Rewinding of the Single Phase Induction Motor
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Abstract:
The efficiency of an single phase induction motor can reduce due to the age of the motor. Therefore, the old induction motor have a less efficiency compare to the new ones. Some methods can be apply to increase the efficiency of the old induction motor. In this research, one of the methods is applied in the small single-phase induction motor. This efficiency can be improve with reducing the losses of the induction motor. The low-power single-phase induction motors are repaired by manually rewinding. The results showed that the efficiency of low power single phase induction motors that was repaired with manually rewinding is increasing with average + 16.93% and ranges between +2.42% to +20.11%.Keywords:
Single phase
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고효율 유도전동기는 일반 유도전동기의 발생 손실을 절감시킨 것으로 적은 소비전력으로 에너지를 절약하고, 운전비용이 낮아서 단기간에 초기 설비투자 비용회수가 가능하고, 온도상승이 크지 않아 전동기 수명을 연장시킬 수 있다. 이에 포스코아에서는 이제까지의 경험을 바탕으로 전기 연구원과 협력하여 고효율 유도전동기 개발에 나섰다. 본 논문에서는 고효율 유도전동기 소형모터금형개발에 관하여 연구하였다. The high-efficiency induction motor reduces the generation loss of conventional induction motors and saves energy with less electricity consumed, enabling the return of initial facilities investments on a shorter-term basis due to its low operation cost and allowing the extension of the life of the motor. Poscore has entered the phase of development of high-efficiency induction motor based on its experiences to date in cooperation with electricity researchers. This paper examines the development of the small motor die for the high-efficiency induction motor.
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Single phase
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The pole-amplitude-modulation method of obtaining economic and efficient 2-speed and 3-speed operation of a normal 3-phase squirrel-cage induction motor with a single winding, developed by Rawcliffe and Fong, has been applied to the single-phase induction motor.The paper describes the theory and design methods, and presents experimental results obtained with a 3-speed 8/6/4-pole single-phase test motor. Performance of the motor at 6 poles and 4 poles is comparable with that of normal single-phase motors, while at 8 poles it is somewhat inferior. The winding is of a perfectly standard type. Ten terminals only are required for two speeds, and 12 terminals for three speeds, the control gear therefore being extremely simple.
Single phase
Squirrel-cage rotor
Universal motor
Electronic speed control
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Among various types of electric motor, selecting an induction motor for electric vehicle (EV) is still being discussed. Efficiency and weight of induction motor are two significant disadvantages compared to other motors. To solve these two concerns, this paper proposes a study to effectively improve induction motor efficiency and its power density. The stator winding of proposed three phase induction motor is rewound by decreasing number of turn and by increasing stator coil size. This proposed motor is suitable for EV driven by inverter in high speed operation which the rated power of this motor is approximately two times more than that of its original. As the results, the motor efficiency is improved since its total loss is slightly increased. In addition, as an increasing twice of rated motor power approximately with the same motor weight, the power density of the proposed motor is also enhanced. Three sizes of three-phase inductor motor including 0.75, 2.25, and 3.7 kW are tested to illustrate the proposed approach in this study.
Universal motor
Synchronous motor
Single-phase electric power
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Driving range
Three-phase
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Phase control
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Induction motor is one type of electric machine that is most often used. The use of induction motors starts from the needs of resident customers to large industries. However, the existence of an induction motor in the electric power system can interfere the power quality, especially large capacity induction motors. The cause of the disturbance is the starting current of the induction motor. Synchronous generator as power supply is also affected by the starting process. When the starting condition, the induction motor requires a lot of power to start its initial rotation. The moment of inertia in the induction motor increases the load starting torque. In addition, synchronous generators also have to produce greater power to meet the needs of starting an induction motor. This paper aims to analyze the effect of starting induction motor on the power quality of synchronous generator. In the test method using induction motor with capacity of 100 kW, 300 kW, 700 kW, and 1 MW. Each induction motor takes parameter data such as starting current, motor torque, motor speed, motor voltage, active power and reactive power consumption. Likewise with the disturbed quality of synchronous generator power, then the parameters that experience disturbances are taken such as current, voltage, power factor, active power and reactive power generated by synchronous generators. Furthermore, all the results of these experiments are compared between induction motors with different power capacities to the power quality of synchronous generators.
Synchronous motor
Wound rotor motor
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Although there was an extensive amount of research in the area of high efficiency control of induction motors, the equation of maximized efficiency has not been given. The relationship between the source frequency and the motor speed and the equation of efficiency have been derived when the efficiency is maximized for a given torque and speed, and then, they are verified using a single‐phase equivalent circuit considering iron loss resistance. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
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This paper is described Ramp control starter for Single Phase Induction Motor. At starting Single phase Induction Motor takes a huge current and a low power factor. Due to a large current motor adversely affect the windings and mechanical bearings. Hence we had to nullify this effect, a popular method is used which is called solid state switching starter of a single phase induction motor.
Starter
Motor soft starter
Single phase
Universal motor
Machine control
Wound rotor motor
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