DC Gearmotor Data: CMR 121A100/183

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Basic DC Gearmotor Data -Standard Part Numbers
1. This rating is for gearbox only. To determine output of any motor gearbox combination, multiply motor torque by the torque multiplier for that ratio. Do not use the .250 dia. shaft for continuous duty above 700 oz. in. Consult factory. 2. Torque multiplier ratio is the gear ratio multiplied by its efficiency. ** Consult factory when exceeding 1250 oz. in. t. For applications below 200 oz. in., continuous duty, lengths La and Lb can be reduced by .210 in.

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BASIC CMR ARMATURE DATA ³  

3. For complete CMR motor data and tolerances see Bulletin 120A100/101. * Intermittent duty at rated load; consult factory for ratings for your application.

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HOW TO SELECT A UNIT

The complete part number must include a standard CMR gearmotor part number (above) plus an applicable CMR armature dash number from the basic motor data chart (above). Use the following trial and error technique to start:

1. Assume motor speed of 10,000 RPM and divide it by the required output speed to get approximate ratio.
2. From ratios charted above, select closest one.
3. Check maximum torque rating of that ratio with your actual requirement. Adjust ratio and motor speed up or down as needed.
4. Calculate output torque by multiplying motor torque by the "torque multiplier" of the ratio selected.
5. Select armature from voltage, load and speed required.
6. Select shaft size and flange configuration for your application and determine correct gearmotor part number.

 

ORDERING

Order by standard part number (example: 121A130-11), making sure to include the armature dash number. Note any modifications as exceptions to the standard.  
 

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