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Datasheet GS001 PDF ( 特性, スペック, ピン接続図 )

部品番号 GS001
部品説明 Getting Started
メーカ Microchip Technology
ロゴ Microchip Technology ロゴ 
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GS001 Datasheet, GS001 PDF,ピン配置, 機能
GS001
Getting Started with BLDC Motors and dsPIC30F Devices
Author: Stan D’Souza
Microchip Technology Inc.
INTRODUCTION
As a means of reducing high energy and maintenance
costs in motor control applications, BLDC motors are
seeing a resurgence in applications where efficiency
and reliability are important. The dsPIC30F motor con-
trol devices are ideally suited to drive and control a
wide range of BLDC motor types, in a large number of
applications. Microchip has developed a number of
solutions using the dsPIC30F and BLDC motors. This
document will help you select an appropriate solution
for your BLDC motor application.
BLDC MOTOR BASICS
DC brush motors have a permanent magnet on the
stator with the motor winding on the rotor. During rota-
tion, the current in the windings is reversed using
mechanical carbon brushes and a commutator located
on the rotor. The BLDC motor has permanent magnets
on the rotor with the electrical windings on the stator.
The first obvious advantage of the BLDC motor is the
elimination of the mechanical commutator and
brushes, which significantly improves mechanical
www.DataSheeraetl4slUioa.bcoiglimtiyv.eThriesecomtomustpaatorkrinagn,d
brushes in DC
so eliminating
motors
these
components means that BLDC motors can operate in a
harsh environment. The I2R heat losses in the windings
of a BLDC motor are now on the stator and can be
dissipated very easily. Consequently, efficiency of the
BLDC motor is vastly improved.
There are, however, some challenges when spinning a
BLDC motor. Firstly, a revolving electrical field has to
be created in the windings, which also has to be well
aligned with the magnetic field on the rotor. The
efficiency of the BLDC motor depends largely on the
alignment of the revolving electrical field to the
magnetic field on the rotor. To sense the magnetic field,
Hall sensors are normally used. Based on the signal
presented by the Hall sensors, the windings are appro-
priately excited. As the speed of the rotor increases,
however, there is a certain amount of lag between the
voltage excitation and the current effect on the
windings due to the inductance of the windings. To
overcome this lag, the voltage is initiated a little in
advance. This phenomenon is known as phase
advance and is implemented mainly in software at high
speeds of rotation. The result of phase advance is
better efficiency in the BLDC motor operation.
Sensored BLDC Motor Control
When driving a BLDC motor, it is important to know the
position of the magnetic rotor with reference to the
stator. Most commonly, Hall effect sensors are used to
generate feedback on the rotor position. This type of
control is called sensored BLDC motor control. Most
BLDC motors have three windings. Based on the
position of the magnetic rotor, two windings are ener-
gized at a given time with each phase conducting for
120 electrical revolution degrees, resulting in six
distinct combinations of energization. This type of drive
is called “trapezoidal” or “six-step commutation”.
SIX-STEP COMMUTATION
Figure 1 depicts a typical six-step commutation
scheme with the Hall sensor output overlay. Six-step
commutation offers a simple, yet efficient, method of
driving a BLDC motor. Hall A (HA), Hall B (HB) and Hall
C (HC) sense the position of the rotor with respect to
the windings, R, Y and B. Depending on the Hall sensor
reading from 1 to 6, an appropriate pair of windings is
driven high and low with the third winding not driven.
Each 360 degree electrical cycle is broken down to six
60 degree electrical sectors, in which one winding is
driven high, a second is driven low and the third is not
driven. Example: In Hall position 6 or sector 1, the R
winding is driven high while the B winding is driven low
and the Y winding is not driven. By reading the Hall
sensors, the six-step commutation algorithm can very
easily be implemented in software.
FIGURE 1:
TYPICAL SIX-STEP
COMMUTATION
HA
R 60°
HB
Y
HC
B
Sector 5 0 1 2 3 4 5 0 1
Hall 5 4 6 2 3 1 5 4 6
© 2005 Microchip Technology Inc.
DS93001A-page 1

