Comparison of direct drive and high speed drive concepts for the use in wheel-hub-drives

2016 ◽  
Author(s):  
K. Reis ◽  
A. Binder
Keyword(s):  
High Speed ◽  
Direct Drive

Design and control of a high-speed direct-drive manipulator

1989 ◽  
Vol 27 (3) ◽  
pp. 375-394 ◽  
Author(s):  
K. YOUCEF-TOUMI ◽  
A. T. Y. KUO
Keyword(s):  
High Speed ◽  
Direct Drive ◽  
And Control

Test Results and Analytical Predictions for Rotor Drop Testing of an AMB Expander/Generator

2006 ◽  
Author(s):  
Lawrence Hawkins ◽  
Alexei Filatov ◽  
Shamim Imani ◽  
Darren Prosser
Keyword(s):  
High Speed ◽  
High Performance ◽  
Time History ◽  
Test Results ◽  
Direct Drive ◽  
Flow Loop ◽  
Low Loss ◽  
Model Predictions ◽  
Full Speed ◽  
Insight Into

A cryogenic gas expander system that incorporates a high performance, high-speed permanent magnet, direct-drive generator and low loss magnetic bearings is described. Flow loop testing to 30,000 rpm was completed at the system manufacturer’s facility in January 2005, and field installation is scheduled for October 2005. As part of the system testing, the rotor was dropped onto the backup bearings multiple times at an intermediate speed and at 30,000 rpm. Orbit and time-history data from a full speed drop and spin down are presented and discussed in detail. A transient, nonlinear rotordynamic analysis simulation model was developed for the machine to provide insight into the dynamic behavior. The model includes the dead band clearance, the flexible backup bearing support and hard stop. Model predictions are discussed relative to the test data.

Design of a compact statically balanced direct-drive manipulator

Robotica ◽  
1990 ◽  
Vol 8 (4) ◽  
pp. 347-353
Author(s):  
Tarek M. Abdel-Rahman ◽  
M.A. Elbestawi
Keyword(s):  
Conceptual Design ◽  
Dynamic Characteristics ◽  
High Speed ◽  
Design Methodology ◽  
Dynamic Behaviour ◽  
Design Guidelines ◽  
Kinematics And Dynamics ◽  
Direct Drive ◽  
Static Balancing ◽  
Design Considerations

SUMMARYThis paper addresses the conceptual design of direct-drive manipulators which have good promise for high speed, high precision manipulation. In the design methodology presented, the procedure begins by considering the kinematic aspects and ends by configuring manipulator structures with promising kinematic and dynamic characteristics. Based on the conceptual design considerations, a novel 3 DOF (RRR) direct-drive manipulator is proposed and analyzed. The manipulator structure has only five links and a compact configuration. Manipulator kinematics and dynamics are analyzed. Design guidelines are derived for static balancing of the manipulator and for minimizing the inertias driven by the motors. Operational configurations that either improve or worsen the kinematic and dynamic behaviour or characteristics of the manipulator are identified. The proposed design has an advantage over many currently known direct-drive manipulators for achieving two desirable mechanical features, namely: static balancing and compactness (smaller driven inertias).

scholarly journals Design and Analysis of a Novel Speed-Changing Wheel Hub with an Integrated Electric Motor for Electric Bicycles

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Yi-Chang Wu ◽  
Zi-Heng Sun
Keyword(s):  
High Speed ◽  
Power Transmission ◽  
Permanent Magnet Synchronous Motor ◽  
Planetary Gear ◽  
Rear Wheel ◽  
Gear Train ◽  
Direct Drive ◽  
Element Analysis ◽  
Embodiment Design ◽  
Electric Bicycles

The aim of this paper is to present an innovative electromechanical device which integrates a brushless DC (BLDC) hub motor with a speed-changing wheel hub stored on the rear wheel of an electric bicycle. It combines a power source and a speed-changing mechanism to simultaneously provide functions of power generation and transmission for electric bicycles. As part of the proposed integrated device, the wheel hub consists of a basic planetary gear train providing three forward speeds including a low-speed gear, a direct drive, and a high-speed gear. Each gear is manually controlled by the shift control sleeve to selectively engage or disengage four pawl-and-ratchet clutches based on its clutching sequence table. The number of gear teeth of each gear element of the wheel hub is synthesized. The BLDC hub motor is an exterior-rotor-type permanent-magnet synchronous motor. Two-dimensional finite-element analysis (FEA) software is employed to facilitate the motor design and performance analysis. An analysis of the power transmission path at each gear is provided to verify the validity of the proposed design. The results of this work are beneficial to the embodiment, design, and development of novel electromechanical devices for the power and transmission systems of electric bicycles.

Application of Linear Servo Motor in Biochip Microarray Instrument

2013 ◽  
Vol 321-324 ◽  
pp. 795-798
Author(s):  
Quan Liu ◽  
Qiao Qiao Liu ◽  
Xiao Fei Wang ◽  
Xue Zhao
Keyword(s):  
High Speed ◽  
Ball Screw ◽  
Servo Motor ◽  
Direct Drive ◽  
Improve Performance ◽  
Positioning Accuracy ◽  
Linear Motors ◽  
Rotary Motors ◽  
Automation Control ◽  
Novel Design

A novel design to biochip microarray instrument is use of linear motors, in preference to conventional rotary motors driving ball screw. Three ironless core linear servo motors direct drive the X, Y and Z-axis motion, Improve performance such as superior positioning accuracy, high-speed operation and increased efficiency. The whole configuration for new microarray printing instrument is designed. Furthermore, the structure of special linear motors is also designed detailedly. And the linear servo motor automation control technology is introduced in this paper.

