Kretzschmar motor Germany Kretzschmar model Kretzschmar price

Kretzschmar 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 electric 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 several pairs of electromagnets, causing their magnetic pole properties to cycle, thus equivalent to a rotating magnetic field. Unlike DC motors, this type of motor does not have brushes or slip rings. Depending on the type of AC 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.

Kretzschmar motor performance

Motor performance is closely related to its excitation method. Typically, there are 4 types of excitation methods for DC motors: separately excited DC motor, shunt-excited DC motor, series-excited DC motor, and compound-excited DC motor. Understand the characteristics of each of the 4 methods: 1. Separately excited DC motor: The field winding has no electrical connection with the armature; the excitation circuit is supplied by a separate DC source. Therefore, the excitation current is not affected by the armature terminal voltage or armature current. 2. Shunt-excited DC motor: The circuit is parallel, with current division; the voltage across the shunt winding is the same as the voltage across the armature. However, the field winding is wound with fine wire with many turns, resulting in high resistance, which keeps the excitation current low. 3. Series-excited DC motor: Current is in series, with voltage division; the field winding is connected in series with the armature, so the internal magnetic field of this motor changes significantly with changes in armature current. To prevent large losses and voltage drops in the field winding, lower resistance is better; therefore, series-excited DC motors are usually wound with thicker wire and have fewer turns. 4. Compound-excited DC motor: The motor's magnetic flux is generated by the excitation currents in two windings.

Kretzschmar 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. Note 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. Therefore, 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 disadvantages are complex drive circuits and high costs; compared to permanent magnet motors, asynchronous motors have lower efficiency and power density.

Kretzschmar motor speed control

The motor is essentially a servo motor, composed of a synchronous motor and a driver, and is a variable frequency speed control motor. The voltage-regulated brushless DC motor is a true brushless DC motor, consisting of a stator and a rotor. The stator consists of an iron core, with coils wound in a "forward-reverse-forward-reverse..." pattern, thereby generating a fixed magnetic field of the N-S group. The rotor consists of a cylindrical magnet (with a shaft in the middle) or an electromagnet with slip rings. This brushless DC motor can generate torque but cannot control direction. Regardless, this motor is a very significant invention. When used as a DC generator, this invention can produce DC current with continuous amplitude, thereby avoiding the use of filter capacitors. The rotor can be permanent magnet, brushed excitation, or brushless excitation. When used as a large motor, this motor generates self-inductance and requires protective devices.

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