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DRV5011 Datenblatt(PDF) 11 Page - Texas Instruments

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Teilenummer DRV5011
Bauteilbeschribung  Low-Voltage, Digital-Latch Hall Effect Sensor
Download  27 Pages
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

DRV5011 Datenblatt(HTML) 11 Page - Texas Instruments

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Hall 1
Hall 2
Hall 3
U
V
W
Phase
Voltages
DRV5011
Outputs
Electrical Angle
Mechanical Angle
120°
360°
240°
30°
60°
.
11
DRV5011
www.ti.com
SLVSCY6 – DECEMBER 2017
Product Folder Links: DRV5011
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Copyright © 2017, Texas Instruments Incorporated
8.2.1.2 Detailed Design Procedure
Three-phase brushless DC motors often use three Hall effect latch devices to measure the electrical angle of the
rotor and tell the controller how to drive the three wires. These wires connect to electromagnet windings, which
generate magnetic fields that apply forces to the permanent magnets on the rotor.
Space the three Hall sensors across the printed-circuit board (PCB) so that they are 120 electrical degrees apart.
This configuration creates six 3-bit states with equal time duration for each electrical cycle, which consists of one
north and one south magnetic pole. From the center of the motor axis, the number of degrees to space each
sensor equals 2 / [number of poles] × 120°. In this design example, the first sensor is placed at 0°, the second
sensor is placed 20° rotated, and the third sensor is placed 40° rotated. Alternatively, a 3× degree offset can be
added
or
subtracted
to
any
sensor,
meaning
the
third
sensor
could
alternatively
be
placed
at
40° – (3 × 20°) = –20°.
8.2.1.3 Application Curve
Figure 13. Phase Voltages and Hall Signals for 3-Phase BLDC Motor


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