Volt Nicd
Will these DC motors run off a 7.2V NiCd battery pack?
Will a motor with these specifications No-load ratings: 72 RPM @ 12Vdc 25mA, 144 RPM @ 24Vdc 30mA run off of a 7.2 Volt NiCd battery pack with rating of 2000 mA or less? Will it just run slower than 72 RPM or not run at all? Also I want to use two (2) of these above motors and one (1) of these motors with specs of No-load ratings: 3 RPM, 6 Vdc, 75 mA. 6 RPM, 12 Vdc, 85 mA. Will that work? How fast will the battery pack run down and what if I had less than 2000 mA ( I would like to have them run for at least 3 minutes)? give me some examples. Both of these are gearhead motors by the way. If these do not work could you give some examples of ones that would work?
Generally motors run at a speed proportional to the voltage, so if it is 72 RPM at 12V it will be 7.2V/12V x 72RPM = 43RPM.
It may be different in practice due to different efficiencies, and the load. There is also a threshold for motors, usually a low voltage (probably under 1V in these) where the voltage is not enough to overcome losses so the motor does not start.
The motor current depends on the mechanical load, but in these cases that may be masked considerably by the gearbox reduction and losses. Gearbox losses probably dominate in the load. If the current is 50mA and the battery is 2000mAh capacity, the battery will run this motor for 2000mAh/50mA = 40 hours, so more than adequate. That is, if the current is 50mA under load. A smaller battery also needs to be able to deliver the current required, so this is the current rating of the battery, rather than the capacity rating in mAh. This is not likely to be an issue with rechargeable batteries. Look up battery data sheets for your battery type on the web to learn more about this.
tornado e bay rc boat 9.6 volt 800 ma nicd
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