301 results about "Induction motor" patented technology

An electronic starting switch assembly and control methods for a dryer having a split-phase induction motor. The assembly comprises a microcontroller unit (MCU) configured to execute a control method that dynamically manages the motor's operation by monitoring the forward magnitude current. The MCU determines a stabilized startup forward magnitude current and calculates a crossover condition, allowing for precise control of the motor's transition to single-phase operation by disconnecting the auxiliary winding and connecting the heater element based on real-time forward magnitude current analysis and processing. The system can also monitor for overload conditions indicative of rotor speed drops and can re-engage the auxiliary winding to maintain motor performance. The assembly includes a housing with a heat-sink for efficient thermal management and environmental protection of electronic components. The disclosed method provides a robust solution for efficient dryer operation by ensuring accurate control of motor start-up, running conditions, and overload protection.

An electric valve / door, and a control apparatus and method thereof are provided. The electric valve / door includes a control apparatus. The control apparatus includes an alternating current (AC) asynchronous motor, a transmission device, and a valve driver. The valve driver is connected to the AC asynchronous motor. The AC asynchronous motor is connected to the valve / door through the transmission device. The valve driver is configured to collect information of a real-time torque of the AC asynchronous motor or the valve / door during operation, and take a set torque of the valve driver as an input and the real-time torque as a feedback to immediately correct an output torque of the valve driver or a limit value of the output torque by using a proportional-integral-derivative (PID) control algorithm, to meet requirements for response speed and control precision of each stage in opening and closing processes of the valve / door.

The invention discloses an electronic switch assembly and a control method of a split-phase starting single-phase induction motor for a household clothes dryer. The assembly comprises an MCU, the MCU is loaded with a real-time algorithm software control program, and the starting speed state of the motor can be detected by analyzing and processing the change of steady-state positive sequence amplitude current in the starting process. Based on real-time positive sequence amplitude current analysis processing, the MCU calculates and detects an overspeed condition in real time, disconnects an auxiliary winding and connects a heater element so as to accurately control the transition of the motor to single-phase operation until a rated rotating speed is reached. Based on real-time positive sequence amplitude voltage and current analysis and processing, the overload condition of rated rotor speed reduction can be detected, and the auxiliary winding can be switched on again to maintain the operation performance of the motor. The assembly includes a housing having a heat sink for efficient thermal management and overheating protection of electronic devices. And an effective, reliable and low-cost solution is provided for the operation of the efficient clothes dryer by ensuring the accurate control on the starting and operating conditions of the motor and the overload protection.

A system for providing inrush current limiting for induction motor starting. The system utilizes a pre-start controller to initialize operation of a controller including multiple switches for controlling the voltage delivered to a motor having multiple phases. The pre-start controller activates each switch and determines whether a phase current flowing through the switches satisfies a threshold current. The switches are deactivated a phase current satisfies the threshold current. The pre-start controller determines an activation order for each phase and orders phases having higher phase currents higher in the order than lower phase currents, and determines an activation timing. Based on whether the highest phase current is positive or negative, the pre-start controller then activates, using a voltage at a corresponding angle and based on the activation order and activation timing, the phases to de-saturate the flux generated by the phase currents, thereby limiting an inrush current provided to the motor.

The invention discloses a variable frequency motor load testing device and method, and relates to the technical field of variable frequency motor testing, and the device comprises a motor testing installation platform, a fastening T-shaped bolt, two variable frequency speed regulation asynchronous motors of the same model, a drum-shaped coupler, two inverters, a rectifier, a three-phase voltage regulator, a frequency converter and an intermediate DC link. According to the invention, two frequency conversion speed regulation asynchronous motors of the same model are coaxially connected, and the power generation electric energy of the accompanying test motor is fed back to an intermediate direct current link through an inverter, so that the cyclic utilization of the electric energy and the dual-motor structural design are realized, complex load equipment does not need to be configured, and the fixed asset investment is reduced; for motors of different models, only corresponding accompanying test motors need to be replaced, the universality is improved, through voltage and current monitoring in an intermediate direct current link and motor rotating speed and torque parameter collection, and by combining a multi-dimensional performance evaluation model, precise evaluation of the motor load performance is achieved, the test efficiency is improved, and the strict test requirements are met.

