Rotor Slot Distance Effects on Output Parameters in Single Phase Induction Motors

Abstract

S ingle phase induction motors (SPIMs) nowadays are widely used in domestic and commercial areas because of cheap cost, simple structure, low noise and small dimensions etc. Split phase, start and run-capacitor single phase induction motors are well known SPIM motor types [1]. Although a lot of advantages have mentioned, a SPIM has some disadvantages. Its efficiency is low and starting performance is not so good to compare the other electrical machines types.The optimal design of an induction motor in terms of electromagnetic torque means starting and breakdown torques are higher value [2]. Many researchers have investigated to improve the starting torque and efficiency of a SPIM. Some of them have focused the influence of rotor slot geometry like rotor slot type, shape, skewing, number of rotor slot, slot opening and core material.Zhou Rui et al [3], have modeled two single phase induction motors with Maxwell 2D software and changed their dimensions in Maxwell 2D to find optimal slot geometry with respect to starting performance and efficiency. In similar studies; S. Sobhani et al [4] have examined dimensions of two SPIMs and mechanical

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

“…It can be seen that the cost of the SPIMs of Method-B is higher by 12.4% up to 15.63%. 6. When the Method-B is followed, the SPIMs present higher core losses by 13.3% up to 19.5%.…”

“…Next, the majority of the research works focused on the determination of the optimal configuration for the squirrel‐cage rotor. The rotor bars shape and their geometrical parameters have great effect on the motor's efficiency, power factor, and starting torque and thus this issue was discussed in detail in Reference 6. The final rotor topology of a commercial SPIM has to guarantee two contradictory requirements, that is, the motor's high efficiency during the nominal operation and its satisfactory behavior during the start‐up phase.…”

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

“…In this case, C f depends on the tip Reynolds number (R er ), which is provided in Equation ( 14). Now, the C f is estimated by using Equation (15). Finally, the capacitor-run SPIM's efficiency derives from Equation ( 16), where P n is the motor's nominal output power.…”

“…Therefore, the development of SPIMs with enhanced efficiency is a challenging task for both designers and manufacturers and is gathering growing research and industrial interest. In order to improve the SPIMs' efficiency, so far, research efforts have focused on (a) the introduction of more accurate magnetic and thermal models for the better estimation of the motor's electromagnetic and thermal behavior [13,14], (b) the optimal rotor squirrelcage design [15][16][17], (c) the proper selection of the rotor bars/stator slots combination for a given number of poles [18], (d) the utilization of manufacturing techniques such as the skewing and inclination of rotor bars [19], (e) the appropriate choice of run-capacitor features (i.e., its optimal value and placement) [20,21], (f) the proposal of novel topologies [22], (g) the testing of advanced electrical steels and conductive alloys for the motor's cores and squirrel-cage, respectively [23,24], and (h) the application of new casting methods [25]. Since most of the above solutions are not easily applicable to mass production, it is essential to have design approaches that provoke slight modifications of the existing SPIMs production procedure, and thus, they have a minimal impact on manufacturers.…”