characteristics with the constant power pulling motor, in particular a new drive control system for brushless motor adopts new technologies of full electronic drive control and DC-DC transducer. The motor can generate great drive torque, i.e. high tractive force, climbing ability and better acceleration performance with low power consumption, and eliminate the needs for improvement to the motor structure, complication, high manufacture cost or weak magnetic control; the motor may further gain such performance as high speed, wide speed regulation and infinite variable speed under light load; the total voltage of the battery and the number of single series of connection can be reduced; controllable electric brake can be realized through fully utilizing the energy feedback during sliding and braking. The new system can significantly improve the kinetic performance, safety and reliability of electric vehicles and remarkably reduce operating costs, with ideal characteristics expected in various electric vehicles powered by rechargeable battery or/and super capacitance as well as significantly expanded work scope and capacity for conventional electrically driven system.

The invention relates to a disc type iron-core-free PMDC motor. The disc type iron-core-free PMDC motor comprises a middle stator and rotors which are installed on a spindle and in disc shapes, disc surfaces are arranged parallelly and correspondingly, gap flux densities on two sides of the stator are the same, the stator comprises an iron-core-free rolled annular winding which is placed axially, and a magnetic line of force passes gaps and the winding axially; and each rotor is a disc composed of a magnetic conducting disc for accommodating magnetic steel and an aluminum case, a permanent magnet is bonded on the magnetic conducting disc in an N and S alternating mode, and polarities of magnetic steel corresponding to the rotors up and down are opposite. The disc type iron-core-free PMDC motor is characterized in that the annular winding is an axial symmetry conical ring composed of a plurality of sections of arcs, the central axis points to the axis of the stator, and the tip of the conical ring is close to the axis of the stator. The magneto-electricity conversion efficiency of the motor is improved by above 10%.

A brushless permanent-magnet direct current motor has a permanent magnet which is magnetized to create an offset angle between detent and mutual torques for providing sufficient starting torque for all relative orientations between the stator and the rotor of the motor. This is accomplished by providing a permanent magnet in which the global magnetization of the magnet has been disrupted by the application of a local magnetic field to a portion of the magnet, thereby to provide a magnetic anomaly in the global magnetization. Also, a method of magnetization of the magnet is described.

The invention provides a startup method of a permanent magnet direct current brushless hall-less motor, which comprises the following steps of: applying single-pulse voltage on any two phases of three phases of the motor; detecting and recording the value of the current passing through the two phases when the pulse is about to end; repeating the previous process to finish six-step energization and current detection of the motor; comparing all current values, finding out the maximal value and a corresponding energization phase, and judging the position of a rotor of the motor; and starting the motor according to the position of the rotor. Correspondingly, the invention also provides a startup device of the permanent magnet direct current brushless hall-less motor. By using the startup method and the startup device, forcible positioning is not necessary when determining the position of the rotor before the motor is started, the application range of the motor is not influenced, the motor is not impacted when started, and the starting process is smooth and reliable. Besides, the motor is powered on and detected based on the current condition without extra hardware resources, the startup method and the startup device are simple to implement and have low cost, and the starting speed of the motor is quick.

The portable mini electric bicycle consists of one inner rotating embedded foldable frame, light energy saving electric hubs, one mixed tooth-chain driving mechanism, one turnable crank and one control system with hidden string. The inner rotating embedded foldable frame consists of main beam, folding frame with T-joint, forked beam, front fork, U-shaped combined handlebar, seat beam on the vertical beam and bracing boom; the light energy saving electric hub consists of disk type permanent magnetic DC motor, bearing cover plate, internal gear and driving wheel; the mixed tooth-chain driving mechanism consists of main gear, flywheel, middle gear and protecting cover; the turnable crank consists of crank seat, turnable crank and resetting spring mechanism and the control system consists of control compartment, accumulator, electronic controller, speed regulating handle, braking handle, power cord and braking thread.

