E.M.C motor Germany E.M.C model E.M.C price

E.M.C 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, then the speed of the synchronous motor is constant in steady state and independent of the load size. Synchronous motors are divided into synchronous generators and synchronous motors. AC machines in modern power plants are mainly synchronous generators.

E.M.C motor structure

The motor is mainly composed of stator, rotor, end caps and other components. The stator is made of laminated sheets to reduce iron losses generated during motor operation, and contains three-phase AC windings, called the armature. The rotor can be made in solid form or pressed from laminations, with permanent magnet materials mounted on it. According to the different positions of the permanent magnet material on the motor rotor, permanent magnet synchronous motors can be divided into two structural forms: surface-mounted and interior-mounted. Figure 1 shows the corresponding schematic diagrams. The magnetic circuit structure of the surface-mounted rotor is simple and the manufacturing cost is low, but since the starting winding cannot be installed on its surface, asynchronous starting cannot be achieved. The magnetic circuit structures of the interior-mounted rotor are mainly radial, tangential and hybrid, totaling 3 types. The main difference between them lies in the relationship between the magnetization direction of the permanent magnet and the rotation direction of the rotor. Figure 2 shows the magnetic circuit structures of 3 different forms of interior-mounted rotors. Since the permanent magnets are placed inside the rotor, the rotor surface can be made into pole shoes. Inserting copper bars or cast aluminum into the pole shoes serves the purpose of starting and damping, resulting in good steady-state and dynamic performance. Also, due to the asymmetry of the interior-mounted rotor magnetic circuit, reluctance torque is generated during operation, which helps to improve the power density and overload capacity of the motor itself, and such a structure is easier to achieve field weakening for speed expansion.

E.M.C motor protection

Motor coils are usually wound with very fine copper wire and have poor current carrying capacity. When the motor load is large or the motor is stalled, the current flowing through the coil increases rapidly, while the motor temperature rises sharply, making the copper winding extremely easy to burn out. If polymer PTC thermistors are connected in series in the motor coil, they will provide timely protection function when the motor is overloaded, avoiding motor burnout. Thermistors are usually placed near the coil, so that the thermistor is more sensitive to temperature, making the protection more rapid and effective. For primary protection, thermistors with higher voltage resistance ratings, such as KT250 type thermistors, are usually selected. For secondary protection, thermistors with lower voltage resistance ratings, such as KT60-B, KT30-B, KT16-B and chip-type motor thermistors, are usually selected.

E.M.C motor applications

Static index terms for motors: Number of phases: the number of excitation coil pairs that generate different pole pair N, S magnetic fields. Commonly represented by m. Step count: the number of pulses or conductive states required to complete one periodic change of the magnetic field, represented by n, or refers to the number of pulses required for the motor to rotate through one tooth pitch angle. Taking a four-phase motor as an example, the four-phase four-step operation mode is AB-BC-CD-DA-AB, and the four-phase eight-step operation mode is A-AB-B-BC-C-CD-D-DA-A. Step angle: corresponding to one pulse signal, the angular displacement of the motor rotor is represented by θ. θ=360 degrees (rotor teeth J * operating step count). Taking conventional two-phase and four-phase motors with 50 rotor teeth as an example. In four-step operation, the step angle is θ=360 degrees/(50*4) =1.8 degrees (commonly known as full step). In eight-step operation, the step angle is θ=360 degrees/(50*8) =0.9 degrees (commonly known as half step). Detent torque: the locking torque of the motor rotor itself when the motor is not powered (caused by harmonics of the magnetic field tooth shape and mechanical errors). Static torque: the locking torque of the motor shaft when the motor does not rotate under rated static electricity. This torque is the standard for measuring motor volume (geometric dimensions) and is independent of drive voltage and drive power supply. Although static torque is proportional to the electromagnetic excitation ampere-turns and related to the air gap between the stator teeth and the rotor, it is not advisable to excessively reduce the air gap and increase excitation ampere-turns to increase static torque, as this will cause motor heating and mechanical noise.

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