How To Replace Bearing For Electric Motor?

09/08/2016 by Leave a Comment

With advance technology,we can found the root cause for abnormal sound using Vibration Analysis for rotating equipment.When vibration owner confirm that bearing are defected,we must plan to change or replace a bearing.This time I would like to share video completed method how to replace electric motor bearing.

This is common activities for Electrician to perform bearing replacement during daily routine or turnaround / shutdown.We must ensure all bearing condition for our electrical motor in good performance to prolong bearing life time and can avoid unplanned downtime that can increase maintenance cost. Read More

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How To Disconnect THOMAS Coupling From Induction Motor Hub?

08/08/2016 by Leave a Comment

Hi,

This post I would like to share video how to disconnect or dis-engage THOMAS Coupling from motor hub during maintenance works.In this video,technician plan to replace new bearing for the motor due to abnormal sound detected from bearing.Normally in industry or chemical plant,Thomas Coupling is the one of common application to connect electric motor as a drive and pump as a rotary equipment for the process.

The main reason why Thomas coupling are used :-

  1. To transmit power from one shaft to another, efficiently and effectively.
  2. To accommodate slight shaft misalignment which develop in service.

Thomas coupling application also can protect our equipment from mechanical damage and misalignment. Below several protection when using Thomas coupling :-

1. Absorb shock, vibration and pulsations.

2. Decrease cross load on bearings.

3. Accept load reversals.

4. Minimize backlash. Read More

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How To Use Bearing Induction Heater ?

01/08/2016 by Leave a Comment

This post I would like to share a video How To Use Bearing Induction Heater.Normally when we dealing with bigger motor or pump bearing,it’s quite difficult to install bearing into shaft because a tolerance gap is small.If we use a bearing pusher to install bigger size bearing into shaft,it’s risky and probably percentage of bearing was damage is high.That why we must use bearing induction heater for more safe and easy bearing installation.

In this video, I used old version of SKF bearing induction heater but still working perfectly without any problem.For latest version and model of Induction Heater from SKF,please visit SKF website  Read More

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AC motor protection device

13/08/2012 by 3 Comments

As we know,motor protection is one of the important criteria when we involve for AC motor installation,wiring and termination works.Commonly magnetic contactor,fuse, Molded case circuit breaker (MCCB) and overload relays are used for motor control device of induction motor.

In general ideal for motor protection,it have two basic protections always installed for every motor are Over-load protection and Short-circuit protection.For advance protection we can added for protection against unbalanced supply voltages, under voltage, reverse phase, over temperature and stalling etc. read more

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Braking system for electric motor

16/08/2011 by 1 Comment

Braking application for electric motor are used widely around the world for equipment or machinery such as electric crane,barrel machine,electrical train,lift or for industrial drive.

Basically the braking system for electric motor fundamental is a one mechanism to created retarding torque to stop the motor rotation with sudden or slow stop depend on application system.

Not all electric motor must have braking system.Normally it used for drive application that have lot of energy stored in rotating part for machine or equipment.It also used for driven system that required rapid deceleration and can controlled for accident or emergency situation. read more

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Electro-Mechanical star delta starter

06/08/2011 by 32 Comments

Star Delta starter is the most widely used application especially for Air-compressor and HVAC system.This starter used for 6 or 12 wire for motor terminal depend on electric motor that chosen for the application.

Basically this starter used 3 unit contactor,1 unit timer delay,1 unit overload relay and start/stop button to control the star delta motor.Around the world,it have many types of control circuit design for star delta.

It have different design and technique  for the control circuit but the main objective is same,to reduce starting inrush current.

For safety condition for the star delta control circuit,it include with interlock for star and delta sequence to avoid serious damage for electric motor.That mean during star sequence,contactor for delta cannot energize or vise versa. read more

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Motor cooling

13/06/2011 by 4 Comments

Electric motor generated the heat from inductance process.So the temperature is important factor to ensure the electric motor can operated smoothly without any problem.

Heat can effected the efficiency of motor,maximum load capacity,duty cycle and winding lifespan.That why heat from motor operation must be controlled by motor cooling.

How to control temperature for electric motor?The best method is with motor cooling system.Basically heat generated during motor running will be transferred to the ambient air surrounding. read more

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