參數(shù)資料
型號(hào)： 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(wú)刷直流電動(dòng)機(jī)控制傳感器反電動(dòng)勢(shì)過(guò)零檢測(cè)ADC的使用56F805
文件頁(yè)數(shù)： 38/66頁(yè)
文件大?。?/td> 1157K
代理商： DRM026
Software Design
Designer Reference Manual
DRM020 — Rev 0
38
Software Design
MOTOROLA
4.3.6 PWM Generation
This process generates a system of three phase sinewaves (or
sinewaves with addition of third harmonic component) shifted 120
o
each
other.
The calculation is based on the wave table stored in ROM of the
microcontroller. The table describes either a pure sinewave or sinewave
with third harmonic addition. The second case is often preferred
because it allows to generate a first harmonic sine voltage equal to the
input AC line voltage. Because of sine symmetry only one quadrant of
the wave period is stored in the table. The wave values for other
quadrants are calculated from the first one. The format of the stored
wave table data is from
#0x00
(for ZERO Voltage) up to PWM
Modulus/2 (for the 100% Voltage). Thus the proper data scaling is
secured.
It is important to note that 50% PWM (or 50% of PWM Modulus loaded
to the corresponding PVAL registers) corresponds to the ZERO phase
voltage. But in the wave table, the ZERO phase voltage corresponds to
the number
#0x00
. Therefore, the fetched wave value from the table
must be added to the 50% PWM Modulation for quadrant 1 and 2 or
substracted from the 50% PWM Modulation for quadrant 3 and 4 (see
point 5 of the process description). Thus the correct PWM value is
loaded.
The input parameters of the process are:
The table increment,
Table_inc,
that is used for the wave
pointer update
Amplitude,
Amplitude,
of the generated inverter voltage
The output parameters of the process are:
PWM value for phase A: PVAL1 register
PWM value for phase B: PVAL3 register
PWM value for phase C: PVAL5 register
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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