The invention relates to a doubly-fed variable-speed pumped storage unit fractional order PID additional frequency control method and system, and the method comprises the steps: building an electrical mathematical model of a doubly-fed induction motor based on a synchronous rotating coordinate system, enabling a stator flux linkage to be aligned with the d-axis direction through employing a stator flux linkage directional control strategy, and enabling the stator flux linkage to be aligned with the d-axis direction; therefore, decoupling adjustment of active power and reactive power output by the unit is realized. The frequency deviation between the power grid common connection point frequency and the rated frequency is obtained and serves as an input signal of the fractional order PID additional controller, the frequency deviation can be effectively restrained under various working conditions, the system stability and the inertia supporting capacity are enhanced, and the method is suitable for auxiliary frequency control of a variable speed pumped storage unit in a high-proportion new energy power grid.

The invention discloses a double-fed asynchronous motor synchronous phase locking control method and device. The method comprises the steps that stator three-phase voltage, stator three-phase current instantaneous values and rotor three-phase current instantaneous values of a double-fed asynchronous motor are collected; acquiring a power grid voltage synchronous phase through a phase-locked loop; performing coordinate transformation on the stator three-phase current instantaneous value, the rotor three-phase current instantaneous value and the stator three-phase voltage based on the power grid voltage synchronous phase to obtain a coordinate transformation result; performing flux linkage calculation according to the coordinate transformation result to obtain a flux linkage calculation result; calculating a rotor voltage dynamic compensation item according to a coordinate transformation result and a flux linkage calculation result; performing power calculation according to a coordinate transformation result, and introducing a rotor voltage dynamic compensation item and a flux linkage calculation result according to a power calculation result to calculate and obtain a rotor target voltage reference value of the doubly-fed asynchronous motor; and generating a control signal according to the rotor target voltage reference value to control the doubly-fed asynchronous motor.

The utility model relates to a dual-drive high-efficiency high-reliability electric centrifugal pump set, which adopts a dual-drive motor to drive a centrifugal pump, the dual-drive motor consists of an asynchronous motor and a permanent magnet motor which are arranged in the same base, and a frequency converter is connected with the permanent magnet motor and is connected with the asynchronous motor through an electric cabinet. The frequency converter is used for supplying power to the permanent-magnet motor, the electric cabinet is used for supplying power to the asynchronous motor, and the permanent-magnet motor or the asynchronous motor drives the centrifugal pump to operate through the rotating shaft. During normal operation, the asynchronous motor is not electrified, and the permanent magnet motor is controlled by the frequency converter to start, regulate the speed and stop, so that the efficiency of the pump set during operation under a bias working condition can be improved, and vibration noise is reduced. When the frequency converter or the permanent magnet motor breaks down, the frequency converter sends a fault signal to the electric control box, the electric control box cuts off an output power supply of the frequency converter, and directly outputs a power frequency power supply to the asynchronous motor, so that continuous operation of the pump set is ensured, the task reliability of the pump set is improved, and damage to a system or emergency shutdown of the system caused by shutdown of the pump set is avoided.

The invention discloses a multi-process parameter identification method for an induction motor. According to the method, different parameter identification strategies are provided for different common working conditions in combination with an induction motor transient mathematical model. For motor starting and steady-state operation conditions, current deviation and impedance deviation are respectively adopted as objective functions, and motor parameters are identified by using an improved particle swarm algorithm. On the basis, accurate parameters such as stator and rotor resistance, stator and rotor leakage inductance and the like are provided for a control strategy during long-term operation of the motor by introducing a parameter change coefficient and considering nonlinear characteristics such as skin effect, magnetic circuit saturation, temperature and the like. According to the method, historical operation data of the motor are fully utilized, invasive experiments such as locked-rotor and signal injection do not need to be additionally carried out, and the method has the advantages of being good in engineering practicability and accurate in identification result.

