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​How to balance a Brushless motor?
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​How to balance a Brushless motor?

Views:0     Author:Site Editor     Publish Time: 2021-09-07      Origin:Site

Balancing your electric motor before flying it for the first time makes a massive difference to limiting vibrations and will help to prevent screws and joints loosening, and your plane shaking apart, not to mention increasing the lifespan of your motor. How to balance a Brushless motor?


This passage is going to talk about the followings of balance Brushless motor:

(1) What is balancing Brushless motor?

(2) Things you need to check

(3) Steps to balance your Brushless motor

 

(1) What is balancing Brushless motor?

The dynamic balance of the motor is to adjust the imbalance of the motor rotor. There are two general process methods, one is the weighting method, and the other is the deweighting method. As for the separation of the imbalance, the two-plane separation method is often used. The unbalanced amount caused by the increase and decrease of the two planes is superimposed to remove the partial weight of the rotor to achieve the adjustment of the rotor unbalance.

Brushless motor 

(2) Things you need to check

The following are some things you need to check or change when you are looking for or changing the smooth running of the machine:

1. If you have a universal joint, especially a brushless universal joint, make sure that the vibration does not come from the universal joint motor. In this case, please re-adjust the gimbal controller.

One. Move the pan/tilt stand as close to the CG as possible. CG is the position with the lowest vibration amplitude.

b. Try to install the gimbal harder or more firmly, sometimes the cause of damping (too soft).

2. Do not use cheap plastic props, such as GemFan. They have poor tracking performance and will not maintain their shape under load (and noisy).

3. Do not use cheap carbon fiber propeller clones, such as RCTimer and Foxtech. They track poorly and are often too rigid to work effectively.

4. Make sure that all motor brackets, pillar adapters and gimbal frame screws have been tightened.

5. Check that all motor shafts and support adapters are completely straight. Neither balance nor damping will heal a bent shaft.

6. Check to make sure that each prop is at least within .4 mm (.015 inches) and track from start to finish. Insufficient balance or shock absorption can cure poor tracking props.

7. Balance all props on the magnetic balancer (see "Propeller Balance")

8. Balance motor. Sometimes even expensive servers need to do this, and cheap servers (such as NTM) always need to be balanced.

9. If there is still unacceptable jelly, please consider changing the propeller size and motor Kv to change the vibration frequency.

 

(3) Steps to balance your Brushless motor

Here is how to balance the motor quickly and easily:

Screw your motor onto a piece of wood or turn the Power Pod upside down so that the firewall is in direct contact with a hard surface (in this case a hardwood). This is very important; this is how the vibration is transmitted to the smartphone.

Get a vibrometer app (measure vibration) for your smartphone and set it to run on a hard surface next to the motor.

Tie a tie on your motor bell (remove the propeller first, then balance separately)

Note that it is not very tight. You need to be able to rotate it and finally remove it.

Please note that due to the additional "knob" where the tie clip is located, the tie will cause a weight shift. This is the secret.

If you are using a Power Pod, put some weight on it to prevent it from moving

Speed up the motor and pay attention to the maximum vibration value.

Stop the motor, then rotate the tightening band a quarter turn, and then repeat the vibration measurement.

Repeat until all 4 readings are obtained.

Please pay attention to the lowest reading and the lowest reading at the position of the "knob" on the bell belt. This is how you need to add tape to balance the position of the motor, as I did: after adding this small electrical component After the tape, I tested it again. The vibration is not even recorded on the seismograph app! I don’t have to adjust or add any other tape. To be honest, I am surprised that it has brought such a big change! When I held the Power Pod and started the motor, the difference in front and rear vibration shocked me.


If you wish, you can perform the same 4-digit test again, perhaps 45 degrees (8 rotations) from the previous starting position to make the balance more accurate. That's it, very easy!

 

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