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| 型號： | DRM025 |
| 英文描述： | 3-Phase BLDC Motor Control with Hall Sensors Using 56F805 |
| 中文描述： | 三相無刷直流電動機控制霍爾傳感器使用56F805 |
| 文件頁數(shù)： | 50/66頁 |
| 文件大小： | 1157K |
| 代理商： | DRM025 |
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Software Design
Designer Reference Manual
DRM020 — Rev 0
50
Software Design
MOTOROLA
4.6 Open Loop Drive
The system presented in this application note can also run in an open
loop mode. In this case, the actual motor speed is not measured and the
generated voltage frequency directly corresponds to the externally set
speed command and is not corrected by any controller according to the
actual motor speed.
Because the motor is asynchronous, the actual motor speed varies with
the mechanical motor load. The higher mechanical load the higher slip
of the motor and the lower motor speed. Therefore, the speed precision
of the drive is not so high. For some application, such behaviour of the
drive is not acceptable (like washing machine), some other can
withstand it. An example of the application can be a fan, a compressor,
a pump, etc., where performance of the open loop drive is sufficient. The
advantage of the open loop drive is its relative simplicity of both
hardware and software design compared to the closed loop system.
The open loop system design has the following modifications:
The hardware design doesn’t require the speed transducer and speed
sensing circuitry.
The software for Open Loop drive requires the following modifications
(see
Figure 4-2
):
Remove Process PI Controller
Remove Process Speed Sensor and disable IC Interrupt
Load an output of the Process Acceleration/Deceleration ramp to
an input of the Process Volt-per-Hertz ramp (Set variable
V_out
= V_com_actual
)
In the provided software, the open loop control can be set during the
software initialisation:
Speed_control = OPEN_LOOP; /* for open speed control loop */
or
Speed_control = CLOSED_LOOP; /* for closed speed control loop */
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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| DRM10 | 功能描述:DIP 開關/ SIP 開關 BCD 10 POS RoHS:否 制造商:Omron Electronics 位置數(shù)量:10 開關類型:DIP 執(zhí)行器:Rotary 端子節(jié)距:2.54 mm 觸點形式: 端接類型:Solder Pin 電流額定值:100 mA 電壓額定值 DC: 工作溫度范圍: 安裝:Through Hole |
| DRM1004 | 功能描述:DIP 開關/ SIP 開關 ROTARY DIP SWITCH PLASTICSHAFT RoHS:否 制造商:Omron Electronics 位置數(shù)量:10 開關類型:DIP 執(zhí)行器:Rotary 端子節(jié)距:2.54 mm 觸點形式: 端接類型:Solder Pin 電流額定值:100 mA 電壓額定值 DC: 工作溫度范圍: 安裝:Through Hole |
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| DRM10C | 功能描述:SWITCH DIP MINI SHAFT 10POS T/H RoHS:否 類別:開關 >> DIP 系列:DR 特色產(chǎn)品:RDM Series Rotary DIP Switch 標準包裝:70 系列:RDM 電路:十六進制 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 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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