The invention discloses an AC induction motor prediction control method based on gradient descent, and the method comprises the following steps: building a mathematical model of an AC induction motor, employing a sliding model reference adaptive MRAS observer, employing a gradient descent iteration method, employing the gradient descent iteration method as an adaptive law, and carrying out the iteration in the reverse direction of the gradient of a quantization error, the method comprises the following steps: searching a minimum value of a quantization error, performing model prediction torque control, obtaining a switching state of an upper bridge arm switching tube of each phase in an inverter in a driving system of the alternating current induction motor, selecting a switching state which minimizes a cost function, and outputting the switching state to the inverter, so as to accurately and quickly minimize the error, and improve the reliability of the inverter. And current tracking performance similar to carrier waves is realized.

The utility model relates to the technical field of oil pumping units, in particular to a permanent magnet axial magnetic flux driving device for an oil pumping unit, which comprises a base and a beam-pumping unit, and the beam-pumping unit is mounted on the upper side of the left of the base. The beam-pumping unit is reasonable and compact in structure, when the beam-pumping unit is used, the permanent magnet axial magnetic flux driving device is electrically connected with the frequency converter, the frequency converter drives the driving shaft of the permanent magnet axial magnetic flux driving device to rotate, the speed reducer connected with the driving shaft is used for speed reduction, and the output shaft of the speed reducer drives the beam-pumping unit to work to achieve the purpose of oil extraction. Compared with a traditional driving mode of a beam-pumping unit, the permanent magnet axial magnetic flux driving device can improve efficiency, reduce starting current, omit a transmission mechanism of a belt and a belt pulley, improve transmission efficiency, reduce maintenance cost and avoid potential safety hazards under the condition of the same specification and size. And the overload torque of the driving shaft can be improved, and more complex working conditions can be coped with.

A system includes an induction motor configured to drive an electric submersible pump (ESP). The induction motor includes a one or more rotors disposed about a rotational axis, and a plurality of bearings disposed about the rotational axis. Each bearing of the plurality of bearings is disposed axially between a pair of rotors of the one or more rotors. The induction motor further includes one or more stators disposed about the one or more rotors.

The invention discloses an AC excitation system no-load voltage buildup and pre-synchronization grid-connected control method and system, and the method comprises the steps: obtaining the amplitude and phase of a power grid voltage in real time through a phase-locked loop when the rotating speed of a doubly-fed induction motor reaches a synchronous rotating speed range; detecting the mechanical position of the rotor by using an encoder and calculating a slip angle; carrying out fundamental component extraction and phase correction on the stator side no-load voltage; setting a stator voltage target value based on power grid voltage directional control and calculating target rotor current; constructing a rotor current inner loop control loop, calculating a feedforward decoupling item and performing phase compensation; superposing a stator voltage outer loop control loop, and correcting the rotor current through closed-loop adjustment to eliminate the deviation between the stator side no-load voltage and the power grid voltage; and when a preset synchronization condition is satisfied, closing the grid-connected circuit breaker and switching a control mode. Accurate no-load voltage buildup and smooth pre-synchronization grid connection of the excitation system are achieved through a double closed-loop control structure, and the stability and reliability of the grid connection process are improved.

