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DRV5011 Arkusz danych(PDF) 12 Page - Texas Instruments |
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DRV5011 Arkusz danych(HTML) 12 Page - Texas Instruments |
12 / 27 page VCC Controller DRV5011 VCC GND OUT DRV5011 VCC GND OUT N S N S VCC VCC GPIO GPIO Copyright © 201 7, Texas Instrumen ts Incorpor ate d 12 DRV5011 SLVSCY6 – DECEMBER 2017 www.ti.com Product Folder Links: DRV5011 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 8.2.2 Incremental Rotary Encoding Application Figure 14. Incremental Rotary Encoding System 8.2.2.1 Design Requirements For this design example, use the parameters listed in Table 2. Table 2. Design Parameters DESIGN PARAMETER EXAMPLE VALUE RPM range 0 to 45 k Number of magnet poles 8 Magnetic material Ferrite Air gap above the Hall sensors 2.5 mm Magnetic flux density peaks at the Hall sensors at maximum temperature ±7 mT 8.2.2.2 Detailed Design Procedure Incremental encoders are used on knobs, wheels, motors, and flow meters to measure relative rotary movement. By attaching a ring magnet to the rotating component and placing a DRV5011 nearby, the sensor generates voltage pulses as the magnet turns. If directional information is also needed (clockwise versus counterclockwise), a second DRV5011 can be added with a phase offset, and then the order of transitions between the two signals describes the direction. Creating this phase offset requires spacing the two sensors apart on the PCB, and an ideal 90° quadrature offset is attained when the sensors are separated by half the length of each magnet pole, plus any integer number of pole lengths. Figure 14 shows this configuration, as the sensors are 1.5 pole lengths apart. One of the sensors changes its output every 360° / 8 poles / 2 sensors = 22.5° of rotation. For reference, TI Design TIDA-00480, Automotive Hall Sensor Rotary Encoder, uses a 66-pole magnet with changes every 2.7°. The maximum rotational speed that can be measured is limited by the sensor bandwidth. Generally, the bandwidth must be faster than two times the number of poles per second. In this design example, the maximum speed is 45000 RPM, which involves 6000 poles per second. The DRV5011 sensing bandwidth is 30 kHz, which is five times the pole frequency. In systems where the sensor sampling rate is close to two times the number of poles per second, most of the samples measure a magnetic field that is significantly lower than the peak value, because the peaks only occur when the sensor and pole are perfectly aligned. In this case, add margin by applying a stronger magnetic field that has peaks significantly higher than the maximum BOP. |
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