Mohd Rudzuan Mohd Nor
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Preferred name
Mohd Rudzuan Mohd Nor
Official Name
Mohd Rudzuan, Mohd Nor
Alternative Name
Nor, Rudzuan M.
M. N., Rudzuan
Mohd Nor, Rudzuan
Nor, Rudzuan Mohd
Main Affiliation
Scopus Author ID
55898879600
Researcher ID
DXC-5133-2022
FMW-2039-2022

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Validation of Electrical Noise of a DC Motor through Controlled Varistor Cracking: An Experimental Study

2023-01-01 , Mohd Rudzuan Mohd Nor , Zainudin G. , Wan Mohd Nooriman Wan Yahya , Sofi Y. , Nordiana S. , Norlaili S. , Shazmin Aniza Abdul Shukor , Zuradzman Mohamad Razlan

The varistor is an electronic component that protects the DC motor's circuitry from electrical noise or transients that can cause damage. It works as a voltage-dependent resistor that can change its resistance according to the applied voltage. Once the voltage surpasses a specific threshold, the varistor conducts and directs the excess voltage away from the motor's circuitry. In small DC motor manufacturing, ring varistors are vital for reducing electrical noise, minimizing spark-induced damage to the commutator and brush, and extending the motor's lifespan. Additionally, they prevent damage to electronic parts in the customer's mechanism set. The objective of this study is to investigate the impact of varistor cracks or chips that may occur during the soldering process of varistors to the commutator. To confirm the occurrence of cracks or chips, intentional damage will be inflicted on the varistors. The study aims to determine how the presence of cracked or chipped varistors affects the electrical noise produced by a DC motor during its operation. The resulting spark was observed through an oscilloscope, and it was found that the effect could be substantial, up to 5 to 10 times the rated voltage supplied to the motor. In the next phase of this study, further tests will be conducted on motors without varistors to provide a comparison.

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Temperature Distribution Analysis of Lithium-Ion Polymer Battery Surface

2022-01-01 , Murali Rishan , Zuradzman Mohamad Razlan , Shahriman Abu Bakar , Suffer K.H. , Ibrahim Z. , Wan Khairunizam Wan Ahmad , Mohd Rudzuan Mohd Nor , Muhammad Faisal Hamidi @ Abdul Rani

The main objective of this study is to investigate the heat load generated by the Lithium-ion (Li-ion) battery during the completion of the cycle. Besides that, the objective is also to identify the most affected surface of the Li-ion battery towards the temperature during the charging and discharging process. An experiment is carried out for five different conditions of battery to obtain the data for heat load calculation purposes. The five conditions are differences in discharge ampere. From the result obtained there are differences in heat load generated by the battery during the charging and discharging process for every condition. Furthermore, the greater the discharge ampere, the lower the time taken for the battery to discharge and the higher the heat load generated by the battery. Besides that, an experiment to investigate the temperature distribution along the experiment is also carried out. Four surfaces of battery (front, right, left, back in vertical position of battery) are put into concern in obtaining the temperature distribution. Every surface gives a different temperature distribution during the experiment. Surface 4 recorded the highest average temperature distribution. Thus, the cooling system will consider the cooling capacity at this surface.

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Developing an autonomous mobile robot and a study of navigation towards nonholonomic problems

2009-10-11 , Mohd Rudzuan Mohd Nor , Hazry Desa , Mohd Sofian Muhammad Rosbi , Nagarajan, R.

In this paper, we present the first stage of developing mobile robot for use in a study of mobile robot navigation and its stability. Three basic navigation problems for Nonholonomic mobile robot are tracking a reference trajectory, path following and desire posture stabilization. In this study, we will focus on the trajectory tracking which means tracking reference trajectories predefined or given by path planners. The kinematics controller is usually applied to control the robot position and motion path. It is assumed that masses as well as inertias of the robot and wheels are negligible. Therefore the stability and robustness of the wheeled mobile robot cannot be analyzed. Furthermore, in many research and developments of mobile robot in trajectory tracking stability, one of the problems faced by the researches was sudden increase in motor speed (also known as speed jump or velocity jump) during the first few moments of motor’s rotation which results in the tracking error occurred during the trajectory. Above drawbacks can be overcome by including a dynamic modeling in the motion controller.

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