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정승환(Seoung-Hwan Jung),홍순일(Soon-Ill Hong),홍정표(Jung-Pyo Hong) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
A novel control strategy for the induction motor drive, based on the field acceleration method, is presented. The torque is controlled through variations of the stater flux angular velocity. The stator flux is controlled by using a feed forward control scheme, with the stator flux reference vector adjusted so as to obtain the fixed rotor flux amplitude.
홍순일,홍정표,정승환,Hong, Soon-Ill,Hong, Jeng-Pyo,Jung, Seoung-Hwan 한국마린엔지니어링학회 2007 한국마린엔지니어링학회지 Vol.31 No.4
This paper presents a solution that an analytical model for an induction motor and the formula of regenerative power and instantaneous torque are derived. based on the spiral vector. The torque is controlled linearly through variations of the slip angular velocity, based on the field acceleration method (FAM). And also PWM inverter fed induction motor drives is schemed to be easily a regenerative drive. The voltage source inverter fed induction motor drives that regenerative power occurs with back current type is presented, to easily controlled the feedback power and to proper the adaption of energy shaving drives. The experimental tests verify the performance of the FAM, proving that food behavior of the drive is achieved in the transient and steady state operating condition, and are discussed to save the power that regenerative power is measured at the operating acceleration or deceleration of servo system.
홍정표(Jeng-Pyo Hong),정승환(Seoung-Hwan.Jung),원태현(Tae-Hyun Won),권순재(Soon-Jae Kwon) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
Ultrasonic welder joins with a horn and a booster for amplification of the mechanical displacement. This coupling generates other resonance points at a frequency range lower than the piezoelectric material's resonance frequency. Therefore, frequency variation range through PLL control was proposed in order to prevent reaction to these resonance points.