The utility model belongs to the technical field of water pump application, and particularly discloses a high-flow self-adaptive sewage pump. Comprising a fan blade cover, a motor rear end cover, a machine barrel, a motor front end cover, a pump head, fan blades, a shaft clamp spring, a stator assembly, a first rolling bearing, a rotor assembly, a volute, an impeller, a water retaining ring, a water outlet, a water inlet, a waterproof switch assembly, a switch sealing gasket, a capacitor, a capacitor box lower cover and the like which are assembled in a matched mode. The utility model has the beneficial effects that: before the water pump works, the vortex cavity needs to be filled with water; when the impeller rotates at a high speed, liquid between the blades rotates along with the blades, so that the liquid obtains higher pressure energy, and the lift is improved; the volute and the impeller are respectively made of integrally-formed gray cast iron and have good abrasion resistance, the service life of the volute and the service life of the impeller can be prolonged, and it is guaranteed that the water pump has the long service life under the high load. The working efficiency of the whole machine is improved by using a high-efficiency induction type motor; the hook structure facilitates storage of a power line, and the use convenience of the water pump is improved.

The invention discloses a doubly-fed induction motor parameter identification method based on adaptive extended Kalman filtering, and aims to solve the problems of low doubly-fed induction motor parameter identification precision and integrity, sensitive noise and the like in the prior art. According to a dq-axis flux linkage equation and a voltage equation of the doubly-fed induction motor, a state space model with dq-axis current of a stator and a rotor as state variables is built, the dimension of the state space model is expanded, the full-parameter observability of resistance Rs and Rr and inductance Ls, Lr and Lm of the motor is judged by utilizing a self-adaptive extended Kalman filtering theory and combining a rank criterion, and the accuracy and accuracy of the state space model are improved. All-parameter identification of inductance and resistance of the motor is realized, and the robustness of the system is improved through a method of adaptively adjusting noise covariance. The parameter coupling influence can be effectively eliminated, and the identification precision is improved; the self-adaptive noise suppression mechanism enhances the anti-interference capability, and meets the dynamic on-line parameter identification requirements of the doubly-fed motor.

The invention relates to a double-fed asynchronous motor debugging method and system based on a back-to-back converter, and belongs to the technical field of motor control. Comprising the following steps: supplying power to a three-phase alternating-current voltage regulator, and charging a direct-current bus capacitor by connecting a grid-side alternating-current contactor with a buffer resistor in parallel; when the DC bus capacitor is charged to a preset amplitude, the digital signal processor sends a closing signal to the AC contactor; after the alternating current contactor is switched on, pure open-loop debugging, current closed-loop debugging and rotating speed closed-loop debugging are respectively carried out on the rotor side; the upper computer controls the pulse width modulator to work, carries out excitation on the rotor, and monitors the voltage and phase of the stator end; when the voltage rises to a preset value and the phase is synchronized with the power grid, a closing signal is sent to the AC contactor at the stator side, and the motor stator is connected to the power grid. The problems that a traditional doubly-fed asynchronous motor is too large in starting current and complex in control link decoupling are solved, and the debugging reliability and efficiency are improved. In addition, debugging does not depend on additional prime mover dragging.

The utility model belongs to the technical field of engineering construction, and particularly relates to a multifunctional angle measuring instrument which comprises a bottom table, a rotary moving mechanism is arranged above the bottom table, and a measurement executing mechanism is arranged above the rotary moving mechanism. Through the arranged measurement executing mechanism, the measuring instrument is effectively moved, an induction motor is started to drive a lead screw to rotate, a lifting table is driven to ascend and descend, a pushing assembly is started to drive a distance measuring instrument to longitudinally move in a groove, the distance needing to be measured is measured, and a telescopic rod is moved to move; the moving distance is displayed through the fan-shaped graduated scale, and the lifting platform lifts and moves to drive the horizontal ruler, the height ruler and the angle measuring ruler to lift and move, so that the effective moving effect of the measuring instrument is ensured, more accurate measurement is facilitated, the measuring efficiency is improved, the measuring instrument can simultaneously measure the angle, the length and the perpendicularity, the operation is simple, and the cost is low. The practicability is high.

