Walther Flender motor Germany Walther Flender model Walther Flender price

Walther Flender motors are AC motors that generate electromagnetic torque through the interaction between the rotating magnetic field in the air gap and the induced current in the rotor windings, thereby converting electrical energy into mechanical energy. Three-phase asynchronous motors are mainly used as motors to drive various production machinery, such as fans, pumps, compressors, machine tools, light industrial and mining machinery, threshers and crushers in agricultural production, and processing machinery for agricultural products, etc. They feature simple structure, ease of manufacturing, low cost, reliable operation, durability, high operating efficiency, and suitable working characteristics.

Walther Flender motor structure

Motor rotor structure: The rotor is the rotating part of a three-phase asynchronous motor, consisting of the rotor core, rotor windings, shaft, and fan. The rotor core is also part of the motor's magnetic circuit, made of stacked silicon steel sheets with uniform slots punched on the outer circumference, and fixed to the shaft. The rotor windings are placed in the slots of the rotor core. Depending on the structure of the rotor windings, three-phase asynchronous motors can be divided into squirrel-cage and wound-rotor types. The rotor windings of squirrel-cage asynchronous motors are named for their resemblance to a squirrel cage; their structure consists of copper bars embedded in the slots as conductors, with the two ends of the copper bars welded together by short-circuit rings. Small and medium-sized squirrel-cage asynchronous motors use cheaper aluminum instead of copper, casting the rotor conductors, short-circuit rings, and fan into one piece to form a cast-aluminum squirrel-cage rotor. The core of a wound rotor is the same as that of a squirrel-cage rotor. The rotor windings are similar to the stator windings, made of insulated wires wound and embedded in the rotor slots according to a certain pattern to form a three-phase symmetrical winding. Usually, the ends of the three windings are connected together, and the starting ends are respectively connected to three mutually insulated copper slip rings fixed on the shaft, forming a star connection. The rotor windings are connected to an external three-phase rheostat through the slip rings and brushes above them, for motor starting and speed regulation within a small range. Squirrel-cage and wound-rotor three-phase asynchronous motors have the same working principle; the only difference lies in the structure of the rotor windings.

Walther Flender motor speed control

The motor inverter is a low-voltage inverter. The input side uses a transformer to step down high voltage to low voltage, replacing the high-voltage motor with a special low-voltage motor. Motor voltage levels vary widely, with no unified standard. This approach, using low-voltage inverters with relatively small capacity, generates significant harmonics on the grid side. While 12 pulse rectification can be used to reduce harmonics, it does not meet strict harmonic requirements. When the inverter fails, the motor cannot be switched to run on the industrial frequency grid, which poses problems in applications where downtime is not permitted. Additionally, both the motor and cables must be replaced, resulting in a large amount of work. Feeding part of the asynchronous motor's rotor energy back to the grid to change the rotor slip for speed control adopts thyristor technology and requires wound-rotor asynchronous motors. However, since industrial sites now almost exclusively use squirrel-cage asynchronous motors, replacing the motor is very troublesome. The speed control range of this method is generally around 70%-95%, which is narrow. Thyristor technology easily causes harmonic pollution to the grid; as the speed decreases, the power factor on the grid side also drops, requiring compensation measures. Its advantage is that the converter part has a smaller capacity, making it slightly lower in cost than other high-voltage AC variable frequency speed control technologies. A variation of this speed control method is the internal feedback speed control system, which eliminates the transformer in the inverter part by integrating the feedback winding directly into the stator winding. This approach requires replacing the motor, and its performance in other aspects is close to cascade speed control.

Walther Flender motor advantages

What are the advantages of this motor compared to other motors? 1. Precision: Achieves closed-loop control of position, speed, and torque; overcomes the step loss problem of stepper motors; 2. Speed: Good high-speed performance, with general rated speeds reaching 2000～3000 rpm; 3. Adaptability: Strong overload resistance, capable of bearing loads three times the rated torque, especially suitable for occasions with instantaneous load fluctuations and requirements for rapid starting; 4. Stability: Smooth low-speed operation, without the stepping phenomenon similar to stepper motors during low-speed operation. Suitable for occasions requiring high-speed response; 5. Responsiveness: Short dynamic response time for motor acceleration and deceleration, generally within tens of milliseconds; 6. Comfort: Significantly reduced heat generation and noise. Simply put: ordinary motors seen in daily life continue to rotate for a while due to inertia after power is cut off, then stop. Servo motors and stepper motors stop and start immediately, with extremely fast response. However, stepper motors suffer from step loss. The application fields of servo motors are extensive. Generally, any application requiring a power source and precision may involve servo motors, such as machine tools, printing equipment, packaging equipment, textile equipment, laser processing equipment, robots, and automated production lines, which have relatively high requirements for process precision, processing efficiency, and operational reliability.

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