LTN motor Germany LTN model LTN price

LTN motor is an AC motor that generates electromagnetic torque through the interaction between the rotating magnetic field in the air gap and the induced current in the rotor winding, thereby converting electrical energy into mechanical energy. Three-phase asynchronous motors are mainly used as motors to drive various production machinery, such as: fans, pumps, compressors, machine tools, light industry and mining machinery, threshers and crushers in agricultural production, processing machinery for agricultural and sideline products, etc. Simple structure, easy manufacturing, low price, reliable operation, sturdy and durable, high operating efficiency and suitable working characteristics.

LTN motor applications

One of the most typical applications of motors is the traction of maglev trains. Its advantages of high speed, comfort, safety, no pollution, no noise, no vibration, and energy saving are increasingly favored by people. The primary (stator group) is installed on the track, making the vehicle lighter, power supply more convenient, and technology simpler. The levitation coil generates electromagnetic attraction, pulling the vehicle from below towards the track and maintaining a certain vertical distance. The magnetic force generated by the guidance coil maintains a certain lateral distance between the vehicle and the track. All of this can be ensured by a set of high-precision electronic adjustment systems to keep the vehicle constantly oriented and levitated at 10～15mm and moving in a straight line. The power for the levitation and guidance systems as well as the onboard equipment is supplied by the levitation linear generator. In the case of superconducting levitation, the vehicle can be levitated to above 100mm. Application of motors in vertical lifting systems: As modern high-rise buildings become taller and underground mining goes deeper, the defects of traditional rope hoisting systems become increasingly obvious, and the mechanical strength of their hoisting steel ropes also has a limit range. The hoisting system using permanent magnet linear synchronous motors is a ropeless hoisting system, featuring unrestricted lifting height (depth) by equipment, fewer equipment units, less space occupation, simplified hoisting system, improved system efficiency, reduced construction costs, and saved electrical energy. Compared with steel rope hoisting systems, linear motor hoisting systems have another major advantage: they can achieve high-speed lifting that the latter cannot reach, shortening the lifting cycle and improving work efficiency.

LTN motor operating mode

Several ways for motors to obtain excitation current: 1, excitation method powered by DC generator. Generators with this excitation method have a dedicated DC generator, known as a DC exciter. The exciter is generally coaxial with the generator, and the generator's excitation winding obtains DC current from the exciter through slip rings mounted on the main shaft and fixed brushes. This excitation method has advantages such as independent excitation current, relatively reliable operation, and reduced self-consumption of electricity. It was the main excitation method for generators in the past few decades and has mature operational experience. The disadvantage is that the excitation regulation speed is slow and maintenance workload is large, so it is rarely used in units above 10MW. 2, excitation method powered by AC exciter. Some modern large-capacity generators use an AC exciter to provide excitation current. The AC exciter is also mounted on the generator's main shaft. Its output AC current is rectified and then supplied to the generator rotor for excitation. At this time, the generator's excitation method belongs to separate excitation, and since it uses a static rectifier device, it is also called separate static excitation. The AC sub-exciter provides the excitation current. The AC sub-exciter can be a permanent magnet measuring device or an AC generator with a self-excited constant voltage device. To improve the excitation regulation speed, the AC exciter usually adopts a medium-frequency generator of 100——200HZ, while the AC sub-exciter adopts a medium-frequency generator of 400——500HZ. The DC excitation winding and three-phase AC winding of this generator are both wound in the stator slots. The rotor has only teeth and slots without windings, resembling a gear. Therefore, it has no rotating contact parts such as brushes and slip rings, offering advantages like reliable operation, simple structure, and convenient manufacturing process. The disadvantages are higher noise and larger harmonic components of the AC electromotive force. 3, excitation method without exciter. In this excitation method, no dedicated exciter is set up. Instead, the excitation power is obtained from the generator itself, rectified, and then supplied to the generator itself for excitation, known as self-excited static excitation. Self-excited static excitation can be divided into self-shunt excitation and self-compound excitation. The self-shunt excitation method obtains excitation current through a rectifier transformer connected to the generator outlet, which is then rectified and supplied to the generator for excitation. This excitation method has advantages such as simple structure, fewer devices, cost savings, and less maintenance workload. The self-compound excitation method, in addition to having a rectifier transformer, also has a high-power current transformer connected in series in the generator stator circuit. The function of this transformer is to provide a larger excitation current to the generator in the event of a short circuit, compensating for the insufficient output of the rectifier transformer. This excitation method has two excitation power sources: the voltage source obtained through the rectifier transformer and the current source obtained through the series transformer.

LTN motor hot topics

Motor torque characteristics: To improve the torque characteristics of motors, many scholars and research institutions have made bold attempts and innovations in the structural design of permanent magnet synchronous motors, achieving many new advances. To resolve the contradiction between slot width and tooth width, transverse flux machine technology (transverse flux machine) was developed. The armature coils and slot-tooth structure are spatially perpendicular, and the main magnetic flux flows along the axial direction of the motor, improving the power density of the motor. A double-layer permanent magnet arrangement is adopted to increase the quadrature-axis conductance of the motor, thereby increasing the output torque and maximum power of the motor. The stator tooth shape and pole shape are changed to reduce torque ripple of the motor, etc. Field-weakening speed expansion capability: After adopting field-weakening control, the operating characteristics of permanent magnet synchronous motors are more suitable for the driving requirements of electric vehicles. Under the same power requirement, the inverter capacity is reduced, and the efficiency of the drive system is improved. Therefore, permanent magnet synchronous motors for electric vehicle drives universally adopt field-weakening speed expansion. For this purpose, research institutions at home and abroad have proposed various schemes, such as adopting a double stator structure, using different windings at different speeds to maximize the utilization of the permanent magnet field; adopting a composite rotor structure, adding reluctance segments to the rotor to control the direct-axis and quadrature-axis reactance parameters of the motor, thereby increasing the motor's speed expansion capability; and adopting deep slots in the stator to increase direct-axis leakage reactance to expand the motor's speed range. Motor control theory: Due to the nonlinearity and multivariable nature of permanent magnet synchronous motors, control is difficult and control algorithms are complex. Traditional vector control methods often fail to meet requirements. Therefore, some advanced control methods have been applied in permanent magnet synchronous motor speed control systems, including adaptive observers, model reference adaptive control, high-frequency signal injection, and intelligent control methods such as fuzzy control and genetic algorithms. These control methods do not rely on the mathematical model of the controlled object, have good adaptability and robustness, and possess unique advantages for strongly nonlinear systems like permanent magnet synchronous motors.

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