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RISS 인기검색어
- 검색키워드
- 주제어 : DC초퍼 (검색결과 5 건)
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전동차에 사용되는 DC초퍼 제어에 의한 회생제동에 관한 연구
이현화 朝鮮大學校 産業大學院 1989 국내석사
The generative braking system of the traction motors has been used, but the Regenerative braking system is used by developing the DC chopper. The improved circuit is applied in order to use the regenerative braking system widely. In this paper, the utilization of regenerative braking system was obtained the effect of reduction of unnecessary electric power loss and the linear speed control characteristics.
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DC초퍼를 이용한 단상유도전동기의 속도제어에 관한 연구
The common strategy of speed control of single-phase induction motors depends mainly upon controlling the applied voltage on the motor. Changing the applied voltage on the motor can be effected by several techniques. Some on these techniques employ auto-transformers or add extra winding, as required, to the main or auxiliary winding. The other approaches use power electronic devise such as TRIAC. Each one of these methods have advantage and disadvantage. Single-phase induction motors are always small and are seldom built in sizes over fractional horsepower ratings. Existing frequency control devices offer a wide range of speed control but are considered expensive with respect to these small motors. A new concept would be to control the input supply frequency to a single-phase induction motor by a single controlled forced commutated device. This approach is the intent of this paper. The paper presents a new drive for single-phase induction motor. This drive employs a bridge rectifier connected with the stator in a non-conventional fashion. The speed of the single-phase induction motor is controlled by controlling the chopping frequency of the chopper switch. The attractive feature of the drive is that it effects both frequency and dc chopping simultaneously. The drive performance has received both theoretical and experimental investigation.
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DC 초퍼를 이용한 유니버셜모터의 고조파특성에 관한 연구
A universal motor is a small DC series motor that is designed to operate from an AC supply. The characteristics of universal motors are high no-load speed and high starting torque. The universal motors can be implied AC or DC voltage source, although AC excitation is by far more common. Phase-angle controled AC drives system gained a high popularity due to their simple implementation despite the disadvantage of their poor input power factor especially for large values of phase delay angle. But phase angle control systems make much amount of harmonic current and which is damage to the other electrical instruments. DC chopper systems are able to eliminate the harmonic current and improve the power factor. This paper presents the harmonic characteristics of phase angle control AC system that is controlled TCA 785 with zero voltage crossing similarly to traditional system and DC chopper system that is used micro controller PWM IC.
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