Digital Pole Control for Speed and Torque Variation in an Axial Flux Motor with Permanent Magnets

Abstract

The use of renewable energies in the transportation industry has prompted the development of higher power electric motors and intelligent electronic traction systems. However, the typical coupling between the two continues to be mechanical, which reduces its efficiency and useful life. On the other hand, permanent magnet axial flux motor configurations make it possible to dispense with mechanical couplings, due to their high torque at low speeds due to their direct application on the wheels of vehicles. In this work, the design of a digital pole commutation system is presented, applied to an axial flux motor with permanent magnets for speed and torque control at a constant speed. The performance of the system is evaluated with experimental measurements; proving the effectiveness of the design, obtaining torques of up to 1784 Nm without extra mechanical couplings and maximum speed regulation errors of 8.43%.

Design and Construction of a Multipole Electric Motor Using an Axial Flux Configuration

“…These consist of changing the connection of the number of stator poles that are interacting with the rotor poles; considering that the use of the stator coils is limited to the minimum in configuration number 1 (one coil per phase), and in configuration 6, the operation is carried out at the maximum mechanical power available, since all the coils (four coils) are used per phase [17][18][19]. The development of the control system is shown more extensive in [5], where the six different control configurations and their behavior are analyzed.…”

“…Section 2.5 mentions the type of control developed for this multipolar electric machine, where from each of the polar sections of the stator, the connection and disconnection arrangement are made to vary the number of poles without losing the delivered torque. A more complete description of the motor control is shown in [5].…”