Conceptual Design of a Novel Three-Speed Geared Motor

2013 ◽  
Vol 284-287 ◽  
pp. 629-633
Author(s):  
Yi Chang Wu ◽  
Chia Ho Cheng
Keyword(s):  
Rotational Speed ◽  
Integrated Design ◽  
Gear Train ◽  
Bldc Motor ◽  
Direct Drive ◽  
High Rotational Speed ◽  
Brushless Dc ◽  
Speed Range ◽  
Structural Assembly ◽  
Driving Torque

The purpose of this paper is to develop a novel three-speed geared motor that integrates a basic epicyclic-type gear train with an exterior-rotor brushless DC (BLDC) motor to form a compact structural assembly. Unlike existing gear motors, the proposed device provides three speed ratios including an under drive, a direct drive, and an over drive, and is operated with a single clutch-to-clutch shaft. It provides a wider speed range than the traditional geared motor. Such an integrated design can be appropriately employed in high driving torque and low rotational speed applications or high rotational speed and low driving torque applications.

scholarly journals Turbomachine Design for Supercritical Carbon Dioxide Within the sCO2-HeRo.eu Project

2018 ◽  
Vol 140 (12) ◽  
Author(s):  
Alexander Hacks ◽  
Sebastian Schuster ◽  
Hans Josef Dohmen ◽  
Friedrich-Karl Benra ◽  
Dieter Brillert
Keyword(s):  
Rotational Speed ◽  
Mechanical Design ◽  
Integrated Design ◽  
Mechanical Analysis ◽  
High Rotational Speed ◽  
Through Flow ◽  
Compressor Impeller ◽  
Final Design ◽  
Manufacturing Techniques ◽  
Future Work

The paper aims to give an overview over the keystones of design of the turbomachine for a supercritical CO2 (sCO2) Brayton cycle. The described turbomachine is developed as part of a demonstration cycle on a laboratory scale with a low through flow. Therefore, the turbomachine is small and operates at high rotational speed. To give an overview on the development, the paper is divided into two parts regarding the aerodynamic and mechanical design. The aerodynamic design includes a detailed description on the steps from choosing an appropriate rotational speed to the design of the compressor impeller. For setting the rotational speed, the expected high windage losses are evaluated considering the reachable efficiencies of the compressor. The final impeller design includes a description of the blading development together with the final geometry parameters and calculated performance. The mechanical analysis shows the important considerations for building a turbomachine with integrated design of the three major components: turbine, alternator, and compressor (TAC). It includes different manufacturing techniques of the impellers, the bearing strategy, the sealing components, and the cooling of the generator utilizing the compressor leakage. Concluding the final design of the TAC is shown and future work on the machine is introduced.

scholarly journals Designing of a BLDC motor bench

2020 ◽  
Vol 10 (2) ◽  
pp. 35-40
Author(s):  
Pálma Kapitány ◽  
József Lénárt
Keyword(s):  
Rotational Speed ◽  
Hydraulic System ◽  
Dc Motor ◽  
Brushless Dc Motor ◽  
Bldc Motor ◽  
Hydraulic Circuit ◽  
Hydraulic Pump ◽  
Brushless Dc ◽  
Mechanical Connection

This paper deals with designing and development of a bench for the test of a brushless DC motor. The bench contains a hydraulic circuit, which provides a controllable load for the motor. The hydraulic system is equipped with a hydraulic pump and choke valve and a manometer. The mechanical connection between the hydraulic pump and the BLDC motor is designed with two clutches and structure of two sheet plates. The bench contains a torque meter, which is built between the two shafts of the motor and pump. The system can determine rotational speed, torque, current and voltage with respect of the load.

scholarly journals Speed control of sensorless brushless DC motor by computing back EMF from line voltage difference

2020 ◽  
Vol 9 (2) ◽  
pp. 125
Author(s):  
R. Sivakami ◽  
Thangaraj K.
Keyword(s):  
Acoustic Noise ◽  
Brushless Dc Motor ◽  
Bldc Motor ◽  
Matlab Simulation ◽  
Line Voltage ◽  
Rotating Speed ◽  
Brushless Dc ◽  
Switching Losses ◽  
Speed Range ◽  
Source Voltage

Sensorless operation of permanent magnet brushless direct current (BLDC) motor drive controls the rotating speed with different applied voltage. No phase lagging is produced which leads to increase the efficiency and minimize the torque pulsation of the BLDC motor. Initially, motor can be started by following the v/f method then allows the sensorless mode after reaching the minimum speed of 500-1000rpm. The Sensorless BLDC motors are highly used due to higher efficiency, reliability power, acoustic noise, smaller, lighter, greater dynamic response, better speed versus torque characteristics, higher speed range and longer life. Thus the source voltage spikes and switching losses are reduced. This method can be demonstrated through MATLAB simulation and DSP TMS 320LF2407A is used in the experimental setup to get the output

Turbomachine Design for Supercritical Carbon Dioxide Within the sCO2-HeRo.EU Project

2018 ◽  
Author(s):  
Alexander Hacks ◽  
Sebastian Schuster ◽  
Hans Josef Dohmen ◽  
Friedrich-Karl Benra ◽  
Dieter Brillert
Keyword(s):  
Rotational Speed ◽  
Mechanical Design ◽  
Integrated Design ◽  
Mechanical Analysis ◽  
High Rotational Speed ◽  
Through Flow ◽  
Compressor Impeller ◽  
Final Design ◽  
Manufacturing Techniques ◽  
Future Work

