Why is so hard to back drive a small motor with a gearbox?

Does a gearbox increase torque?

Most modern gearboxes are used to increase torque while reducing the speed of a prime mover output shaft (e.g. a motor crankshaft). This means that the output shaft of a gearbox rotates at a slower rate than the input shaft, and this reduction in speed produces a mechanical advantage, increasing torque.

How do you get more torque from an electric motor?

The way to increase the torque that the motor delivers, mechanically, would be:

  1. To increase the diameter of the wire in the windings (which is to say, completely remanufacture the motor)
  2. to have the output shaft coupled to a gear reduction setup, which would lower the final drive rpms, but increase the torque.

How do you increase engine torque?

To increase the torque … that a bit harder. All you can do, electrically (as you can do it mechanically via gears), is to reduce the source impedance to maximise the current that can be delivered for a given stator impedance. Rewind it with more turns of thinner wire.

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Can a planetary gearbox be back driven?

A 10:1 is very easy to back drive. The largest ratio planetary gearbox I have back driven was a two stage 100:1. On a side note, if you are driving the gearbox with a DC or servo motor you will probably have to disable the dynamic braking to back drive it.

Is it better to have more torque than horsepower?

Torque, simply, is the ability of a vehicle to perform work — specifically, the twisting force applied by the crankshaft. Horsepower is how rapidly the vehicle can perform that work. … Because there is generally a limit on how fast you can spin an engine, having higher torque allows for greater horsepower at lower rpms.

Does a gearbox increase power?

It is impossible to increase power in a gearbox. Power is rate at which work is done or energy used and has units of Joules/second. A gearbox can only lose power to bearing drag, gear meshing loss, oil churn and windage. The power output from a gearbox is always less than power input.

How do I calculate torque?

A practical way to calculate the magnitude of the torque is to first determine the lever arm and then multiply it times the applied force. The lever arm is the perpendicular distance from the axis of rotation to the line of action of the force. and the magnitude of the torque is τ = N m.

What happens to speed when you increase torque?

If you increase the torque you increase the speed UNLESS you increase the load. The important thing to remember is that with electric motors there is a back-EMF (a motor is a generator too) which increases with speed and that limits the effective voltage and thereby the current and thereby the torque.

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Which is better torque at low rpm or torque at high rpm?

Running at lower RPMs equates to higher torque and thus lower horsepower, while making higher RPM power outputs less torque and higher top horsepower.

Can you increase torque without increasing horsepower?

If the question is can peak torque be increased without increasing peak horsepower the answer is yes. If you improve the engines performance at at peak torque rpm, then peak torque will go up and peak horsepower may be unaffected. … At any rpm where you increase torque, then horsepower will also increase.

How do you increase torque without increasing speed?

  1. Torque is fundamentally driven by air mass. …
  2. Air mass can also be increased by pressurizing the intake using a super-charger or turbo-charger. …
  3. Another way to increase air mass is to improve volumetric efficiency. …
  4. Torque is also improved by removing as much load from accessories as possible.

Why are planetary gears better?

What are the main advantages of planetary gear motors? Increased repeatability: Its greater speed radial and axial load offers reliability and robustness, minimizing the misalignment of the gear. In addition, uniform transmission and low vibrations at different loads provide a perfect repeatability.

What is difference between transmission and gearbox?

As nouns the difference between transmission and gearbox

is that transmission is the act of transmitting, eg data or electric power while gearbox is that part of a car’s transmission containing the train of gears, and to which the gear lever is connected.

What is a planetary gearbox used for?

A planetary gearbox is a gearbox with the input shaft and the output shaft aligned. A planetary gearbox is used to transfer the largest torque in the most compact form (known as torque density).

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