Design and Control of Planar Parallel Mechanisms with High Speed and High Precision

2006 ◽  
Vol 315-316 ◽  
pp. 872-0
Author(s):  
L.N. Sun ◽  
Y.J. Liu ◽  
J. Li ◽  
J. Cui
Keyword(s):  
High Precision ◽  
Disturbance Observer ◽  
High Speed ◽  
Optimization Design ◽  
Advanced Manufacturing ◽  
Parallel Mechanisms ◽  
Direct Drive ◽  
End Effector ◽  
Load Disturbance ◽  
And Control

In order to satisfy the requirement of advanced manufacturing equipments with high speed and high precision, two planar parallel mechanisms have been developed. Based on these mechanisms, firstly, in consideration with the velocity and the precision of the end-effector together, the dimension optimization design is performed based on conditioning index and the precision characteristics. Then a disturbance observer is designed for the purpose of restraining load disturbance in the direct-drive system, and the experimental results show that load disturbance can be effectively restrained by the disturbance observer.

Motion control of a two-axis linear motor-driven stage in the micro-milling process

2016 ◽  
Vol 232 (1) ◽  
pp. 65-76
Author(s):  
Mohammad S Heydarzadeh ◽  
Seyed M Rezaei ◽  
Noor A Mardi ◽  
Ali Kamali E
Keyword(s):  
Kalman Filter ◽  
High Speed ◽  
Linear Motor ◽  
Degree Of Freedom ◽  
Micro Milling ◽  
Proportional Integral Derivative ◽  
Direct Drive ◽  
Proportional Integral Derivative Controller ◽  
Proportional Integral ◽  
Two Degree Of Freedom

The application of linear motor-driven stages as the feed drivers of CNC micro milling machine tools is growing. In addition to employ high speed and high precision equipment such as linear motor-driven stages, the precision of the machined contours is highly dependent on the capabilities of the servo controllers. In this paper, the design of a precise controller for a two-axis LMDS has been investigated for micro-milling applications. In such feed drives, disturbances such as friction, force ripples, and machining forces have adverse effects on the workpiece positioning precision due to the direct drive concept behind them. Therefore, in order to have an acceptable transient response and disturbance rejection properties, a two-degree-of-freedom proportional–integral–derivative controller was employed for each axis. To design this controller, the zero-placement method was used. To compensate disturbances and machining contour errors, the utilization of Kalman filter observers, neural networks, cross-coupled controllers, and different integration of them were studied. The controllers were experimentally examined for circular motions. An integrated controller consisted of a Kalman filter disturbance observer, a cross-coupled controller, and a well-designed two-degree-of-freedom proportional–integral–derivative controller resulted in a high contouring and tracking precision. The controller could also reduce the spikes caused by the friction at the motion reversal points such as the quadrants in circle trajectories.

Frequency Response Analysis of Macro-Micro Stages With Active Disturbance Reject Controller

2019 ◽  
Author(s):  
Danping Zeng ◽  
Ruirui Huang ◽  
Zhijun Yang ◽  
Wenchao Xue
Keyword(s):  
Frequency Response ◽  
High Speed ◽  
Dead Zone ◽  
Elastic Vibration ◽  
Settling Time ◽  
Flexure Hinge ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Direct Drive ◽  
Motion Stage

Abstract Under the disturbance of friction and the elastic deformation of motion stage, the positioning accuracy of traditional mechanical bearing high speed direct-drive motion stage can only reach the micron level, which is difficult to meet the requirement of higher speed precision positioning. Therefore, the macro-micro stages utilize the flexure hinges to compensate for displacement in the friction dead zone. However, due to the nonlinear elastic vibration of the flexure hinge during the action, the settling time of micro-platform is different with stiffnesses. Effect analysis of different stiffness on the settling time of the micro-platform is significant for the platform design. According to the motion characteristics of the macro-micro stages, this paper designs the cascade extended state observer (ESO) to estimate and compensate for the disturbance and combine the proportional–derivative (PD) controller as the active disturbance rejection control (ADRC) strategy of the micro-platform position loop. Through the frequency response analysis of the control system, the influence of different stiffness on the settling time of micro-platform is explored. The simulation results show that the ADRC strategy based on cascade ESO has better robustness, and the macro-micro stages have a shorter settling time when the flexure hinge have smaller stiffness during the positioning phase.

Senior Undergraduate Design Project for the Development of a Pressurized Connector Spool

2010 ◽  
Author(s):  
Jorge Pacheco ◽  
William Maier ◽  
Ken Strupczewski ◽  
Matt Sholomskas ◽  
Shane Hunstman ◽  
...  
Keyword(s):  
High Speed ◽  
Design Procedure ◽  
Main Concern ◽  
Direct Drive ◽  
Spring Semester ◽  
Flexible Coupling ◽  
Design Project ◽  
Senior Design ◽  
Final Design ◽  
The Individual

This paper presents the objectives, design procedure and results of a senior design project during the spring semester of 2009. A team of five mechanical engineering senior students were challenged to design a pressurized connector spool for the original equipment manufacturer’s Integrated Compression System (ICS). This system is comprised of two modules: a separator/compressor and a high-speed, direct drive electric motor. In this concept, the motor and separator/compressor each are mounted on two magnetic bearings and their shafts are connected together using a flexible coupling. Because the flexible coupling has to be installed after both of the individual shafts are inserted into their casings (from opposite ends), the connector spool accessibility is a main concern. The students developed eight initial concepts that were compared using a concept screening matrix. The top two scored ideas were selected for further review. One dimensional simplified calculations were performed to roughly size these concepts. The final design chosen was then further developed using solid modeling and finite element stress analysis. The proposed design met the requirements for mechanical integrity, ease of manufacturability and improved accessibility.

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