Hello all,
I am build a 2x72 belt grinder using a DC treadmill motor. The 1.5 hp motor I have is rated at 90V on the tag. No RPM is given.
I am driving it with an 120V SCR speed control fed through a bridge rectifier. I get a maximum of 108V at present. This gives me a motor speed of 6700 rpm. If i drop back to 90V, I get about 5600 rpm.
My question is twofold, I suppose.
1st, I need to determine if I want to run the motor above the rated voltage. 18V over is 20%. I guess I would be comfortable with 10%, but not sure about 20%. Now, this would be design maximum speed, and not necessarily my most common speed I suppose. But I would still want to have comfort running at maximum occasionally.
2nd, would be the belt speed range I want. I need to fabricate my drive pulley still. I have seen 5,000 to 6,000 sfpm as an upper range limit for premium belts. Is this a good target to hit?
I want to due most of my grinding in the meat of my torque curve on the motor, but can only make assumptions as to where that is.
Thanks
I am build a 2x72 belt grinder using a DC treadmill motor. The 1.5 hp motor I have is rated at 90V on the tag. No RPM is given.
I am driving it with an 120V SCR speed control fed through a bridge rectifier. I get a maximum of 108V at present. This gives me a motor speed of 6700 rpm. If i drop back to 90V, I get about 5600 rpm.
My question is twofold, I suppose.
1st, I need to determine if I want to run the motor above the rated voltage. 18V over is 20%. I guess I would be comfortable with 10%, but not sure about 20%. Now, this would be design maximum speed, and not necessarily my most common speed I suppose. But I would still want to have comfort running at maximum occasionally.
2nd, would be the belt speed range I want. I need to fabricate my drive pulley still. I have seen 5,000 to 6,000 sfpm as an upper range limit for premium belts. Is this a good target to hit?
I want to due most of my grinding in the meat of my torque curve on the motor, but can only make assumptions as to where that is.
Thanks