A permanent magnet DC motor 10 having electromagnetic interference (EMI) suppression includes a metal motor housing 12 and a brush card assembly 34. The brush card assembly includes brushes 20 and leads 24 constructed and arranged to be coupled with a source of power to power the motor. A brush card housing 14 has a first portion 18 housing the brushes and a second portion 22, integral with the first portion, and housing the leads. A printed circuit board 26 is mounted with respect to the second portion of the housing and carries at least one electromagnetic interference (EMI) suppression component 30 constructed and arranged to suppress EMI generated by the motor. The leads are electrically connected to the printed circuit board so that current can be provided through the printed circuit board to the brushes. A contact member 40 is electrically connected between the printed circuit board and the metal motor housing so that the at least one EMI suppression component couples the brushes to the metal motor housing thereby causing the metal motor housing to become an AC ground and EMI shield.

The invention discloses a multi-winding motor for an electric vehicle/electric automobile, and belongs to permanent magnet direct current motors. The multi-winding motor comprises a rotor and a stator, wherein the rotor rotates around the shaft of the rotor; the stator encircles the rotor; the stator is provided with more than one coil winding which is divide into first coil windings (A1, B1 and C1) and second coil windings (A2, B2 and C2); the first and second coil windings are mutually independent and can be connected in series and in parallel through a relay selector switch according to a requirement. The motor can serve as an alternating current motor to generate power.

The invention discloses a core-free permanent magnet direct current motor with an axial magnetic field for an electric vehicle. The motor comprises permanent magnets, magnetic conduction yokes, a bearing, a shaft core and a hub. A core-free inner stator is arranged coaxially on the shaft core. The two sides of the inner stator are coaxially provided with a rotor on which an even number of permanent magnets are uniformly distributed respectively. The inner edges of the rotors are connected with the magnetic conduction yokes on the two sides of the motor respectively, and are arranged together with the shaft core of the motor by the bearing. The outer edges of the rotors are connected together with the hub of the motor by the magnetic conduction yokes. The two sides of the stator are provided with the rotor respectively, a core and a toothed groove are not required, the dual rotors and the single stator form dual air gaps, and the magnetic field is axial. The efficiency of the motor is improved, effective metal materials are saved, the life mileage of the motor is increased, the climbing capability of the motor is improved and the battery replacement cycle of the electric vehicle is prolonged; and the motor is particularly suitable for use as a driving motor for the electric vehicle.

The invention discloses a magnet force device and relates to an application of magnets in electromechanical devices. The magnet force device solves the problem of taking out energy from magnetic fields of the magnets and saves energy by means of the magnets. A force except for the attractive force and the repulsive force is further found out between two magnets, a movable magnet is arranged in the magnetic field of a static magnet, the included angle formed between the pole axis direction of the movable magnet and the pole axis direction of the static magnet is 90 degrees, the static magnet does not move, and the movable magnet moves due to the force which is called the magnet force. The attractive force and the repulsive force are respectively arranged on the outer side of the magnetic field of the static magnet. The attractive force, the repulsive force and the magnet force can serve as the pushing force, so that energy can be saved. The attractive force and the repulsive force can also be avoided, and only the magnet force of the magnets serves as the main power for motion to form a power device of linear motion or rotation motion, so that a large amount of energy can be saved. The magnetic field of the static magnet can be replaced by the magnetic field of an electromagnetic coil, and the movable magnet can move due to the magnet force, so that a power device the same as a permanent magnet direct current motor can be formed.

The invention relates to an anti-explosion permanent magnet direct-current brushless motor with a controller, mainly comprising a motor, a stator, a rotor, a controller, a connecting box, a strong current connector post, a weak current patching panel, a protective cover, a fan, a motor shaft, a sealing bearing, a stator coil, a stator silicon steel sheet, a rotor neodymium iron boron magnet strip, a position sensor, a magnetic disc and a cable, wherein a structure for connecting the stator coil, the silicon steel sheet, the rotor neodymium iron boron magnet strip, the position sensor, the magnetic disc and the fan is adopted in the motor; the sealing bearing is used as the bearing of the motor, and the controller adopts microcomputer program control; and strong current control and weak current control are combined. The motor and the controller have advanced design, compact structure, safety, stability, reliability, high efficiency, energy saving, large overload torque, dust and water proofing, no brush and stepless speed change and is an ideal anti-explosion, permanent magnet, direct current and brushless motor with a brake.

