dietz-motoren motors Germany dietz-motoren models dietz-motoren prices

dietz-motoren motors are devices that place the rotor in a rotating magnetic field, where it obtains torque under the action of the field, causing the rotor to turn. The rotor is a rotatable conductor, typically squirrel-cage in shape. Invented by electrical engineer Nikola Tesla in 1887. The rotor is a rotatable conductor, typically squirrel-cage in shape. The stator is the non-rotating part of the motor, with the main task of generating a rotating magnetic field. The rotating magnetic field is not achieved by mechanical means. Instead, alternating current is applied to pairs of electromagnets, causing their magnetic pole properties to cycle, thus equivalent to a rotating magnetic field. Unlike DC motors, these motors do not have brushes or slip rings. Depending on the type of AC power used, there are single-phase and three-phase motors; single-phase motors are used in applications such as washing machines and electric fans, while three-phase motors serve as power equipment in factories.

dietz-motoren motor development history

Motor development history: By changing the positions of the stator and rotor in a permanent magnet DC motor, a permanent magnet brushless DC motor can be obtained. It should be noted that the term "DC" can be misleading, as it does not refer to a DC motor; in fact, it uses AC square wave power supply, so it is also called a permanent magnet brushless square wave motor. Its greatest advantage is being brushless, eliminating many problems caused by brushes. Moreover, the interaction between square wave current and square wave magnetic field can generate greater torque. The full name given by Professor Shen Dawei of Foshan Lighting is "permanent magnet brushless square wave torque motor." Replacing the excitation winding of traditional synchronous motors with permanent magnet materials eliminates traditional brushes, slip rings, and copper losses in the excitation winding. Due to the use of sinusoidal AC and a brushless structure, it is also called a permanent magnet brushless AC motor. Its advantages include high energy density and high efficiency, a wider speed range in the constant power region, and the ability to meet the high-performance requirements of electric vehicles through vector control methods. Asynchronous motors are characterized by simple structure, durability, low cost, reliable operation, low torque ripple, low noise, no need for position sensors, and high speed limits. Vector control speed regulation technology for asynchronous motors is relatively mature, giving asynchronous motor drive systems significant advantages, so they were applied earlier to electric vehicle drive systems and remain mainstream products (especially in the United States), but are gradually being replaced by other new types of brushless permanent magnet traction motor drive systems. The biggest disadvantage is complex drive circuits and high costs; compared to permanent magnet motors, asynchronous motors have lower efficiency and power density.

dietz-motoren motor applications

A most typical application of motors is traction for maglev trains. Their advantages of high speed, comfort, safety, pollution-free operation, noiselessness, vibration-free operation, and energy saving are increasingly favored. The primary (stator group) is installed on the track, making the vehicle lighter, power supply more convenient, and technology simpler. Suspension coils generate electromagnetic attraction, pulling the vehicle from below toward the track and maintaining a certain vertical distance. Guiding coils generate magnetic forces that maintain a certain lateral distance between the vehicle and the track. All this is ensured by a set of high-precision electronic adjustment systems, keeping the vehicle constantly oriented and levitating at 10～15mm while moving in a straight line. Power for the suspension and guidance systems as well as onboard equipment is supplied by the suspension linear generator. With superconducting suspension, the vehicle can levitate to above 100mm. Applications of motors in vertical lifting systems: As modern high-rise buildings become taller and underground mining goes deeper, the defects of traditional rope-based lifting systems become increasingly apparent, and the mechanical strength of lifting steel ropes has a limit. Lifting systems using permanent magnet linear synchronous motors are rope-less lifting systems, featuring unlimited lifting height (depth) by equipment, fewer equipment units, less space occupation, simplified lifting systems, improved system efficiency, reduced construction costs, and energy savings. Compared to steel rope lifting systems, linear motor lifting systems have another major advantage: they can achieve high-speed lifting unattainable by the latter, shortening the lifting cycle and improving work efficiency.

dietz-motoren motor starting

The armature circuit resistance and inductance of the motor are small, while the rotating body has a certain mechanical inertia. Therefore, when the motor is connected to the power supply, the armature speed and corresponding back EMF are very small at the beginning of starting, resulting in a large starting current. It can reach up to 15～20 times the rated current. This current causes disturbances to the grid, mechanical shocks to the unit, and sparking at the commutator. Therefore, direct switching starting is only suitable for motors with power not exceeding 4 kilowatts (starting current is 6～8 times the rated current). To limit the starting current, a specially designed variable resistor is often connected in series in the armature circuit; its principle wiring is shown in Figure 1. During the starting process, as the speed continuously increases, each segment of resistance is short-circuited step by step in time, keeping the starting current within a certain allowable value. This starting method is called series resistance starting, which is very simple, with lightweight equipment, and is widely used in various small and medium-sized DC motors. However, due to high energy consumption during the starting process, it is not suitable for motors that start frequently or for medium and large DC motors. But for certain special needs, such as urban trams which start frequently, series resistance starting is usually adopted to simplify equipment, reduce weight, and facilitate operation and maintenance. For larger capacity DC motors, reduced voltage starting is usually adopted. That is, a separate adjustable voltage DC power supply supplies power to the motor armature; controlling the power supply voltage allows smooth motor starting and speed regulation. This method requires more complex power supply equipment.

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