A New V/f-Based Sensorless MTPA Control for IPMSM Drives

Abstract

Abstract-This paper presents a new closed-loop V/f control scheme for sensorless interior permanent-magnet synchronous motor (IPMSM) drives. The proposed control scheme combines the merits of conventional V/f and field-oriented control (FOC) strategies to achieve simple and high-performance motor drive. Two feedback stabilizing loops are designed to correct V/f voltage vector reference and improve overall system stability. The voltage vector phase angle reference can rapidly be corrected instead of using indirect frequency modulation, which makes it more robust against transient disturbances. In addition, a maximum torque per ampere (MTPA) plug-in block is implemented to optimize torque generation efficiency without intensive power or power factor angle calculations.The proposed scheme is ideal for applications which require good control performance over wide operating speed range. It also shows robustness to parameter variations caused by temperature increase or flux saturation. Theoretical analysis along with comparative simulation and experimental results are provided to validate the effectiveness of the proposed control scheme.

Sensorless-MTPA Control of Permanent Magnet Synchronous Motor Based on an Adaptive Sliding Mode Observer

“…where γ is the angle between the stator current vector and the positive direction of the q axis, named current angle and γMTPA is the current angle under the MTPA principle, which can be expressed as The MTPA points can be regarded as the solution of the optimal problem for the following formula [14]:…”

“…The key of achieving MTPA control for IPMSM is to obtain the accurate current angle [14]. According to (26), γ MTPA is a function of the permanent magnet flux linkage λ m and the motor inductance parameters L d , L q .…”

“…The key of MTPA control is to obtain the MTPA point. At present, the common methods mainly included formula calculation method [14], look-up table method [15], curve fitting method [16], search algorithm [17] and high-frequency signal injection method [18]. Among them, the formula calculation method with motor parameters is extensively used because of its simple process.…”

“…As can be seen from (18), the constructed Lyapunov function V satisfies conditions I and II, that is, the function V satisfies the sufficient conditions to determine the uniformly asymptotic stability of the nonlinear adaptive mechanism system. With (14) and (15) substituted into (18), the dV/dt can be obtained as…”

A unified theory for optimal feedforward torque control of anisotropic synchronous machines

“…Calleja, de Heredia, Gaztanaga, Nieva, & Aldasoro, 2016;Cavallaro et al, 2005;Lemmens et al, 2015;Preindl & Bolognani, 2013a;Preindl & Bolognani, 2013bTang, Li, Dusmez, & Akin, 2016, for PMSMs or Ahn et al, 2007;Foo & Zhang, 2016, for RSMs). This simplification will not be true in the most general case when the flux linkage is a nonlinear function of the currents (see e.g.…”