The invention provides an induction motor monitoring and early warning system and a related method. The induction motor monitoring and early warning system comprises a motor monitoring terminal, a motor comprehensive analysis platform and a motor, the motor obtains a first working mode of the motor and a first working parameter of the motor in a preset time period; the motor monitoring terminal determines a first working stability evaluation value of the motor according to the first working parameter; the larger the first working stability evaluation value is, the more stable the motor works; when the first working stability evaluation value is smaller than or equal to a first threshold value, determining a first anomaly detection model according to the first working mode and the first working stability evaluation value; determining a first anomaly detection result according to the first working parameter and a first anomaly detection model; and the motor comprehensive analysis platform determines a first early warning parameter according to the first anomaly detection result, and performs early warning operation according to the first early warning parameter. According to the scheme, abnormal conditions of the motor can be monitored in real time and early warning can be timely performed.

The present invention relates to the technical field of motor manufacturing, and in particular to a heat treatment device and a heat treatment method for asynchronous motor rotor punchings, wherein the heat treatment device comprises a heat treatment component and a rotor punching, wherein a base is arranged at the lower end of the heat treatment component, a round rod is arranged at the center of the heat treatment component, and a driving component is arranged at one end of the round rod, and the external thread is rotated by rotating the round rod, and the rotor punchings stacked on the round rod are separated one by one by rotating the external thread, so as to ensure that the rotor punchings can be better heat treated, and the rotor punchings after the heat treatment are dropped one by one, so as to ensure that the rotor punchings after the heat treatment are moved to the next step, and the rotor punchings will vibrate when they fall and contact with the filter screen, and the metal oxides on the surface of the rotor punchings after the heat treatment can fall under the action of the vibration, and the blocked filter screen can also be unblocked.

The invention relates to a method for diagnosing the state of an asynchronous motor (M) to which three-phase voltages UR, S, T (t) having a supply frequency (fU) are applied, comprising the following steps: a) detecting a voltage time sequence (Ut) of the voltages UR, S, T (t) and a current time sequence (It) of three-phase motor currents IR, S, T (t) flowing through the asynchronous motor (M) as a result of the voltages UR, S, T (t) applied to the asynchronous motor (M); b) calculating a current spectrum I (f, t) and a voltage spectrum U (f, t) on the basis of the detected time series (It, Ut) by means of FFT; c) calculating one or more of the following time-dependent spectral variables 1-6: 1) the current components Ia (f, t), Ib (f, t), where Ia (f, t) and Ib (f, t) are formed from IR, S, T by Park transformation; 2) total current amplitude AI (f, t) = square root of (Ia (f, t)) 2 + (Ib (f, t)) 2); 3) the phase angle phi ab (f, t) between the current components is equal to arctan (Ia / Ib); 4) the phase angle phi UI (f, t) between the current and voltage components = arctan (U (f, t) / I (f, t)); 5) instantaneous spectrum power P (f, t) = U (f, t) * I (f, t); 6) admittance X (f, t) = I (f, t) / U (f, t), d) is a spectral variable calculated for anomaly analysis; and e) reporting the exception when the exception is confirmed.

The utility model relates to the field of junction boxes, in particular to an ultra-high-efficiency three-phase asynchronous motor junction box which comprises a box body, a box cover is arranged at the upper end of the box body, a fixing part is arranged between the box body and the box cover, a plurality of annular separation grooves are formed in the outer side of the box body, and the separation grooves are communicated with the box cover. Through the arrangement of the separating groove, the check block, the fixing ring, the connecting ring, the sleeve and other components, in the working process, a worker can conveniently take out a designated part on the box body and separate the designated part from a main body through the separating groove, so that the trouble of drilling through a professional tool is avoided, the working efficiency is improved, and the working efficiency is improved. According to the device, the separation groove area can be reinforced through mutual cooperation of the stop block component and the fixing ring component, accidental falling is avoided, the effect of protecting the wire harness is achieved through mutual cooperation of the connecting ring component and the sleeve component, and therefore the device can be conveniently used by workers.

