A sensorless 3-phase brushless motor drive scheme based on Toshiba TB67B001FTG

A sensorless 3-phase brushless motor drive scheme based on Toshiba TB67B001FTG, which controls the speed of the brushless motor by changing the PWM duty cycle.

Application areas: Sweeping robots (edge and middle sweeps), small cooling fans for PC servers, and household appliances such as refrigerators.

Block diagram:

Physical

Project features:
1. Noisy operation: Reduce vibration and motor noise by using 150 ° wide angle rectification drive;
2. Sensorless drive: capable of controlling the rotation of three-phase brushless motors without the need for any Hall sensors;
3. High speed rotation: The maximum speed can reach 18000rpm (when using an 8-pole motor);
4. Working voltage: 5-12V, maximum working current: 2.5A;
5. Smaller PCB dimensions (26mm x 21mm);
6. Motor control: Control the motor speed, start and stop through the duty cycle PWM signal (TSP pin);
7. It has a speed feedback output signal FG.

TB67B001FTG Features:
1. Output current: Absolute maximum rated value: 3A;
2. Power supply: Absolute maximum rated value: 25V;
3. Adjustable output PMW duty cycle;
4. Optional control based on pulse duty cycle input or analog voltage input;
5. Leading angle control;
6. Overlapping commutation (120 °, 135 °, and 150 °);
7. Speed detection signal (FG-OUT);
8. Lock detection signal (LD-OUT);
9. Adjustable startup settings;
10. Forced commutation frequency control;
11. Over current protection (ISD), thermal shutdown (TSD), undervoltage lockout (UVLO);
Pin diagram:

Connection instruction: