braking single and 3 phase motors
braking single and 3 phase motors
(OP)
Need help with circuits/methods for braking single and three phase AC motors.
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
braking single and 3 phase motors
|
braking single and 3 phase motorsbraking single and 3 phase motors(OP)
Need help with circuits/methods for braking single and three phase AC motors.
Red Flag SubmittedThank you for helping keep Eng-Tips Forums free from inappropriate posts. Reply To This ThreadPosting in the Eng-Tips forums is a member-only feature.Click Here to join Eng-Tips and talk with other members! |
ResourcesWhat is rapid injection molding? For engineers working with tight product design timelines, rapid injection molding can be a critical tool for prototyping and testing functional models. Download Now
The world has changed considerably since the 1980s, when CAD first started displacing drafting tables. Download Now
Prototyping has always been a critical part of product development. Download Now
As the cloud is increasingly adopted for product development, questions remain as to just how cloud software tools compare to on-premise solutions. Download Now
|
RE: braking single and 3 phase motors
http://www.designrouge.com/demo/qds/regen.htm
http://www.ipcresistors.com/db.htm
http://www.cressall.com/PAGES/DYNBR.HTM
http://www.cressall.com/PAGES/DBRLFLT.HTM
http://www.railpage.org.au/ausrail/98april/0138.html
http://www.filnor.com/resistors.htm
http://www.gridcom-mining.com/
etc. for more info.
RE: braking single and 3 phase motors
- Dynamic braking by application of DC to one phase of the motor after disconnecting from the AC supply
- Plugging, by reversing the motor connections to reverse the direction of rotation - needs auxiliary equipment such as zero-speed switches
Additional info is available from the manufacturers websites - check Cutler Hammer, ABB, GE etc.
RE: braking single and 3 phase motors
is it to investigate the characteristics of that motor, or maybe to decrease it's power e.t.c. ?
RE: braking single and 3 phase motors
RE: braking single and 3 phase motors
Not only that but braking may be required in an emergency in certain situations!
Regards,
Lyledunn
RE: braking single and 3 phase motors
Torque, if you need the motor to be locked solid while stationary, this might be the best way to do it.
RE: braking single and 3 phase motors
RE: braking single and 3 phase motors
These are common on machine tools where a person caught up in the rotating parts contacts a micro switch with a rod attached. My own workshop milling machine is equipped and if a sleeve is caught the vertical rod is touched and the milling head stops in less than 30 degrees, the motor may be doing 5 to 10 revs.
The hardware is a changeover switch in the line from the motor starter to the motor. When this changes over it short circuits two of the motor terminals say U & V, and connects a DC capacitor to the terminals V & W. The charge in the capacitor is adjustable and this alters the stopping time. The manufacturers recommend that a machine is not stopped too fast to avoid damage to the gears if the braking is too fierce. The changeover switch is a magnetic switch or contactor tripped by the microswitch. The circuit is on the inside of the cover, it's not too complex. One manufacturer in the UK I think is called Instastop.
James