Understanding AC Motor Types: Synchronous & Induction
AC Motor Types: Synchronous and Induction
Synchronous Motors
Two basic types of polyphase AC motors exist: synchronous and induction. The synchronous motor operates like a three-phase alternator in reverse. Its field magnets, mounted on a rotor, are energized by direct current. The armature coils are divided into three parts and receive three-phase alternating current. The varying current waves in the armature reaction create variable magnetic poles, causing the field to rotate at a constant speed,
Read MoreData Communication and Transmission: A Comprehensive Overview
1. DTE and DCE: Definition and Examples
DTE (Data Terminal Equipment)
Acts as the source or destination of data and manages communication control. Examples include terminals and computers.
DCE (Data Circuit-terminating Equipment)
Adapts the digital signal to the transmission medium’s characteristics. Examples include routers and modems.
2. Parallel vs. Serial Transmission
Parallel Transmission
Advantage: High speed, potentially increasing transfer rate by a factor of n.
Disadvantage: High cost due to requiring
Read MoreElectrical Measurement & Lighting Essentials
Tension or Measures of Potential Difference
a) Measure the voltage or potential difference (volt) measured tension. This is formed inwardly by a coil with many turns and a small section, resulting in large internal resistance. It is connected in parallel. Voltmeters are used to measure three-phase switches.
Measures of Intensity (Ammeter)
b) Measures the current. It consists of a coil with few turns and large sections. Its connection is in series to measure the desired intensity. Three-phase switches
Read MoreThree-Phase AC Generators and Induction Motors
(05) Engines: 3f-2 Phase Systems
General Concepts
A three-phase AC generator consists of three alternating electromotive forces (EMFs) with a 120-degree electrical phase delay between them. These are called phases and designated as R, S, and T.
A system is balanced when frequencies and RMS values are equal, and phases are symmetrically out of phase.
If impedances differ, causing different phase currents, it’s an unbalanced system, even with balanced voltages.
Advantages include simpler energy transport
Read MoreEmergency Response Codes: Fire, Rescue, and Communication
Central Alarm
Mute Transmissions: 0-0
Extend ERP Report: 0-1
Consulted and Informed: 0-2
Change Repeat: 0-3
It is…: 0-4
Indicate Location: 0-5
Refer to Place Without Warning: 0-6
Reach Place Without Warning: 0-7
Out of Service: 0-8
Service: 0-9
Return to Barracks: 0-10
Guard at Headquarters: 0-11
Required to Place
Carabineros: 1-0
Air Support: 1.1
Ambulance: 1.2
Community Emergency Office: 1.3
Publicly Shown (Essal, Saesa, etc.): 1.4
CONAF: 1.5
Guard Commander: 1.6
Captain of the Guard: 1.7
Technical Studies Department:
Fundamentals of Electricity and Electrical Installations
Atoms and Electric Charge
An “atom” is the smallest part of a chemical element that retains its properties. “Electric charge” is the excess or defect of electrons in a body.
Electricity and Current
“Electricity” is the orderly movement of electrons through a material. “Sense of electricity” is the direction of moving electrons.
Classes of Electric Current
- Direct current (DC): The flow is constant and does not change direction.
- Alternating current (AC): The electron flow is variable and changes direction.