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| 型號： | DRM026 |
| 英文描述： | 3-Phase BLDC Motor Control with Sensorless BACK-EMF ADC Zero Crossing Detection Using 56F805 |
| 中文描述： | 三相無刷直流電動機(jī)控制傳感器反電動勢過零檢測ADC的使用56F805 |
| 文件頁數(shù)： | 36/66頁 |
| 文件大小： | 1157K |
| 代理商： | DRM026 |
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Software Design
Designer Reference Manual
DRM020 — Rev 0
36
Software Design
MOTOROLA
4.3.2 Acceleration/Deceleration Ramp
The process calculates the new actual speed command based on the
required speed according to the acceleration / deceleration ramp.
During deceleration the motor can work as a generator. In the generator
state, the DC-Bus capacitor is charged and its voltage can easily exceed
its maximal limit. Therefore the DC-Bus voltage is measured and
compared with the limit. In case of deceleration over-voltage, the
deceleration is interrupted and the motor runs with constant speed in
order to discharge the capacitor. Then, the deceleration can continue.
4.3.3 Speed Sensor
The speed sensor process utilizes the IC function. It reads the time
between the following rising edges of the speed sensor output and
calculates the actual motor speed,
V_tacho
. Also, a software filter of the
speed measurement can be incorporated in the process for better noise
immunity. In this case the actual motor speed is calculated as average
value of several measurements.
4.3.4 PI Controller
The speed closed loop control is characterized by a measurement of the
actual motor speed. This information is compared with the reference set
point and the error signal is generated. The magnitude and polarity of the
error signal corresponds to the difference between actual and required
speed. Based on the speed error, the PI controller generates the
corrected motor frequency in order to compensate the error. The general
principle of the speed PI control loop is illustrated in
Figure 4-3
.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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| DRM10C | 功能描述:SWITCH DIP MINI SHAFT 10POS T/H RoHS:否 類別:開關(guān) >> DIP 系列:DR 特色產(chǎn)品:RDM Series Rotary DIP Switch 標(biāo)準(zhǔn)包裝:70 系列:RDM 電路:十六進(jìn)制 位置數(shù):16 觸點額定電壓:0.1A @ 42VDC 觸動器類型:用于工具旋轉(zhuǎn) 觸動器電平:凹槽式 安裝類型:通孔 方向:頂部觸動 可清洗:是 其它名稱:EG4977-5RDMAR16PIT |
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