Overcoming Current Quantization Effects for Precise Current Control using Dithering Techniques
スポンサーリンク
概要
- 論文の詳細を見る
Accurate current signals are required for precise current control of AC motor drives. However, current measurement errors that involve metering error and quantization error are unavoidable because of the inaccuracy of current sensors and the quantizing feature of analog-to-digital converters in all digital motion control systems. The quantization error contains harmonic components that can induce torque ripple, thus deteriorating the control performance. Therefore, it is necessary to suppress the quantization effects. In this paper, two dithered systems, namely, the subtractively dithered system and nonsubtractively dithered system, are presented in order to remove the quantization-based harmonic components of the measured current signals by whitening the quantization error. Moreover, for ease of practical implementation, the design of dither signals is analyzed for nonsubtractively dithered system, considering cases where the metering error is uniform noise or Gaussian noise. It is shown that by applying the dither having a suitably chosen probability density function, the total measurement error can be rendered spectrally white. The effectiveness of the proposed methods is verified through simulations and experiments using a high-precision linear stage.
著者
-
Fujimoto Hiroshi
Department Of Applied Electronics Daido Institute Of Technology
-
Zhu Hongzhong
Department of Electrical Engineering, The University of Tokyo
関連論文
- XPS Studies of Bi-Sr-Ca-Cu-O Single Crystal and Ceramics Surfaces
- Angiosarcoma Arising in the Breast Following Breast-Conserving Surgery with Radiation for Breast Carcinoma
- Electron Beam Doping by Superdiffusion in Unirradiated Regions (X
- Ectopic Breast Tissue in Axillary Lymph Node
- Refractory Urolithiasis in Extracorporeal Shock Wave Lithotripsy
- X-Ray Photoelectron Spectroscopy Studies of 7 K-Phase Bi-System Single Crystals
- XPS Studies of 80 K-Phase Bi-Sr-Ca-Cu-O Single Crystals
- LEED-AES Observations of 7 K- and 80 K-phase Bi-Sr-Ca-Cu-O Single Crystals
- Typical Electron Beam Doping(Superdiffusion)of Impurity Atoms in Damage-Free Regions of Semiconductors by the Kick-Out Mechanism
- Dependence of the Photoacoustic Signal Intensity Spectra on Sintering Temperature for Ceramic CdS and CdS_gSe_
- Electron Beam Doping in Damageless Regions of Semiconductors by the Kick-Out Mechanism (Interstitialcy and Direct Interstitial Mechanism)
- Short-Span Seeking Control of Hard Disk Drives with Multirate Vibration Suppression Perfect Tracking Control
- High-Speed Atomic Force Microscope by Surface Topography Observer
- Vehicle Stability Control of Small Electric Vehicle on Snowy Road
- Development of a microfabricated device for low-voltage electropermeabilization of adherent cells(CELL AND TISSUE ENGINEERING)
- Overcoming Current Quantization Effects for Precise Current Control using Dithering Techniques
- Halogenation Using Quaternary Ammonium Polyhalides. XXXI. Halogenation of Thiophene Derivatives with Benzyltrimethylammonium Polyhalides.