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CSD88599Q5DC Fiches technique(PDF) 10 Page - Texas Instruments |
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CSD88599Q5DC Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 23 page Copyright © 2017, Texas Instruments Incorporated GH1 GH2 GL1 SH1 GL2 SH2 SH3 GH3 Gate Driver Three Phase GL3 VCS 0 Rcs1 SPA 0 Rcs3 SPC SPA SPC SPB Q1 0 Q4 Vin GH1 GL1 SH1 PGND Vin Vsw1 0 Q2 Q5 SH2 GH2 Vin GL2 Vsw2 PGND Q3 Q6 GH3 GL3 SH3 Vsw3 PGND Vin PB3 PB2 PB1 DRV8323RX Rcs2 N SPEED SET TORQUE SET SPB PWM1 Sensors Hall U PWM2 V PWM4 PWM3 W S PWM6 PWM5 B A C C B A Inputs Hall 10 CSD88599Q5DC SLPS597 – APRIL 2017 www.ti.com Product Folder Links: CSD88599Q5DC Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 6.2 Brushless DC Motor With Trapezoidal Control The trapezoidal commutation control is simple and has fewer switching losses compared to sinusoidal control. Figure 17. Functional Block Diagram The block diagram shown in Figure 17 offers a simple instruction of what is required to drive a BLDC motor: one microcontroller, one three-phase driver IC, 3 power blocks (historically 6 power MOSFETs) and 3 Hall effect sensors. The microcontroller responsible for block commutation must always know the rotor orientation or its position relative to the stator coils. This is easy achieved with a brushed DC motor due to the fixed geometry and position of the rotor windings, shaft and commutator. A three-phase BLDC motor requires three Hall effect sensors or a rotary encoder to detect the rotor position in relation to stator armature windings. With input from these three Hall effect sensors output signals, the microcontroller can determine the proper commutation sequence. The three Hall sensors named A, B, and C are mounted on the stator core at 120° intervals and the stator phase windings are implemented in a star configuration. For every 60° of motor rotation, one Hall sensor changes its state. Based on the Hall sensors' output code, at the end of each block commutation interval the ampere conductors are commutated to the next position. There are 6 steps required to complete a full electrical cycle. The number of block commutation cycles to complete a full mechanical rotation is determined by the number of rotor pole pairs. |
Numéro de pièce similaire - CSD88599Q5DC |
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Description similaire - CSD88599Q5DC |
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