Does a planetary gear system affect the torque felt by an electric motor?

In summary, the planetary gear system will cause the motor to "feel" less torque due to the decreasing rotation speed, but the motor will still experience the torque from the drum load. The final torque on the motor can be calculated by dividing the drum load torque by the diameter of the drum and the gear ratio. This concept is similar to a car experiencing drag or going up a hill. The torque felt by the motor will be different from the torque felt by the load, with the difference being equal to the gear ratio. This difference in torque is taken out by the gear box case.
  • #1
ENgez
75
0
lets say i have an electric dc motor and i connected its shaft to a planetary gear system. this planetary gear systems last stage's ring (outer rim) spins a drum. this drum feels an outer torque T as a consequence of loads. my question is motor will feel torque T, becuase i read that the planetary gears increase transmitted torque (the engine will "feel" less torque) as result of decreasing rotation speed
 
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  • #2
What engine are you referring to?
 
  • #3
a simple dc engine that supplies torque using a shaft .it has no built in gearbox.
 
  • #4
I thi
 
  • #5
I think your motor will indeed "Feel" this torque T from load. It will be divide by the diameter of the drum, then divided by the gear ratio to get the final torque on the motor.


I do believe that if the motor and gearing are appropriate this drum load torque will be "seen" by the motor as work to do, nothing special. For example, if this were a car, it would be similar to drag or going up a hill.


drum+torque.jpg
 
  • #6
Motor and load will not see the same torque. They will be different by a factor equal to the gear ratio. If you are trying to balance the sum of the moments in a free body diagram, then don't forget that the difference on torque is taken out by the gear box case.
 

1. What are motor and planetary gears?

Motor and planetary gears are types of gears that are commonly used in mechanical systems to transmit power and motion between two or more shafts. They consist of multiple gears arranged in a specific way to increase or decrease speed and torque.

2. How do motor and planetary gears work?

In a motor gear system, the power is transmitted from the driving gear (or motor) to the driven gear, which then rotates at a different speed. In a planetary gear system, the power is transmitted through a central gear (sun gear) to multiple outer gears (planet gears), which rotate around the sun gear and also rotate on their own axes.

3. What are the advantages of using motor and planetary gears?

The use of motor and planetary gears allows for a compact and efficient transmission of power and motion. They can achieve high gear ratios in a small space, and also provide smooth and precise motion control. They are also highly durable and can handle high torque loads.

4. What are some common applications of motor and planetary gears?

Motor and planetary gears are commonly used in various industrial machines and equipment such as robots, CNC machines, and conveyor belts. They are also used in vehicles, including cars, trucks, and motorcycles, to transmit power from the engine to the wheels.

5. How do I choose the right motor and planetary gears for my application?

The selection of motor and planetary gears depends on various factors such as the required speed and torque, the space available, and the type of motion control needed. It is important to consult with a mechanical engineer or gear specialist to determine the best gears for your specific application.

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