How to control the speed of 1.5 Volt motor?

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Discussion Overview

The discussion focuses on methods to control the speed of a 1.5 Volt motor, specifically exploring techniques suitable for DC brushed permanent magnet motors. Participants consider various approaches including voltage reduction and Pulse Width Modulation (PWM).

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • Some participants suggest reducing the voltage to control motor speed, proposing a lower voltage like 1V.
  • Others advocate for using Pulse Width Modulation (PWM) as a method to control speed by rapidly switching the 1.5V on and off to achieve a lower average voltage.
  • One participant raises the idea of using a rheostat (potentiometer) for speed control but notes that it may not work effectively due to limitations on current and torque.
  • Another participant reinforces the preference for PWM over rheostats, citing issues with torque loss when using resistive methods.

Areas of Agreement / Disagreement

Participants express differing opinions on the effectiveness of rheostats compared to PWM, indicating a lack of consensus on the best method for speed control.

Contextual Notes

There are unresolved considerations regarding the specific characteristics of the motor and the implications of each method on performance, such as torque and current limitations.

prasahant
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How to control the speed of 1.5 Volt motor?
 
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Most 1.5V motors are probably DC brushed permanent magnet motors. To control the speed you can either reduce the voltage (eg to 1V) or use Pulse Width Modulation (switch the 1.5V on and off rapidly so that the average voltage is less).
 
Rheostat (potentiometer)?
 
brainpushups said:
Rheostat (potentiometer)?

doesn't really work too well as it severely limits the current to the motor as well and it looses its torque power

That's why PWM is the best way to control the speed
 

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