Induction Motor Working Principle
(Asynchronous Motor)
Electromagnetic Induction

Wound Rotor Working Principle
stator like a squirrel cage
rotating magnetic field

Reluctance Motor Working Principle
stator and the rotor similar
to a normal electric motor

Brushless DC Motors
Working Principle
Using an Electronic Controller

Parallel between two Generators
involves synchronizing their voltage
frequency, phase angle

Step-by-step sequence to activate
parallel operation between
two generators

Isochronous Control Sharing
a method for paralleling
multiple generators

Droop control enables
two or more generators
Working Principle

Current relays are protective devices
short circuits or overloads
current exceeds a set limit

Phase Failure/Sequence Relays (PSR)
Three-phase electrical systems
Tripping the circuit if faults occur

Electromechanical relay
electromagnet to mechanically
de-energized, a spring returns

Monitoring Relays
electrical parameter(like voltage/current)
opening contacts to shut down

Minimum and Maximum Voltage Relays
undervoltage or overvoltage
input and trigger a contact

Locked Rotor Relays
detecting when the rotor stops turning
potentially melting windings

Solid-State/Digital Relays (SSRs)
input signal to activate
an internal light source

Regulating Relays
operate an electromagnetic switch
automatic switching

Short-circuit protection for motor relays
MCCB (Molded Case Circuit Breaker)
(MCB (Miniature Circuit Breaker)

Voltage & Frequency Relays
Crucial electrical protection devices
prevent equipment damage

Thermal relays protection
overheating by using a
bimetallic strip

Auxiliary relays
control multiple circuits
provide interlocking, or lock

Earth/Ground Fault Relay
detect current leaking
quickly trips the circuit breaker

Motor and generator relays
low-power signal to control high-power
creating a magnetic field in a coil

Magnetic Latching Relays
using a brief electrical pulse
to create a magnetic field