Sites: GlobalSpec.com | GlobalSpec Electronics | CR4 | Electronics360
Login | Register
The Engineer's Place for News and Discussion®

Previous in Forum: Relation Between Motor and Load GD2   Next in Forum: CDF of Motor
Close

Comments Format:






Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







2 comments
Anonymous Poster

Hot and Cold Condition of Motor

03/30/2010 5:46 AM

What you mean hot and cold condition of motor?

Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".
2
Guru

Join Date: Feb 2009
Location: Houston, USA
Posts: 972
Good Answers: 245
#1

Re: Hot and Cold Condition of Motor

03/30/2010 9:34 AM

Hot and Cold condition of the motor refer to state of the temperature of the motor as a whole (especially the stator and rotor winding) when the motor is started.

Cold condition: When the temperature of the motor stator and rotor winding is at ambient temperature, the motor is considered 'cold condition'. If a motor remains stopped for relatively long period of time (generally half an hour - depends on motor size), it is considered cold condition and the start of a motor at this condition is called cold start.

Hot Condition: When the temperature of the motor stator and rotor winding is above the ambient temperature, the motor is considered 'hot condition'. If a motor is already hot from either an initial start or a period of recent full-load operation, it is considered hot condition and the start of a motor at this condition is called hot start. The hot start of the motor further raises its temperature to a higher level due to the subsequent restart and cause the motor damage. The motor protection relay generally prevents motor damage by limiting the number of start per hour and/or from further hot starting of the motor.

See this link for more detail:

http://findarticles.com/p/articles/mi_qa3726/is_200806/ai_n27900075/ (click Next to move forward)

- MS

__________________
"All my technical advices in this forum must be consulted with and approved by a local registered professional engineer before implementation" - Mohammed Samad (Linkedin Profile: http://www.linkedin.com/in/msamad)
Reply Good Answer (Score 2)
Member

Join Date: Mar 2010
Posts: 6
#2
In reply to #1

Re: Hot and Cold Condition of Motor

03/31/2010 3:30 AM

sir, Thanks for your information ,further i want to ask you that,is bi-metal relay, in the starter is sufficient to prevent the motor hot condition start?,or we have to use a thermistor in windings?

Reply
Reply to Forum Thread 2 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Previous in Forum: Relation Between Motor and Load GD2   Next in Forum: CDF of Motor
You might be interested in: Hot Mirrors and Cold Mirrors, Cold Forming and Cold Heading Services