Trying to make sure that calculations are correct. Motor calculation.
Trying to make sure that calculations are correct. Motor calculation.
(OP)
Hello I want to make sure that the calculations I am doing are correct.
I am trying to move a refrigerator wirelessly (I know, please don´t ask why).
This refrigerator weighs 70Kg and I´m trying to figure out if I use 2 or 4 motors.
Asumming I will use 4 motors, those 70Kg will be distributed for the 4 motors.
The static friction coefficient is 1. I have attached an image
https://drive.google.com/file/d/0BwBiiNcJ8DICQS13T...
With wheels with 4cm radius I have calculated about 7Nm of torque.
Also the RPM is about 500.
Are my calculations ok? Thank you in advance
I am trying to move a refrigerator wirelessly (I know, please don´t ask why).
This refrigerator weighs 70Kg and I´m trying to figure out if I use 2 or 4 motors.
Asumming I will use 4 motors, those 70Kg will be distributed for the 4 motors.
The static friction coefficient is 1. I have attached an image
https://drive.google.com/file/d/0BwBiiNcJ8DICQS13T...
With wheels with 4cm radius I have calculated about 7Nm of torque.
Also the RPM is about 500.
Are my calculations ok? Thank you in advance





RE: Trying to make sure that calculations are correct. Motor calculation.
I cannot open the attachment.
RE: Trying to make sure that calculations are correct. Motor calculation.
RE: Trying to make sure that calculations are correct. Motor calculation.
RE: Trying to make sure that calculations are correct. Motor calculation.
If so, you will be much, much more stable if the wheel are not UNDER the refrigerator platform, but are outside of the platform so they have a larger moment arm against acceleration and turning over.
Figure walking speed.
1/2 meter/sec horizontal speed = 50 cm/sec.
From a 4 cm radius wheel = 24 cm circumference = only want a 2 rev/sec or 120 rpm
RE: Trying to make sure that calculations are correct. Motor calculation.
Another consideration is how you intend to steer and/or brake the vehicle. 7N-m at each of 4 wheels at 500 rpm is a bit less than 2hp. But the 8cm dia wheels turning at 500 rpm is 410 ft/min, which is a pretty good pace.
RE: Trying to make sure that calculations are correct. Motor calculation.