參數(shù)資料
型號: DRM013
英文描述: USB Security Key Reference Design Designer Reference Manual
中文描述: 安全密鑰的USB參考設(shè)計設(shè)計參考手冊
文件頁數(shù): 14/72頁
文件大小: 1177K
代理商: DRM013
Vacuum Cleaner Reference Design
Designer Reference Manual
DRM010 — Rev 0
14
Vacuum Cleaner Reference Design
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
permanent magnet motor. However, it has a wound stator that is
connected in series with the rotor windings. In dc applications, it is often
called a series wound dc motor. A universal motor is used in vacuum
cleaners because it can operate at very high speeds. Vacuum cleaner
motors operate at speeds up to 30,000 RPMs. The high-speed operation
is necessary to generate a strong suction using a small fan. An induction
motor is limited to speeds below 3600 RPMs.
Many vacuum cleaners have just a simple on-off switch for the motor
control. The penetration of electronic controls in vacuum cleaners is
higher in Europe and Asia. Most European canister vacuums have a
variable suction power knob or slider. The motor speed is controlled
using a triac with a simple firing control circuit. The firing control circuit
consists of a few discrete components, such as a diac, resistor,
capacitor, and potentiometer.
Today, a few of the more expensive high-end vacuum cleaner models
use microcontrollers (MCU). Microcontrollers are used to provide added
features for these sophisticated models, such as infrared or wired
remote control, status LEDs (light-emitting diode), and automatic suction
control.
In the near future, all vacuum cleaners might include a microcontroller,
since MCUs provide several benefits for the low-end models.
F
Freescale Semiconductor, Inc.
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.
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