The project presented here is a three-phase BLDC motor pre-driver. The project consists of 3x half-bridge IR2101 driver IC and 6 channel high current N-MOSFETS. The project can be configured as 3 independent half-bridges H-bridge for a brushed DC motor, or a single high current brushless motor driver. The rotor position can be detected using 3 hall sensors assembled in the motor. Hall-effect shaft position sensors are used to control the switching sequence of the three 1/2 bridge outputs. The bridge voltage can vary between 15V and 60V and the maximum summed bridge current is 10A with a large size heat-sink and sufficient airflow using a fan. This motor driver can be used for multiple applications including e-bikes, battery-powered tools, electric power steering, wheelchairs, or any other application, where a BLDC motor is utilized. Motor start/stop, forward/reverse rotation, braking with closed-loop speed control. The project also includes 3 phase current sense circuit which can be used to detect 3 independent phase currents. An LM317 regulator provides 5V DC to op-amp circuitry. All inputs and feedback outputs provided for an easy micro-controller or DSP interface.
Current Sense Circuit: Current sense circuit measures the current across all 3 half-bridges and provides 3 independent current feedback outputs, this can be used for overcurrent sense or senseless FOC configuration, the default output at 0A is 1.45V, and provides approx. 100mV/Amp. User may change the Gain of an op-amp, current shunt resistors as per requirement, LM317 power 5V to op-amp circuit.
User need to generate 6 PWM pulse sequence to control the motor, the board accepts TTL input, more information about brushless motor driver available here:
- https://www.digikey.com/en/articles/why-and-how-to-sinusoidally-control-three-phase-brushless-dc-motors
- https://www.microchip.com/wwwappnotes/appnotes.aspx?appnote=en1001927
FEATURES
- Operating Supply-Motor 15V to 60V
- Load 5 Amps (10Amps Maximum)
- Gate Driver Supply 12-15V DC
- 3 Independ Half-Bridge
- H-Bridge (DC Brushed Motor Driver)
- 3 Phase Brushed DC Motor Driver
- DC Bus Voltage FeedBack (Load Supply)
- LED for Gate driver supply
- 3 Phase Current sense output 100mV/Amp
- PWM Frequency up to 20Khz.
- Required 6 PWM Signals
- PCB Dimensions 143.69 x 52.40 mm
Read more: 15V TO 60V – THREE-PHASE BRUSHLESS DC MOTOR PRE-DRIVER
