Semi-active reaction force compensation for a linear motor motion stage

Nguyen, Duc-Canh; Ahn, Hyeong-Joon

doi:10.1007/s12541-016-0104-y

Cited by 8 publications

(3 citation statements)

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“…A passive, Active and semi-active RFCs (reaction force compensation) to reduce the system vibration have been studied only for a linear motor motion stage [8][9][10][11]. Although the passive RFC mechanism is compact and costeffective, the passive RFC does not allow in situ modification of the dynamic characteristic of the RFC system.…”

Section: Introductionmentioning

confidence: 99%

“…An active RFC mechanism using an additional coil can tune its dynamic characteristic and minimize the transmitted force against the motion profile variation [9]. In addition, a semiactive RFC can modify the damping of the RFC by adjusting the external resistor or open-close time ratio of an additional coil [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Comparison of simulation and experiment of induction motor without RTC under open-loop speed control Speed and acceleration profile for induction motorhave the relationship shown in Eq (10)…”

mentioning

confidence: 99%

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RTC (reaction torque compensated) induction motor and its open-loop control

Ahn

2019

JMST Adv.

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Rapid change of the rotating speed of an induction motor causes large reaction torque or excessive vibration of the system base. This paper proposes a passive reaction torque compensated (RTC) induction motor considering the dynamic characteristic of open-loop speed control with a variable frequency drive. RTC mechanism converts the reaction torque into the dissipative inertial energy of the rotary stator and the potential energy of the torsion spring torque so that a part of the reaction torque or the spring torque is transmitted to the system base. First, dynamic equation and simulation model for the RTC induction motor are introduced and verified with experiments. The acceleration response of an induction motor with variable speed drive is approximated as first-order ordinary differential equation. Then, the RTC mechanism such as spring and additional inertia are designed considering derived acceleration response or torque profile. Then, an experimental setup and its control system for the RTC induction motor are built. Finally, effectiveness of the RTC induction motor is verified comparing open-loop speed control of both RTC and conventional induction motor. Keywords Induction motor • Variable speed control • Reaction torque compensation (RTC) Abbreviations c m, c s, c b Damping of rotor, stator and system base d 0 Initial deflection of tension spring at balance position F Force caused by tension spring i rq, i sq q-component of rotor and stator current J m, J s, J b Inertia of rotor, stator and system base K Stiffness of tension spring k s, k b Stiffness of equivalent stator and system base springs L 0 Undeformed length of tension spring L m, L r Magnetizing and rotor inductance p Number of poles R Distance from center of motor to pin of attached spring R r Rotor resistance r Radius of the pins T e, T L Motor and load torque T ks Torque generated by spring between stator and base T Trans Transmitted torque to the system base γ m Rotor acceleration η m, τ m Motor constants λ rd d-component of rotor flux θ m, θ s, θ b Rotary angle of rotor, stator, system base ω Frequency ω d, ω m Rotating flux and rotor speed

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Section: Introductionmentioning

confidence: 99%