Speed control of Three phase induction motor - Phase Controlled Rectifiers and Bridge Inverters

TL;DR

Learn how to control the speed of a three-phase induction motor by changing parameters such as synchronous speed, load, and stator or rotor characteristics.

Transcript

Click the Bell icon to get latest videos from Ekeeda Hello friends in this video we are going to see the speed control of the three-phase induction motor we have seen the working principle of a three-phase induction motor in a previous video we have also seen what are the slip and torque characteristics of the three-phase induction motor so we are ... Read More

Key Insights

• 🚄 The formula for the speed of a three-phase induction motor is n = NS * (1 - s), where NS is the synchronous speed and s is the slip.
• 🧑‍🦼 The torque of the motor and the load determines the speed of the motor.
• 🧑‍🦼 Changing the load connected to the motor can vary the motor's speed.
• 🐎 Parameters of the stator and rotor, such as supply frequency, voltage, external resistance, and winding, can be adjusted to control the speed.
• 🐎 Varying the synchronous speed or the slip enables control over the speed of a three-phase induction motor.
• 🧑‍🦼 Increasing the torque of the motor compared to the load will result in an increase in the motor's speed.
• 🧑‍🦼 The speed of the motor can be decreased by reducing the torque of the motor compared to the load.

Questions & Answers

Q: What is the formula for the speed of a three-phase induction motor?

The speed (n) of a three-phase induction motor is given by n = NS * (1 - s), where NS is the synchronous speed and s is the slip.

Q: How does changing the load affect the motor's speed?

If the torque of the motor is less than the torque of the load, the speed of the motor will decrease. Conversely, if the torque of the motor is greater than the torque of the load, the speed of the motor will increase.

Q: What are some parameters that can be controlled to change the speed of a three-phase induction motor?

Parameters such as supply frequency, voltage, external resistance of the stator, and rotor frequency and resistance can be varied to control the speed of a three-phase induction motor.

Q: How can the synchronous speed be changed to control the speed of a motor?

The synchronous speed (NS) can be changed by altering the number of poles in the motor or adjusting the supply frequency.

Summary & Key Takeaways

• Understanding different methods to control the speed of a motor is essential for various applications.

• The speed of a three-phase induction motor can be controlled by changing the synchronous speed or the slip.

• Torque plays a crucial role in determining the speed of the motor, and it depends on the torque of the motor and the load.

• Parameters of the stator and rotor, such as supply frequency, voltage, external resistance, and winding, can also be adjusted to control the speed.