DC Motor and MCC Motor: Principles and Operation
Constitution of an MCC Motor
It is based on the principles of electromagnetic force and induced electromotive force. To carry out these principles, it consists of inductive motors and induced components:
- Inductor: Its mission is to create the electric field. It is located in the fixed part or stator of the motor. It is formed by a copper wire coil placed around a ferromagnetic material with polar exhibition. The coil carries an electric current, whose direction will depend on the sign of the magnetic
Understanding Cam, Brakes, Bearings, and Lubrication
Cam Systems and Brakes
A cam returns to its initial position, and the pads are separated from the face of the drum by the spring action.
Hydraulic Brake Systems
In a hydraulic drive system, stepping on the brake pedal causes the master cylinder piston to push fluid through the pipes. This fluid reaches the pump body and drives the pistons. The piston’s action overcomes the spring resistance, causing friction on the drum pads, which produces braking. When the pedal is released, the spring between the
Read MoreUnderstanding Magnetic Fields: Properties, Generation, and Applications
Magnetic Field
A magnetic field is a region around an electric current or magnetic substance where magnetic phenomena (attraction, repulsion) are observable.
Its shape can be visualized by sprinkling iron filings on a sheet of cardboard placed over a magnet. The filings align along lines indicating the field’s direction and strength, known as lines of induction or magnetic field lines.
A line of force represents the path an imaginary north pole would follow under the influence of the magnetic field,
Read MoreChemical Contaminant Measurement in the Workplace
Chemical Contaminant Measurement Methods
Direct and Indirect Measurement
The measurement of chemical contaminants in a job can be performed using the following general methods:
- Direct Measurement: This involves using direct-reading instruments in the workplace to obtain immediate, in situ results.
- Indirect Measurement: This method involves collecting test samples and using pollutant sensors for analysis.
Static vs. Personal Measurements
There are two main types of measurements:
- Static Measurements: These
Understanding Milling Machine Operations & Best Practices
Milling Operations Explained
This document details common milling operations and best practices.
Types of Milling Operations
Planned: This is the most common operation, used to machine flat surfaces. It can be done by two procedures:
- Face Milling: Using a blade plate or a tapered two-cut plan.
- Tangential Milling: Using a plan to drill a cut.
There are two main types of milling based on the cutter’s rotation relative to the workpiece:
- Conventional Milling (Up Milling): The cutter rotates in the opposite
Acoustic Biosensors: Principles, Types, and Applications
Week 6: Acoustic Biosensors
The principle behind acoustic biosensors is based on a mechanical wave propagating through piezoelectric or other materials. Any material changes at the surface will modify the wave’s propagation path, altering the electrical response of the sensor.
A key advantage of acoustic sensing is its ability to offer real-time measurement of surface interactions, which is particularly useful in studying protein binding events and immunochemical reactions.