NEMA23, NEMA24 BLDC Motor Driver
The BLD-300B BLDC motor drive is a high performance, cost-effective 3 phase BLDC motor drive, which can provide power output Max 300VA.
The design is based on advanced DSP technology and features high torque, low noise, low vibration, PID speed loop, PID current loop, over current protection, overload protection, and combined use of manual speed adjustment and automatic speed adjustment.
Operating voltage: 18-50VDC
Maximum drive force: 300W
Output current: 15-25A
Hall signal power: 4.5-5.5V (rated 5V)
Hall current: 20mA
External potentiometer: 10K Ohms
Power input 24-48V DC
U V W: Motor phase wire (heavy line)
HU HV HW: Hall signal wire (fine line)
REF+: Hall power+
REF-: Hall power-
VCC: External Potentiometer Power Supply ( Internal Power
Supply Only)
SV: Wiring terminal of the external potentiometer. Vacant when using a built-in potentiometer
COM: Common terminal (low level)
F/R: Direction (forward at a high level or vacant/ revers at a low level)
BRK: Brake
EN: Enable
SPEED: Speed output
ALARM: Alarm output
Suitable motor speed: 20000RPM
BLD-300B Wiring Diagram Typical
The main differences between the BLD-300B and BLD-300C:
Specifications and Speed Control: The BLD-300B features a peak current of 20A with a working voltage of DC 12V–56V and explicitly lists pulse speed control in its configuration, whereas the BLD-300C operates at a slightly higher peak current of 20.6A across a wider voltage range of DC 15V–62V.
Performance and Linear Accuracy: While both drivers deliver nearly identical speed outputs under PWM and analog control , the BLD-300C achieves a perfect 1:1 linear correlation during closed-loop pulse frequency testing (e.g., 1000 Hz exactly matches 1000 RPM), offering a more precise and controlled response than the BLD-300B's open-loop pulse performance.
