How to control the speed of that 775 Redline Motor?


#1

Hi, Good Morning!

We are the first year rookie team. We are building the 2019 Everybot.

Is there anybody can tell me do we have to control the speed of that 775 Redline motor for Intake? Or just connect two connector of this motor to the 12V and ground?

Thank you!
Anne


#2

Umm… Did you mean to connect the motor connectors directly to the 12V and ground? Because that would be illegal.
Here is R36 for reference:

You might not need a real “control” over that motor’s speed, but you still has to connect a motor controller that will control your motor by your code (or else the motor will spin as long as the robot is “on”).


#3

Thank you so much for reply so soon!

When you talk about motor controller, can we use the same controller “The Victor 883 Motor Controller” for all 6 different motors used on The Robonauts’ 2019 Everybot?

775 Redline Motor, Bosch Seat Motor, and four motors for the chassis wheels?


#4

Victor 883’s are about 5 versions old and are no longer legal. You can tell because they are not listed in the list of legal motor controllers in R36A that @Omer_Huly shared. The only legal controllers are the ones on that list.


#5

As @Omer_Huly said, you’ll need to connect the motor through an allowed motor controller. 118 recommends the REV Spark (the BOM actually calls for 2), however it seems like those are out of stock for the season, so if you haven’t ordered them yet you’ll have to search for other options. By Victor 883, I assume mean the Victor SPX’s that came in the kit of parts, as the 883 is more than 10 years old. If so, you will be able to purchase a couple more and use those to control your intake.


#6

Thank you for the clarification!


#7

It looks like you are in North York (Toronto). It may be very beneficial to ask one of the many established teams in the GTA to have a look at your robot to make sure that what you building and intending to build has a good chance of working, will be legal and will be safe. All of the ones I have spoken with are very generous and they all want rookie teams like yours to have a good experience.


#8

This is a really good idea. There’s lots of problem solving methods that look good on a whiteboard, but aren’t a good idea for legality, safety, or efficiency reasons.

Consulting with a Veteran team is a nice way to get all that smoothed out before it’s too late.


#9

The main reason I am suggesting that Anne’s team ask a veteran team to look at what they are doing is there may be problems that they do yet know are problems. Hopefully, these problems will be obvious to someone from a veteran team who can see their robot up close and in person.


#10

FIRST Canada has established drop in hubs for this reason. There’s one hosted by 1241 in Mississauga, not far from North York at all, and they will definitely be able to help out.


Use Bosch seat motor for folding arm
How to control speed of a brushed motor when using a SPARK MAX
#11

You may use the same type of controller for different types of motors, but you may only have one motor on each controller for the heftier motors (~100W+) and only two motors on each controller for the smaller motors. The specific list of how to control electrical devices is given in R37. Row 1 lists the “large” motors and row 2 most of the “small motors”.


#12

Thank you all guys!


#13

We have already asked help from them, they helped a lot! :grinning:

Thank you!