參數(shù)資料
型號(hào)： DRM022
英文描述： 3-Phase BLDC Drive Control with Hall Sensors Reference Design
中文描述： 三相無(wú)刷直流電機(jī)驅(qū)動(dòng)控制霍爾傳感器參考設(shè)計(jì)
文件頁(yè)數(shù)： 17/66頁(yè)
文件大小： 1157K
代理商： DRM022
System Description
Volt-per-Hertz Control Technique
DRM020 — Rev 0
Designer Reference Manual
MOTOROLA
System Description
17
The
control process
is following:
The state of the sensors is periodically scanned in the software timer
loop, while the speed of the motor is calculated utilizing the Input
Capture interrupt. According to the operating mode setup and state of
the control signals (Start/Stop switch, Forward/Reverse switch, speed
potentiometer), the speed command is calculated using an
acceleration/deceleration ramp. The comparison between the actual
speed command and the tacho speed generates a speed error E. The
speed error is brought to the speed PI controller that generates a new
corrected motor frequency. Using a V/Hz ramp, the corresponding
voltage is calculated. The PWM generation process calculates a system
of three-phase voltages with required amplitude and frequency, includes
dead time and finally, the 3-phase PWM motor control signals are
generated.
The DC-Bus voltage and DC-Bus current are measured during the
control process. They are used for over-voltage and over-current
protection of the drive. The over-voltage protection is performed by
software while the over-current fault signal utilizes a fault input of the
microcontroller.
If any of the above mentioned faults occurs, the motor control PWM
outputs are disabled in order to protect the drive and fault state of the
system is displayed.
WARNING:
It is strongly recommended to use an opto-isolation (optocouplers
and optoisolation amplifiers) during the development time to avoid
any damage to the development system.
2.3 Volt-per-Hertz Control Technique
The drive is designed as a “Volt-per-Hertz“ drive. It means that the
control algorithm keeps constant magnetizing current (flux) of the motor
by varying the stator voltage with frequency. The commonly used
Volt-per-Hertz ramp of a 3-phase AC induction motor illustrates
Figure 2-2
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
相關(guān)PDF資料
PDF描述
DRM023 3-Phase AC Induction Motor Vector Control Using 56F805
DRM025 3-Phase BLDC Motor Control with Hall Sensors Using 56F805
DRM026 3-Phase BLDC Motor Control with Sensorless BACK-EMF ADC Zero Crossing Detection Using 56F805
DRM027 3-Phase Sensorless BLDC Motor Control with Back-EMF Zero Crossing Detection Using 56F805
DRM028 Sensorless BLDC Motor Control Using the MC68HC908MR32
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