KREMP WETZLAR motor, German KREMP WETZLAR model, KREMP WETZLAR price

KREMP WETZLAR motors are a type of electric motor powered by simultaneously connecting to 380V three-phase AC current (with a phase difference of 120 degrees). Because the rotor of a three-phase asynchronous motor rotates in the same direction but at a different speed than the stator's rotating magnetic field, there is slip, hence the name three-phase asynchronous motor. The rotor speed of a three-phase asynchronous motor is lower than the speed of the rotating magnetic field. The rotor windings generate electromotive force and current due to relative motion with the magnetic field, and interact with the magnetic field to produce electromagnetic torque, achieving energy conversion.

KREMP WETZLAR motor structure

A single-phase motor is an electric motor that requires only a single-phase AC power supply. A single-phase asynchronous motor consists of a stator, rotor, bearings, housing, end caps, etc. The stator is composed of a frame and a core with windings. The core is made by stacking slotted silicon steel sheets. Two sets of main windings (also called running windings) and auxiliary windings (also called starting windings or secondary windings), spatially separated by 90 ° electrical degrees, are embedded in the slots. The main winding is connected to the AC power supply, and the auxiliary winding is connected in series with a centrifugal switch S, starting capacitor, running capacitor, etc., before being connected to the power supply. The rotor is a cage-type cast aluminum rotor, formed by casting aluminum into the slots of the stacked core and casting end rings together, short-circuiting the rotor bars to form a squirrel-cage type. Single-phase asynchronous motors are further classified into single-phase resistance-start asynchronous motors, single-phase capacitor-start asynchronous motors, single-phase capacitor-run asynchronous motors, and single-phase dual-value capacitor asynchronous motors.

KREMP WETZLAR motor structure

Motors are divided into two forms based on rotor structure: squirrel-cage (squirrel-cage asynchronous motor) and wound-rotor asynchronous motors. Asynchronous motors operating as motors are also called induction motors because their rotor winding current is induced. Asynchronous motors are the most widely used and highest-demand type among various motors. Approximately 90 % of electrically powered machinery in various countries are asynchronous motors, with small asynchronous motors accounting for more than 70 %. In the total load of the power system, asynchronous motors account for a significant proportion of electricity consumption. In China, the electricity consumption of asynchronous motors accounts for more than 60 % of the total load. An asynchronous motor is an AC motor whose speed under load is not constant relative to the connected grid frequency. An Induction motor is an asynchronous motor with only one set of windings connected to the power supply. Where it does not cause misunderstanding or confusion, an induction motor can generally be referred to as an asynchronous motor. The IEC standard states that the term "induction motor" is effectively used as a synonym for "asynchronous motor" in many countries, while some other countries use only the term "asynchronous motor" to represent both concepts.

KREMP WETZLAR motor advantages

The motor operates in a self-controlled manner, so it does not require additional starting windings on the rotor like synchronous motors under heavy-load start-up with variable frequency speed control, nor does it produce oscillation and step-out during sudden load changes. The permanent magnets in small and medium-capacity brushless DC motors mostly use rare-earth neodymium iron boron (Nd-Fe-B) materials with high magnetic energy product. Therefore, the volume of rare-earth permanent magnet brushless motors is reduced by one frame size compared to three-phase asynchronous motors of the same capacity. Research on variable frequency speed control for asynchronous motors over the past thirty years has ultimately been about finding methods to control asynchronous motor torque. Rare-earth permanent magnet brushless DC motors will surely show advantages in the speed control field due to their wide speed range, small size, high efficiency, and small steady-state speed error. Because brushless DC motors have the characteristics of DC brushed motors and are also frequency-changing devices, they are also known as DC variable frequency; the internationally common term is BLDC. The operating efficiency, low-speed torque, and speed accuracy of brushless DC motors are better than inverters using any control technology, making them worthy of industry attention. Products have been produced exceeding 55kW, and can be designed up to 400kW, meeting the industry's needs for energy saving and high-performance drives.

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