What are the methods to control the speed of induction motor and which one is the most efficient one?

Question

M Khawer Riaz · Answer

u can control the motor speed by using gear box or VFD drives and VFD (Variable Frequency Drives are the best choice on Torque,power saving,Constant speed Application.

Amr Saleh · Answer

A gear box - softstarter - Vfd ‚Vfd is the best u can change the speed via analog values or through vfd interface.

Omar Hayat · Answer

Simply you install a VVVF converter & use Frequency drive motor

Muhammad Sabir · Answer

Yes VFD is the most suitable device for controlling the speed of motor.

himanshu himanshu · Answer

Vfd best option for speed control.

Raheel Rehman · Answer

Using gears will not be a suitable decision, it can be done by adding resistance, a person can use capacitors and relays to reduce the speed of any kind of motor. Normally we use capacitors to increase and decrease the speed.

ZIA UL HAQ IBRAMSHA · Answer

DOL Starter

Star / Delta Starter

Soft Starter (Variable Frequency Drive).

I have mentioned the above all are the type of starters for control the Induction motors. But the selection of starters is depends to the type of application, load & cost.

Muhammad Aamir Ali · Answer

Armature control method is the best method to control the speed of induction motor

Izhar Muhammad · Answer

Vdf is the best option for speed control 
But that depend on your method

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What are the methods to control the speed of induction motor and which one is the most efficient one?

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