Capacitor-run Single-phase Induction Research Articles

A CASE STUDY ON ANALYSIS OF CAPACITOR FAILURE IN PERMANENT SPLIT CAPACITOR RUN SINGLE PHASE INDUCTION MOTOR IN LOW SLIP REGION

This paper presents a case study on capacitor failure analysis in Permanent-Split Capacitor-Run SinglePhase Induction Motor (PSCRSPIM) in low slip region. It emphasizes the motor performance in low slip region and detailed analysis carried out for Capacitor voltage and current variation with respect to slip. Motor Equivalent circuit parameters are extracted from dc test, no-load test and locked-rotor test. MATLAB simulations are carried out. Theoretical and experimental results are plotted. The premature failure of capacitor faced by PSCRSPIM users is answered at the end of the Paper. Contrary to the general concept that overloaded machine will fail; the paper is addressing the failure of lightly loaded machines.

Energy Saving Approach for an Electric Pump Using a Fuzzy Controller

This paper presents an energy-saving approach for electric pumps widely used in agriculture. A capacitor-run single-phase induction motor is used with a centrifugal pump. An appropriate energy-saving frequency and voltage calculation algorithm is proposed in this paper. The fuzzy controller is used to control the water flow rate of the electric pump. Moreover, the adaptive Tabu search algorithm is used to identify induction motor parameters. The experimental results from the energy-saving approach are compared with the valve control and V/f control in terms of input power and power factor. From the experimental results, the electric pump using the proposed energy-saving approach consumes minimum input power compared with other approaches. In addition, the energy-saving approach can provide a good power factor at any flow rate.

Performance Investigation of Single-Phase Capacitor Start -Capacitor Run Induction Motor Drive 12 3

The capacitor-start capacitor-run single-phase induction motors are analyzed by means of double-revolving field theory. This paper presents a practical approach for obtaining equivalent circuit parameters of a single-phase induction motor drive. The mathematical modelling of the machine is done by considering both the rotating fields. The input parameters of a single-phase capacitor-start, capacitor-run induction motor are investigated through simulation and experimental results under normal power frequency operation. The performance of the above single-phase induction motor is analyzed for different load conditions.

A novel technique to determine the required capacitance for a single phase induction motor by applying roundness algorithm

This research paper presents a novel technique to determine the required value of capacitor used in a capacitor-run single phase induction motor. Dynamic analysis of main winding and auxiliary winding currents are performed and the electromagnetic flux revolving in the stator-rotor air gap is studied. In capacitor-run single phase induction motors, the most suitable capacitor is one that produces an electromagnetic flux that has a uniform trajectory (distribution) along the air gap. The novel technique presented in this research paper is the application of roundness algorithm to determine the most uniform trajectory of electromagnetic flux produced by varying auxiliary winding capacitors. The value of capacitance thus found from the proposed technique is compared with the motor manufacturer recommended capacitance. The agreement of the comparison validates the usefulness of the proposed technique.

PWM Inverter Drive for Modified Single Phase Induction Motors

This paper starts to look at the single phase induction machine which is a large consumer of domestic power supply with the goal of improving its operation. The existing capacitor-run single phase induction motor exhibits a significant level of torque pulsations during starting time and at steady state. This situation gives rise to noise and vibration in the machine. As part of efforts to mitigate these problems, an open loop two phase inverter drive strategy was developed and implemented in MATLAB/Simulink to reduce undesirable pulsations. Simulation results clearly show the superiority of motor performance under the proposed strategy when compared to motor performance under nominal power supply. Torque pulsations are eliminated at steady state with the consequence of reduced noise and heat loss to the environment. The motor is observed to develop significantly higher starting torque and its reliability is significantly increased as the strategy eliminates the need for capacitors and centrifugal switch associated with these motors.

Parameter Estimation of Permanent-Split Capacitor-Run Single-Phase Induction Motor Using Computed Complex Voltage Ratio

Equivalent circuit parameters and performance variables of permanent-split capacitor-run single-phase induction motor can be obtained from dc test, no-load test, locked-rotor test, and using turns ratio as derived from the winding ratio test (the last one is carried out if the design data are not available). In this paper, turns ratio has been replaced by a computed complex voltage ratio, based on an assumption that single-phase motor for parameter transformation can be represented as an ideal transformer. The equations for this complex quantity have been derived that provide an alternative to winding ratio test, which otherwise requires the tedium of a physical test on the motor. The performance variables like input current, power factor, and power consumed by the motor, obtained by the proposed technique, have been compared with those obtained using the conventional techniques as well as with the experimental observations obtained on three fan motors of different ratings. It is observed that the proposed method gives performance variable values closer to the experimental observations in comparison to those obtained using the conventional methods.

