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  1. E

    Stator Windings Clarification

    I want to understand the following configuration suppose if the stator is 3 phase winding (2 pole stator) let us say a,b,c. I know they will be placed 120Degress apart, but if i make it a 6 phase winding(4 pole stator), how they can still maintain that 120Degrees? I know very little about stator...
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    An1017A application note microchip

    The AN1017A application note is the sinusoidal control of BLDC motors. I am implementing it but i have few questions. The source code provided for that refers to two terms phaseoffsetCW and phaseoffsetCCW. I am confused with this. The document says this is added for symmetry of sine wave can...
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    Relation between pwm frequency and motor speed

    Please tell me the relationship between the motor speed and pwm frequency. To increase the speed can i simply increase the frequency? How much duty cycle should be set? Please help. It is for a BLDC motor.
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    Training on motor control

    I want a training course on motor control methods like space vector modulation, field oriented control etc. Even if paid is ok. Can anyone suggest me some good one? Please help.
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    3 phase driver as generator system

    Hi, From a 3 phase bridge driver circuit we can convert from electrical energy to mechanical energy. I know the 3 phase bridge driver circuit consists of Mosfets and when switched correctly will convert from electrical energy to mechanical energy. But i wanted to know how the same circuit can...
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    Motor control application

    On my own i want to do one motor control application using ST micro controller. I am searching for an evaluation board and found one. To get started what wattage of BLDC motor shall i select. Please guide me.
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    Frequency and time confusion

    Whenever i am dealing with frequency of signals in micro controllers. I am always getting confused with calculations. Should i proceed thinking of the signals completely in terms of frequency or completely in terms of time duration. I get terribly confused. How should i handle? Any...
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    Can Power Supply Sink Current

    I wanted to know this, suppose if i am testing any motor application using DC power source during the development stage, the circuit will convert electrical energy to mechanical energy. But there are cases where reverse current can flow that is current can flow into the DC source. Am I correct...
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    RAM address allocation

    Very basic question let us say i have two RAM variables x1, x2 and let us say the micro controller generates address A1 for x1 variable and A2 address for x2 variable when i compiled and linked for the first time. When i link the next time how does it generate the same address A1 for x1 and A2...
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    Motor Construction Diagram

    I have always confused myself with motor construction. To clarify it i have drawn a hand diagram of motor using an online tool. I am sorry i could not draw a very good picture. But please tell me if the concept is correct. It consists of stator with 3 phase winding and rotor with two poles of...
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    Difference between Brown out and Power on reset

    I am bit confused with these terms as Brown out reset is set when the voltage is less than Vdd. So when you are powering ON it should go from lower voltage to Vdd. In this case how micro chip handles?
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    Driving of 3 phase motor

    Two questions i have regarding this. a. When driving a 3 phase magnet using hall sensor, we use 6 pwm legs, 3 for and 3 for low side. When ever i have seen commutation diagram three voltages are mentioned like high, float and negative. I am able to understand positive that will be Batter+ and...
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    Clarke and Park Transformations

    When doing Clarke and Park Transformations what is the precision to which we should try to achieve. I mean to say after decimal how many digits we should consider? How does it affect the system if we take less precision?
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    Interrupt latency time calculation

    Is there any standard procedure for calculating interrupt latency? I mean to say can we estimate accurately the time it takes to go to the interrupt after the trigger. I am referring to dspic33ev family. I am finding the timing keeps varying and very difficult to design the system. Please advise.
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    Pull up resistors in PIC Microcontrollers

    This is a general question and in particular to pic, internal to micro controllers there are pull up, pull down, weak pull up, weak pull down registers for enabling and disabling. I never touch this registers in general. How important these registers. Can someone please explain in case if i...
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    Bit manipulation in pic controllers

    I need to check for a flag like TRUE or False. Can i use char data type or bit type? By creating bit type is it advantageous? I mean to say will it reduce execution time? Also i want the code to be portable. Please advise.
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    One micro second execution

    To perform high critical time tasks is it ok to create 1 micro second timer interrupt. Is it recommended? I am asking this in general for all controllers. The sytem will end up doing only timer task in this case?
  18. E

    Microcontroller execution time

    I have a timer and if i configure it for 1ms the execution time of main function from the beginning to end will be less compared to the same timer configured for 500 micro seconds. Is it correct? Or there will not be any difference. The controller is a pic. Please suggest.
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    Difference between phase register and pdc register

    I am bit confused between the phase register and the pdc register in dpspic33 family. Can somebody please explain me the difference with some diagram? I am providing the link of the data sheet as i could not upload the datasheet because of size...
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    Oscillator Cofiguration microchip

    I have seen the following sample code from microchip _FOSCSEL(FNOSC_FRC); _FOSC(FCKSM_CSECMD & OSCIOFNC_OFF & POSCMD_XT); // Clock Switching is enabled and Fail Safe Clock Monitor is disabled // OSC2 Pin Function: OSC2 is Clock Output...
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