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posted on 22 Feb 2024
Star delta controlling is a method used to reduce the starting current of induction motors.
Star delta controlling involves initially connecting the motor windings in a star configuration for starting, then switching to a delta configuration for running.
It is commonly used for large induction motors to reduce the starting current and torque.
The transition from star to delta configuration is typically controlled by a mot...
In star delta connection, typically two contactors are used.
In star delta connection, one contactor is used for star connection and another contactor is used for delta connection.
The star contactor is typically rated for the current of one winding, while the delta contactor is rated for the full motor current.
Using two contactors helps in reducing the starting current and torque in the motor.
For example, a 3-phase moto...
Single line diagram for DOL is a simple representation of Direct-On-Line motor starter circuit.
DOL starter consists of a contactor, overload relay, and start/stop push buttons.
The single line diagram shows the connections between these components.
The power supply is connected to the contactor, which is then connected to the motor.
The overload relay is connected in series with the motor to protect it from overloading.
St...
posted on 29 Mar 2022
There are various types of conveyors, gears and gearboxes, and bearings used in mechanical maintenance. Pulling bearings requires proper technique.
Types of conveyors include belt, roller, chain, and screw conveyors
Types of gears include spur, helical, bevel, worm, and planetary gears
Types of bearings include ball, roller, and sleeve bearings
To pull a bearing, use a bearing puller tool and apply force evenly to avoid da
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