scholarly journals Phase Current Measurement Method of Dual Inverter-Motor Drive System Using a Single DC Link Current Sensor

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5626
Author(s):  
Seon-Ik Hwang ◽  
Seong-Hyeon Cho ◽  
Jun-Hyung Jung ◽  
Jang-Mok Kim
Keyword(s):  
Electric Propulsion ◽  
Pulse Width Modulation ◽  
Error Component ◽  
Drive System ◽  
Motor Drive ◽  
Switching Frequency ◽  
Two Phase ◽  
Phase Current ◽  
Current Sensors ◽  
Motor Drive System

In recent years, electric propulsion systems have become widely, used and these systems have strict limits in volume and weight. Therefore, it is necessary to reduce the weight of the inverter-motor drive system. In a typical inverter-motor drive system, at least phase current sensors are required. In order to reduce the number of phase current sensors, this paper proposes a method for measuring phase current using DC link current sensors in a inverter-motor drive system. Two phase currents per inverter-motor system are measured during one period of the switching frequency using the pulse width modulation (PWM) shift method. However, since the measured phase current contains an error component in the average current, the error component was compensated for in order to obtain a current similar to the actual phase current by using the slope and dwell time of the phase current. The effectiveness of the proposed method is verified through experiments.

Measurement of Positioning Barrel Eccentric Hole Based on Machine Vision Technology

2011 ◽  
Vol 143-144 ◽  
pp. 726-730
Author(s):  
Xue Feng Wu ◽  
Yu Fan
Keyword(s):  
Edge Detection ◽  
Drive System ◽  
Motor Drive ◽  
Image Process ◽  
Stepping Motor ◽  
Two Phase ◽  
Position Information ◽  
Detection Technology ◽  
Actual Space ◽  
Motor Drive System

A measurement based on image process is proposed for detecting the hole on a barrel. The barrel image is separated from background with the image edge detection technology. The different detection operators are compared and the sobel operator is used for edge detection. The actual space position of the hole on barrel is computed by circle detecting method. Gradient hough transform is used for detecting circle position information, including circle radius and two dimension coordinates. The stepping motor drive system is consists of a control card, stepping motor drive units and two two-phase hybrid stepping motors. Automatic positioning is achieved through stepping motor drive system.

A pulse-width modulation technique for BLDC motor drive system to reduce commutation time

2017 ◽  
Vol 8 (3) ◽  
pp. 249
Author(s):  
Mohammadreza Zahabi ◽  
Ahmad Ale Ahmad ◽  
Gholamreza Ardeshir ◽  
Shabanali Gol
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Drive System ◽  
Motor Drive ◽  
Bldc Motor ◽  
Modulation Technique ◽  
Motor Drive System

A Novel Ultrasonic Motor Driver Based on Two Phase PWM Signals

2011 ◽  
Vol 189-193 ◽  
pp. 1543-1546
Author(s):  
Tie Min Zhang ◽  
Zhi Yang Xie ◽  
Jian Tao Zhang
Keyword(s):  
Phase Difference ◽  
High Frequency ◽  
Ultrasonic Motor ◽  
Drive System ◽  
Motor Drive ◽  
Two Phase ◽  
Power Drive ◽  
Phase Signal ◽  
Drive Circuit ◽  
Motor Drive System

An ultrasonic motor (USM) has been widely used in many applications since it has several advantages over the conventional electromagnetic motor, such as high torque at low speeds, no electromagnetic interference, and high holding torque without power supply. However, in order to achieve high efficiency, its electrical drive system presents unique challenges, especially in producing two-phase signal (high frequency, high voltage, phase difference of two-phase signal) input to a low impedance capacitive motor. In this paper, a novel drive system based on microcontroller (ATmega16) has been proposed for ultrasonic motor. Drive system includes power drive circuit and control system. Power drive circuit is combined from Push-Pull Inverter to provide high-frequency two-phase voltages. A microcontroller was used to control ultrasonic motor drive system. PWM signals were generated and then directly applied to the MOSFET drivers for speed control of ultrasonic motor. The frequency and phase difference of two phase PWM signals can be directly changed by microcontroller. Detailed experimental results are provided to demonstrate the successful of the proposed drive system.

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