How to Select a Compatible Brushless Driver for a Coreless Motor?

To assist customers in selecting the appropriate products, this article outlines the key parameters to consider when pairing a coreless motor with a brushless driver.

1. Confirm the Rated Speed of the Coreless Motor

Speed compatibility is critical when matching a coreless motor with a brushless driver. Currently, our available brushless drivers support a maximum speed of only 20,000 RPM, even after removing the jumper cap to lift the speed limit. Therefore, coreless motors with a rated speed exceeding 20,000 RPM cannot be supported by our drivers.

For instructions on how to remove the speed limit using the jumper cap, please refer to the following article:

How to Use a Jumper Cap to Adjust the Upper Speed Limit of a Brushless Drive?

2. Determine Whether the Coreless Motor is Sensored or Sensorless

Visit the product detail page of the coreless motor and check the wiring diagram at the bottom of the page. If the diagram includes Hall sensor wires, as shown in the example, the motor is a sensored brushless motor. If not, it is a sensorless brushless motor.

This distinction is crucial, as some of our brushless drivers only support sensored motors. Pairing them with a sensorless motor will result in operational failure. For details on which drivers are compatible with sensorless brushless motors, please see the following article:

How to Switch Between Sensored and Sensorless Modes in Brushless Drives?

3. Identify the Key Parameters of the Coreless Motor

To select a compatible brushless driver, first confirm the following three key parameters of the coreless motor: rated voltage, rated current, and rated power.

For example, motor model 30CL56-24-P2-4820 has a rated voltage of 24V, a rated current of 1.61A, and a rated power of 22.71W. When selecting a driver, use these values to filter and identify drivers that can support the motor's normal operation.

4. Verify the Output Current of the Brushless Driver at Various Voltages

The output current of the BLD-405S brushless driver varies with the output voltage. Therefore, the core principle for matching is: at the motor's rated voltage, the current output by the driver must be greater than or equal to the motor's rated current.

Taking the 30CL56-24-P2-4820 coreless motor (rated voltage 24V, rated current 1.61A) as an example, both the BLD-305S and BLD-405S drivers meet this requirement and are considered compatible models. (This driver selection method also applies to our standard brushless motor series.)

Additional Note: PWM Signal Voltage Requirements

For optimal performance, our brushless drivers recommend using a 5V PWM control signal.

If a 3.3V signal is used, the driver can still recognize and operate, but since the signal voltage is only about two-thirds of the recommended value, the motor's maximum speed will be limited to approximately two-thirds of its rated value, resulting in significant performance degradation.

Therefore, to ensure the motor delivers 100% of its rated performance, we do not recommend using a 3.3V PWM signal.

Updated on: 28/11/2025