On that last comment, yeah in the end the customer put the rheostats back on and started the motors with one of the lower resistance steps and removed it once running. This was just a quick fix with the intention to actually install proper squirrel cage down the line.
Interesting, so basically if by luck or be pre spinning the motor the slots are aligned the motor will start fine. If they are not well aligned the starting will be that poor that even unloaded it cannot get itself moving. Essentially creates deadspots.
Yeah so that's the bit that gets me, so having resistors on the rotor effect more than just the starting torque or is simply that with such a large starting torque the WR motor overcomes this stator/rotor slot arrangement?
Hi all,
Came across this scenario a few weeks back. Customer's plan was to convert some old wound rotor motors on liquid rheostats to a squirrel cage mimic on soft starters. So we short out the windings in the motors terminal box and hook them up to a soft starter. Hey presto! we start them...
