ATB motor Germany ATB model ATB price

ATB motor is a commonly used AC motor. The synchronous motor is the heart of the power system; it is a component that integrates rotation and stationary parts, electromagnetic changes and mechanical motion, to realize the conversion between electrical energy and mechanical energy. Its dynamic performance is very complex, and its dynamic performance has a great impact on the dynamic performance of the entire power system. The characteristic is: during steady-state operation, there is an invariant relationship between the rotor speed and the grid frequency: n=ns=60f/p, where f is the grid frequency, p is the number of pole pairs of the motor, and ns is called the synchronous speed. If the grid frequency remains unchanged, the speed of the synchronous motor is constant in steady state and independent of the load magnitude. Synchronous motors are divided into synchronous generators and synchronous motors. AC machines in modern power plants are mainly synchronous generators.

ATB motor structure

The motor mainly consists of a stator, a rotor, and bearings. The stator mainly consists of an iron core, three-phase windings, a frame, and end shields. The stator core is generally punched and stacked from silicon steel sheets with an insulating layer on the surface, with a thickness of 0.35~0.5 mm. Slots are uniformly distributed on the inner circle of the core for embedding the stator windings. The three-phase windings are formed by connecting three windings with identical structures, arranged symmetrically and separated by 120° electrical degrees in space. The coils of these windings are embedded in the stator slots according to certain rules. Their function is to generate a rotating magnetic field when supplied with three-phase AC current. The frame is usually made of cast iron; the frames of large asynchronous motors are generally welded from steel plates, and the frames of miniature motors are made of cast aluminum. Its function is to fix the stator core and front and rear end shields to support the rotor, and to provide protection and heat dissipation. The frame of enclosed motors has cooling fins on the outside to increase the heat dissipation area. The end shields of protected motors have ventilation holes at both ends to allow direct convection of air inside and outside the motor, facilitating heat dissipation. The end shields mainly serve to fix the rotor, provide support, and offer protection. The rotor mainly consists of an iron core and windings. The material used for the rotor core is the same as that of the stator, punched and stacked from silicon steel sheets 0.5 mm thick. Holes are uniformly distributed on the outer circle of the silicon steel sheets to accommodate the rotor windings. Usually, the inner circle of the silicon steel sheets remaining after punching the stator core is used to punch the rotor core. Generally, the rotor core of small asynchronous motors is directly press-fitted onto the shaft. For large and medium-sized asynchronous motors (rotor diameter above 300~400 mm), the rotor core is pressed onto the shaft with the help of a rotor spider. Rotor windings are divided into squirrel-cage rotors and wound rotors. (1) Squirrel-cage rotor: The rotor winding consists of multiple conductive bars inserted into the rotor slots and two ring-shaped end rings. If the rotor core is removed, the overall shape of the winding resembles a squirrel cage, hence the name cage winding. Small cage motors use cast aluminum rotor windings, while motors above 100KW use copper bars and copper end rings welded together. Squirrel-cage rotors are divided into several types: impedance type, single squirrel-cage type, double squirrel-cage type, and deep-bar type, each with different characteristics such as starting torque. (2) Wound rotor: The wound rotor winding is similar to the stator winding; it is also a symmetrical three-phase winding, generally connected in star configuration. The three output terminals are connected to three slip rings on the shaft, and then connected to the external circuit via brushes.

ATB motor classification

The motor has advantages such as simple structure, small size, high efficiency, and high power factor. Permanent magnet synchronous motors have achieved performance in medium and low-voltage motor applications in industries such as metallurgy (ironworks and sintering plants), ceramics (ball mills), rubber (internal mixers), petroleum (pumping units), and textiles (two-for-one twisters, ring spinning frames), and are gradually accumulating design and operational experience. Classified by permanent magnet structure: Surface-mounted Permanent Magnet Synchronous Motor (SPMSM), Interior Permanent Magnet Synchronous Motor (IPMSM). Classified by the waveform of the induced electromotive force in the stator winding: Sinusoidal Permanent Magnet Synchronous Motor, Brushless Permanent Magnet DC Motor. The starting current multiple of permanent magnet synchronous motors is about 9 times, which is 10% larger than that of asynchronous motors. Permanent magnet synchronous motors cannot use reduced-voltage starting methods. Because under reduced-voltage supply conditions, the decrease in asynchronous starting torque is greater than that of asynchronous motors, causing starting difficulties. Regarding the self-starting characteristics of permanent magnet synchronous motors and the feedback current during system short circuits, parameters vary significantly among different equipment manufacturers. Moreover, due to the difficulty in obtaining relevant data, the application of permanent magnet synchronous motors brings some uncertain factors to the short-circuit level and starting calculation verification of the plant power supply system.

ATB motor principle

The motor has two windings, namely the starting winding and the running winding. The two windings are spatially separated by 90 degrees. A capacitor with a large capacity is connected in series with the starting winding. When the running winding and the starting winding are supplied with single-phase AC current, the capacitor causes the current in the starting winding to lead the current in the running winding by 90 degrees in time, reaching the maximum value first. Two identical pulsating magnetic fields are formed in time and space, generating a rotating magnetic field in the air gap between the stator and the rotor. Under the action of the rotating magnetic field, an induced current is generated in the motor rotor. The interaction between the current and the rotating magnetic field produces electromagnetic torque, causing the motor to rotate.

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