PFAFF motor Germany PFAFF model PFAFF price

PFAFF motors are a type of motor that changes the motor speed by altering the number of magnetic pole pairs, voltage, current, frequency, and other methods to achieve higher performance. Due to their excellent performance, adjustable-speed motors have been widely used in industrial sectors such as steel, power stations, cables, chemicals, petroleum, cement, textiles, printing and dyeing, papermaking, and machinery for stepless speed control of load machinery with constant torque or decreasing torque. They are particularly suitable for driving loads such as pumps and fans with significant flow variations, achieving good energy-saving results.

PFAFF motor performance

Although the working principle of the motor is similar to that of a split-phase single-phase asynchronous motor, the former has a much larger rotor resistance than the latter. Therefore, compared with a standalone asynchronous motor, a servo motor has three distinct characteristics: 1, high starting torque. Due to the large rotor resistance, there is a clear difference compared to the torque characteristic curve of a standard asynchronous motor. It allows the critical slip ratio S0 > 1, which not only makes the torque characteristic (mechanical characteristic) closer to linear but also provides a larger starting torque. Therefore, when the stator receives a control voltage, the rotor rotates immediately, exhibiting fast starting and high sensitivity. 2, wide operating range. 3, no self-rotation phenomenon. For a normally operating servo motor, as soon as the control voltage is lost, the motor stops immediately. When the servo motor loses control voltage, it operates in a single-phase state. Due to the large rotor resistance, the two torque characteristics generated by the interaction of the two rotating magnetic fields rotating in opposite directions in the stator with the rotor (T1－S1, T2－S2 curves) and the resultant torque characteristic (T－S curve). The output power of an AC servo motor is generally 0.1-100W. When the power frequency is 50Hz, voltages include 36V, 110V, 220, 380V; when the power frequency is 400Hz, voltages include 20V, 26V, 36V, 115V, and others. AC servo motors run smoothly with low noise. However, the control characteristic is nonlinear, and due to the large rotor resistance, losses are high and efficiency is low. Therefore, compared to DC servo motors of the same capacity, they are larger in volume and heavier in weight, making them suitable only for small-power control systems of 0.5-100W.

PFAFF motor development trends

Motor development trends: Since the emergence of switched reluctance motor drive systems in the 20s of the 80th century, traditional motor design theories and sinusoidal voltage source power supply methods have been broken. With the development of reluctance motors, permanent magnet motors, power electronics technology, and computer technology, the design of AC motor drive systems has entered a new golden age. New motor topologies and control methods have emerged endlessly, leading to the rapid development of a new generation of mechatronic motor drive systems. The main features of the SRD switched reluctance motor drive system are a compact and robust motor structure suitable for high-speed operation, simple and low-cost drive circuits, reliable performance, high efficiency over a wide speed range, and easy implementation of four-quadrant control. These features make the SRD switched reluctance motor drive system well-suited for various operating conditions of electric vehicles, making it a highly potential candidate for electric vehicles. The biggest characteristic of SRD is large torque ripple and high noise. In addition, compared to permanent magnet motors, it has lower power density and efficiency. Another disadvantage is the need for position sensors, which increases structural complexity and reduces reliability. Therefore, sensorless SRD is also one of the future development trends. Permanent magnet switched reluctance motors, also known as doubly salient permanent magnet motors, can adopt cylindrical radial magnetic field structures, disc-type axial magnetic field structures, and ring-type transverse magnetic field structures. This motor superimposes permanent magnet torque on reluctance torque. The presence of permanent magnet torque helps improve the motor's power density and reduce torque ripple, facilitating its application in electric vehicle drive systems. The concept of rotor pole-segmented hybrid excitation structure synchronous motors has attracted great attention from the international electrical engineering community and R&D centers of major automobile companies since its proposal. Rotor pole-segmented hybrid excitation structure synchronous motors have magnetic field control capabilities, similar to the low-speed field-weakening control and high-speed field-weakening control of DC motors, meeting the requirements of electric vehicle traction motors for high torque at low speeds and constant power with wide speed regulation. Research on this motor is in the exploratory stage, and its mechanism and design theory require further in-depth study and improvement. As a traction motor for electric vehicles, it has strong potential competitive advantages.

PFAFF motor applications

A most typical application of the motor is traction for maglev trains. Its advantages, such as high speed, comfort, safety, no pollution, no noise, no vibration, and energy saving, are increasingly favored by people. The primary part (stator group) is installed on the track, making the vehicle lighter, power supply more convenient, and technology simpler. The levitation coils generate electromagnetic attraction, pulling the vehicle from below toward the track and maintaining a certain vertical distance. The magnetic force generated by the guidance coils maintains a certain lateral distance between the vehicle and the track. All of this is ensured by a set of high-precision electronic adjustment systems, keeping the vehicle constantly oriented and levitated at 10～15mm while moving in a straight line. The power for the levitation and guidance systems and onboard equipment is supplied by the levitation linear generator. In the case of superconducting levitation, the vehicle can be levitated to above 100mm. Application 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. The lifting system using permanent magnet linear synchronous motors is a rope-less lifting system, featuring unlimited lifting height (depth) by equipment, fewer equipment units, less space occupation, simplified lifting system, improved system efficiency, reduced construction costs, and energy savings. Compared to steel rope lifting systems, linear motor lifting systems have the additional major advantage of achieving high-speed lifting unattainable by the latter, shortening the lifting cycle and improving work efficiency.

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