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How to determine the lowest speed that can be controlled by PWM control of a DC brushed motor (with deceleration head)?

Hardware design
enero 15, 2021 by Talon 1328

Using PWM to control a DC motor (brushed) wants to control the motor down to 1r/min. I wonder if it is feasible? (When the motor is directly energized, 100r/min 24V 25W).

The current experimental result is 12R/min at 20KHZ 68%.

First time production, I would like to ask:

1. Can ordinary DC motors achieve 1r/min?

2. How to calculate the minimum speed of the motor? (Formula or data).

3. Under PWM control speed, how much torque drops at low speed?

Please help to answer. Thank you! ! ! !

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Felipe Publicado en January 15, 2021

1. At such a low speed, the coil is easy to burn, I know that the ultrasonic motor can be very low speed.

2. The speed is measured by a motor such as a rotary encoder or a code disc.

3. There is a torque calculation formula, but you can't remember it. Check the information.

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Clark Publicado en January 15, 2021

Low speed, high power consumption, large current

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Clare Publicado en January 15, 2021

Make a speed test, the lowest speed is up to you

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