Maximum Torque per Voltage Flux-Weakening Strategy With Speed Limiter for PMSM Drives

Abstract

This paper presents an enhanced Flux Weakening (FW) control scheme for Permanent Magnet Synchronous Motors (PMSMs), focused on electric vehicle applications. The novelty of the proposed algorithm is the integration in a unified scheme of both the accelerator pedal as torque reference and the cruise speed limiter (CSL) as speed limit, without interfering between them until this limit is achieved. The dq-axis current references are calculated from the proposed algorithm by using a polar coordinate system and a per-unit system. The latter is based on the characteristic machine parameters which aim to ease and simplify the algorithm implementation. Moreover, it takes advantage of the smooth transition between the Low Back Electromotive Force (LBEF) zone and the FW zone thanks to a voltage loop which changes the current-vector angle. Another fundamental merit of the proposed scheme is its capacity to work in all the dq-plane throughout the Maximum Torque per Ampere (MTPA), Constant Torque (CT), Current and Voltage Limit (CVL), Maximum Torque per Voltage (MTPV) and Constant Speed (CS) strategies without switching the algorithm. Simulations and experimental results from a real exterior-rotor Interior Permanent Magnet Synchronous Motor (IPMSM) direct-drive emotorbike verify the effectiveness of the proposed method.

A Review about Flux-Weakening Operating Limits and Control Techniques for Synchronous Motor Drives

“…Feedback topologies are subdivided in two subcategories, depending on how the loop acts on the current references coming from the speed loop. In particular, it is possible to distinguish between solutions acting on the angle of the MTPA current references [47,48] and solutions acting on the d-current reference [49,50]. The control schemes are reported in Figure 10 whereas their operating principle is depicted in Figure 11.…”

On the Development and Experimental Validation of a Novel and Intuitive Interior Permanent Magnet Synchronous Motor Controller for Electric Vehicle Application

“…Meanwhile, Ref. [16] further elaborated that the phase angle should never exceed 450 or π 4 while [33,34] defined the i d * in the flux-weakening region as follows.…”

Sensorless control of marine permanent magnet synchronous propulsion motor based on adaptive extended Kalman filter

“…References (Zerdali, 2019;Özkurt and Zerdali, 2022) established an adaptive mechanism to compensate for the influence of the changing system noise covariance matrix on the observation performance. Reference (Deng et al, 2019;Miguel-Espinar et al, 2021) proposed a robust EKF algorithm, which makes adjustment rules for the ratio of estimation error to external interference under interference. The results show that this kind of method has stronger anti-interference performance than the unmodified EKF under disturbance.…”