Abstract
This paper presents an improved voltage flux-weakening strategy of a permanent magnet synchronous motor (PMSM) in a high-speed operation. The speed control performance using voltage flux-weakening control is not affected by the motor parameters, so it is used in various motors for high-speed operations. In general, the voltage flux-weakening control uses voltage references to generate a flux axis current reference. However, there may be errors between the voltage reference and the actual voltage flowing into the motor. This causes an error in the current reference generation and reduces the efficiency of the inverter and motor due to the use of more current. In this paper, the problems that can occur due to voltage errors were analyzed through theoretical approaches and simulations, and improved voltage flux-weakening control to resolve these problems was presented. This method’s advantage is that the error between the voltage reference and the voltage applied to the motor can be minimized, and the target speed can be reached with minimum current. As a result, it was possible to increase the energy efficiency by reducing the amount of current flowing through the motor. The effect of the improved voltage-based flux-weakening control method was verified through simulations and experiments. As a result, the voltage errors were reduced by approximately 2.16% compared to the general method. Moreover, the current used in the field-weakening control region was reduced by up to 27.17% under the same torque condition.
Highlights
Various policies are being established worldwide for sustainable production and consumption of energy to minimize the detrimental effects of fossil fuels; this involves reducing carbon emissions and using green energy [1,2]
Various studies have been conducted using permanent magnet synchronous motors (PMSMs), which have the advantages of high efficiency, high power density, and high reliability compared to other motors [8,9,10,11,12]
In the case of PMSMs, flux-weakening control, which reduces the magnitude of the effective magnetic flux in the air gap by generating a new magnetic flux in the direction opposite to that of the existing magnetic flux, is used to enable high-speed operation [15,16,17,18]
Summary
Various policies are being established worldwide for sustainable production and consumption of energy to minimize the detrimental effects of fossil fuels; this involves reducing carbon emissions and using green energy [1,2]. Motors used in propulsion systems must perform high-speed operations above the rated speed when necessary [13,14]. In the case of PMSMs, flux-weakening control, which reduces the magnitude of the effective magnetic flux in the air gap by generating a new magnetic flux in the direction opposite to that of the existing magnetic flux, is used to enable high-speed operation [15,16,17,18]. Various studies have been conducted on the high-speed operation of motors. A method was used to reduce the magnetic flux component current in inverse proportion to the rotor speed [19]. This method has a disadvantage in that the surplus voltage required for vector control is not enough
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