Single-phase Squirrel-cage Induction Motors Research Articles

Experimental and Analytical Study of Single-Phase Squirrel-Cage Induction Motor Considering End-Ring Porosity Rate

Single-phase squirrel-cage induction motors are widely used in household and industrial electronics, because of their simplicity, low cost, and ruggedness. The cage rotor of the induction motor is produced using laminated electrical steel sheets subjected to die-casting processes with various manufacturing parameters. However, the die-casting process generates pores in the cage-rotor end-ring. These pores have a significant effect on the motor properties, which cannot be accurately analyzed. In this paper, squirrel-cage rotors with different porosities were prepared by varying the die-casting process. Then, the end-ring porosity was accurately analyzed using X-ray computed tomography. The inter-bar resistance of the squirrel-cage rotor was calculated from the end-ring porosity rate. Finite-element analysis (FEA) was used to predict the effects of porosity on the motor performance. Finally, the motor was tested, and the measurements were compared with the FEA-predicted results. The analytical and experimental results obtained for a 1.5 kW single-phase squirrel-cage induction motor were very similar, when the end-ring porosity was included in the analysis.

Design and implementation of two‐phase permanent magnet synchronous motor fed by a matrix converter

A direct matrix converter structure and a two-phase permanent magnet synchronous motor (PMSM) are designed to increase the system efficiency in low-power motor drive applications. The drive system with two-phase PMSM has been proposed instead of the single-phase squirrel cage induction motor, which has low efficiency. A constant AC single-phase power supply can be directly converted to frequency and amplitude-adjustable two-phase power supply by the proposed converter structure. However, the proposed converter cannot generate the sufficient voltage level for a standard commercial motor. For this reason, a new two-phase PMSM is designed to adapt the converter output voltage amplitude with the motor-rated voltage by using Infolytica/MotorSolve software. A novel switching algorithm has been developed and analysed to show output voltage-current waveforms of the converter with their harmonic spectrum. In addition, the converter is designed compactly to be mounted to the terminal box of the designed motor. Experimental results have been obtained for speed control of the motor by using vector control at different reference speeds.

Effective use of three-phase squirrel-cage induction motors in remote farms with single-phase power supply

Problems of effective use of three-phase squirrel-cage induction motors in remote farms with single-phase power supply are considered. Comparative diagrams of the cost, power, weight, and efficiency of three-phase and single-phase squirrel-cage induction motors are given.

Simulation of the electromechanical faults in a single-phase squirrel cage induction motor

This research investigates the electromechanical characteristics of a single-phase squirrel cage induction motor due to a broken rotor bar, static, and dynamic rotor eccentricity. Numerical analysis is performed by solving the nonlinear time-stepping finite-element equation coupled with the magnetic field equation, circuit equation, and mechanical equation of motion. This research presents the characteristic frequency of the rotor vibration generated by each fault condition. It shows that each fault source can be distinctively identified by observing the variation of the corresponding characteristic frequency of the rotor vibration, even in the existence of several fault sources together.

Methodology for on-line incipient fault detection in single-phase squirrel-cage induction motors using artificial neural networks

A novel approach for online detection of incipient faults in single-phase squirrel-cage induction motors through the use of artificial neural networks is presented. The online incipient fault detector is composed of two parts: (1) a disturbance and noise filter artificial neural network to filter out the transient measurements while retaining the steady-state measurements, and (2) a high-order incipient fault detection artificial neural network to detect incipient faults in single-phase squirrel-cage induction motors based on data collected from the motor. Simulation results show that neural networks yield satisfactory performance for online detection of incipient faults in single-phase squirrel-cage induction motors. The neural network fault detection methodology presented is not limited to single-phase squirrel-cage motors (used as a prototype), but can also be applied to many other types of rotating machines, with the appropriate modifications.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Modeling and measurement of airgap harmonics of single-phase induction motors

The air-gap harmonic frequencies of a single-phase squirrel-cage induction motor are studied analytically using the permeance method. This approach delivers detailed information about the air-gap harmonic frequencies, corresponding pole pairs, and the originating mechanisms, such as excitation, slotting, or saturation. In order to verify this analysis, experimental measurements are carried out on a 1/3-hp single-phase induction machine. The harmonic frequencies and nature of the field waveforms are studied under different operating conditions. Excellent correlation is found between theoretical and experimental results.

Switch reversal of single-phase induction motor

The possibility of reversing single-phase squirrel cage induction motors simply by reversing the supply voltage at the terminals of the motor with a reversing switch has been investigated through experiments performed by the author and was found feasible. A very strong reversing torque was produced by reversing the voltage when the stator magnetizing current was near its maximum peak value. The motor was found to stop and reverse within 10 to 12 cycles.

Possibility of Reversing Single-Phase Squirrel Cage Induction Motors by Reversing the Terminal Supply Voltage

The possibility of reversing single-phase squirrel-cage induction motors simply by reversing the supply voltage at the terminals of the motor with a reversing switch is examined in this paper. Experiments were performed by the author and reversal was found feasible. Some of the experimental results are shown here and the findings with the established two-reaction theory are explained.