1 Page



GS001 pdf, ピン配列
dsPIC30F APPLICATION NOTES
The following are some applications notes on BLDC
motor control with the dsPIC30F that will help you jump
start your BLDC motor control project
AN957, “Sensored BLDC Motor Control
Using dsPIC30F2010”
This application note describes a simple open and
closed-loop solution to control a sensored BLDC motor
using a 28-pin dsPIC30F2010. The solution described
uses the six-step commutation method described
above to rotate and control the sensored BLDC motor.
The hardware platform used is the PICDEM™ MC LV
Board. With minor modifications, this application note
can be used with any other hardware platform from
Microchip (see the following section on motor control
boards). The firmware, with minor modifications, can
also be used with any motor control dsPIC30F device.
The dsPIC30F2010 is ideally suited for this application
due to on-chip availability of the motor control PWM,
Hall sensor and QEI input modules and the ability of the
DSP engine to compute multiple PID control loops.
AN901, “Using the dsPIC30F for
Sensorless BLDC Control”
This application note describes how to implement
sensorless control of a BLDC motor using the back EMF
detection technique mentioned above. The back EMF
voltage is attenuated and fed to the ADC inputs of the
dsPIC® Digital Signal Controller (DSC). The high-speed
ADC is then used to detect the zero crossing. This tech-
nique provides a very efficient control method for starting
and running a sensorless BLDC motor with a minimum
www.DataSheeotf4Uco.cmomponents. The hardware used is a dsPICDEM™
MC1 Motor Control Development Board used in con-
junction with either a dsPICDEM MC1L 3-Phase Low-
Voltage Power module or a dsPICDEM MC1H 3-Phase
High-Voltage Power module.
A dsPIC30F6010 device is used on the MC1 board in
this application. The application note describes in detail
how to start and run a sensorless BLDC motor. The
control method, however, is general enough to work
with any BLDC motor available in the market. Details
are provided to assist you in configuring the 45 param-
eters needed to start and run the BLDC motor. All 45 of
these user parameters can be set using the LCD and
push buttons available on the MC1 development board.
GS153
The firmware supports four different control modes and
two starting modes. The hardware drive section is
connected via a 37-pin D-type connector to either a
high-voltage or low-voltage power module, which
allows for BLDC motors that can operate in the voltage
range from 10 to 400 VDC. The firmware can also be
modified to work with any motor control dsPIC30F
device.
The dsPIC30F6010 is ideally suited for this application
because it includes on-chip motor control PWM, Hall
sensor and QEI input modules, along with a fast ADC
required to sample the back EMF and detect zero
crossing. A powerful DSP engine is available to
compute multiple PID control loops.
AN992, “Sensorless BDLC Motor Control
Using dsPIC30F2010”
This application note takes the application described in
AN901 one step further and provides a low-cost, yet
efficient, implementation on the smallest dsPIC30F
motor control device available, namely the 28-pin
dsPIC30F2010 with 12 Kbytes of program memory and
512 bytes of RAM. The hardware is simplified and uses
the stand-alone PICDEM™ MC LV board as the
hardware platform.
Because the PICDEM MC LV board has no LCD and
the dsPIC30F2010 has limited I/O, the 45 user param-
eters are set using a PC via the serial port and a
HyperTerminal link.
The PICDEM MC LV only supports voltages from 10 to
40 VDC, hence, only low-voltage BLDC motors are
able to run on this board. However, the technique used
in this application can be extrapolated. If higher voltage
and current drivers are provided to support higher volt-
age and current, then a similar, but modified hardware
can be used to run BLDC motors from 40V to 400V DC.
The dsPIC30F2010 is ideally suited for this application.
It includes on-chip motor control PWM, Hall sensor and
QEI input modules, along with a fast ADC to sample the
back EMF and detect zero crossing. A powerful DSP
engine is available to compute multiple PID control
loops.
© 2005 Microchip Technology Inc.
DS93001A-page 3


3Pages


GS001 電子部品, 半導体
GS153
DIFFERENT dsPIC30F BASED
HARDWARE PLATFORMS FOR BLDC
MOTOR CONTROL
You can use the Selection Summary (Table 1) to select
different Microchip hardware platforms for specific
application needs. Note that although there are a
limited number of dsPIC DSC devices supported on a
given hardware platform, you can build a daughter
board based on the motor control dsPIC30F device
needed for your application and plug it into the avail-
able socket or header pins on the PICDEM MC LV or
MC1 development boards.
TABLE 1: SELECTION SUMMARY
BLDC
Motor Type
Operating
Voltage
Range (VDC)
Power
Range
(Watts)
Application
Note
Hardware Platform
Recommendations
Sensored
10 to 40
50 to 200
AN957 PICDEM™ MC LV
Sensored
Sensored
Sensorless
40 to 400
10 to 48
10 to 40
Up to 800
Up to 600
AN957
AN957
AN992
MC1 and High-Voltage Power module
MC1 and Low-Voltage Power module
PICDEM MC LV
Sensorless
Sensorless
Sensorless
40 to 400
10 to 48
40 to 400
Up to 800
Up to 600
As per user’s
design
AN901
AN901
AN992
MC1 and High-Voltage Power module
MC1 with Low-Voltage Power module
PICDEM MC LV (user modified for
high voltage)
Supported
dsPIC30F
Devices
dsPIC30F2010
dsPIC30F3010
dsPIC30F4012
dsPIC30F6010
dsPIC30F6010
dsPIC30F2010
dsPIC30F3010
dsPIC30F4012
dsPIC30F6010
dsPIC30F6010
dsPIC30F2010
dsPIC30F3010
dsPIC30F4012
ORDERING INFORMATION AND NUMBERS
PICDEM™ MC LV Development Board: DM183021
Power Supply (optional): AC002013
Motor with cables: AC300020
“PICDEMMC LV Development Board User’s Guide” (DS51554)
www.DataSheet4U.com
dsPICDEM™ MC1 Motor Control Development Board: DM300020
“dsPICDEMMC1 Motor Control Development Board User’s Guide” (DS70098)
dsPICDEM™ MC1H 3-Phase High-Voltage Power Module: DM300021
“dsPICDEMMC1H 3-Phase High-Voltage Power Module User’s Guide” (DS70096)
dsPICDEM™ MC1L 3-Phase Low-Voltage Power Module: DM300022
“dsPICDEMMC1L 3-Phase Low-Voltage Power Module User’s Guide” (DS70097)
DS93001A-page 6
© 2005 Microchip Technology Inc.

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