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Questions tagged [pmsm]

permanent magnet synchronous motor

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PMSM motor current calculated by D axis and Q axis current

Now, I know d and q axis current can be calculated by phase current ia, ib, ic in a PMSM, via clarke transform and park transform. ialpha = sqrt(2/3) * (ia - ib / 2 - ic / 2) ibeta = sqrt(1/2) * (ib ...
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About how to extract back EMF from SMO(sliding mode observer), maybe I need a doctor for this question

The equations of PMSM on alpha-beta frame(2 fixed coordinate systems) are like this, ...
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0answers
24 views

permanent magnet synchronous motor Lagrangian in qd0 frame

I'm trying to derive a symplectic model for a permanent magnet synchronous motor (PMSM) in the rotating qd0 reference frame using a geometric integrator. For that purpose, I need the discrete-time ...
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2answers
45 views

Magnetic Flux loss in PM Motors

The PM motors specially BLDC or PMSM they get their armature energy from the permanent magnets on their rotors unlike the Induction Motors in which the armature gets its energy from the Stator ...
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Inverse LUT of flux-linkage maps for PMSM

I've been given the LUT of the flux linkages for an IPMSM in the dq-domain. \$\lambda_d = f_1(i_q, i_d)\\ \lambda_q = f_2(i_q, i_d)\$ The maps are obviously non-linear. The sampling has been done ...
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46 views

Control issues: Simulation of PMSM in FOC Model

I have been designing a model of an already existing actuator which is run in FOC with an SVPWM inverter and cascade speed-current control. Losses like eddy current or hysteresis, or switching losses ...
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1answer
362 views

BLDC (Brushless DC Motor) vs PMSM (Permanent Magnet Synchornous Motor)

The differences between BLDC and PMSM are very small and for what I have seen while reading about it, is not clear to many of us. Most of the articles I have read say that the main difference is that ...
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137 views

Do electric motors have the same efficiency when operating as generators?

Its in the title. I'm just curious and it turns out that either this is such a stupid question that no one has bothered to answer it, or i'm just not good at googling today. I guess I'm thinking ...
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66 views

initial position detection in BLDC compressor

We have designed an inverter board to control BLDC compressor(air conditioner).The board is up and running.we are controlling(trapezoidal control) the compressor in open loop (without considering back ...
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1answer
333 views

How to empirically tune DQ current PI controllers in BLDC/PMSM motor for vector control?

I need to experimentally set the \$k_p\$ and \$k_i\$ parameters of PI controllers for the DQ-axes of a vector controlled BLDC motor. I have been looking for papers and application notes proposing ...
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1answer
159 views

OpAmp for FOC current sensing on a BLDC/PMSM

How critical is this pull-up resistor to Vdd for current sensing in a Field Oriented Control of a BLDC or PMSM? Right now, I don't have that pull up...I'm running the shunt resistor voltage straight ...
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2k views

What does changing the throttle to a BLDC ESC actually do?

Background: I understand how the standard 50 Hz PWM protocol for hobby electronics works: varying the on-time from about 0.5 ms to 2.5 ms will throttle an actuator from roughly 0% to 100% thanks to ...
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293 views

Relationship between offset in electrical angle and BLDC motor performance

I am controlling a BLDC motor using Field Oriented Control (FOC). I use a 14-bit absolute encoder to read the rotor's position \$\theta_{m} \$, and use it to reconstruct the electrical angle \$\theta_{...
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50 views

Non equal phase currents at nominal speed vector control Permanent magnet synchronous motor

I working on my implementation of vector control for PMSM. I'm having close loops over speed, current in d axis(flux loop), current in q axis(torque loop). I'm using MATLAB/Simulink for vector control ...
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1answer
71 views

Estimate current consumption of a PMSM

I have here a 3 phase inverter and a PMSM, where I can measure the phase current of two phases and the input voltage of the DC supply. The PMSM is connected in star connection. I would like to ...
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1answer
266 views

Using Simulink to simulate FOC of a PMSM motor

I am building a simulation of Field Oriented Control of a PMSM in Simulink. The goal is to approximate the behaviour of a uController sampling the position of the rotor and the stator currents at ...
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1answer
356 views

ST's FOC for BLDC start up errors

I am using ST's FOC library 4.3. I am able to run my NovoMotec motor as I want, with the Observer + PLL configuration. Often (1 out of 5) during the start -up period, my motor stops, and I get a start-...
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1answer
100 views

Control of a Permanent Magnet Synchronous Machine (PMSM)

I'm trying to control the speed of a PMSM in the simulation software PSIM. Now, I have learned that in a Synchronous Machine the steady-state speed is directly proportional to the frequency of the ...
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1answer
947 views

How to determine a Permanent Magnet Synchronous Motor (PMSM) Nameplate?

I have already built a three-phase Permanent Magnet Synchronous Motor(PMSM) and wanted to use a VFD in sensorless vector control mode to run it. Now I want to figure out the characteristics of my ...
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1answer
2k views

Non-regenerative braking on a PMSM/BLDC motor

Problem I have been working on drives for a while, but one problem that I never seem to be able to really get around is the regeneration that occurs when our PID loop commands a lower speed/torque ...
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1answer
806 views

Confusion about the rated voltage of a Permanent magnet synchronous motor

Confusion about the rated voltage of a Permanent magnet synchronous motor. I’m currently trying to do a motor control experiment and I’m really confused by a term called “rated voltage” from the ...
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2answers
1k views

FOC for a BLDC motor with Hall sensors but no encoder

I am trying to implement a FOC algorithm in an MCU to use with a BLDC motor. My problem is that I only have the Hall sensor feedback, no precise encoder can be used. With this 4 pole pairs motor, ...
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1answer
364 views

Linearized state space model of PM synchronous motor

I intend to implement field oriented control of PM synchronous and Induction motor in Simulink. I started with the synchronous motor and was trying to find its linearized state space model. I read ...
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2answers
1k views

BLDC motor/PMSM parameters at reduced operating voltage

I was thinking about nameplate parameters of BLDC motors/PMSM and wondered what happens to those values if I operate the motor at a lower voltage as rated. Are my following conclusions correct? If ...
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1answer
6k views

Explanation of Lq, Ld and how it relates to motor inductance

I'm pretty much a novice to motor controls, but I was wondering if any of you could explain the concept of d-axis and q-axis inductance and how it relates to the inductance L that is usually specified ...
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148 views

What will motivate me to provide an isolation boundary in a motor controller?

This Analog Devices technical article describes a motor controller that uses their digital isolators to provide an isolation barrier between the 3 phase bridge/DC bus and the microcontroller. It is ...