NORD motors, Germany NORD models, NORD prices

NORD motors are permanent magnet motors commutated or controlled by electronic circuits. Permanent magnet brushless motors come in two types: sine wave drive and square wave drive. Those with rectangular wave drive current are commonly called permanent magnet brushless DC motors, while those with sine wave drive current are commonly called permanent magnet AC servo motors. Based on sensor type, they can be classified into sensor-equipped motors and sensorless motors.

NORD motor principle

When symmetrical voltage is applied to the motor stator windings, a rotating air gap magnetic field is generated. The rotor winding conductors cut this magnetic field, inducing an electromotive force. Since the rotor windings are 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 then can the rotor conductors induce electromotive force, thereby generating 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.

NORD motor power supply variable frequency

Motor power supply: AC motors generally adopt a three-phase system, because three-phase AC motors have obvious advantages over single-phase motors in terms of performance indicators, raw material utilization, and price. Three-phase motors of the same power are smaller in volume, lighter in weight, and lower in price than single-phase motors. Three-phase motors have self-starting capability. Single-phase motors have no starting torque; to solve the starting problem, special measures must be taken. The torque of single-phase motors is pulsating, and the noise is relatively high, but the required power supply is simpler, making them very convenient for household use. Therefore, small household motors and instrument motors mostly adopt single-phase motors. Variable frequency drives (VFDs) are power transmission components that apply variable frequency technology and microelectronics technology to control AC motors by changing the frequency and amplitude of the motor's working power supply. Characteristics of AC motor speed control VFDs: ■ Low-frequency torque output 180%, good low-frequency operating characteristics, maximum output frequency 600Hz, capable of controlling high-speed motors, comprehensive detection and protection functions (overvoltage, undervoltage, overload), restart after instantaneous power failure, protection functions such as acceleration, deceleration, and stall prevention during operation, automatic identification function for motor dynamic parameters to ensure system stability and accuracy, fast response during high-speed stopping, rich and flexible input/output interfaces and control methods, strong universality

NORD motor structure

The basic structure of a motor consists of the stator, rotor, and other accessories. Function of the stator core: It is part of the motor's magnetic circuit and holds the stator windings. Function of the stator windings: They are the circuit part of the motor; when three-phase AC current is supplied, they generate a rotating magnetic field. Function of the frame: It fixes the stator core and front/rear end caps to support the rotor, and serves purposes such as protection and heat dissipation. Function of the rotor: It acts as part of the motor's magnetic circuit and holds the rotor windings in the core slots. Function of the rotor windings: They cut the stator's rotating magnetic field to generate induced electromotive force and current, forming electromagnetic torque that causes the motor to rotate. Characteristics: The structure is relatively complex, so wound-rotor motors are not as widely used as squirrel-cage motors. However, by inserting additional resistors and other components into the rotor winding circuit via slip rings and brushes, the starting, braking, and speed control performance of asynchronous motors can be improved. Therefore, they are used in equipment requiring smooth speed control within a certain range, such as cranes, elevators, and air compressors. Other accessories of three-phase asynchronous motors: 1, End caps: Support function. 2, Bearings: Connect rotating parts with stationary parts. 3, Bearing end caps: Protect bearings. 4, Fan: Cools the motor.

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