Body: <p>I have four Technic Large Motors, all connected to a technic hub. I am using the motor to turn some large propellers and the hub is powered by six 1.5 V (maybe less) batteries depending on the brand. So each motor would get 9V, but the current would be 1/4 of a certain value. I want to increase the power supplied to each motor while using the same technic hub. I remember that according to the manual, the hub can handle 12V at most. Is this true? Can we increase the input voltage by connecting a more powerful battery to your hub?</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-05-13T00:04:15.857Z
Comments.Text: The voltage doesn't drop by by a factor of 4 because 4 motors are powered, that's not how voltage works.  I'd urge you to educate yourself in some basics of electric circuitry like ohms law, parallel and series circuits, electric power, etc... before considering the experiments you have in mind, for the safety of your Lego and your own safety... Perhaps you are still in school and your physics teacher can help you ?
Comments.UserDisplayName: Michael Verschaeve
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-05-13T16:03:13.940Z
Comments.Text: I forget the hub connect the motor in parallel. But still, the current in 1/4 of what it would be if there is only 1 motor connected to to hub. So the power to four motor is 1/4 of the power to 1 motor though?
Comments.UserDisplayName: user39178
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-05-13T16:40:48.393Z
Comments.Text: If the hub can supply X Amperes of current at most (be it either the maximal sustained current or a short term burst value), then with four motors attached any of them can receive at most X/4 Amperes simultaneously - that part is correct. But each type of motor has its own maximum current it can consume, which is unrelated to X - might be lower than X/4, or between X/4 and X. (For Control+ L motors the stall current is 1.4A, but I couldn't find the current the Hub can support either per port or the total)
Comments.UserDisplayName: zovits
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-05-13T23:02:28.137Z
Comments.Text: Still quite incorrect. If the power consumption of your motors is below what the battery can supply, you will see NOT see a current drop of a factor 4. Current and hence power to each motor will be somewhat less because of internal resistance of the battery but depending on your motors resistance it could be hardly noticeable... Only thing you can say with certainty is that your battery will drain 4 times faster.
Comments.UserDisplayName: Michael Verschaeve
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-05-15T23:24:16.107Z
Comments.Text: Anyways, can I link up 3 9V batteries in series and connect them to the hub without it burned up?
Comments.UserDisplayName: user39178
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-05-16T15:56:19.220Z
Comments.Text: No, in series that would mean 27 V, I read in some article that the motor controller IC can only handle 10.5 V. So that's the best you can do, i.e. add another 1.5 V battery to your original 6 in series, which buys you about 17% more power, I don't think it's worth the risk.
Comments.UserDisplayName: Michael Verschaeve
Tags: <technic><motor><electronics><powered-up><battery>
Title: How to increase the voltage supplying to technic motor through the Technic hub?
UserDisplayName: user39178
ThreadText: # How to increase the voltage supplying to technic motor through the Technic hub?
  
  (Asked by: username_0 on 2021-05-12)
  
  I have four Technic Large Motors, all connected to a technic hub. I am using the motor to turn some large propellers and the hub is powered by six 1.5 V (maybe less) batteries depending on the brand. So each motor would get 9V, but the current would be 1/4 of a certain value. I want to increase the power supplied to each motor while using the same technic hub. I remember that according to the manual, the hub can handle 12V at most. Is this true? Can we increase the input voltage by connecting a more powerful battery to your hub?
  
  **Tags:** technic, motor, electronics, powered-up, battery
  
  > **Comments:**
  > **username_1**: The voltage doesn't drop by by a factor of 4 because 4 motors are powered, that's not how voltage works.  I'd urge you to educate yourself in some basics of electric circuitry like ohms law, parallel and series circuits, electric power, etc... before considering the experiments you have in mind, for the safety of your Lego and your own safety... Perhaps you are still in school and your physics teacher can help you ?  
  > **username_0**: I forget the hub connect the motor in parallel. But still, the current in 1/4 of what it would be if there is only 1 motor connected to to hub. So the power to four motor is 1/4 of the power to 1 motor though?  
  > **username_2**: If the hub can supply X Amperes of current at most (be it either the maximal sustained current or a short term burst value), then with four motors attached any of them can receive at most X/4 Amperes simultaneously - that part is correct. But each type of motor has its own maximum current it can consume, which is unrelated to X - might be lower than X/4, or between X/4 and X. (For Control+ L motors the stall current is 1.4A, but I couldn't find the current the Hub can support either per port or the total)  
  > **username_1**: Still quite incorrect. If the power consumption of your motors is below what the battery can supply, you will see NOT see a current drop of a factor 4. Current and hence power to each motor will be somewhat less because of internal resistance of the battery but depending on your motors resistance it could be hardly noticeable... Only thing you can say with certainty is that your battery will drain 4 times faster.  
  > **username_0**: Anyways, can I link up 3 9V batteries in series and connect them to the hub without it burned up?  
  > **username_1**: No, in series that would mean 27 V, I read in some article that the motor controller IC can only handle 10.5 V. So that's the best you can do, i.e. add another 1.5 V battery to your original 6 in series, which buys you about 17% more power, I don't think it's worth the risk.  
  
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  ## 0 answers
  
  