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AVR194
The coils are stationary while the magnet is rotating. The rotor of the BLDC motor is lighter than
the rotor of a conventional universal DC motor where the coils are placed on the rotor.
2.3
Hall Sensor
For the estimation of the rotor position, the motor is equipped with three hall sensors. These hall
sensors are placed every 120°. With these sensors, 6 different commutations are possible.
Phase commutation depends on hall sensor values.
Power supply to the coils changes when hall sensor values change. With right synchronized
commutations, the torque remains nearly constant and high.
Figure 3. Hall Sensors signals for CW rotation
Hall_1
Hall_2
Hall_3
Coil_U
Coil_V
Coil_W
t
t
t
t
t
t
2.4
Phase Commutations
To simplify the explanation of how to operate a three phase BLDC motor, a typical BLDC motor
with only three coils is considered. As previously shown, phases commutation depends on the
hall sensor values. When motor coils are correctly supplied, a magnetic field is created and the
rotor moves. The most elementary commutation driving method used for BLDC motors is an on-
off scheme: a coil is either conducting or not conducting. Only two windings are supplied at the
same time and the third winding is floating. Connecting the coils to the power and neutral bus
induces the current flow. This is referred to as trapezoidal commutation or block commutation.
below shows a 3 half bridge schematic.
3
8138A–AVR–04/08
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相关代理商/技术参数
ATAVRMC301
功能描述:开发板和工具包 - AVR Processor Brd w/ TINYx61 RoHS:否 制造商:Arduino 产品:Evaluation Boards 工具用于评估:ATMega32U4 核心:AVR 接口类型:I2C, UART, USB 工作电源电压:6 V to 20 V
ATAVRMC303
功能描述:BOARD EVAL MOTOR CTRL W/XMEGA RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:AVR® 标准包装:1 系列:- 主要目的:数字电位器 嵌入式:- 已用 IC / 零件:AD5258 主要属性:- 次要属性:- 已供物品:板 相关产品:AD5258BRMZ1-ND - IC POT DGTL I2C1K 64P 10MSOPAD5258BRMZ10-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ100-ND - IC POT DGTL I2C 100K 64P 10MSOPAD5258BRMZ50-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ1-R7-ND - IC POT DGTL I2C 1K 64P 10MSOPAD5258BRMZ10-R7-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ50-R7-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ100-R7-ND - IC POT DGTL I2C 100K 64P 10MSOP
ATAVRMC310
功能描述:开发板和工具包 - AVR Processor Brd w/ MEGA32M1 RoHS:否 制造商:Arduino 产品:Evaluation Boards 工具用于评估:ATMega32U4 核心:AVR 接口类型:I2C, UART, USB 工作电源电压:6 V to 20 V
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功能描述:开发板和工具包 - AVR Motor Contrl. Kit for CAN and LIN app. RoHS:否 制造商:Arduino 产品:Evaluation Boards 工具用于评估:ATMega32U4 核心:AVR 接口类型:I2C, UART, USB 工作电源电压:6 V to 20 V
ATAVRMC321
功能描述:开发板和工具包 - AVR Motor Contrl. Kit for low cost app. RoHS:否 制造商:Arduino 产品:Evaluation Boards 工具用于评估:ATMega32U4 核心:AVR 接口类型:I2C, UART, USB 工作电源电压:6 V to 20 V
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功能描述:开发板和工具包 - AVR Motor Contrl. Kit CPU Intens Algorithm RoHS:否 制造商:Arduino 产品:Evaluation Boards 工具用于评估:ATMega32U4 核心:AVR 接口类型:I2C, UART, USB 工作电源电压:6 V to 20 V
ATAVR-MICTOR38
功能描述:集管和线壳 Connector 4 nexus trace connect 4 AVR RoHS:否 产品种类:1.0MM Rectangular Connectors 产品类型:Headers - Pin Strip 系列:DF50 触点类型:Pin (Male) 节距:1 mm 位置/触点数量:16 排数:1 安装风格:SMD/SMT 安装角:Right 端接类型:Solder 外壳材料:Liquid Crystal Polymer (LCP) 触点材料:Brass 触点电镀:Gold 制造商:Hirose Connector
ATAVRONEKIT
功能描述:电路内置调试器 Debug and program all AVR32 devices
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