nidec motor Germany nidec model nidec price

nidec motor is a device that converts electrical energy into mechanical energy. It uses energized coils (i.e., stator windings) to generate a rotating magnetic field that acts on the rotor (such as a squirrel-cage closed aluminum frame) to form electromagnetic rotational torque. Motors are classified into DC motors and AC motors according to the power supply used. Most motors in power systems are AC motors, which can be synchronous motors or asynchronous motors (the speed of the stator magnetic field and the rotational speed of the rotor do not remain synchronized). The motor mainly consists of a stator and a rotor. The direction of force-induced motion of current-carrying conductors in a magnetic field is related to the direction of the current and the direction of the magnetic flux lines (magnetic field direction). The working principle of the motor is that the magnetic field exerts force on the current, causing the motor to rotate.

nidec motor applications

Variable frequency speed control for motors has become the mainstream speed regulation solution and can be widely applied to stepless speed transmission in various industries. Especially with the increasingly wide application of variable frequency drives (VFDs) in the field of industrial control, the use of variable frequency motors has also become more widespread. It can be said that due to the superiority of variable frequency motors over ordinary motors in variable frequency control, wherever VFDs are used, we can easily see variable frequency motors. The social benefits of domestically produced high-voltage variable frequency devices are significant, mainly including energy saving, thereby conserving resources and reducing environmental pollution. They eliminate starting shocks to motors and impacts on the power grid, reduce failure rates of motors and equipment, and improve control precision and automation levels. The economic benefits of variable frequency speed control are also very significant. For pumps and fans, fluid flow rate is proportional to the first power of speed, torque is proportional to the square of speed, and power is proportional to the cube of speed. As speed decreases, motor power consumption drops by the cube, so the energy-saving effect of variable frequency speed control is very significant. If the flow rate drops from to , then the speed drops to , then the speed drops to , the head drops to , and the motor power consumption drops to , theoretically saving energy. If dampers or valves were originally used for regulation, a decrease in flow rate leads to an increase in head and a decrease in motor power; in this case, variable frequency speed control saves more energy than damper or valve regulation. In addition to energy saving and efficiency improvement, there are some indirect economic benefits for different loads, mainly including improved power factor, realization of soft start, reduction of electrical and mechanical damage to the motor caused by starting torque, and smooth, stable, and high-precision control.

nidec motor structure

The motor consists of two basic parts: a stationary stator and a rotating rotor. The rotor is installed inside the stator cavity and is supported on two end covers by bearings. To ensure that the rotor can rotate freely within the stator, there must be a gap between the stator and the rotor, called the air gap. The air gap of an electric motor is a very important parameter; its size and symmetry have a great impact on the performance of the motor. Figure 2 shows the components of a three-phase squirrel-cage asynchronous motor. The stator consists of three-phase stator windings, a stator core, and a frame. The three-phase stator windings are the circuit part of the asynchronous motor and play a very important role in its operation; they are the key component for converting electrical energy into mechanical energy. The structure of the three-phase stator windings is symmetrical, generally having six output terminals U1, U2, V1, V2, W1, W2, located in the junction box outside the frame. They are connected in star (Y) or delta (△) configuration as needed. The stator core is part of the magnetic circuit of the asynchronous motor. Since the main magnetic field rotates relative to the stator at synchronous speed, to reduce losses induced in the core, the core is made of stacked high-permeability silicon steel sheets with a thickness of 0.5mm. Both sides of the silicon steel sheets are coated with insulating varnish to reduce eddy current losses in the core. The frame, also known as the housing, mainly supports the stator core and also withstands the reaction forces generated during the entire motor load operation. Heat generated by internal losses during operation is also dissipated outward through the frame. Frames for medium and small motors are generally made of cast iron. For large motors, casting is inconvenient due to the large size, so welded steel plates are commonly used.

nidec motor classification

Motors are divided into two types: reluctance type and Sawyer type. The Sawyer linear stepper motor consists of a stationary part (called the reaction plate) and a moving part (called the mover). The reaction plate is made of soft magnetic material, with teeth and slots uniformly machined on it. The mover of the motor consists of permanent magnets and two magnetic poles with coils, A and B. The mover is supported by an air cushion to eliminate mechanical friction during movement, ensuring smooth motor operation and improving positioning accuracy. The maximum moving speed of this motor can reach 1.5 m/s, acceleration can reach 2g, and positioning accuracy can reach more than 20 micrometers. Two Sawyer linear stepper motors assembled perpendicular to each other constitute a planar motor. By supplying different combinations of control currents to the motors in the x direction and y direction (Figure 3), the motor can move along any geometric trajectory in the plane. Large automatic plotters are new devices that combine computers and planar motors. Planar motors can also be used in laser cutting systems, with control precision and resolution reaching tens of micrometers.

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