PSB8060

Sensorless BLDC control eliminates the need for Hall effect sensors by detecting rotor position through back-EMF sensing. The PSB8060 measures the voltage induced in the unenergized motor phase to determine rotor position. This information is used to commutate the motor at the optimal time for maximum efficiency. Sensorless control reduces system cost, eliminates sensor wiring, and improves reliability. The technique works well at medium to high speeds; at very low speeds, the back-EMF is too small for reliable detection, requiring special startup algorithms.

Sensorless control is ideal for cost-sensitive and high-reliability applications. For very low-speed operation, consider sensored control or special startup algorithms.

Field-oriented control (FOC) is an advanced motor control technique that transforms three-phase currents into a rotating reference frame match the rotor flux. This allows independent control of torque and flux, similar to DC motor control. Benefits include: 1) Maximum torque per ampere for highest efficiency; 2) Smooth operation across entire speed range; 3) Fast dynamic response to load changes; 4) Precise speed and position control; 5) Lower torque ripple and noise. The PSB8060 implements FOC internally, simplifying system design.

Use FOC for high-performance applications requiring efficiency and smooth operation. Contact our FAE team for FOC parameter tuning guidance.

External MOSFET selection depends on voltage, current, and switching requirements. Key parameters: 1) VDS rating should be at least 1.5x the maximum supply voltage; 2) RDS(on) should be low enough to handle current without excessive heating; 3) Gate charge affects switching speed and driver power dissipation; 4) Body diode characteristics affect commutation losses. For a 24V system with 5A current, select MOSFETs with VDS >= 60V and RDS(on) < 20mΩ. The PSB8060's 1A gate drive capability supports fast switching of large MOSFETs.

Select MOSFETs with adequate voltage margin and low RDS(on). Our FAE team can recommend specific parts for your voltage and current requirements.

The PSB8060 supports multiple control interfaces: SPI for full parameter access and diagnostics including speed, torque, and current limits; PWM for simple speed control with duty cycle determining speed; Analog voltage input for speed control using a potentiometer or DAC; and Digital inputs for direction and enable control. The SPI interface provides the most flexibility, allowing real-time adjustment of control parameters and access to diagnostic information including motor current, speed, and fault status.

Use SPI for advanced applications requiring parameter adjustment. Use PWM for simple speed control applications. Contact our FAE team for interface selection guidance.

FOC tuning involves setting current loop PI gains and speed loop PI gains. Start with current loop tuning: 1) Set proportional gain (Kp) to achieve fast response without oscillation; 2) Set integral gain (Ki) to eliminate steady-state error. Then tune speed loop with lower gains than current loop. The PSB8060 includes auto-tuning features to simplify this process. Provide motor parameters (resistance, inductance, back-EMF constant) and the algorithm calculates initial gains. Fine-tune based on actual performance.

Use auto-tuning first, then fine-tune for optimal performance. Our FAE team can provide detailed tuning procedures and motor parameter measurement guidance.