Questions tagged [vector-control]

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How to design PI controller for the field weakening control of the three phase induction motor?

In the book called Electric Motor Control in the Chapter 8 I have found following field weakening strategy for the three phase induction motor The aforementioned field weakening strategy is based on ...
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27 views

FOC VFD for PMSM drive

I have a question related to field-oriented control FOC. Why is FOC (Vector Control) also called variable frequency drive (VFD) even though frequency variation is not spoken about during the analysis?
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1answer
91 views

How to measure precision speed of bldc motor with encoder which has 1024 pulse per revolution

I am trying to control bldc with SVPWM based FOC method.I have a bldc motor with 1024 pulse encoder. I calculate speed in encoder pulse interrupt. But i can't directly calculate d(encoder pulse)/dt. ...
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41 views

How can I increment PWM resolution for PMSM FOC control?

The pwm resolution effect torque ripple value. My motor should be turn low speed . When the motor is turning slowly , the effect can be seen barely. I have 1024 pulse encoder per tour . The hardware ...
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0answers
55 views

SVPWM: space vector generation star point shifting - effects?

I keep seeing that the space vector generation (as a part of a FOC) is generated around DC Link / 2. What effects would be expected if the (in this case isolated) star point were permanently shifted? ...
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48 views

How is implementing FOC on SVPWM switching algorithm?

I have that running SVPWM algortihm with no error. I tried to implement FOC algorithm that switching metod. But I failed. I measure phase currents (Ia , Ib , Ic) when low side switching time. And ...
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0answers
53 views

TVC PID Controller how to adjust angle and thrust?

Hi there I wanted to simulate a rocket landing like for example the falcon 9. I was able to write myself an simulation in which on every loop turn I adjust the angle and thrust. Now this is for school ...
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0answers
37 views

Is V/F maintained constant even in field oriented control or vector control drive of PMSM motors?

I understand that in scalar control V/F is maintained constant below rated speed, as Vector control drive is also a variable frequency drive, I would like to know whether V/F is maintained constant ...
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0answers
57 views

Motor vector control and parameters estimation

Vector control methods require good estimation of magnetic flux. In Direct Torque Control it would vector of stator flux. In order to estimate it properly one has to know motor parameters such as ...
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1answer
63 views

What is the effect of MOSFET switching frequency on PMSM FOC drive?

• I have developed FOC drive software for PMSM motor used in an electric scooter. • Drive works fine but there is noise on the initial start-up. In order to remove it, I tried many different ...
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1answer
43 views

What would be the expected accuracy in speed and position of a sensorless vector drive motor?

I am looking to do some speed-varying torque tests on a system and drive it with a sensorless vector drive motor. However I'm now unsure of what to expect for accuracy on speed or position at low ...
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1answer
139 views

DC current limiting in FOC for PMSM

I have implemented field oriented control for pmsm motor . FOC algorithm takes care of phase current limiting. Can anyone guide me how can we do battery current limiting in foc ?
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58 views

Necessary Bandwidth of Current Shunt Amplifier in FOC + SVPWM motor control

I am designing a BLDC motor controller using sensorless FOC + SVPWM, planning to use a shunt to measure current, and using an observer to determine the rotor angle. I was wondering, what bandwidth do ...
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1answer
50 views

Why were the phase currents taken instead of voltage as inputs in the space vector moduation method?

Why is it that the currents (ia,ib,ic) are taken as inputs, instead of voltages (va,vb,vc), when at the end, you need to create 3 phase stator voltages for the rotor to catch up with?
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2answers
707 views

Torque and Flux Current

It is said that vector sum of flux and torque current equal to total current drawn by the motor but there are also some currents flowing due to copper losses and rotor leakage inductance. In my ...
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1answer
1k views

How does HFI (high frequency injection) work with BLDC motors

How does HFI work with BLDC motors. In this video: VESC HFI: Sensorless position tracking at zero speed he explains how HFI works, however i don't get how it can work with motors that have trapezoid ...
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1answer
721 views

Difference between SVM and sinusoidal PWM in BLDC

In this answer Answer to question regarding difference between 6-step and FOC, the author said: "Likewise if you have gone to the effort to implement a FOC you might as well implement a SVM block to ...
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0answers
58 views

Slip Frequency Factors In Indirect Field Oriented Control

I am attempting to configure a asynchronous motor with a IFOC drive. I have an encoder on the motor, however I have been struggling with getting the drive parameterized to operate correctly. My ...
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0answers
353 views

3-phase BLDC motor resolver problem

I am trying to drive a 3-phase BLDC motor with FOC and have some questions about obtaining resolver offset angle. In the driver I used ABC notation for phases and FOC accepts A phase as 0 angle ...
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3answers
93 views

Vector Control in Induction Motors

Can vector control in induction motors be considered as power factor correction ? From my researchs, it seemed to me angle between rotor and stator flux is 90 degree when load is purely resistive (...
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2answers
79 views

Vector Control & Slip

I know slip in induction motor determine the current and torque but the point I want to ask, when controlling with vector control it is said stator and rotor flux is always kept with 90 degrees apart ...
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4answers
1k views

Phasor vs Vector vs Space Vector

I wonder what is the difference between a Phasor, a Vector and a Space Vector? A phasor is also a rotating vector in space then it means that a space vector is same as a phasor? Also by definition a ...
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1answer
791 views

FOC sensor vs sensorless

I am trying to understand the hardware difference between the sensored and sensorless FOC 3-phase Induction Motor Drive circuit. So far what I understand is that FOC require following sensors: 1. ...
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1answer
5k views

Instantaneous vector sum of three phases 120 apart is not zero?

Vector sum of equal 3 phases 120 degree apart is zero and serves as a neutral. However, while drawing instantaneous vectors of the three phases, they summed up all together to give a vector. I have ...
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2answers
692 views

Current increase in induction motor

I have an induction motor which is fed by a three phase inverter. I am trying to use vector control with d-axis aligned with the rotor flux vector. I have a load which increases its torque as the ...