Where to buy Brushless DC Servo's?

[Maglin]

I'm trying to find some brushless DC Servo's that are not going to break the bank. Something with a peak torque of 4.2Nm and 440w power. Keiling says he is out and doesn't sound like more are coming. Now it's either go with brushed servo's which will work but I'm really wanting to run brushless servo's for the better heat transfer that brushless servo's offer.

Thank you

[Al_The_Man]

I usually use BLDC Tamagawa, which are relabeled in N.A. by Applied Motion.
I have found them to be nice motors.
If you buy off ebay etc, make sure they have encoders, as some have resolvers.
Al.

[Maglin]

@ $400 ea I think I'm going to end up going with a brushed DC Servo. Really $220ea is about as high as I can go. And that is almost 2x the cost of a brushed motor.

The TS4609 BLDC servo motor is what I am looking for in the ways of size and power. Now I need to find them for sale somewhere.

[judleroy]

Maybe something like this Motion Control Products - DMM Technology will work foe you.
Judleroy

[mactec54]

Maglin

Does it have to be DC, these AC servo are better, but you would need there drives as well
Motion Control Products - DMM Technology

It looks like judleroy beat me to it

[mike_Kilroy]

Originally Posted by Maglin @ $400 ea I think I'm going to end up going with a brushed DC Servo. Really $220ea is about as high as I can go. And that is almost 2x the cost of a brushed motor. The TS4609 BLDC servo motor is what I am looking for in the ways of size and power. Now I need to find them for sale somewhere.

how about the drives to run them? have you already got them? If not, then you need to consider price for BOTH motor aND drive... drive can be more expensive than motor depending on details.

We have a lot of NOS brushless servo motors and may be able to supply these but I am concerned about how you would drive them if you dont have the drive scoped out yet.

[Maglin]

I have 6x AMT BD30A8 Drives. They are brush and Brushless drives to be used with Hall sensors. I have CUI AMT encoders already as well. I'm using Mesa boards for breakout from the PC. I was going to go with Brushed servo's but after looking I would rather use 48v Brushless DC Servo's for better heat transfer from the motor and I already have the hardware for DC servo's. I'm pretty sure AC servo's only differ from DC Brushless in the Hall circuit pretty much and DC only running 2 of the 3 fields at the same time where AC drives run all 3 fields at the same time.

[Al_The_Man]

Why have the encoders purchased separately? BLDC motors generally come with encoders as the commutation tracks are on the optical encoder now.
Actual Hall effect devices have not been used for some time.
Al.

[Maglin]

It was for the brushed servo's. I want to run EMC2 in closed loop. I figured the worst case scenario is I hold on to them for a different project or I can sell them for pretty close to what I have into them. I made a decision mid purchasing to switch over to brushless servo's and I have the encoders already. I was thinking that the Hall sensor could be ran to the drive and then an encoder could be ran to the system to close the loop. The BLDC motors Keiling sells looks like their is a shaft to do just this. The way the motor is driven it looks like the hall sensor wouldn't work for positional accuracy. In the end I hope to go brushless since I haven't purchased the PSU yet but if it gets to costly to source the motors I'll just go back to the brush servo's but I would rather use my BLDC drives to actually drive a BLDC servo.