The invention discloses a reactive compensation method and device for a compressed air energy storage power station, and the method is applied to the compressed air energy storage power station, and comprises the steps: starting a multi-stage motor based on a preset time sequence, and enabling the motor to be used for controlling a compressor; determining a first compensation parameter of each motor of the multi-stage motor, wherein the first compensation parameter is used for representing the reactive power output capability of each motor; a first loss parameter of the compressed air energy storage power station is obtained, the first loss parameter comprises the reactive power demand of a target motor and the reactive power demand of auxiliary power, and the target motor comprises at least one motor. When air is compressed, the synchronous motor serves as a reactive power supply to supplement reactive power consumption of the asynchronous motor and auxiliary power; during expansion power generation, the synchronous generator serves as a reactive power supply to supplement reactive power consumption of auxiliary power.

The present invention relates to the field of motor technology, and specifically to a same-polarity induction motor rotor structure, including a rotor shaft, wherein the outer surface of the rotor shaft is sequentially sleeved with a first rotor end cover, a first rotor core, a rotor additional ring, a second rotor core, and a second rotor end cover. The present invention adopts a segmented rotor structure. Compared with the traditional same-polarity induction motor rotor structure, a magnetic bridge structure exists between adjacent salient poles on the outer surface of the segmented rotor core. Under high-speed operation, the existence of the magnetic bridge structure can greatly reduce the rotor wind wear loss. In addition, if the segmented rotor core is formed by stacking silicon steel sheets, the rotor eddy current loss caused by harmonics can also be effectively reduced.

Provided is a control device and program capable of easily outputting the state of mechanical loss in an induction motor. A control device that controls an industrial machine having an induction motor includes: a power cutoff section that cuts off power supply to the induction motor; a speed acquisition section that acquires the rotational speed of the induction motor; an acceleration calculation section that calculates acceleration based on the acquired rotational speed; a moment of inertia acquisition section that acquires the moment of inertia of the main shaft of the induction motor; a mechanical loss calculation section that calculates the mechanical loss of the induction motor based on the acquired rotational speed, the calculated acceleration, and the acquired moment of inertia; and an output section that outputs the calculated mechanical loss.

A method for driving an induction motor comprising a rotor and a magnetic core comprising a magnetic inductance component is provided, which comprises, by a motor drive configured for interfacing with the induction motor: performing a measurement of a voltage at terminals of the motor at standstill for a voltage measurement period during initial demagnetization of the magnetic core of the motor from an initial magnetic flux of the magnetic core, wherein the voltage measurement period is shorter than a time period of complete demagnetization of the magnetic core from the initial magnetic flux, and wherein the measurement of the voltage for the voltage measurement period comprises a plurality of S voltage measurement data points (vi)1≤i≤S, S being a non-zero natural integer; determining a first magnetic flux estimate component based on the plurality of S voltage measurement data points (vi)1≤i≤S ; determining a second magnetic flux estimate component by performing an exponential regression algorithm on the plurality of S voltage measurement data points (vi)1≤i≤S; and determining an estimate of the initial magnetic flux based on the first magnetic flux estimate and the second magnetic flux estimate component.

This invention discloses a method and system for no-load voltage build-up and pre-synchronization grid connection control of an AC excitation system. The method includes: acquiring the amplitude and phase of the grid voltage in real time via a phase-locked loop when the speed of the doubly-fed induction motor reaches the synchronous speed range; detecting the rotor mechanical position and calculating the slip angle using an encoder; extracting the fundamental component and correcting the phase of the stator-side no-load voltage; setting a target value for the stator voltage based on grid voltage-oriented control and calculating the target rotor current; constructing an inner-loop control loop for the rotor current, calculating the feedforward decoupling term and performing phase compensation; superimposing an outer-loop control loop for the stator voltage, and correcting the rotor current through closed-loop adjustment to eliminate the deviation between the stator-side no-load voltage and the grid voltage; and closing the grid connection circuit breaker and switching the control mode when the preset synchronization conditions are met. The dual-closed-loop control structure achieves precise no-load voltage build-up and smooth pre-synchronization grid connection of the excitation system, improving the stability and reliability of the grid connection process.