The paper aims to give an overview over the keystones of design of the turbomachine for a supercritical CO2 (sCO2) Brayton cycle. The described turbomachine is developed as part of a demonstration cycle on a laboratory scale with a low through flow. Therefore the turbomachine is small and operates at high rotational speed. To give an overview on the development the paper is divided into two parts regarding the aerodynamic and mechanical design. The aerodynamic design includes a detailed description on the steps from choosing an appropriate rotational speed to the design of the compressor impeller. For setting the rotational speed the expected high windage losses are evaluated considering the reachable efficiencies of the compressor. The final impeller design includes a description of the blading development together with the final geometry parameters and calculated performance. The mechanical analysis shows the important considerations for building a turbomachine with integrated design of the three major components turbine, alternator and compressor (TAC). It includes different manufacturing techniques of the impellers, the bearing strategy, the sealing components and the cooling of the generator utilising the compressor leakage. Concluding the final design of the TAC is shown and future work on the machine is introduced.

scholarly journals Rotational Speed Control of Brushless Dc Motor Using Genetic Algorithm Optimized PD Controller

2018 ◽  
Vol 18 (2) ◽  
pp. 75
Author(s):  
Rizqi Andry Ardiansyah ◽  
Edwar Yazid
Keyword(s):  
Genetic Algorithm ◽  
Steady State ◽  
Rotational Speed ◽  
Speed Control ◽  
Pd Controller ◽  
Bldc Motor ◽  
Steady State Condition ◽  
Brushless Dc ◽  
Absolute Encoder ◽  
Rotational Speed Control

Controlling the rotational speed of brushless DC (BLDC) motor is an essential task to improve the transient and the steady state performances under loaded condition. Rotational speed control of BLDC motor using genetic algorithm optimized proportional-derivative (PD) controller to form what the so-called the genetic algorithm-PD (GA-PD) controller is proposed in this paper. Control system is realized in a microcontroller namely a 16MHz Atmega2560 with an absolute encoder as a position sensor. The effectiveness of the GA-PD controller is tested under constant and varying step functions with the Ziegler-Nichols-PD (ZN-PD) controller as a benchmark. Experimental results show that the GA-PD controller has slower speed than the ZN-PD controller, but the latter has overshoot and small oscillations during its steady state condition as a consequent of having a fast rise time.

scholarly journals Improving Performance of Cantilevered Momentum Wheel Assemblies by Soft Suspension Support

2013 ◽  
Vol 20 (4) ◽  
pp. 737-748 ◽  
Author(s):  
Weiyong Zhou ◽  
Dongxu Li
Keyword(s):  
Rotational Speed ◽  
Ball Bearings ◽  
Rigid Support ◽  
High Rotational Speed ◽  
Trade Off ◽  
Jeffcott Rotor ◽  
Speed Range ◽  
Before And After ◽  
In Series ◽  
Large Disturbance

This paper focuses on improving the performance of the rigid support cantilevered momentum wheel assemblies (CMWA) by soft suspension support. A CMWA, supported by two angular contact ball bearings, was modeled as a Jeffcott rotor. The support stiffness, before and after in series with a linear soft suspension support, were simplified as two Duffing's type springs respectively. The result shows that the rigid support CMWA produces large disturbance force at the resonance speed range. The soft suspension CMWA can effectively reduce the force on the bearing (also disturbance forces produced by the CMWA) at high rotational speed, and also reduce the nonlinear characteristic of the stiffness. However, the instability of the soft suspension CMWA will limit the maximum rotational speed of the CMWA. Thus, a "proper" stiffness of the soft suspension system is a trade-off strategy between reduction of the force and extension of the speed range simultaneously.

Performances of HSK Tool Interfaces under High Rotational Speed

CIRP Annals ◽  
2001 ◽  
Vol 50 (1) ◽  
pp. 281-284 ◽  
Author(s):  
T. Aoyama ◽  
I. Inasaki
Keyword(s):  
Rotational Speed ◽  
High Rotational Speed

scholarly journals A Data Driven RUL Estimation Framework of Electric Motor Using Deep Electrical Feature Learning from Current Harmonics and Apparent Power

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3156
Author(s):  
Tanvir Alam Shifat ◽  
Rubiya Yasmin ◽  
Jang-Wook Hur
Keyword(s):  
Reactive Power ◽  
Short Term Memory ◽  
Estimation Method ◽  
Feature Learning ◽  
Remaining Useful Life ◽  
Total Power ◽  
Bldc Motor ◽  
Current Harmonics ◽  
Power Monitoring ◽  
Brushless Dc

An effective remaining useful life (RUL) estimation method is of great concern in industrial machinery to ensure system reliability and reduce the risk of unexpected failures. Anticipation of an electric motor’s future state can improve the yield of a system and warrant the reuse of the industrial asset. In this paper, we present an effective RUL estimation framework of brushless DC (BLDC) motor using third harmonic analysis and output apparent power monitoring. In this work, the mechanical output of the BLDC motor is monitored through a coupled generator. To emphasize the total power generation, we have analyzed the trend of apparent power, which preserves the characteristics of real power and reactive power in an AC power system. A normalized modal current (NMC) is used to extract the current features from the BLDC motor. Fault characteristics of motor current and generator power are fused using a Kalman filter to estimate the RUL. Degradation patterns for the BLDC motor have been monitored for three different scenarios and for future predictions, an attention layer optimized bidirectional long short-term memory (ABLSTM) neural network model is trained. ABLSTM model’s performance is evaluated based on several metrics and compared with other state-of-the-art deep learning models.

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