Electric motors

In these applications, the three-level inverters often need to operate with modulation indices (m) lower than 0.5 [6]- [10]. Additionally, at lower modulation indices, traction drives operating with induction motors (IMs), interior permanent magnet motors (IPMs) or synchronous reluctance motors (SynRMs) may need to provide higher reactive power, thus operating with a lower power factor (pf) [9], [11]- [17]. For example, in [9], the power factor of IPMSMs at 0.2 modulation index is shown to be…

Chapter 3 Interleaved Buck Converter System 3.1 INTRODUCTION Interleaved Buck Converter has lots of concentration due to its simple and low control complexity in application. where no isolation and high output current with low ripple. An No isolation DC/DC converter Fig.1.1 shows the step-down DC/DC converter. When switch M is on for the duration of dTs, power is transferred from source to load and filter inductor L is charged. When switch M is off for a duration (1-d)Ts, the diode D…

In essence, Tesla coils are a high-voltage, resonant transformer circuits. They consist of the six major components (Behrend 1), namely: Primary transformer Tank capacitor Spark gap Primary coil Secondary coil Toroid Figure 1: Tesla coil (diagram) A primary transformer is a step-up transformer that takes the line voltage of the AC source and steps it up to a range between 12 kV and 50 kV at 60 Hz (Johnson 4). The efficiency of this transformer is largely dependable on the construction…

To assure the effective performance of controller over wide range of system operations and to increase the transient stability of the system, a supplementary fuzzy logic controller (FLC) based on the Mamdani's fuzzy inference method is designed for the PI controller input. FLC generates the required small change for voltage to control the magnitude of the injected voltage. The centroid defuzzyfication technique is used is this fuzzy controller. The below fig describes the FLC structure. In this…

A robotic arm with 2 active motors has been used to demonstrate the plenty applications that this technology could be used for. The Raspberry Pi was adopted as the environment for the above project because of its sheer flexibility and adaptability. The Python environment used involved use of the IDLE interpreter for testing purposes. The Open CV library used enables the user to include…

Microhardness and microstructural analysis of friction stir welded AA5052-H34 joints B. Magamai Radja,* and T. Senthilvelana aDepartment of Mechanical Engineering, Pondicherry Engineering College, Pondicherry University, Puducherry 605 014, India Abstract Friction stir welding a novel solid state welding which gains momentum in versatile applications viz., aerospace, marine, defense equipments and automobile industries. In the present work, AA 5052-H34 weldments have been prepared by FSW…

section, the static analysis, forward kinematics and inverse kinematics for the manipulator arm will be discussed. A. Static Analysis The static analysis is very significant in manipulator’s design to roughly approximate the required torques from each motor. In our design, it is important to check the stability of the quadcopter that the manipulator is integrated on it in terms of manipulator arm center of mass shifting as function of joint angles; as mentioned before the excessive shifting of…

Pop filters When recording vocalists, you will most definitely need to place a pop filter between the singer and vocal mic. A pop filter will cut down on the mini-explosions of air that happen when a singer says “B” or “P”. Don’t ever leave this job for a compressor down the line. Pop filters also serve the secret purpose of blocking all spit spray from reaching your prized vocal mic. It is not uncommon to find studios stacking two pop filters depending on the singers style. Here are a couple of…

Activity 3: Bullroarers Lesson Objective: Students will simulate the function a propeller by creating an ancient signaling device known as a bullroarer. Set-Up: Each student will need one craft stick, one index card, one rubber band and 2 paper clips. Groups of students can share measuring tape, string, markers and masking tape. Demo and discussion: Bullroarers have been used by many cultures, throughout many continents, for thousands of years. Anthropologists, scientists who study ancient…

3.3 MUFFLER A muffler is a device for decreasing the amount of noise emitted by the exhaust of an internal combustion engine. Muffler ssignificantly attenuating noise output from the engine. Purpose of Muffler: Performance mufflers have three goals for perfect operation. To absorb and dissipate. To move exhaust gasses, To maintain power and performance of the engine while achieving the first two goals. About Exhaust Noise Sound is simply a vibration that spreads as a wave through air. This…