Permanent Magnet Pump Speed Control

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Discussion Overview

The discussion centers around controlling the speed of a submerged magnetic water pump, specifically focusing on reducing the frequency of the AC supply to lower the propeller's RPM. Participants explore potential circuit designs and components that could achieve this goal.

Discussion Character

  • Technical explanation
  • Exploratory
  • Homework-related

Main Points Raised

  • One participant inquires about building a circuit to reduce the frequency of the AC supply for a magnetic water pump.
  • Another participant requests more details about the pump's operation to assist in finding a solution.
  • A participant describes the pump's mechanism, noting that the magnetic rotor is connected to a propeller and expresses a desire for a variable speed control solution similar to a rheostat.
  • One participant asks for the motor's current rating to provide more tailored advice.
  • A participant shares a schematic for a control circuit that may be applicable, while also noting the importance of voltage specifications.
  • Another participant clarifies the pump's specifications, stating it is rated at 17 watts, 230V, and 50Hz, and emphasizes the need for a solution compatible with these ratings.
  • There is a discussion about the current draw of the motor and the suitability of the suggested control circuit for the pump's power requirements.
  • A suggestion is made to search online for additional AC motor speed control circuit designs.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on a specific solution, as various circuit designs and approaches are suggested without agreement on a single method.

Contextual Notes

Participants have not fully explored the implications of the proposed circuit designs, and there may be limitations related to the specific requirements of the pump and the compatibility of suggested components.

Who May Find This Useful

Individuals interested in electrical engineering, motor control, or DIY electronics projects may find this discussion relevant.

Cudaxtreme
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Hi,

I have a submerged magnetic water pump that is pushing too much water at 8500L/hr. I know that the propeller rpm depends on the frequency of the AC supply but how can I build a simple circuit to reduce the frequency?

Thanks :smile:
 
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Could you brief me about ur device so that I can try to figure out some way of reducing the frequency.? How does your pump work?


Sridhar
 
Its has a magnetic rotor that will spin when switched on, this rotor is connected to a propeller that pushes the water. I need something that can reduce the frequency of the AC supply so that the propeller will spin at a lower rpm. The best solution would be something like a rheostat where I can adjust the speed with a turn of a knob.
 
Do you know the current rating of the motor?

I found this schematic that you might be able to use.

http://www.electronics.50g.com/cacspeed.htm
 
Last edited by a moderator:
Its a small pump, rated at 17watts/230V/50Hz.

I would need something for 230V

Thanks!
 
Sorry, I shouldn't assume 110/120 V.

Not much current draw at all. That control circuit is rated at 10 A at 120V. The maximum power it can handle is 1200W. Since your motor is rated at 17 watts, it would have no problem handling the power requirements of your pump at 230V.

A google search for "AC motor speed control" will yield lots of hits if you want to look for other circuit designs.
 

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