Abstract
Interior permanent magnet synchronous motor (IPMSM) efficiency can be improved by using maximum torque per ampere control (MTPA). MTPA control utilizes both alignment and reluctance torques and usually requires information about the magnetization map of the electrical machine. This paper proposes an adaptive MTPA algorithm for sensorless control systems of IPMSM drives, which is applicable in industrial and commercial drives. This algorithm enhances conventional control schemes, where the output of the speed controller is the commanded stator current and the direct current is calculated using an MTPA equation; therefore, it can be easily implemented in the previously developed drives. The proposed algorithm does not use any motor parameters for the calculation of the MTPA trajectory, which is important for systems operating in changing environmental conditions, because motor inductances and flux linkage strongly depend on the stator current and the rotor temperature, respectively. The proposed algorithm continuously varies the current phase and in such a way it tries to minimize the magnitude of the stator current at the applied load torque. The main contribution of this paper is the development of a technique to overcome the main disadvantage of seeking algorithms–the necessity of a precision information about the rotor position. The proposed method was verified experimentally.
Highlights
Interior permanent magnet synchronous motors (IPMSM), compared with machines of other types, have higher torque to weight ratios, higher efficiency, output power per volume and mass per volume values, which make them attractive for use in compact drives, high-efficient drives, drives with high dynamics, etc
The AC servo amplifier and the inverter were connected to the PC, which was used to control the experiment and monitoring the data
This paper proposes the adaptive control algorithm capable of operating in sensorless drives
Summary
Interior permanent magnet synchronous motors (IPMSM), compared with machines of other types, have higher torque to weight ratios, higher efficiency, output power per volume and mass per volume values, which make them attractive for use in compact drives, high-efficient drives, drives with high dynamics, etc. The high price of rare-earth metals, which are necessary for producing strong magnets, restricts the popularity of permanent magnet (PM) motors. Over the past decade, the price of rare-earth magnets has decreased; the area usage of PM motors is widening. As a result, they attract more attention, and many researchers have investigated the control systems of these machines. The main feature of IPMSMs is their asymmetry along direct and quadrature axes, which creates reluctance torque. Permanent magnet synchronous machines (PMSM), which have equal direct and quadrature inductance and idle load conditions, demonstrate magnetic asymmetry at load; they may produce reluctance torque. Modern efficient control systems must consider these facts and utilize the reluctance torque of the PM motors by employing one of the maximum torque per ampere (MTPA) techniques
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