Control Techniques motor, German Control Techniques model, Control Techniques price

Control Techniques 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 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.

Control Techniques motor classification

Motor classification. (1) Large motors refer to motors with a frame center height greater than 630mm. (2) Medium-sized motors refer to motors with a frame center height between 355 and 630mm. (3) Small motors refer to motors with a frame center height of 80-315mm. Two Classification by motor speed: (1) Constant speed motors include ordinary squirrel-cage, special squirrel-cage (deep-bar, double-cage, high starting torque type) and wound-rotor types. (2) Speed-regulating motors are motors equipped with commutators. (3) Variable speed motors include pole-changing motors, single-winding multi-speed motors, special squirrel-cage motors and slip motors. Three Classification by mechanical characteristics: (1) Ordinary squirrel-cage asynchronous motors are suitable for small capacity applications with small slip variation and constant speed operation, such as blowers, centrifugal pumps, lathes and other applications with low starting torque and constant load. (2) Deep-bar squirrel-cage motors are suitable for medium capacity applications where the starting torque is slightly higher than that of ordinary squirrel-cage asynchronous motors. (3) Double-cage asynchronous motors are suitable for medium and large squirrel-cage rotor motors. They have a larger starting torque but a slightly smaller maximum torque. They are suitable for constant speed loads requiring high starting torque, such as conveyor belts, compressors, crushers, mixers, reciprocating pumps, etc. (4) Special double-cage asynchronous motors are made of high-impedance conductor materials. Characteristics include high starting torque, low maximum torque, and large slip, enabling speed regulation. Suitable for equipment such as punch presses and cutting machines. (5) Wound-rotor asynchronous motors are suitable for applications requiring high starting torque and low starting current, such as conveyor belts, compressors, rolling mills and other equipment. Four Classification by motor protection type: (1) Open-type motors have no special protection for rotating and live parts other than the necessary supporting structure. (2) Protected-type motors have necessary mechanical protection for rotating and live parts, but do not significantly hinder ventilation. According to the different protection structures of the ventilation openings, there are three types: mesh-covered, drip-proof, and splash-proof. Drip-proof differs from splash-proof; drip-proof prevents vertically falling solids or liquids from entering the motor interior, while splash-proof prevents liquids or solids from entering the motor interior from any direction within an angle of 1000 degrees from the vertical. (3) Enclosed motors have a housing structure that prevents free exchange of air between the inside and outside of the housing, but does not require complete sealing. (4) Waterproof motors have a housing structure that prevents water under certain pressure from entering the motor interior. (5) Watertight motors have a housing structure that prevents water from entering the motor interior when the motor is submerged in water. (6) Submersible motors can operate in water for long periods under specified water pressure. (7) Explosion-proof motors have a housing structure that prevents gas explosions inside the motor from propagating to the outside and causing explosions of flammable gases outside the motor. Five Classification by motor operating environment: ordinary type, damp-heat type, dry-heat type, marine type, chemical type, high-altitude type, and outdoor type.

Control Techniques motor applications

An Asynchronous Motor is an AC motor whose speed under load does not maintain a constant ratio with the frequency of the connected grid. It also changes with the magnitude of the load. The greater the load torque, the lower the rotor speed. Asynchronous motors include induction motors, doubly-fed asynchronous motors, and AC commutator motors. Induction motors are the most widely used; generally, induction motors can be referred to as asynchronous motors without causing misunderstanding or confusion. In ordinary asynchronous motors, the stator winding is connected to the AC grid, and the rotor winding does not need to be connected to another power source. Therefore, it has advantages such as simple structure, convenient manufacturing, use and maintenance, reliable operation, light weight, and low cost. Asynchronous motors have high operating efficiency and good working characteristics, operating at nearly constant speed from no-load to full-load, meeting the transmission requirements of most industrial and agricultural production machinery. Asynchronous motors are also easy to derive into various protection types to adapt to different environmental conditions. During operation, asynchronous motors must absorb reactive excitation power from the grid, worsening the grid's power factor. Therefore, synchronous motors are often used for driving high-power, low-speed mechanical equipment such as ball mills and compressors. Since the speed of an asynchronous motor has a certain slip relationship with its rotating magnetic field speed, its speed regulation performance is poor (except for AC commutator motors). For transportation machinery, rolling mills, large machine tools, dyeing and papermaking machinery, etc., which require a wide and smooth speed regulation range, using DC motors is more economical and convenient. However, with the development of high-power electronic devices and AC speed control systems, the speed regulation performance and economy of asynchronous motors suitable for wide speed regulation are comparable to those of DC motors. Asynchronous motors are mainly used as motors, with a power range from a few watts to tens of thousands of kilowatts. They are the most widely used motors in various sectors of the national economy and in people's daily lives, providing power for various mechanical equipment and household appliances. For example, machine tools, small and medium-sized steel rolling equipment, fans, water pumps, light industry machinery, metallurgical and mining machinery, etc., mostly use three-phase asynchronous motors (Asynchronous Motor) for drive; single-phase asynchronous motors are widely used in household appliances such as electric fans, washing machines, refrigerators, and air conditioners. Asynchronous motors can also serve as generators, used in wind power plants and small hydropower stations, etc.

Control Techniques motor excitation methods

Motor excitation method refers to the method of generating a magnetic field in rotating electrical machines. The excitation methods of DC motors are divided into four types: separately excited DC motor, shunt excited DC motor, series excited DC motor, and compound excited DC motor. A DC motor in which the field winding has no connection with the armature winding and is supplied by another DC power source is called a separately excited DC motor. Permanent magnet DC motors can also be regarded as separately excited or self-excited DC motors, generally directly referred to as permanent magnet excitation. In a shunt excited DC motor, the field winding is connected in parallel with the armature winding. As a shunt generator, the terminal voltage generated by the motor itself supplies the field winding; as a shunt motor, the field winding and the armature share the same power source, and its performance is the same as that of a separately excited DC motor. In a series excited DC motor, the field winding is connected in series with the armature winding, and then connected to the DC power source. The excitation current of this DC motor is the armature current. A compound excited DC motor has two field windings: shunt and series. If the magnetomotive force produced by the series winding is in the same direction as that produced by the shunt winding, it is called cumulative compound excitation. If the directions of the two magnetomotive forces are opposite, it is called differential compound excitation. DC motors with different excitation methods have different characteristics. Generally, the main excitation methods for DC motors are shunt, series, and compound; the main excitation methods for DC generators are separate, shunt, and compound.

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