参数资料
型号: CAN-100
厂商: Fujitsu Semiconductor America Inc
文件页数: 66/104页
文件大小: 0K
描述: BOARD EVAL RS232 100QFP
其它有关文件: CAN-100 Schematic
标准包装: 1
系列: FR
类型: MCU
适用于相关产品: MB91F267N
所含物品: 板,BLDC 电机,线缆,电源
产品目录页面: 722 (CN2011-ZH PDF)
相关产品: 865-1091-ND - IC MCU FLASH 128KB FLASH 64LQFP
其它名称: 865-1102
AN07-00180-3E
4.2
How does the BLDC motor rotate?
The BLDC motor has three phases different by 120°. As shown in Figure 4-2 Names of the respective
elements ”, the phases are called the U -phase, V-phase, and W-phase respectively.
The switches on the driver circuit are respectively called U-High, U-Low, V-High, V-Low, W-High, and
W-Low and connected as outputs from the microcontroller. The hall elements for detection of the rotor
position are respectively called Hall-U, Hall-V, and Hall-W and connected as inputs to the
microcontroller.
V-High
U-Low
W-High
Hall-W
U-phase
Hall-U
V-phase
Hall-V
V-Low
W-Low
W-phase
Microcontroller
Figure 4-2 Names of the respective elements
By turning on/off the switches, the directions of the currents conducted to the motor are controlled. Two
of the three coils are set to positive or negative to generate a magnetic field for motor rotation.
The hall elements are used to detect the position of the rotor by 60° and the detection is represented with
1 or 0. According to their values, the switches are turned on/off. On detection of the hall elements, the
High side of the phase corresponding to it is turned ON, and on no detection, the Low side is turned ON.
Figure 4-3 120° conduction method time chart shows their relationship.
This way of driving control is called the 120° conduction method (square-weave control).
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