등가회로법에 의한 커패시터 구동 단상 유도전동기의 특성해석

This paper proposes a straightforward method of analyzing the operation characteristics for the capacitor run single-phase induction motor from the traditional equivalent circuit based on the revolving field theory. The proposed method consists of five procedures as follows: mechanical loss segregation, iron loss segregation and calculation of the equivalent circuit parameters, recalculation of parameters of the main winding side, calculation of the auxiliary winding magnetizing reactance and effective turn ratio, and analyzing the operation characteristics for this motor. When the characteristics are analyzed, the segregated mechanical and iron losses are considered as a loss resistance across input terminals of the equivalent circuit for the analysis. The validity of the proposed method is verified from the comparison between the computed results and the experimental ones for the operation characteristics.

Scalable Platform Robust Reconfiguration Method with Sensitivity Analysis and Fuzzy Clustering

For improving the quick responses and instances quality in platform based product family design, a scalable platform reconfiguration method using sensitivity analysis and fuzzy clustering is proposed with robust design theory. The possible platform constants and scaling variables sets are divided by design variable sensitivity analysis firstly, during which multiple performances are aggregated by preference aggregation to ease the sensitivity for total product. Then the performance preference, robust deviation and constraint violation changes caused by constant sharing are clustered by fuzzy c-means algorithm (FCM) to reasonably plan the constant multiple platforms sharing strategy. A fuzzy percentage index is introduced in FCM to determine the optimal cluster number in fuzzy clustering. Finally the instances deviated from platform are optimized to set scaling variables. The efficiency and effectiveness of proposed method is illustrated by the optimization of scalable capacitor-run single-phase induction motor families, and the results are compared against previous work.

VARIABLE VOLTAGE - FREQUENCY CONTROL OF A SINGLE PHASE INDUCTION MOTOR DRIVEN BY SHEPWM INVERTER

VARIABLE VOLTAGE - FREQUENCY CONTROL OF A SINGLE PHASE INDUCTION MOTOR DRIVEN BY SHEPWM INVERTER

Energy efficient power electronic controller for a capacitor-run single-phase induction motor

At present the speed control of a capacitor-run single-phase induction motor is being achieved by using triac based voltage regulators. This paper proposes a new scheme; an electronic transformer acts as a voltage regulator. Performance comparison is made between these two schemes in this paper. It is found that the proposed scheme has superior operating and performance characteristics. Experimental results show that apart from improvement in performance with respect to power factor and total harmonic distortion an appreciable amount of energy saving is also obtained in the electronic transformer based scheme.

A methodology to support product platform optimization using multi-objective evolutionary algorithms

A critical step when designing a successful product family is to determine a cost-saving platform configuration along with an optimally distinct set of product variants that target different market segments. A multi-objective optimization-based platform design methodology (MOPDM) was presented to optimize the individual product performances with a feasible platform commonality level. The process and optimization model for scale-based product platform was constructed firstly, and then the MOPDM was carried out in two stages using the non-dominated sorting genetic algorithm II (NSGA-II). A mechanism based on fuzzy set theory was developed to extract one of the Pareto-optimal solutions as the best compromise one. During the first stage of MOPDM, each product in the family was optimized independently with NSGA-II. Those design variables that show small deviations were held constant to form the product platform. The scaling variables of each instance product were optimized in the second stage. The efficiency and effectiveness of proposed method is illustrated by optimizing a family of six capacitor-run single-phase induction motors, and the results are compared against previous work.

Optimization of Single-Phase Induction Motors— Part I: Maximum Energy Efficiency Control

This work investigates the problem of efficiency optimization in capacitor-run single-phase induction motors. The double-revolving-field concept is employed in the theoretical analysis and a relation between the main and auxiliary stator currents is derived that accomplishes optimal efficiency under constant torque operation. A triac-based drive with an optimal efficiency voltage controller is proposed. The controller is easily implemented since an experimental procedure is used for adjusting its parameters. Moreover, the proposed control scheme satisfies all of the prerequisites of simplicity, reliability, and cost-effectiveness that are imposed by the utilization of a single-phase motor. Several experimental results are presented to validate the effectiveness of the proposed efficiency optimization control method.

Optimization of Single-Phase Induction Motors—Part II: Magnetic and Torque Performance Under Optimal Control

The magnetic and torque performance of a capacitor-run single-phase induction motor operated at constant torque under the optimal efficiency control, as presented in Part I, is analyzed. The magnetic field analysis demonstrates that magnetic saturation is considerably decreased with optimal efficiency control. Although triac-based optimal voltage controller introduces voltage and current harmonics, torque pulsations and acoustic noise are reduced due to magnetic flux weakening. The reduction of torque pulsations and acoustic noise is considerable in the low torque region where significant energy savings are also achieved. Selected calculated and experimental results are presented to validate the theoretical considerations and the resulting improvements.

Analysis and Performance Evaluation of Triac-Voltage Controlled Capacitor Run Induction Motor

This article presents steady-state analysis and simulation of triac-voltage controlled capacitor run single-phase induction motor driving a domestic fan load. Two schemes of circuits, namely, line controlled and branch controlled configurations, suitable for speed control are considered and simulation results are presented. Also, the two schemes are compared in terms of motor efficiency, line current pollution, and input power factor, keeping motor speed as the independent variable. It is shown that branch controlled circuit is superior in performance compared to line controlled one. Analytical, simulation, and experimental results are presented.

