I repair treadmills and occasionally the motor causes the controller to fail. I use a 20v dc source with no load for the test.I have determined thru testing many motors of the same specs that a current draw above .75 amps will cause speed regulation issues and if it goes above 1 amp the controller may fail upon startup. A new motor will typically read .53-.60 amps. I also listen for bearing noise to eliminate that. My question is because I run into many motors I haven't tested and don't know what the "good reading should be can I determine that by any info off the label. Unfortunately some motors have only he HP and Wattage rating. For example the label says 2.8hp/2089 watts. Thanks in advance for your time to reply Jon
Dc motor amp draw based on HP and watts
dcmotor
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Best Answer
Horsepower (hp) is a unit of measurement of power. The mechanical horsepower, also known as imperial horsepower, of exactly 550 foot-pounds per second is approximately equivalent to 745.7 watts.
The equation is
\$ \Large I= \frac {P}{V}\$
\$ Current (ampere) = \frac {Power (watt)} {Voltage (volt)}\$