I’m working on a project that uses 18 actuators, it may sound crazy, anyways the designs have been developed in CATIA and the present design uses cables and pulley systems in a closed loop for bidirectional motion. The actuators would be stacked in separate unit. The major flaw in this design is the effect of one cable extension on the other and also the length between the actuators and the joint.
I really wanted to know whether there is any motor that could be placed directly at the joint location. The max dimensions are 20mm length and 15mm diameter (the smaller the better). But at the same time it should have considerable torque that is at least 5-6 kgcm. Also it should have position control with at least 1 degree accuracy. The angle variation for each actuator would be 0 degree to 130 degree. The motor speed should be not lesser than 0.15s/60 degrees. Once the motors have reached the required angle it should lock onto this position.
As I did mention there are 18 actuators, is there any single driver to control all the motors individually or does it need separate drivers.
Please do help!!!
Can you provide some additional information about the project? Do you need to specify the angle of rotation? You indicate “joint” - is this a legged robot? Without more information, this sounds like something a servo could handle:
robotshop.com/en/servo-motors.html
robotshop.com/en/smart-servo-motors.html
The type of controller depends on the actuator you select.
Hey there!!!
Its actually a prosthetic arm that I’m working on.
So I wanted to know whether there’s any motor which can be housed within the finger cavity. The inner diameter of the cavity is 20mm diameter and has a length of 25mm.
Each finger has three joints. At the joints the motors should drive the next part using bevel gears. The input to the driver will be the angle and it has to rotate to that angle and lock in position.
Anyways thanks for the reply!
Consider a nano Hitec servo:
robotshop.com/en/hs-40-nano- … motor.html
robotshop.com/en/hs-35hd-ult … motor.html
robotshop.com/en/hs-45hb-mic … motor.html
Alternatively, perhaps you can figure out a way to use a pico linear servo
robotshop.com/en/vs-19-pico- … servo.html
The best way to save room in each finger is to place the actuators on the back of (or inside) the hand and connect them to each joint via pulleys or a mechanical structure.
