Electrical equivalent circuit for modelling permanent magnet synchronous motors

Abstract

In permanent magnet synchronous motor (PMSM) models, only the stator part is given as an electrical circuit and mechanical equations are used for modelling the mechanical part of the machine. In this study, electrical equivalents of mechanical equations are also obtained and mechanical parameters of a PMSM are expressed as an electrical circuit element. In this way, an exact electrical equivalent circuit is proposed in which both the stator and the mechanical part can be modelled as an electrical circuit for the PMSMs dynamic model. Although PMSM model includes mechanical parameters and variables, the complete model is expressed only in electrical elements and variables. The proposed PMSM circuit was simulated for different load torques in the circuit simulation program. Simulation results show that the proposed circuit operates like a PMSM. Simulation results were verified by another method in the form of solution of the differential equations that constitute the mathematical model of PMSM. Due to the proposed circuit that enables the conversion of mechanical parameters into electrical parameters, PMSM can be modelled and simulated as an electrical circuit with completely electrical elements in a circuit simulation program.

New design and optimization of an in-wheel permanent magnet motor with tangentially magnetized magnets and unequal stator teeth

“…Over the last few years, various works focus on the optimal design and the evaluation of permanent magnet synchronous motors for drive applications [4,5]. Indeed, in [6], a multiobjective optimization design of an outer rotor permanent magnet hub motor for an electric vehicle is carried out.…”

Common Mode Current Estimation for Filter Design for Non-Ideal Back EMF of a PMSM

“…These conditions include hysteresis effects, saturation effects, and if the back EMF is assumed to be sinusoidal. Based on this, the equivalent circuit can be described by using ( 1) and ( 2), as it was shown in [8]. These equations are only meant for determining the operational parameters of the PMSM.…”

“…What often is not taken into account in the Electromagnetic Interference (EMI) modeling, as the motors are simplified to balanced passive circuits, is the Back Electromagnetic Force (EMF). This paper will therefore investigate the motor modeling, including different EMF modeling techniques [8], and their impact on the total EMI running along the cables. Which will therefore impact the filtering effort [9].…”

Simulation of Speed Control on a PMSM Using a PI Controller

“…So, like a synchronous motor, a permanent magnet synchronous motor (PMSM) has a sinusoidal induced Electromotive Force (EMF) and needs a sinusoidal current to generate a constant torque. The winding rotor of an induction or synchronous motor has a lower torque-to-inertia ratio and power density, according to recent study on the design of permanent magnet synchronous motors (PMSM) [9], [10].…”