Multiparameter Analysis for Efficiency Improvement of Single‐Phase Capacitor Motor

Abstract

Single-phase motors are known for their small power ratings and their usage in various household appliances. Although they are not large electricity consumers, their widespread application contributes to the overall electricity consumption. In addition, standard IEC 60034-30-1:214 defines the efficiency levels for single- and three-phase motors and stipulates the increased electrical efficiency for the electrical motors. Therefore, this paper sets the parametric analysis of permanently split capacitor motor with five different design parameters that have impact on the efficiency of the motor. As an output from the parametric analysis, two different optimized motor models are obtained with increased efficiency. The impact of each parameter on motor efficiency—as well as on the other operating characteristics, like starting torque, overloading capacity, rated current, starting current, total losses, and power factor—is analyzed and adequate conclusions are derived. The obtained motor models are verified with Finite Element Method (FEM) for magnetic flux density distribution.

Effect of Rotor Bars Shape on the Single-Phase Induction Motors Performance: An Analysis toward Their Efficiency Improvement

“…For example, the R ESR of a run-capacitor of 4.5 uF at 50 Hz supply frequency is equal to 7.07 Ω. So, the capacitor losses (P cap ) are specified as per Equation (8).…”

“…Moreover, it covers a wide scope of products, as motors with rated output power from 0.12 up to 1000 kW and supply voltage from 50 V up to 1 kV are involved. According to the latest relevant European Union legislation, the efficiency of the three-phase medium-sized IMs (i.e., with output power in the range of 0.75-375 kW) must meet the IE3 ratings since January 2017 [8]. Very recently, i.e., since July 2021, the premium efficiency is also mandatory for the large-sized three-phase IMs (i.e., with rated output power in the range of 375-1000 kW), expanding even more the scope of motors.…”

A novel design methodology for the compliance of single phase induction motors with recent industrial premium efficiency standards

“…This standard covers a wide scope of general‐purpose electric motors and also includes the small SPIMs, whose output power ranges from 0.25 to 3.0 HP. The aforementioned standards are applicable since January 2017 4 and thus the efficiency ratings of the commercial SPIMs have to comply at least with the specifications of IE3 (premium efficiency) class from now on. The efficiency requirements have been substantially increased.…”