jim314159
Aluminum
- Joined
- Jun 9, 2011
- Location
- Atlanta, GA, USA
Hi Folks,
I'm considering reusing the existing 3HP Reliance shunt wound DC motor that came with my machine and just mating it with a modern DC Drive that can be obtained for a few hundred dollars. Before I spend on the DC drive, I'd like to make sure the motor is good!
I read up on all the electrical tests I can do without having a megger, and all looks good save for some odd behavior I'm seeing on the commutator bars.
AFAIK each pair of bars separated by 180* should have the same resistance, and each neighboring set of bars should have no continuity. When I started to measure, I discovered that 100% of the commutator bars are continuous to one another (but none of them are continuous to ground or the lamination stack).
Is the armature hooped, or am I missing something peculiar about the construction of this specific model? Photo of nameplate and armature are below. The commutator bars I am testing are at bottom, obvs.
--jim
I'm considering reusing the existing 3HP Reliance shunt wound DC motor that came with my machine and just mating it with a modern DC Drive that can be obtained for a few hundred dollars. Before I spend on the DC drive, I'd like to make sure the motor is good!
I read up on all the electrical tests I can do without having a megger, and all looks good save for some odd behavior I'm seeing on the commutator bars.
AFAIK each pair of bars separated by 180* should have the same resistance, and each neighboring set of bars should have no continuity. When I started to measure, I discovered that 100% of the commutator bars are continuous to one another (but none of them are continuous to ground or the lamination stack).
Is the armature hooped, or am I missing something peculiar about the construction of this specific model? Photo of nameplate and armature are below. The commutator bars I am testing are at bottom, obvs.
--jim