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Questions tagged [pmsm]

permanent magnet synchronous motor

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37 views

Confusion with winding voltages for a fixed positioned brushless motor

Below is examples of various commutation forms different driving ways of a brushless motor: Such a motor can be BLDC or PMSM. My question is: imagine we set the motor position to a fixed stationary ...
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18 views

PMSM V/F control

In BLDC motor 6 step control we know that for a particular hall sensor state (say 110) only 2 windings are excited (say Y & B). So, as long as Hall sensor state is 110, Y & B windings will be ...
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1answer
68 views

BLDC motor drive: Requires an external push to start rotating

I am trying to drive a 23-pole pair(i.e. 46 poles) BLDC motor using an LV8139 pre-drive, the output of which is fed to drive the 3 half bridge MOSFETs. I managed to connect the correct phase sequence(...
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28 views

PMSM efficiency map and Dyno testing

I would like to do a dyno testing on a ~40kW PMSM motor. The basic idea behind the dyno test is to create an efficiency map for the motor and measure the machine's characteristics as well estimate the ...
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1answer
52 views

PMSM Rotor Design. Are these terms equivalent?

I'm working on a project with a PMSM. As I go through the literature I come across the following terms and wanted to make sure that I am getting right which ones are synonyms. Surface-mounted PM = ...
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35 views

PMSM torque behavior and interpretation

As I know, with field oriented control of a PMSM it is possible to control a constant torque via the dq-axis currents. I try to understand the behavior of a permanent Magnet synchronous machine when ...
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2answers
114 views

Where do the oscillations in a GaN half-bridge design exactly come from?

I'm working on a inverter pcb for a PMSM with GaN switches and I'm wondering: where exactly do the oscillations come from, when the high-side GaN goes high and the low-side GaN goes low. Why don't ...
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1answer
34 views

Harmonics modelling in electrical machines

I am currently working with a permanent magnet synchronous machine and I am trying to model the harmonics caused by magnetic saturation, dead time, and non linearities of the frequency inverter. It ...
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3answers
361 views

Can AC synchronous motors be controlled with VESC?

I want to drive something like these ac synchronous motors: Small Mige: https://www.alibaba.com/product-detail/Small-Mige-130-series-1KW-best_60394196285.html?spm=a2700.7724838.2017115.13....
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44 views

What is the influence of the DC voltage of an inverter on the control of a PMSM?

I am developing a FOC controller for a PMSM (in blue). The outer loop (speed control, in orange) is made with a PI. The inner loop (current control, in green) as well. Now I'm including the ...
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70 views

Controlling the reactive current of an PMSM in an open loop setting

for my master thesis I'm investigating the EMI of a 3-phase inverter, wich drives a PMSM. The inverter's structure is the common 3-Phase DC/AC Voltage Source Inverter and it uses EPC2020 GaN ...
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53 views

Problem in estimating the rotor position of the Permanent Magnet Synchronous Motor based on the stator back emf flux method

The formula used to compute the rotor position of a Permanent Magnet Synchronous Machine from the stator voltages and currents in alpha, beta reference frame is attached as an image. In the ...
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1answer
133 views

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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126 views

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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2answers
55 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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1answer
756 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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2answers
259 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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1answer
635 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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220 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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3answers
3k 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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1answer
400 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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71 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
116 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
370 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
523 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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123 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
1k 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
3k 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
1k 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
401 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
8k 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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2answers
160 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 ...