Stepper Motor Selection

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iswarya Participant Join Date: Sep 2011 Posts: 4	Stepper Motor Selection 09/10/2011 11:00 PM
	I am new for stepper motor. I want to rotate the payload of 20 kg. The speed of motor is 400 rpm. what is the torque required to rotate the load? I use 1.8 deg/step. And I rotate 1 step in 750 micro seconds. I want choose correct motor and driver for my application. kindly help me..
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Hendrik Guru Join Date: Jan 2007 Location: Centurion, South Africa Posts: 3921 Good Answers: 97	#1 Re: stepper motor selection 09/11/2011 1:05 AM
	The load on the stepper will depend on the shape of the load (shaft or disk) and the acceleration / deceleration time and profile required. If you need a calculated answer you need to give more detail. What electronics (hardware , firmware and software) do you intend to use as the driver? Be aware that performance expectations sometimes tend to increase over time. __________________ Never do today what you can put of until tomorrow - Student motto
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ronclarke Guru Join Date: Nov 2010 Posts: 507 Good Answers: 3	#3 In reply to #1 Re: stepper motor selection 09/12/2011 9:03 AM
	Me, i would be looking at a gear motor in the proper range instead of a stepper. Ron __________________ I went to Texas A&M, I am proud to be an Aggee. Proud to be an Aggey, Proud to be an Agie.............Proud to have gone to Texas A&M.
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NKT Active Contributor Join Date: Aug 2011 Posts: 18 Good Answers: 1	#2 Re: Stepper Motor Selection 09/12/2011 3:32 AM
	Stepper selection is a complex thing. Stepper torque drops as step rate increases, and quite dramatically. 400RPM is pretty fast for a stepper, especially under that sort of load, so it's going to be big and expensive regardless. At 200 steps per revolution, that's 80,000 steps a second, and for 20Kg load you are talking a lot of driver power. http://www.zaber.com/products/product_detail.php?detail=NM34C20S for example, is the biggest stepper they make, and it tops out at 218.3 RPM, and that's under (I suspect) nearly zero load. 390cm-m of torque means it will just about shift your load. But I don't think a stepper is the right thing, here.
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iswarya Participant Join Date: Sep 2011 Posts: 4	#4 In reply to #2 Re: Stepper Motor Selection 09/12/2011 10:10 PM
	Thanh you for ur reply.actually my problem is reading signal from the sensor. This is mounted on the stepper motor.so I rotate stepper motor to 7.2 degree with in .1 sec, and i hold the motor that position for .2 sec,and i get the reading.my payload weight is 20kg. i use 1.8deg/step.and i redefine my problem from previous posting. so what is the stepper motor torque required? Load type is cylindrical. and also i know about holding torque.sorry for wrong previous post. i am new to stepper motor. how can i select stepper motor for my application
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Hendrik (1); iswarya (1); NKT (1); ronclarke (1)

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