| Electronics > Beginners |
| synchronous motors - Can i have this in English please |
| << < (3/5) > >> |
| ArthurDent:
Although all the posts seem to be related to methods to switch from one type of motor with high starting torque to another type once running, here is another explanation using 3-phase power that is very close to the original post that might be clearer. https://www.allaboutcircuits.com/textbook/alternating-current/chpt-13/wound-rotor-induction-motors/ |
| Simon:
--- Quote from: Benta on December 28, 2018, 05:56:03 pm --- --- Quote from: Simon on December 28, 2018, 05:45:08 pm --- --- Quote from: Benta on December 28, 2018, 05:40:44 pm ---Actually, it gives you a squirrel cage motor. But it doesn't matter. In synchronism there is no slip, and the squirrel cage is completely out of the picture. --- End quote --- Well that is what i said but they are attempting to describe a motor that uses the same winding's as the induction start and synchronous rotor coils. The using separate winding's/cages is old hat by this section. --- End quote --- No. There are two rotor winding systems. One is the induction part, the second is the exciter. Close to synchronous operation the induction rotor coils are switched to squirrel cage operation. At the same time, the exciter is switched in and pulls the motor to synchronous revs. The squirrel cage rotor part is then no longer operative or needed. --- End quote --- No, read it again. Remember these people are not exactly the masters of clarity. I think the short circuiting is referred to two of the slip rings converting the 3 phase rotor winding into one (virtual) DC winding. No there are not 2 winding's in this case of the schematic. Half way through the last section they stop talking about the dual type and explain how a wound rotor can be used as both wound induction winding's and the DC synchronous rotor winding's. |
| Benta:
You are right, indeed only two windings are shorted together. I found a better article where the switching part is clearer: https://electricallive.com/2015/03/synchronous-induction-motor.html |
| ahbushnell:
--- Quote from: Benta on December 28, 2018, 06:32:43 pm ---Wonderful! Now we have two subjects in one thread. Talk about thread pollution (or riding a hobby horse). --- End quote --- They should add a fork function to this forum. :) |
| Simon:
There is a split, if by fork you mean multiple threads in threads please NO! |
| Navigation |
| Message Index |
| Next page |
| Previous page |