This drive is suitable for small DC motors 6V, 12V, 24V etc. The potentiometer adjusts the speed of rotation from 0% to almost 100%. There will still be approximately 1.5V of loss in the Darlington transistor. This is not a problem with 12V or 24V motors. For the lowest voltages, it will be necessary to adapt to it: the variator will allow to go for example from 0% to 80% of the speed of rotation.
Variable speed drive operation
The principle of this variator is based on a ballast transistor. The potentiometer creates the voltage from 0% to 100% of the input voltage and the transistor amplifies the current coming from the potentiometer (= current which enters the base of T1). You have to use a Darlington. T1 dissipates the difference in input and output voltages multiplied by the current flowing through it. If the DC motor makes a few watts or more, a heat sink for the inverter transistor is absolutely necessary.
Electric motor speed controller. In this video we learn how to design a simple PWM speed controller for a DC motor learning how current flows in the circuit and what each component does. You can even build the circuit yourself!
This drive is suitable for small DC motors 6V, 12V, 24V etc. The potentiometer adjusts the speed of rotation from 0% to almost 100%. There will still be approximately 1.5V of loss in the Darlington transistor. This is not a problem with 12V or 24V motors. For the lowest voltages, it will be necessary to adapt to it: the variator will allow to go for example from 0% to 80% of the speed of rotation.
Variable speed drive operation
The principle of this variator is based on a ballast transistor. The potentiometer creates the voltage from 0% to 100% of the input voltage and the transistor amplifies the current coming from the potentiometer (= current which enters the base of T1). You have to use a Darlington. T1 dissipates the difference in input and output voltages multiplied by the current flowing through it. If the DC motor makes a few watts or more, a heat sink for the inverter transistor is absolutely necessary.
Electric motor speed controller. In this video we learn how to design a simple PWM speed controller for a DC motor learning how current flows in the circuit and what each component does. You can even build the circuit yourself!
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