Amit Ika

Boston, working on precise motors and actuators @AIBotHQ

[Amit Ika @amit_ika]

Attention Everyone

FOC has been achieved internally!

That is all.

[Amit Ika @amit_ika]

@theotothe Nope, but not using slip ring due to bus signal integrity. Have you ever had issues doing such a thing?

[Amit Ika @amit_ika]

Upgraded the powerstage 💪honestly for aesthetic reasons mostly. Can add up to 3 motors in the same form factor

[Amit Ika @amit_ika]

@R2rule1 Gearless hub motors are only efficient at moderate+ speeds. This bot needs slower speeds in general

[Amit Ika @amit_ika]

@R2rule1 This bot needs to pull heavy loads. Geared hubmotors are more expensive than these

[Amit Ika @amit_ika]

@nico_andretti_ The PCB has a magnetic encoder. The magnet is driven by internal gears to derive absolute position

[Amit Ika @amit_ika]

@paulcjh D shafts with 3d printing? What material is that?

[Amit Ika @amit_ika]

@milenovic925501 @Hop_Aero This an ssto?

[Amit Ika @amit_ika]

@irvinxyz If you swap hands you still need a hand washing process!

Just have it put on rubber gloves. What is a better solution?

[Amit Ika @amit_ika]

@CH1H160 This great bro. How much did all those actuators cost?

[Amit Ika @amit_ika]

@CH1H160 Need a faster swivel wheel?

[Amit Ika @amit_ika]

@r0wXD Amazing bro.

You think it’s making sounds due to balancing? How’s the torque? Also are the rotor magnets on a steel ring?

[Amit Ika @amit_ika]

@hdubey19 Using stiff copper electric fence wire. Has been rigid no problems yet

[Amit Ika @amit_ika]

Who said DC motors can’t actuate?

[Amit Ika @amit_ika]

@JasperLeuven Thank you bro! You’re working on some cool stuff too looks like

[Amit Ika @amit_ika]

I decided to never use a slip ring so I can have the option of high power and high speed communication protocols - CAN or Ethernet.

The actuator has a 12mm throughole through its entire length so you can run wires right through it. No major wite strain as the hole is in the center axis and wires get twisted if anything. It does not have unlimited rotation to be clear

[Amit Ika @amit_ika]

Well the question is more for large actuators for heavy duty wheels or arm joints for that matter. Brushed DC motors don’t really get play.

Trying to see if cheap brushed motors can actually work long term without brush wear. Our controller has a current sensor so perhaps limiting current spike duration is the key?

[Amit Ika @amit_ika]

@Jack1000k Have to limit rotation to +- 90

But yeah you’d need a new ankle

[Amit Ika @amit_ika]

@psygosling Well the brushes say they cannot. More of a temp solution

[Amit Ika @amit_ika]

@IanPritchard Dayyym