Dc motor speed controller

ajkumar-1907·power-converter-lib·dc-motor-speed-controller/dc-motor-speed-controller.kicad_pcb

Dc motor speed controller PCB layout, top view — open source board by ajkumar-1907

About the Dc motor speed controller PCB

Dc motor speed controller is an open source PCB design by ajkumar-1907, published on GitHub under the MIT license. It is a 2-layer board measuring 56.5 × 29 mm, with 15 components from 10 distinct parts.

Other key parts include the NE555P. By type, the board carries 4 diodes, 3 capacitors, 3 resistors, 2 connectors, 1 IC and 1 transistor.

From the project

Open-source library of power electronics converter topologies — KiCad schematics, working principles, use cases, and design notes for DC-DC, AC-DC, DC-AC, and AC-AC converters. Free to use, modify, and build on.

A PWM speed controller for brushed DC motors. An NE555 timer generates a fixed-frequency PWM signal whose duty cycle is set by a potentiometer, and a TIP122 Darlington transistor switches the motor current.

Reducing a DC motor's supply with a series resistor wastes power as heat and kills low-speed torque. Pulse-width modulation (PWM) instead switches the motor fully on and fully off many times a second. The motor's inductance and mechanical inertia average the pulses, so the effective voltage is set by the duty cycle:

Dc motor speed controller, from the project README — From the project README

Main components on the Dc motor speed controller

Dc motor speed controller bill of materials (BOM)

15 components, 10 distinct parts.

Qty	Part	Footprint	Refs
1	NE555P	DIP-8_W7.62mm	U1
1	TIP122	TO-220-3_Vertical	Q1
2	Screw_Terminal_01x02	TerminalBlock_bornier-2_P5.08mm	J1, J2
1	100K	Potentiometer_Alps_RK163_Single_Horizontal	RV1
3	1N4007	D_DO-41_SOD81_P10.16mm_Horizontal	D1, D2, D3
1	LED	LED_D5.0mm	D4
2	100nF	C_Disc_D4.7mm_W2.5mm_P5.00mm	C1, C2
1	1000uF	CP_Radial_D10.0mm_P5.00mm	C3
2	1K	R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	R1, R2
1	2.2K	R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal	R3

Dc motor speed controller design files

The KiCad project lives in the ajkumar-1907/power-converter-lib repository on GitHub; these links point at the commit this page was built from.

Dc motor speed controller: common questions

How big is the Dc motor speed controller PCB?

The Dc motor speed controller measures 56.5 × 29 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Dc motor speed controller?

15 components, from 10 distinct parts. The full bill of materials is listed on this page.

Where can I download the Dc motor speed controller design files?

From the ajkumar-1907/power-converter-lib repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Dc motor speed controller design in my own project?

Yes, under the terms of its MIT license, which ajkumar-1907 chose for the repository.

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