R.VASSAL motor Germany R.VASSAL model R.VASSAL price

The R.VASSAL motor is named for its armature winding and field winding connected in series. Single-phase series-wound motors are AC/DC universal motors; they can operate on either AC or DC power supplies. The single-phase series-wound motor is widely used. Its advantages include high speed, high starting torque, compact size, light weight, resistance to stalling, and a wide applicable voltage range. Speed control can be achieved simply and easily by voltage adjustment.

R.VASSAL motor development trends

Motor development trends: Since the emergence of switched reluctance motor drive systems in the 20th century, 80s, traditional motor design theory and sinusoidal voltage source supply methods have been broken. With the development of reluctance motors, permanent magnet motors, power electronics technology, and computer technology, AC motor drive system design has entered a new golden age. New motor topologies and control methods continue to emerge, 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 convenient four-quadrant control. These characteristics make the SRD switched reluctance motor drive system well-suited for various operating conditions of electric vehicles, making it a highly promising candidate for electric vehicles. The major characteristics of SRD are large torque ripple and high noise. In addition, compared with 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, or ring-type transverse magnetic field structures. This motor superimposes permanent magnet torque on reluctance torque; the presence of permanent magnet torque helps increase motor power density and reduce torque ripple, facilitating its application in electric vehicle drive systems. The concept of the rotor pole-split hybrid excitation structure synchronous motor has attracted great attention from the international electrical engineering community and R&D centers of major automotive companies since its proposal. The rotor pole-split hybrid excitation structure synchronous motor has magnetic field control capability, similar to the low-speed field strengthening 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 an exploratory stage; 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.

R.VASSAL motor phase angle and torque

The motor phase difference angle (torque angle) is the phase difference δ between the no-load induced electromotive force generated by the magnetic field and the armature voltage. The torque of a synchronous motor is proportional to sin (δ) and reaches the theoretical xxx torque at δ = 90 degrees (for cylindrical motors; it differs for salient-pole motors). Furthermore, since the motor rotates synchronously with the frequency of the armature voltage, the output is proportional to the torque. If the load torque is too high, the motor stops due to "out-of-step" (loss of synchronism). The torque at this point is called the "pull-out torque," and it serves as the phase difference angle within the range of 50-70 degrees.

R.VASSAL motor control principle

Regarding the motor control principle, the control unit must first determine the sequence for turning on the power transistors in the inverter based on the rotor position sensed by the hall-sensor, according to the stator windings. This involves the AH, BH, CH (known as upper-arm power transistors) and AL, BL, CL (known as lower-arm power transistors) in the inverter. Current flows sequentially through the motor coils to generate a forward (or reverse) rotating magnetic field, which interacts with the rotor magnets, causing the motor to rotate clockwise or counterclockwise. When the motor rotor turns to a position where the hall-sensor senses another set of signals, the control unit turns on the next group of power transistors. By repeating this cycle, the motor continues to rotate in the same direction until the control unit decides to stop the rotor by turning off the power transistors. To reverse the rotor, the switching sequence of the power transistors is reversed. Basically, the switching of power transistors can be exemplified as follows: AH and BL pair → AH and CL pair → BH and CL pair → BH and AL pair → CH and AL pair → CH and BL pair. However, AH and AL, or BH and BL, or CH and CL must never be turned on simultaneously.

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