How to avoid a clash of magnetic charge and electric charge

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Discussion Overview

The discussion revolves around the challenges of supplying high voltage to a DC motor in a project involving a rotating platform disc. Participants explore the implications of applying high voltage at different points on the motor and the potential effects on the motor's control electronics.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Exploratory

Main Points Raised

  • One participant describes a problem where supplying positive high voltage at the motor shaft causes the motor to stop working, while supplying from the top allows it to function properly.
  • Another participant asserts that there is no such thing as magnetic charge and questions the voltage level and type of DC motor being used.
  • A participant suggests that electric charge may be upsetting the control electronics of the motor, noting the presence of a component board.
  • Concerns are raised about the potential for high voltage to cause issues with the motor driver and microcontroller due to signal interference and leakage.
  • One participant expresses a preference for supplying high voltage from below for design simplicity, while another questions the safety of doing so given the participant's level of knowledge.
  • There is a discussion about the risks associated with using high voltage, with some participants advising against it based on the participant's experience.
  • A later reply emphasizes the importance of consulting a supervisor or professor rather than seeking advice from online sources, highlighting the limitations of remote guidance.

Areas of Agreement / Disagreement

Participants express differing views on the safety and feasibility of using high voltage in the project. While some caution against it due to the participant's inexperience, others acknowledge the necessity of high voltage for the project, leading to an unresolved debate on the matter.

Contextual Notes

Participants note the complexity of the setup and the potential for misunderstanding due to lack of detailed information about the project. There are also concerns regarding the participant's qualifications to handle high voltage safely.

nashikin58
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Hi, now I'm working on a project which involves a dc motor and high voltage. I'm developing a machine consists of a motor to rotate a platform disc and high voltage will be applied during the rotation. The problem is when I supply a positive high voltage at motor shaft during rotation, the motor stop working. While, if i supply from the top, the motor working well. Do you guys have any idea, how I can supply the high voltage properly? Thank you
 

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There is no such thing as magnetic charge.

Are you working in a laboratory under supervision?

How high is the voltage.

There are many types of DC motors. What type is yours?

nashikin58 said:
The problem is when I supply a positive high voltage at motor shaft during rotation, the motor stop working. While, if i supply from the top,
I don't know what that means. Can you post a sketch of the schematic? Use the UPLOAD button to post pictures.
 
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nashikin58 said:
Hi, now I'm working on a project which involves a dc motor and high voltage. I'm developing a machine consists of a motor to rotate a platform disc and high voltage will be applied during the rotation. The problem is when I supply a positive high voltage at motor shaft during rotation, the motor stop working. While, if i supply from the top, the motor working well. Do you guys have any idea, how I can supply the high voltage properly? Thank you
I suspect the electric charge is upsetting the control electronics of the motor. I can see a component board on the motor.
 
nashikin58 said:
While, if i supply from the top, the motor working well. Do you guys have any idea, how I can supply the high voltage properly?

Why can’t you supply it from the top, then?
 
anorlunda said:
There is no such thing as magnetic charge.

Are you working in a laboratory under supervision?

How high is the voltage.

There are many types of DC motors. What type is yours?I don't know what that means. Can you post a sketch of the schematic? Use the UPLOAD button to post pictures.[/QUOTEHi,
anorlunda said:
There is no such thing as magnetic charge.

Are you working in a laboratory under supervision?

How high is the voltage.

There are many types of DC motors. What type is yours?I don't know what that means. Can you post a sketch of the schematic? Use the UPLOAD button to post pictures.

hi, I am using a brushless dc motor. for now, I am using 3kV.
 
tech99 said:
I suspect the electric charge is upsetting the control electronics of the motor. I can see a component board on the motor.

oh, i see. I am used a motor driver and a microcontroller to rotate the motor. do you have any idea why its upsetting the control electronics?
 
Guineafowl said:
Why can’t you supply it from the top, then?

hi, I am prefer to supply from below that form the top. its easy to design other components.
 
nashikin58 said:
oh, i see. I am used a motor driver and a microcontroller to rotate the motor. do you have any idea why its upsetting the control electronics?
The electronics will use signals of just a few volts, and the CMOS semiconductors have very high input resistance. So the slightest leakage of the 3kV supply will upset them. If the 3kV supply is noisy or pulsing that will make it worse.
 
tech99 said:
The electronics will use signals of just a few volts, and the CMOS semiconductors have very high input resistance. So the slightest leakage of the 3kV supply will upset them. If the 3kV supply is noisy or pulsing that will make it worse.
okay, I understand it. It seems like the motor driver will have a short circuit or burn. A 3kvV is the lowest high voltage I will use. In this project, I will use up to 15kV. Do you think, supply the high voltage is a good idea? sorry, and thank you for the reply. I'm quite new in motor theory and still learning.
 
  • #10
I don't think you should use any HV on your own with your current level of knowledge, and certainly not based on what some strangers suggested via the internet.
 
  • #11
mfb said:
I don't think you should use any HV on your own with your current level of knowledge, and certainly not based on what some strangers suggested via the internet.

for my project, I need to use a HV. My project is to develop a machine called centrifugal electrospinning.
 
  • #12
@mfb is right. It does not sound like you have the qualifications to work safely with these voltages on your own. Your questions should be asked to your professor, or the laboratory supervisor; not to strangers on the Internet.

It is impossible for us to know the totality of what you are trying to do, and the details of your setup. Therefore we might give wrong answers. Please ask someone in the laboratory with you.

Thread closed.
'
 
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