Hi - I have two of these servo motors which will be used to open/close a bicycle brake lever:
I need the motors to have a separate power supply from the arduinos 5v battery.
My setup is mobile so it can't use DC. Can anyone recommend a battery pack which will give sufficient power to both of these motors simultaneously ? I presume I need to stay at 6v so as not to fry the motor. Should I consider having two separate 6v battery packs (one for each servo) ?
Any advice would be great.
Hi,
See THIS PAGE to learn more about Servos.
You need more information, especially current requirements. See this:
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Servo Specification:
Mechanical Specification:
Item Specification
Size 40.419.937.5mm
Weight 58g
Gear type 5 Metal Gear
Limit angle 180°±5°
Bearing DUAL BB
Horn gear spline
Horn type Metal
Case Engineering plastics(Polyamide)
Connector wire FP: 240mm±5mm JR: 300mm±5mm
Motor DC motor
Splash water resistance No
Electrical Specification:
Item Specification
Operating voltage 4.8V
Idle current 5mA
No load speed 0.17sec/60°
Running current 350mA
Peak stall torque 9.0kg.cm
Stall current 1500mA **** NOTE THIS
Control Specification:
Item Specification
Command signal Pulse width modification
Amplifier type Digital controller
Pulse width range 500~2500usec
Neutral position 1500usec
Running degree 180±2°(when 500~2500usec)
Dead band width 4 usec
Rotating direction Counterclockwise (when 500~2500usec)
-----------------( END COPY )----------------------
More info from the Servo Database here:
If you can afford the weight of a small 6v lead acid battery then that should be suitable.
A lot depends on how much energy the servos are expected to use. If they are only at high power for a second or two every few minutes then the total energy consumption will be small.
I'm not sure I would like to rely on servos to control the brakes on a bike with me riding it.
...R
[ An aside: its a servo (aka servo mechanism), not a servomotor, servomotors are like this: https://www.alibaba.com/product-detail/5kw-ac-servo-motor_60640266412.html?s=p ]
Its rated at 10kgf-cm torque, ie 1Nm is sensible units, which isn't much at all to operate a brake
level. I think a linear actuator is more what you need. Have you measured the forces / torques needed?
Hi thanks for the feedback. The brakes are on a wheelchair not a bike! The wheelchair will be pushed by a user wearing a VR headset. I'm researching physical exertion levels in immersive video games. I wanted to be able to control the resistance of a physical object that users would have to move around a room. I wanted to be able to adjust the objects resistance remotely, wirelessly and in increments. I looked at lots of options...at one stage I was even going to link a pressure sensor to a bomb disposal robot but in the end I went with wheel friction.
I've tried the servos on a kids bike brake lever and it did the job but that was using DC. So I'm hoping a separate 6v battery will provide enough power.
MarkT- thanks for letting me know about the correct terminology... Out of curiosity..can you recommend a battery powered linear actuator model with greater torque than the servos I'm using or do all models require dc?
I just found this actuator so ignore the last section in my previous post
http://www.robotshop.com/en/l16-actuator-50mm-631-6v-rc-control.html