Auto transformer starter

10/10/2010 by 11 Comments

This starter produces high efficiency and have the option to be adjusted to obtain the necessary torque and in accordance with the system.It very efficiency stater but the disadvantage is it very high cost to setup control panel stater.

It can improved torque ratio is achieved and starting current is typically 3 times Full Load Current , depending on the voltage taps selected.Typically it have taps at 50%,65% and 80% voltage.

During start-up, the motor is connected to the auto transformer’s tapping. This means that the motor starts up with a reduced voltage and a correspondingly low current.

 

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Direct on line starter

08/10/2010 by 32 Comments

Around the world it famous with name DOL starter or direct on line starter.This is the most common starting method available on the market and at basic stater for all motor application.The starting equipment consists of only a main contactor and thermal or electronic overload relay.The disadvantage with DOL starter is that it gives the highest possible starting current.

A normal value is between 6 to 7 times the rated motor current but values of up to 9 or 10 times the rated current exist.Besides then DOL starter draw the starting current there also exists a current peak that can rise up to 14 times the rated current since the motor is not energized from the the first moment when starting. read more

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Motor Overload Protection

07/10/2010 by 9 Comments

Overload protection is installed in the main control circuit or power line of motor to protect from damage due to mechanical malfunction overload conditions when it is running.

The effect of an overload is an excessive rise in temperature in the motor windings due to current higher than full load current.

Properly sized overload protection disconnects the motor from the power supply when the heat generated in the motor circuit or windings approaches a damaging level for any reason. Read More

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Frequency Inverter

07/10/2010 by 1 Comment

The Frequency Inverter or Frequency Converter is sometimes also called VSD (Variable Speed Drive), VFD (Variable Frequency Drive) or simply Drives, which is probably the most common name.

This device is very common use in industrial sector because it user friendly and easy to install.It usually can control many equipment or machinery such as :

  • Air-Condition
  • Blower & fan
  • Water pump
  • Food processor machine
  • Conveyance machinery
  • Packing machinery
  • Textile machine
  • Machine tools
  • Furnace
  • or ETC

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Soft starter

06/10/2010 by Leave a Comment

A soft starter has different characteristics to the other starting methods. It has thyristors in the main circuit, and the motor voltage is regulated with a printed circuit board.It can control the current flow to motor more efficient and stability.

The soft starter makes use of the fact that when the motor voltage is low during start, the starting current and starting torque is also low.This type of motor starting is common used for air-condition and chiller system because it can reduce starting current in rush and can made a compressor more life span.

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AC Motor Nameplate

02/10/2010 by 12 Comments

Motor name plate is the introduction or certificate for an electric induction motor.We can know in detail about an electric motor with refer to the nameplate.It same like our identification card or passport.All detail information about that electric motor we can get from this nameplate.

These parameters are then print onto the motor nameplate,it state a basic definition of what motor have received.Manufacturers often include additional information to further define a key motor features.

From motor name plate we can determine many things.All information is very useful when we perform installation,power supply termination,troubleshooting and repairing jobs. read more

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Electric Motor starter method

02/10/2010 by 5 Comments

Basically motor starter designed for asynchronous motors or induction motor is a mechanism  to start and stop the motor operation.It also provides over current,overload and short circuit protection during operation.

The main task is the starter motor to reduce motor starting currents,High inrush current and prevent the motor from operating when suddenly the power supply to be connected.It is for safety and to avoid serious damage of equipment or person.

Motor starter also capable to controlling the forward reverse rotation, speed motor, braking and various other duties as appropriate.In industry,motor starter very common used to control of equipments and application using electric motor for production or any process. read more

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