The utility model provides a stator structure and a single-phase induction motor. The stator structure comprises a stator iron core, the stator iron core comprises at least two iron core units, stator tooth parts and yoke parts of the at least two iron core units are the same, the circumferential lengths of stator tooth boots are different, the at least two iron core units are sequentially arranged in the axial direction of the stator iron core to form a first iron core block and a second iron core block, and the first iron core block and the second iron core block are arranged in the same axial direction. The arrangement sequences of the iron core units of the first iron core blocks and the second iron core blocks are different, the first iron core blocks and the second iron core blocks are alternately arranged in the circumferential direction of the stator iron core, and inclined notches are formed in the stator notches formed by the stator tooth boots between the adjacent first iron core blocks and second iron core blocks. And segment differences are formed among different types of iron core units of the same iron core block along the axial direction. According to the stator structure, the influence of tooth harmonic waves can be weakened, so that the additional torque of the motor is reduced, the starting capability of the motor is effectively improved, and the vibration noise is low.

The present invention discloses a stator core calibration device for a conical rotor three-phase asynchronous motor and its usage method, which relates to the technical field of stator core production. It includes a working platform, on the top of which a vibration motor is fixedly installed. Above the vibration motor, there is a U-shaped housing. The bottom end of the U-shaped housing is connected to the top end of the working platform through four shock-absorbing springs. A vibration motor is installed at the bottom end of the U-shaped housing, and the execution end of the vibration motor is drivingly connected to a positioning rod. A through hole for the positioning rod to pass through is provided at the bottom end of the U-shaped housing, and the inner diameter of the through hole > the outer diameter of the positioning rod. A calibration rotor sleeved on the positioning rod is arranged inside the U-shaped housing, and the outer wall of the calibration rotor matches the inner wall of the stator core. A movable notch calibration mechanism is installed at the top end of the U-shaped housing, and the execution end of the notch calibration mechanism is used to insert into the notch of the stator iron core sheet, and cooperate with the vibration of the vibration motor to calibrate the notches of multiple stator iron core sheets.

The utility model discloses a permanent magnet motor driving device for a belt conveyor, which relates to the technical field of driving devices, solves the technical problems of high maintenance cost and high maintenance amount caused by the adoption of an asynchronous motor for driving in the prior art, and comprises a driving base, and a pair of driving device frames are fixedly mounted on the upper wall surface of the driving base. A main shaft is rotationally installed in the driving device frame, a barrel support is fixedly installed on the main shaft, the installation mode of assemblies is clear, the overall structure is simple, and manufacturing and installation are easy; the permanent magnet synchronous variable frequency motor is adopted as a driving part, high efficiency and high power factor are achieved, energy consumption can be saved, and operation cost is reduced. The serpentine spring coupling can effectively prevent impact, reduce vibration and change load, protect equipment and improve the stability and reliability of the system; the disc brake is installed so that operation of the transmission roller can be rapidly stopped, the safety of the system is improved, and the safety of equipment and personnel is protected.

The present invention relates to a hairpin wound around a stator and, more specifically, to a hairpin with improved ease of manufacture and assembly. In the hairpin and a method for manufacturing and assembling the hairpin according to the present invention, the hairpin includes at least two bending parts, and thus, when applied to an induction motor having a low number of poles, prevents the end height of a coil assembly comprising the hairpin from becoming excessively high, reduces manufacturing costs, and can ensure motor performance. Moreover, when a plurality of the hairpins are inserted into the stator, a portion of the overlapping parts of the hairpins is bent toward the outside of the center of the stator, thereby having the effect of making it easy for the plurality of hairpins to be inserted overlapped.