A
Abe
- Jan 1, 1970
- 0
Hi,
I was working on a robot which has a crane like lifting assly. I
am using a motor to windup the wire which is attached to the weight.
Now I have noticed that if the motor terminals are shorted, the motor
cannot be rotated by its shaft as easily as it can be without its
terminals shorted. I was kinda hoping that I could use this property
of the motor for holding a load at some height. I have been suggested
many mechanical alternatives, but I find the motor soln a better one.
I guess that since the motor is acting like a generator (mechanical
input at shaft and terminals are shorted) the value of load that can
be held depends on the torque generated in opposition to the input.
Now how can I calculate this value of torque. Is it same as the
stall-torque or the starting torque (as specified in the motor's
datasheet) or is it something different. I am using a 12v DC motor
(2400rpm geared down to 120rpm) and a 1cm dia pulley to wind the
string on.
Thanks,
Abhijit Karnik
I was working on a robot which has a crane like lifting assly. I
am using a motor to windup the wire which is attached to the weight.
Now I have noticed that if the motor terminals are shorted, the motor
cannot be rotated by its shaft as easily as it can be without its
terminals shorted. I was kinda hoping that I could use this property
of the motor for holding a load at some height. I have been suggested
many mechanical alternatives, but I find the motor soln a better one.
I guess that since the motor is acting like a generator (mechanical
input at shaft and terminals are shorted) the value of load that can
be held depends on the torque generated in opposition to the input.
Now how can I calculate this value of torque. Is it same as the
stall-torque or the starting torque (as specified in the motor's
datasheet) or is it something different. I am using a 12v DC motor
(2400rpm geared down to 120rpm) and a 1cm dia pulley to wind the
string on.
Thanks,
Abhijit Karnik