Page 284 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

Mixer Grinder Internal Circuit Diagram:

Universal Series Motor:
Universal series motors are those which are designed to operate with both AC and DC supply.

Here the word ‘series’ used because its field windings are connected in series with the armature winding.
In the above circuit diagram, you can also see there are two series windings. One of these is tapped in three posi-
tions. And those tappings are connected to the speed control switch. So this arrangement is for speed control of
the motor. So we can obtain three different speeds(low, medium, high) by rotating the switch. Also, you can see
the mixer grinder motor connection below.

Thermal Overload Relay or overload switch:
A thermal Overload Relay or overload switch is used to protect the device from overload or overcurrent fault. If the
motor draws overcurrent due to any internal fault, or improper use, the overload relay will automatically disconnect
the power supply to the motor. As the mixer grinder is a home appliance, so the thermal overload relay is very
helpful to prevent accidents such as burning of motor, fire, and melting due to over current. The overload switch
also helps to turn off the motor if you run it for a long time. After fully cool down it will be got automatically turned
on. You can see the mixer grinder overload switch connection diagram below.

Three-Position Rotary Switch:
It has a total of four terminals. The first one is the input terminal and the other three are output terminals where the
terminals of the motor are to be connected. You can see the mixer grinder rotary switch connection diagram below.
Power Switch:

Most of the mixer grinders have the function to switch on and off in their speed control switch but some mixer
grinders come with a separate power switch to on and off.
Mixer Grinder Connection Diagram:

Here, you can see the connection diagram of the Mixer Grinder below.

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CITS : E & H - Electronics Mechanic - Lesson 160 - 179