Estimation of the main dimensions of the traction permanent magnet-assisted synchronous reluctance motor

Abstract

Goal. The goal of the research is to develop an algorithm for selecting the main dimensions of a traction permanent magnet-assisted synchronous reluctance motor. Methodology. A method for determining the main dimensions of the motor, which combines the analytical selection of stator parameters and numerical field calculations for the selection of rotor parameters. The need to check the mechanical strength of a rotor with permanent NdFeB magnets in flux barriers is shown. Results. The article proposes an algorithm for selecting the main dimensions of a traction permanent magnet-assisted synchronous reluctance motor, which combines analytical expressions for selecting stator parameters and numerical field calculations for selecting rotor parameters. It is determined that analytical methods for calculating the magnetic circuit need to be developed in order to reduce the time to select the main dimensions of the motor. Originality. For the first time the sizes of active parts of the permanent magnet-assisted synchronous reluctance motor with power of 180 kW for the drive of wheels of the trolleybus are defined. Practical significance. As a result of research the sizes of active parts, stator winding data and a design of a rotor of the electric motor are defined. The obtained results can be applied when creating an electric motor for a trolleybus.

Determining the effect of stator groove geometry in a traction synchronous reluctance motor with permanent magnets on the saw-shaped electromagnetic moment level

“…Therefore, maintaining energy indicators at a high level is necessary not only under a rated mode of operation but also under other operational regimes. According to the authors of work [6], such characteristics can be ensured by the permanent magnet-assisted synchronous reluctance motors (PMSynRM, PMA-SynRel). The analysis reported in [7] shows that the mass-dimensional and cost indicators of an engine of this type are comparable to the best induction ones.…”

“…The rated moment is 900 Nm at a phase current of 350 A. The main characteristics of which were found by the method [6]. The parameters of the motor stator are given in Table 1.…”

“…It has been shown that the motor's stator is typically made from rigid sections, which yields a high mechanical winding strength and the best conditions for its cooling [6]. The open grooves of the motor's stator in combination with an active clearly pole rotor predetermine the possibility of saw-shaped electromagnetic moments, which are considered in work [11].…”

“…The authors of [11] noted that almost insignificant moments, in terms of their magnitude, could produce a significant impact on the mechanical part of the drive. The reason for this may be those objective difficulties that are associated with the fact that the grooves of the stator for such windings are typically made open, which is dictated by the technology of laying the rigid sections of the winding [6].…”

“…The saw-shaped moment of the motor is due to the uneven distribution of the magnetic induction of the motor in the air gap because of the different magnetic permeability of the tooth and the groove of the stator. This is based on the results of calculations reported in [6,11], as well as a stepped form of distribution of the magneto-driving force of the stator winding [12].…”