Dc motor series field with a regenerative dc drive
Dc motor series field with a regenerative dc drive
(OP)
Can a dc motor with a series field be used on a FlexPak 3000 regen drive? Or any regen drive for that matter?
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 |
Dc motor series field with a regenerative dc drive
|
RE: Dc motor series field with a regenerative dc drive
If, on the other hand, you mean a standard DC motor with a series field, then you have to tell if the series field is there to stabilize speed aka negative compounding or if it is there to improve load sharing, positive compounding, when several motors run off a common DC source.
In the former case (stabilizing), the series field weakens the main field when motoring and strengthens the main field when braking.
Strengthening the field when braking means increasing the EMF and that can make the thyristor rectifier trip on commutation error (meaning fuse and collector break down) if you are close to top speed.
If the series field is there to improve load sharing, increased load means increased field strength when motoring and reduced field when regenerating. That would be non-critical.
Answer: It depends. As usual.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Dc motor series field with a regenerative dc drive
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Dc motor series field with a regenerative dc drive
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Dc motor series field with a regenerative dc drive
RE: Dc motor series field with a regenerative dc drive
Keith Cress
kcress - http://www.flaminsystems.com
RE: Dc motor series field with a regenerative dc drive
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Dc motor series field with a regenerative dc drive
Cumulative compounding is for better starting torque and maintaining a steady speed.
Differential compounding is rarely used since under overloads, the working flux will be reduced, the motor will tend to race taking in a still larger current. The point may be reached where the series field will overpower the shunt and the motor will reverse.
RE: Dc motor series field with a regenerative dc drive
Do you mean the motor will reverse while it is motoring? Or could it reverse after the motor is stopped?
RE: Dc motor series field with a regenerative dc drive
RE: Dc motor series field with a regenerative dc drive
The motor reversal would depend on how powerful the differential series field is as compared to the shunt field and how much was the load current.
Is the shunt field supply switched off during regenerative braking ? That could explain the motor reversal.
RE: Dc motor series field with a regenerative dc drive