Do I need a soft starter?
Do I need a soft starter?
(OP)
I am presently on a project which requires the installation of a DC motor onto an existing structure. The motor will be speed-controlled by an axial potentiometer on a dancer roller. The machine at the other end will be starting and stopping rather frequently. Will I need a soft starter for my motor?





RE: Do I need a soft starter?
The isssue that comes to mind for me with respect to frequent starting and stopping of the DC motor is cooling. Depending upon the duty cycle for your machine, a self cooled motor may not be adequate, you may need a blower cooled or separately ventilated motor.
RE: Do I need a soft starter?
1. DC motor kind
2. HP Size
3. Voltage
4. Controls
5. What kind of project it is
6. Whatever other may be to your concern
RE: Do I need a soft starter?
In todays times however, many folks are considering Vector controlled AC drives in place of DC. Many Winder applications are now commisioning of these drives and they are finding that the percentage of Speed regulation and response is quite adequate for their needs. I have seen several Allen Bradley Force drives installed and not only work well, but last.
RE: Do I need a soft starter?
http://www.sprint-electric.com/fram2.htm
for differences in dancer rollers:
http://www.boomasia.com/edan-r.htm
http://www.megtec.com/products/dsa.htm
etc. for more info
It appears that the higher horsepower DC motor may require smoother (softer) start than small rugged servo motor.
RE: Do I need a soft starter?
Reference:
Gordon R. Slemon, "Magnetoelectric Devices, Transducers, Transformers, and Machines," John Wiley & Sons, Inc., 1966,
page 292 states:
"It is only the very small machines with relatively high armature resistance that rated voltage can be applied suddenly to the armature at standstill without exceeding the maximum transient current that the commutator can switch without damage. For larger machines, either the rate of change of the armature voltage ea must be limited, or additional resistance must be added to the armature circuit."