DC brushed motor drive

Motors are difficult to buy. Be careful when re-engraving.

Hardware principle:

CH224K tricks the charger into outputting more power to meet motor consumption

NE555 uses a potentiometer to adjust the duty cycle to control MOS conduction to control the motor speed.

Default operating voltage range: 9V~20V

Motor no-load parameters: 20V 0.2A  

Frequency: around 800Hz Duty cycle: around 10%~90%

The small hand drill is composed of: PCBA + shell + motor + drill clamp

The shell is designed with Solidworks 2021. Export the STL file to Lichuang 3D printing. The relevant information is in the attachment.

The motor is a side-door motor (12-24V high torque motor) that I bought a long time ago. It has been used for several years. I recently dug it out and thought about recycling it, so I made a small hand drill.

The specific model of the motor is unknown, only the dimensions: length 33mm, diameter 20mm, thickness 17mm, shaft length 5mm, shaft diameter 2mm

I only found two similar double-headed ones (I used a single-headed one) on a certain website. You can refer to the link here:

  https://m.tb.cn/h.UaLxAkq?tk=ygBs2uWJEF3

  https://m.tb.cn/h.UaLykJ7?tk=qQ882uWr8Bs

The drill clamp is selected according to the diameter of the motor shaft.