Help IFIRobotics THOR SC

[Bruno Inácio]

Hello

I'm doing tests with a IFIRobotics THOR Spin Controller and when I turn on the motor without charge(without wheel on the floor), the motor run normally but when I put charge (wheel on the floor), the motor begin to fail......and doesn't load the charge. And when I turn on the motor direct on the batery the charge is loaded.

The weight of the charge is 46.2970751 pounds.
The motor is 24V and 120A continuos.

How can I do this ?????

Thank a lot........

[Adam Richards]

Originally Posted by Bruno Inácio

Hello

I'm doing tests with a IFIRobotics THOR Spin Controller and when I turn on the motor without charge(without wheel on the floor), the motor run normally but when I put charge (wheel on the floor), the motor begin to fail......and doesn't load the charge. And when I turn on the motor direct on the batery the charge is loaded.

The weight of the charge is 46.2970751 pounds.
The motor is 24V and 120A continuos.

How can I do this ?????

Thank a lot........

I believe the Thor Spin Controller is to be used for robot parts such as weapons like spinning saw blades, with little to no load on the motor.

Victor 883, Thor 883 Spin Controller were developed for Robot Weapons. The Spin Controller is a Victor 883 SC (90A) or Thor 883 SC (150A) speed controller reprogrammed to function as a single direction spinning-mass controller. Both the forward and reverse components are dedicated to a single direction.

I suggest switching to a Victor speed controller (such as the Victor 885 if you need 24V) if you're going to be using it to drive a wheel motor.

[Rohith Surampudi]

ditto on the victor, The THOR Speed controller is indeed(as far as i Know) meant to be used for revolving objects with little or no load, under the strain of resistance something is likely to break, if the name speed controller confused you from its relation to remote control cars and such, it is the same principal, its just this one is probably not able to handle the load. Try the IFI website, they have a good selection of Victors, sorry if i wasn't more helpful


-RS

[Kevin Sevcik]

Adam and Rohith,

I'm inclined to strongly disagree. The Thor 883 SC is specifically designed to handle ludicrously high currents and current surges. 150A to be specific, and surges of 300A for less than a second. If that's not beefy, I don't know what is. If his motor draws only 120A continuous at stall, then the Thor should just laugh it off. The only reason it's supposedly designed to handle spinning weapons is because it's only capable of one direction, no reverse.

Bruno,

There's obviously a little translation difficulty here, but I'll try to help.

First, are you sure you've wired the motor correctly? Wiring is completely different from a normal Victor. The User's Guide shows that you wire + and - on the battery to + and - on the battery side of the Thor. Then + and - on the Motor side of the Thor BOTH go to ONE side of the motor. The other side of the motor should be connected to + on the battery.

Second, are you sending the motor a full forward signal of 254 from your program? Anything less would tend to weaken the motor.

Third.... I'm out of ideas for the moment, but if you can better describe what you're doing, it might help.

[billbo911]

Originally Posted by Kevin Sevcik

First, are you sure you've wired the motor correctly? Wiring is completely different from a normal Victor. The User's Guide shows that you wire + and - on the battery to + and - on the battery side of the Thor. Then + and - on the Motor side of the Thor BOTH go to ONE side of the motor. The other side of the motor should be connected to + on the battery.

Even this statement is a little confusing, but correct. I'll use the "A picture paint a thousand words" approach. See the pic. below.

[Al Skierkiewicz]

Bruno,
If you have wired the SC correctly, (thanks Bill for the great catch and picture) then what you describe is a typical bad crimp or loose connection type of failure. When the current demand is high (wheel loaded) then the series resistance of a bad connection limits the current supplied to the motor, i.e. low power. Check that all connections are good, tight and soldered/crimped. Check that the breaker feeding that branch circuit is of the correct type and that the SC is showing normal LED function for your data control.