A permanent magnet D.C. electric motor 36 includes a motor housing 29 having first and second ends. The second end 42 is substantially closed and has an end of a shaft 35 extending there from. The second end includes vent holes 20 therein. The first end 27 is substantially open. An end cap 31 closes the first end of the housing. The end cap 31 has venting holes 34 therein for permitting air to pass there-through to cool the motor. A splash shield 32 is integral with the end cap 31 and covers the venting holes 34 in such a manner to limit foreign matter from entering the venting holes while permitting air to flow through the venting holes.

The invention provides a semi-automatic short-range cutting machine and a cutting method thereof and relates to a small-sized machine used for cutting a profile steel docking groove. The semi-automatic short-range cutting machine comprises a cutting torch (8), on which a manual micromatic setting device (6) is arranged; the manual micromatic setting device (6) is installed on a machine base (3); the machine base (3) is installed on a rail (1-5) in an adjustable quadrilateral mechanism (1) through a rail slider (2); an angle adjustment device (7) is installed at the bottom of the manual micromatic setting device (6); the machine base (3) is provided with a permanent magnet direct current deceleration motor (5); a gear rack (4) is used for realizing the transmission between the permanent magnet direct current deceleration motor (5) and the rail (1-5) so as to drive the cutting torch (8) to run to finish cutting task; a strong-force magnetic base (1-1) consists of two adjacent rotary fixing points and two rotary or clamped fixing points in the adjustable quadrilateral mechanism (1) so that the whole machine is firmly fixed on a processed workpiece. The invention fills the blank in the prior art; the semi-automatic short-range cutting machine has advantages of simple structure, portability and capability of site operation; and the provided cutting method can effectively guarantee cutting quality.

The invention relates to a flexible rope driving device having automatic rope arranging and force measuring functions as well as a method. The device mainly comprises a photoelectric encoder, a permanent-magnet direct-current torque motor, a roller, a ball screw, a back support, a flexible rope, a U-groove guiding mechanism, a force measuring guiding mechanism, a circulation guiding mechanism, a locking device and the like. The roller is driven by the permanent-magnet direct-current torque motor to rotate and moves spirally under the co-constraint of the ball screw and cylindrical guide rails, and the two functions of rope winding and rope arranging can be realized simultaneously. The flexible rope winds around the roller and is output through the U-groove guiding mechanism, the force measuring guiding mechanism and the circulation guiding mechanism sequentially. Two times of the flexible rope tension is measured by a tension sensor, so that the noise of the sensor and the effect of the inertia of the sensor on the measurement result can be reduced; and the locking device controls rotation of the screw, and thus the rope arranging function can be started and stopped. The device has the basic functions of rope winding, rope arranging, guiding, force measuring, jamming prevention and the like, adopts the modular design as a whole, is simple in structure, small in occupation size and high in force measuring accuracy, and the flexible rope winds evenly.

Technical solutions are described for a motor control system of a motor to compute a disturbance estimate and use the disturbance estimate to improve the performance of the motor control system. For example, the motor control system includes an observer module that receives an input voltage signal of the motor. The motor control system also receives an output current signal from the motor. The motor control system further computes the disturbance estimate of the motor control system based on a plant model of an electrical subsystem of the motor control system.

The invention provides a method for controlling a permanent magnet direct current brushless without hall motor, comprising the following steps of: measuring a three-phase counter electromotive force of the motor and starting the motor; measuring a phase voltage of any phase in a PWM (Pulse Width Modulation) signal dead zone period of the one phase of bridge arm in a driving circuit of the motor so as to obtain a zero crossing point of phase current of the phase to further determine the time required when the phase current passes through a 360-degree electrical angle; and carrying out three-phase voltage sine pulse width modification (SPWM) on the motor so as to control the motor. Correspondingly, the invention also provides a device for controlling the permanent magnet direct current brushless without hall motor. After the motor is started, the phase voltage of any phase is measured at the PWM signal dead zone period of the one phase of the bridge arm of the driving circuit of the motor to finally obtain the time required when the phase current passes through the 360-degree electrical angle, and then the motor is controlled by using a three-phase SPWM method. In the invention, the motor is controlled on the basis of the existing conditions without extra hardware resources; and the invention is simple and reliable and has good controllability and low cost.

