How to Choose a Suitable Brushed DC Motor

Brushed DC motors are one of the most common motor types, widely used in automotive, power Tools,Pumps,garden tools ,particularly in low-power, high-starting-torque applications. Selecting the right motor has a significant impact on the performance and cost of your equipment. Considering factors such as speed,torque,Size,duty,cycle,load,compatibility,Voice,temperature,and maintenance requirements can help you make an informed choice.With so many options available, here’s what to look at before making your decision.

Determine voltage, speed, and torque requirements

Start by confirming your voltage requirements — DC motors typically operate between 2V and 36V depending on the power needed. For speed, the rated (loaded) speed matters more than the no-load speed, as it reflects real-world performance under load. Torque — the amount of resistance the output shaft can overcome — is directly tied to speed. Knowing both the rated torque and stall torque (peak torque) will help you select the right standard motor or gear motor for efficient operation.

Size and performance considerations

Once you have determined the required voltage, speed, and torque parameters, the next step is to consider the physical size of the motor as it will be installed in your product. Generally, larger motors deliver more power and torque — typical miniature brushed DC motors range from 28–52 mm in diameter and 38–85 mm in length. If space is limited, you may need to trade off between size, power, and torque, and adjust your requirements or budget accordingly.

Define your duty cycle

The duty cycle — including running time, downtime, and direction of rotation — determines which motor type best suits your application. For most industrial uses, an intermittent duty cycle is recommended to extend motor and gear reducer life. Continuous operation is also possible, you need to ensure that the motor is always running at peak efficiency.

Accessories considerations

Finally, you need to determine the built-in accessories for your motor, which are typically selected based on your product's characteristics, application, and requirements.

For example, if your product is a power drill, electric screwdriver, or any other application with high torque demands, you should pay close attention to heat management — a built-in cooling fan is usually recommended to improve heat dissipation. If your product is a fan, water pump, or adult products where low noise and long service life are priorities, we recommend using ball bearings instead of standard sleeve bearings. If your product is intended for export, it will need to pass EMC testing, which requires adding components such as capacitors, inductors, and varistors inside the motor to suppress electromagnetic interference.

Motor performance considerations

To get the most out of a brushed DC motor, keep these four areas in mind:

1. Motor efficiency— choose high-efficiency motors to reduce energy loss and improve overall performance.
2. Load matching— ensure the motor’s torque and speed match your actual load requirements for optimal efficiency.
3. Voltage compatibility— operating within the specified voltage range prevents overheating and extends service life.
4. Control system integration— pair the motor with a compatible control system so you can fine-tune performance parameters as needed.

Conclusion

Choosing the right motor has a significant impact on the performance and cost of your equipment. Before purchasing, be sure to fully consider voltage, speed, torque, size, duty cycle,accessories,etc . Hongyang Motor offer customers a wide range of brushed DC motors and other motor types, providing reliable, efficient, and high-performance motor solutions for a variety of applications.Feel free to contact us for professional motor selection support.