New method for speed control of single phase induction motor with improved motor performance

In this paper, a new method of speed control for the single phase induction motor is introduced to overcome the disadvantages of the conventional methods. In this method, the magnitude of the main winding current and its angle are controlled to control the motor speed, as well as to increase the starting torque at all speed settings. In the meanwhile, the voltage applied to the auxiliary winding is kept constant at the rated value. The performance of a 1 hp capacitor run single phase induction motor is experimentally and theoretically investigated, using this method of speed control. The experimental rig is built in the laboratory and a complete set of test results is obtained. On the other hand, a mathematical model for the motor is developed and the motor performance is calculated. Good agreement between the experimental and theoretical results is obtained. These results show that the new method of speed control gives much higher starting torque. This enables the motor to start at low speed settings. Also, a great improvement in motor efficiency and power factor at all speeds is achieved.

An Interactive Software for the Analysis of Thermal Characteristics of Capacitor-Run Single-Phase Induction Motors

This paper reports on the development of a software package, in FORTRAN 90, for determination of thermal characteristics of a capacitor-run single-phase induction motor. The software can be used for (i) calculating the steady-state temperature of the body and any internal part of the motor structure, (ii) heating and cooling curves at no load, and (iii) transient thermal characteristics for surface and stator slot temperatures at different loading. For normal motor operation, the steady-state temperature rise can be used as a direct measure of loss rather than the small difference between input and output power. In the software, the design details of the motor have been used as the input data, and a mixed-parameter thermal model has been developed based on dimensional information and constant thermal coeffi cients. The thermal model developed by the authors has been tested with a 3.5-HP, 400-V, 50-Hz capacitor run totally enclosed fan cooled (TEFC) single-phase motor. Its performance has been found to be in conformity with experimental temperature data for the body and the conductors inside the slot of the motor, obtained by varying the load for different values of the run capacitance. A computer-aided data acquisition system has also been developed for the on-line temperature monitoring of the stator slot. The conductor temperature also has been estimated by resistance method.

New method for speed control of single phase induction motor with improved motor performance

In this paper, a new method of speed control for the single phase induction motor is introduced to overcome the disadvantages of the conventional methods. In this method, the magnitude of the main winding current and its angle are controlled to control the motor speed, as well as to increase the starting torque at all speed settings. In the meanwhile, the voltage applied to the auxiliary winding is kept constant at the rated value. The performance of a 1 hp capacitor run single phase induction motor is experimentally and theoretically investigated, using this method of speed control. The experimental rig is built in the laboratory and a complete set of test results is obtained. On the other hand, a mathematical model for the motor is developed and the motor performance is calculated. Good agreement between the experimental and theoretical results is obtained. These results show that the new method of speed control gives much higher starting torque. This enables the motor to start at low speed settings. Also, a great improvement in motor efficiency and power factor at all speeds is achieved.

An improved energy-saving scheme for capacitor-run induction motor

Conventionally, the speed of a capacitor run single-phase induction motor is controlled by using an AC voltage controller (generally a triac) between the supply voltage and the motor. This letter proposes a new scheme, in which the triac is inserted in series with the main winding, while the motor auxiliary winding remains directly connected across the supply voltage. The experimental results indicate the superiority of the new method suggested in this letter.

Optimal Operation of Certain Power Loads Fed From a Photovoltaic Generator (PVG)

In this paper, optimal operation of some power loads fed from PVG source is investigated. The optimal operation consists of fulfilling two objectives simultaneously. The first objective consists of matching the maximum power that can be generated by the PVG with the power absorbed by the load. The second objective consists of conditioning the current supplying the load when the latter is of AC nature. The first objective is performed by installing a maximum power point tracker between the PVG source and the power load. The tracker is a step-up converter controlled by Schmitt trigger controller. The second objective is done via the connection of an active power filter in parallel with the AC power load. The active power filter target is to take care of all unwanted current harmonics that may penetrate to the AC load circuitry. A second Schmitt trigger controller is also used to control the operation of the active power filter. The power loads considered in this study are of two types: (1) DC loads: pure resistive and DC motor; (2) AC load: capacitor run single-phase induction motor. The performance evaluation of all proposed configurations are tabulated via the use of EMTP computer program. The results obtained prove the satisfaction of both objectives of the investigation.

Harmonic losses of single-phase induction motors under nonsinusoidal voltages

Parameters of a capacitor-start, capacitor-run single-phase induction motor with closed or semi-closed rotor slots are measured and a model for the investigation of the performance of the machine in the frequency domain under the influence of harmonic voltages is presented. An algorithm, taking into account the nonlinear rotor leakage inductance, is established. This algorithm is applied to estimate the current in the time domain, and the harmonic losses at rated-load operation without and with run capacitors are calculated. Computational results are compared with those from experimentation and the differences between both are discussed.