The invention discloses a method for installing a large-caliber permanent magnet direct-current torque motor. The method includes the following steps: (1) a motor stator and a ball bearing are firstly installed in a rotating base; (2) a motor rotor is installed outside a rotating shaft; (3) a guide sleeve fixed to a small disc penetrates through a center through hole in a large disc, and then the large disc is arranged on the outer end faces of three supporting columns; (4) the inner diameter of a guide base is matched with the outer diameter of the guide sleeve, and the guide base is fixed to the large disc; (5) the rotating shaft is downwards slowly moved through a hoisting tool along the guide base under the effect of gravity and slightly rotated around the guide base for enabling the shaft shoulder end face of the rotating shaft to be matched with the inner ring end face of the ball bearing; (6) the distance between the outer end face of a bearing block and the outer end face of the rotating shaft is measured to the required position size, and installation of the torque motor is completed. The method has the advantages of being simple and easy to implement.

The invention relates to a flux weakening control method and device for a permanent magnet direct-current motor. The flux weakening control method comprises steps as follows: calculating an error of a voltage mode according to a voltage value output by a current loop controller in a dq rotating coordinate system and a limit value of the voltage mode; calculating a compensation angle according to the error of the voltage mode and an electrical angular velocity of a rotor; obtaining an MTPA (maximum torque per ampere) angle according to a current reference vector; adding the compensation angle to the MTPA angle to generate a flux weakened phase angle; calculating a current reference value in the dq rotating coordinate system according to the flux weakened phase angle and the current reference vector and transmitting the current reference value in the dq rotating coordinate system into the current loop controller. With the implementation of the technical scheme, few algorithm links are needed, the debugging process is simple, and high-frequency noise is reduced.

The invention provides a permanent-magnet direct current motor brake device completely achieving brake through electrical actions and having the advantages of being large in braking torque, high in brake speed, good in effect, fast in reaction, good in reliability and high in safety factor. The device is composed of a voltage detection module, i energy consumption braking modules and a zero-voltage braking module. When a zero voltage or under voltage is detected by an input detection module, the first energy consumption braking module works, a power transistor is saturated and switched on, an energy consumption resistor is connected to the two ends of the motor, inertia mechanical energy of a rotor is converted to electric energy, the electric energy is transmitted to the energy consumption resistor to be consumed through heating, and accordingly the motor can operate under braking. Voltage continuously decreases as the braking time of the motor increases. The first module is not in a saturation state any more because the voltage is too low, a high level is output by a control terminal, the next-level energy consumption braking module starts to work, and the first energy consumption braking process is repeated until the last module works.

The invention aims to provide a flexible cable driving unit. The driving unit comprises a driving unit bracket, a revolving flexible cable guide device, a permanent magnet direct current moment motor, a fixed flexible cable guide device, a flexible cable traction wheel and a guide shaft, wherein the permanent magnet direct current moment motor is arranged outside the driving unit bracket; the flexible cable traction wheel is arranged in the driving unit bracket; an output shaft of the permanent magnet direct current moment motor is connected with the flexible cable traction wheel; the revolving flexible cable guide device is connected with the fixed flexible cable guide device through the guide shaft; the fixed flexible cable guide device is fixed in the driving unit bracket; the revolving flexible cable guide device and the guide shaft are arranged outside the driving unit bracket; and a flexible cable is wound on the flexible cable traction wheel and passes through the fixed flexible cable guide device, the guide shaft and the revolving flexible cable guide device. The flexible cable driving unit can drive the flexible cable in a spatial multi-degree-of-freedom mode, is modular,has a compact integral structure and light weight, and is convenient to transport, assemble and disassemble spatially.