The Key Technology of High Speed Asynchronous Motor Design

2021 ◽  
Keyword(s):  
High Speed ◽  
Asynchronous Motor ◽  
Key Technology ◽  
Motor Design

Motor design for a high-speed electrically-driven Gyroscope

1950 ◽  
Vol 69 (5) ◽  
pp. 446-450
Author(s):  
Gerard P. De Westfelt
Keyword(s):  
High Speed ◽  
Motor Design

scholarly journals High Speed Electrical Drives – Perspective of VFD Manufacturer

2020 ◽  
Vol 178 ◽  
pp. 01006
Author(s):  
Martin Bruha ◽  
Kai Pietiläinen ◽  
Axel Rauber
Keyword(s):  
High Speed ◽  
Technology Readiness ◽  
Power Electronic ◽  
Power Electronic Converters ◽  
Medium Voltage ◽  
Electrical Drives ◽  
Standard Design ◽  
Motor Design ◽  
High Level ◽  
Power Electronic Converter

This paper deals with high-speed electrical drives utilizing power electronic converters (commonly abbreviated as ASD, VFD or VSD). Existing solutions vary mainly on the motor side while the power electronic converter is very similar for all cases. Various advantages as well as technical challenges are discussed and illustrated. At certain stages comparisons between conventional and high-speed drives are made. The paper summarizes the experience of a VFD manufacturer based on state of the art technology in medium voltage and multi-megawatt power range. The authors believe that main complexity around high-speed drives is the motor design while the VFD requires only small adaptations or can sometimes be used directly without any modifications of standard design. The technology readiness is evaluated to be on a medium to high level.

Research on Precision Grinding System and Key Technology Based on PMAC-PC

2010 ◽  
Vol 97-101 ◽  
pp. 1942-1946 ◽  
Author(s):  
Ke Zhang ◽  
Yu Hou Wu
Keyword(s):  
High Speed ◽  
Thermal Characteristics ◽  
Numerical Control ◽  
Measurement Technology ◽  
Work Piece ◽  
Force Analysis ◽  
Precision Grinding ◽  
Motorized Spindle ◽  
Key Technology ◽  
Grinding System

A high speed experimental numerical control grinding system based on PMAC-PC was designed, realized machining and measurement integration. High speed motorized spindle finite elements dynamics and thermal characteristics, force analysis of linear motor feed element and parameters setting method based on PMAC, work piece roundness error measurement technology were researched. The grinding experiment and dynamic measurement indicated that the system possessed good following performance and stability; grind the elliptic work piece in the system.

Closed Loop Performance of a Slotless Lorentz Self-Bearing Motor

2003 ◽  
Author(s):  
Hooi-Mei Chin ◽  
L. Scott Stephens
Keyword(s):  
High Speed ◽  
Closed Loop ◽  
Coupling Effect ◽  
Cross Coupling ◽  
Motor Design ◽  
High Speed Rotation ◽  
Bearing Stiffness ◽  
Speed Rotation ◽  
Power Densities ◽  
Tangential Directions

In previous work the authors presented a Lorentz self-bearing motor design targeted for precision pointing and smooth angular slewing applications. The motor also offers potential advantages when operated as a synchronous machine at high speed including larger power densities and shorter shafts. In this paper, the closed loop performance of the motor at low transient speeds (0–588 rpm) is presented. Using these results, several challenges to achieving high-speed rotation are identified and discussed. The most significant is the heavy cross coupling within the actuator which limits bearing stiffness and stability, and is amplified at rotor natural frequencies resulting in potential loss of levitation when passing through critical speeds. Of particular interest is the discovery of a significant cross coupling effect between the radial and tangential directions. A theory is put forth explaining this effect.

The Research and Application of Auto-Focus Based on Hi3515

2012 ◽  
Vol 192 ◽  
pp. 440-444
Author(s):  
Yan Long Liu ◽  
Jian Jun Guo ◽  
Fu Mei Zhao
Keyword(s):  
Fourier Transform ◽  
Wavelet Transform ◽  
High Speed ◽  
The Other ◽  
Hill Climbing ◽  
Discrete Wavelet ◽  
Key Technology ◽  
Integer Dct ◽  
Auto Focus ◽  
Peak Value

Auto-focus is a key technology for visual presenter, this paper mainly presents how to achieve the function of auto-focus on Hi3515. The 4x4 integer DCT (Discrete Cosine Transform) shown as Eq. (2) was used to indicate whether the system was on accurate focus or not. Because the 4x4 integer DCT not only has the characteristics of single peak value, non-deflection, reliability, high-speed, but also has lower complex computation than the other frequency methods such as FFT(Fast Fourier Transform), DWT (Discrete Wavelet Transform). This paper employed the method of monotonic and blind hill climbing to achieve auto-focus. The result of auto-focus is shown as Fig. 6.

scholarly journals Vector Speed Regulation of an Asynchronous Motor Based on Improved First-Order Linear Active Disturbance Rejection Technology

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2168 ◽  
Author(s):  
Xuesong Zhou ◽  
Chenglong Wang ◽  
Youjie Ma
Keyword(s):  
Induction Motor ◽  
Disturbance Rejection ◽  
High Speed ◽  
Low Cost ◽  
Asynchronous Motor ◽  
State Variables ◽  
Control Effect ◽  
Speed Regulation ◽  
Active Disturbance Rejection ◽  
Static Performance

Asynchronous motors are widely used in industry and agriculture because of their simple structure, low cost, and easy maintenance. However, due to the coupling and uncertain factors of the actual operation of the motor, a traditional controller cannot achieve a satisfactory control effect. A linear active disturbance rejection controller (LADRC), featuring good robustness and adaptability, was proposed to improve the control efficiency of a nonlinear, uncertain plant. A linear extended state observer (LESO) is the core part of a L. The accuracy of the observation of state variables and unknown disturbances is related to the control effect of the controller. The performance of a traditional LESO is not high enough, and thus an error differential is introduced by analyzing the principle of LESO to improve its observation performance. The improved LADRC applies to the vector speed control of the induction motor. Additionally, low-speed and high-speed no-load starting, sudden load, electromagnetic torque, and three-phase stator current of the induction motor was simulated using MATLAB (Developed by MathWorks in Natick, MA, USA, and dealt by MathWorks Software (Beijing) Co., Ltd. in Beijing, China). Theoretical analysis and simulation results show that the ADRC based on the improved linear expansion observer was better than the traditional linear ADRC in terms of the dynamic and static performance and robustness.

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