Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

3-Phase AC motor- blocking rotor

Status
Not open for further replies.

xirix

Full Member level 2
Joined
Jun 26, 2001
Messages
123
Helped
3
Reputation
6
Reaction score
1
Trophy points
1,298
Location
Romania
Activity points
939
Did anyone know (as principle) how to block the ax of a 3-phase motor using the PWM signals?
It is needed by a emergency stop of rotor movement.
Thanks
 

FANT

Advanced Member level 1
Joined
Feb 27, 2002
Messages
415
Helped
52
Reputation
104
Reaction score
37
Trophy points
1,308
Location
Italy
Activity points
3,653
Following the European rules about machines, for an emergency stop you cannot use any electronic system but only a brale ( breaks in case of missing power ).
It can be helped by electronics, but not electronics only.

Mandi
 

nesquik

Newbie level 3
Joined
May 6, 2003
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
40
If you want to brake the AC motor you need to inject a DC current into stator.
This is as you fix a vecto in oune position and force the motor to follow this vector.
The induced current on the rotor perform resistive losses on it then take in account that before another braking action you need to cool enugth the rotor.
Bye.
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top