Abstract
In order to achieve improved performance and efficiency of domestic and industrial fan/pump applications using low-cost solutions, the synchronous reluctance motors (SynRMs) remains a better choice than induction motors (IMs) which are still widely used for such applications despite its low efficiency during low speed operation. However, due to the lack of self-start capability the SynRMs need external drive and speed control algorithm to properly operate, which increases the production cost. For the purpose of providing low cost solutions for the SynRMs speed control, this paper presents a stable, reliable and robust scalar control for SynRMs. This control strategy implements the maximum torque per ampere loop for high efficiency operation and online parameter estimation for robust performance. The proposed solution presented in this paper can be implemented using a low cost MCU in PWM inverter with lower carrier frequency, thereby making the low cost SynRM drive for fan/pump application feasible and practical.
Highlights
The induction motors (IMs), which are widely used for most electric powered machines, such as fans, pumps, compressors, and other industrial and domestic applications, are still the main choice of drive technology
SCALAR CONTROL OF SYNCHRONOUS MOTOR CONTROL METHODOLOGY To derive a related control algorithm, the synchronous reluctance motors (SynRMs) electric model is shown in Equation (1) and the mechanical model is shown in Equation (2)
In order to provide reliable and accurate parameters for scalar control, this paper proposed a modified online parameter estimation in γ δ-axis with details of the estimation rules
Summary
The induction motors (IMs), which are widely used for most electric powered machines, such as fans, pumps, compressors, and other industrial and domestic applications, are still the main choice of drive technology. The permanent magnetic synchronous motors (PMSMs) have the highest efficiency, it is highly dependent on rare-earth magnets Another choice is the synchronous reluctance motor (SynRM), which requires no magnets, has a simple structure, and can be implemented using highly dynamic control, which means SynRMs require highly precise tuning of the inverter to work properly, and have higher cost than the IMs solution. When the output voltage is well compensated by means of the reactive power method, efficiency and optimized reactive power control are optimized; reactive power calculation is highly dependent on precise motor inductance, which varies with respect to load current [3]. In order to address precise reactive power calculation, scalar control with an online inductance estimation is proposed in this paper to achieve robust control performance with dynamic load disturbance according to literatures [13]–[19]. The conclusions are given at the end of this paper
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