NUM motor Germany NUM model NUM price

NUM 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.

NUM motor structure

The motor structure consists of two main parts: the stator and the rotor. The part that remains stationary during DC motor operation is called the stator. The main function of the stator is to generate a magnetic field, and it consists of the frame, main poles, commutating poles, end covers, bearings, and brush gear. The rotating part during operation is called the rotor. Its main function is to generate electromagnetic torque and induced electromotive force. It is the hub for energy conversion in DC motors, so it is often called the armature. It consists of the shaft, armature core, armature winding, commutator, and fan. The function of the main pole is to generate the air gap magnetic field. The main pole consists of two parts: the main pole core and the field winding. The core is generally made by stacking and riveting silicon steel laminations with a thickness of 0.5mm～1.5mm. It is divided into the pole body and the pole shoe. The part covered with the field winding is called the pole body, and the widened lower part is called the pole shoe. The pole shoe is wider than the pole body, which not only adjusts the distribution of the magnetic field in the air gap but also facilitates the fixing of the field winding. The field winding is wound with insulated copper wire and fitted onto the main pole core. The entire main pole is fixed to the frame with screws. The function of the commutating pole is to improve commutation and reduce commutation sparks that may occur between the brush and the commutator during motor operation. It is generally installed between two adjacent main poles and consists of the commutating pole core and the commutating pole winding. The commutating pole winding is wound with insulated wire and fitted onto the commutating pole core. The number of commutating poles is equal to the number of main poles. The outer shell of the motor stator is called the frame. The frame has two functions: first, it is used to fix the main poles, commutating poles, and end covers, and serves as the support and fixation for the entire motor; second, the frame itself is part of the magnetic circuit, forming the magnetic path between the poles. The part through which magnetic flux passes is called the yoke. To ensure sufficient mechanical strength and good magnetic conductivity, the frame is generally made of cast steel or welded steel plates. The brush gear is used to introduce or extract DC voltage and DC current. The brush gear consists of brushes, brush holders, brush rods, and brush rod seats. The brushes are placed in the brush holders and pressed by springs to ensure good sliding contact between the brushes and the commutator. The brush holders are fixed to the brush rods, which are mounted on a ring-shaped brush rod seat. They must be insulated from each other. The brush rod seat is mounted on the end cover or bearing inner cover. Its circumferential position can be adjusted and fixed after adjustment.

NUM motor principle

After symmetrical voltage is applied to the motor stator winding, a rotating air gap magnetic field is generated. The rotor winding conductors cut this magnetic field to produce induced electromotive force. Since the rotor winding is in a short-circuit state, a rotor current is generated. The interaction between the rotor current and the air gap magnetic field produces electromagnetic torque, thereby driving the rotor to rotate. The motor speed must be lower than the synchronous speed of the magnetic field, because only in this way can the rotor conductors induce electromotive force to generate rotor current and electromagnetic torque. Therefore, this motor is called an asynchronous motor, also known as an induction motor. The motor speed (rotor speed) is less than the speed of the rotating magnetic field, hence it is called an asynchronous motor. It is basically the same as an induction motor. s=（ns-n）/n, where s is the slip rate, ns is the magnetic field speed, and n is the rotor speed. There are many types of asynchronous motors, including explosion-proof three-phase asynchronous motors, ys series three-phase asynchronous motors, y, y2 series three-phase asynchronous motors, and YVP series variable frequency speed control motors, etc.

NUM motor classification

Motors are divided into three basic types: electromechanical, magnetoelectric, and linear. Electromechanical stepper motors consist of cores, coils, gear mechanisms, etc. When the solenoid coil is energized, it generates magnetic force, pushing its iron core to move. The output shaft rotates by an angle through the gear mechanism, and the output shaft is held in the new working position by an anti-rotation gear. When the coil is energized again, the shaft rotates by another angle, performing step-by-step motion in sequence. Magnetoelectric stepper motors have a simple structure, high reliability, low price, and wide application. They mainly include permanent magnet, variable reluctance, and hybrid types. The rotor has permanent magnet poles, generating an alternating polarity magnetic field in the air gap. The stator consists of four-phase windings. When phase A winding is energized, the rotor turns towards the magnetic field direction determined by that phase winding. When phase A is de-energized and phase B winding is energized, a new magnetic field direction is generated. At this time, the rotor rotates by an angle and aligns with the new magnetic field direction. The sequence of the energized phases determines the direction of rotor rotation. If the change in stator excitation is too fast, the rotor cannot keep up with the change in the stator magnetic field direction, and the rotor loses steps. Low starting frequency and operating frequency are disadvantages of permanent magnet stepper motors. However, permanent magnet stepper motors consume less power and have higher efficiency. In the early 80s of the 20th century, disc-type permanent magnet stepper motors with disc rotors appeared, bringing the step angle and operating frequency to the level of variable reluctance stepper motors.

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