Design, analysis, parameter evaluation and testing of a laboratory-fabricated brush-less DC motor prototype
- PDF / 5,287,935 Bytes
- 26 Pages / 595.276 x 790.866 pts Page_size
- 6 Downloads / 134 Views
Sådhanå (2020)45:247 https://doi.org/10.1007/s12046-020-01470-7
Sadhana(0123456789().,-volV)FT3](012345 6789().,-volV)
Design, analysis, parameter evaluation and testing of a laboratoryfabricated brush-less DC motor prototype PINAKI MUKHERJEE*
and MAINAK SENGUPTA
Department of Electrical Engineering, Indian Institute of Engineering Science and Technology, Shibpur 711103, India e-mail: [email protected]; [email protected] MS received 16 July 2019; revised 29 June 2020; accepted 15 July 2020 Abstract. This paper presents detailed steps and procedures for the design of a 4-pole, 0.75-hp, 1500-r.p.m. surface-mounted permanent magnet brush-less DC (SPM-BLDC) motor. The motor has been fabricated at the works of a local manufacturer. The parameters of the machine have been analytically evaluated and subsequently compared to the experimentally determined values. Its practical performance on load has been experimentally evaluated in the laboratory and verified against analytical predictions too. Low-cost M45 electrical steel laminations, as used for commercial induction motors (IMs), have been used from considerations of cost and availability. This also enables direct comparison of important parameters (e.g. torque density, power density and efficiency) between the fabricated prototype and commercially available fractional-hp 3-phase and 1-phase IMs of similar rating. This study is significant since electrical motor manufacturers need not change their stator stamping production line for BLDC motor vis-a-vis IM in case of mass production. Such an approach is hardly reported in the available technical literature. Analytical methods adopted include both conventional hand calculations and finite-element analysis using commercially available software package(s). Excellent agreements between analytical and experimental values uphold the correctness of the design process, precision of fabrication and accuracy of experimental investigations. Keywords. BLDC motor; surface-mounted PM; design; demagnetisation; FEM analysis; thermal analysis; d-, q-axis inductance; Hall sensor; parameter estimation; load testing.
1. Introduction Brush-less DC (BLDC) motor [1–4] has emerged as an attractive alternative to traditional brushed DC motors and induction motors (IMs) in various applications like home appliances, automobiles and industrial variable speed drive applications for reasons that are well known – the most important ones being high energy density and absence of brushed rotor contacts. BLDC motor is a special kind of permanent magnet AC (PMAC) motor [5] having trapezoidal induced emf waveform with quasi-square phase current waveform. It operates in self- synchronous mode with proper inverter control, primarily in the 120° conduction mode, utilising appropriate PWM strategies [6] with inherent need for rotor position information feedback [7]. The different performance indices of the BLDC motor like torque–speed, power–speed characteristics, efficiency, torque ripple, etc. depend upon various factors such as rotor ge
Data Loading...
