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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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Question added by ali asif , Executive Sales Engineer , Shirazi Trading Compny
Date Posted: 2015/03/08
M Khawer Riaz
by M Khawer Riaz , Electrical & Instrumentation Jobs , Unilever Pakistan Limited

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
by Amr Saleh , Senior I&C technical office engineer , ENPPI

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

Omar Hayat
by Omar Hayat , Senior Electrician , Bestway Cement

Simply you install a VVVF converter & use Frequency drive motor

Muhammad Sabir
by Muhammad Sabir , Instrumentation & Control Mentainer , Karachi Power Plant (KANUPP)

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

himanshu himanshu
by himanshu himanshu , Sr.Electrical maintenance engineer , Acme intralog FZCO

Vfd best option for speed control.

Raheel Rehman
by Raheel Rehman , Civil Engineer , Mosasa Zaid Alshahri

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
by ZIA UL HAQ IBRAMSHA , Technical Engineer (Electrical Engineering) , Saudi Awtad Mechanical Electrical Company (SAME),

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.

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

Izhar Muhammad
by Izhar Muhammad , Associate engineer , sino hydro corporation ( china company in Pakistan)

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

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