1. SPEED CONTROL OF BLDC MOTOR WITH
SIMPLE COMMUTATION ON PIC 24HJ128GP-310
PLATFORM
Speed control of BLDC motors are increasingly demanded in many
of the industrial and aerospace application. The conventional methods of
implementing commutation for the BLDC motors are the Trapezoidal
Commutation and Sinusoidal Commutation. Trapezoidal Commutation
although has the inherent advantage of simpler implementation and
lesser switching losses, has the disadvantage of increased torque ripple.
Sinusoidal Commutation on the other hand offers theoretically zero
torque ripple, however results in increased switching loss and
implementation complexity. The paper proposes a commutation scheme
which combines the advantages of both Trapezoidal and Sinusoidal
commutation. The proposed commutation offers the advantage of
reduced switching loss, reduced torque ripple and does not require
complex implementation.
The proposed commutation is used in the speed control of BLDC
motor. The simulation of the speed control of BLDC motor is carried out
using MATLAB/SIMULINK. The implementation of the proposed scheme
and the speed control of BLDC motor are to be implemented on a
24HJ128GP310 PIC platform. The validation of the experimental results
against the simulation results are also within the scope of the project.

2. Part Number : DV164037 - MPLAB ICD 3 with Explorer 16
Kit

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4. Standard Pricing
Availability:
Quantity
USD per
Unit
1+
299.9
9
In Stock:
101
More estimated to ship on:
12-Apr-2011

5. Question and Answer from Yahoo! Answers
•
Zombie
Q: What is the difference betwwen a 3-phase stepper motor with encoder and a
dc-brushless motor?
What is the difference between a 3 phase 16step/rev stepper motor in comparision
to a DC-brushless motor with ...
A: In some configurations there is very little difference. Reasons follow: Stepper
motors by continuous encodings or a stopped (addressing) code provide a rotating
field or even a stopped field by converting digital BCD counts into a code that by
a planned coincidence causes the fields' electromagnetic poles to N and S
positions to attract the S and N armature poles to a desired orientation, ...
•
Deepak K
Q: Can I control the speed of a BRUSHLESS DC MOTOR using voltage control
technique?
The voltage control technique is generally used for DC motors with brushes. Can
I use the same technique for ...
A: Yes. If the motor has no built-in commutator or control circuitry, the external
circuitry can be designed to both control voltage and provide commutation. If the
motor has an internal electronic commutator circuit, the voltage can probably be
controlled externally over some range, but the external control circuitry must be
designed to avoid interfering with the internal circuitry.
•
Deepak K
Q: Will I be able to control the speed of a BRUSHLESS DC MOTOR using
voltage control technique.?

6. The Voltage control technique is generally used for DC motors which have
brushes for commutation. Can I use the ...
A: I don't think so. I am not expert in this area but all the brushless DC motors
we use are 3 phase. You have to turn the phases on in a specific sequence and you
need motor position feedback from hall effect sensors to determine when you do
that. Perhaps there are other kinds though.
•
Lim K
Q: How to I pre-empt DC brushless motor defect?
Hi, I would like to find out how can I have a simple test on the DC brushless
motor ...
A: A few things: Measure no-load RPM - if lower than spec, it may be on its way
out. Measure current-draw as compared to a new unit. If significantly higher (or
lower) may be on its way out. Measure torque. Same as above. Check for
vibration. Check for excessive heat. It would also be useful to know the ...
•
Jonny Mick
Q: when designing a brushless dc motor-what ways can efficiency be improved?
im possibly interested in building a brushless dc motor for a solar powered cart
project, what things should be ...
A: ah, frictionless bearings and wear-never materials running enclosed in a
vacuum minimizing friction and needing no fans to cool. In reality, fudge on the
above to achieve near-success
•
ghwenty...
Q: Links showing how a brushless dc motor works?
Any websites or links where I can find a picture, schematic or animation to show
how a brushless dc ...

7. A: en.wikipedia.org/wiki/Brush... has a good write up but this link has a great
animation that will make it all make sense to you, electronics.howstuffworks.c...
gudluk
•
Jake
Q: is it possible to make simple brushless dc motor controllers?
given that my resources are micro-controllers and any relativity inexpensive
discrete components or chips, is it possible to ...
A: Depends on motor to some extent, but yes. To start, you need schematic/spec
sheet on motor to see how it is wound and is to be controlled, including feedback
if any. Then, just google. Try something like "pic microcontroller brushless dc
motor" PIC has several application notes on it, but lots of people do. App notes ...
•
Khairul...
Q: A very simple circuit consist microcontroller at89s52 to control speed and
direction for brushless dc motor?
i have difficulties in designing a circuit to run a sensorless 24V brushless dc
motor.. anyway, i have ...
A: I assume you mean a three phase brushless motor. The drive is three separate
phases 120 degrees apart, and it might be a square wave or a sine wave depending
on the motor. Thius it uses 6 output ports. If it is a sine wave it will probably be
generated by a PWM modulator and LPF combination for each phase. It becomes
very similar to ...
•
Adam
Q: What would you need to do to a brushless DC motor to turn it into a
generator?
I am new to learning about generators and dont know much about DC electricity.
I am experimenting with building ...

8. A: Hi, First of all,a brushless DC motor needs an alternative arrangement that
could cause the reversal of input direct current for developing a constant torque in
armature.This may be achieved with the help of any electronic inverter connected
to the input terminals of motor as the brushes in a dc motor actually act as
mechanical inverter. Now,to run a dc motor as generator: Rotate ...
•
ericnutsch
Q: Can a brushless DC motor be used as a generator ?
I understand that a brush-less DC motor must have a controller which generates
AC current to drive the unit ...
A: There are 2 types of brushless motors. 1 is actually an AC motor, 3- phase,that
is driven from an inverter from DC to AC. It is common in such as electric
powered models, and varying the AC frequency is used to control speed. Such a
motor might be used as an alternator to produce AC electricity. Then there is the
brushless DC & ...
More from Yahoo! Answers »
Q&A from Askville
• "Where can I get a replcement speed controller for a ...
...CANBus 2.0B, or an asynchronous serial port. User selectable profiling modes
include Scurve, trapezoidal, velocity contouring and electronic gearing. Servo
loop compensation utilizes a full 32-bit position error, PID with velocity and
acceleration feedforward, integration limit, and dual bi-quad filters for
sophisticated motion control of complex loads. Magellan works with Pro-
Motion®, a Microsoft Windows®-based prototyping ...
Read more: http://www.rightautos.com/topic/DC_brushless_motor/Q-and-
A#ixzz1IMGl0enJ