Questions tagged [pmsm]
permanent magnet synchronous motor
89
questions
1
vote
0
answers
30
views
How is soft switching in a PMSM inverter achieved?
Recently I found some papers about PMSM drives that use the regular circuit of 6 e.g. IGBTs to drive a permanent magnet synchronous motor but with a resonant circuit in front of it to achieve zero ...
- 75
1
vote
0
answers
18
views
Does "Torque control" using FOC consider input (battery) voltage drop?
All information related to Torque Control using FOC technique consider a current control, so they suppose a correlation between req_Id (Id desired) and requested mechanical torque. PI regulators ...
2
votes
0
answers
29
views
Accuracy of PTZ with Permanent Magnet Synchronous Motor (PMSM) [closed]
For my project I need a pan-tilt system able to provide 0.1° resolution or better.
I do have my own solution based on stepper motors with planetary gear for low backlash and 0.05°.
However, I designed ...
- 131
0
votes
1
answer
27
views
Calculate motor flux of a PMSM
I am struggling with the calculation of the motor flux for a RPX22-042V24 PMSM. I know back EMF, Torque constant and several other values from the datasheet. But I found different ways to calculate ...
- 75
0
votes
0
answers
56
views
Correct understanding of torque constant for BLDC using FOC
I have a BLDC motor with sinusoidal windings that I drive with FOC technique. With my recent knowledge earned by implementating FOC, I got confused with the typical motor constant given in ...
0
votes
0
answers
46
views
How do we calculate the power of a PMSM Motor and inverter
I have a motor controller running FOC control to control a PMSM motor.
I was wondering how do we calculate the power consumed by the motor (just the motor).
I have a DC-DC converter which outputs 300 ...
- 75
0
votes
1
answer
60
views
How do we calculate the rise in DC bus voltage during negative torque conditions on a PMSM Motor
I have two PMSM motors connected back to back with a coupled shaft.
Both the motors have independent motor drive inverters driving them.
One motor (Motor A) is operating in speed mode, meaning its job ...
- 75
1
vote
2
answers
100
views
How to find the number of poles of a PMSM motor?
I have a permanent magnet synchronous motor, without a datasheet for it.
Could you kindly advise how do I find the number of poles without actually opening the motor up?
After some searching, I found ...
- 75
0
votes
1
answer
30
views
Quick PMSM FOC PI controler design
For a Simulink Model I am looking for a quick and easy way to estimate PI-controller parameters for a speed control loop and Id and Iq controler of a PMSM using FOC.
I don't have a real motor just the ...
- 75
0
votes
0
answers
23
views
how to implement external sinusoidal commutation using encoder feedback in BLAC motor?
I have a linear permanent magnet synchronous motor with sinusoidal back-EMF and a sinusoidal driver with current operation which takes two reference sine waves with a 120-degree phase difference, ...
0
votes
0
answers
18
views
PWM in ANSYS Twinbuilder software
Where can I learn PWM Control stratergies for MOSFET using algorithms in an inverter, in ANSYS Twinbuilder software? I also want to get familiarised with ANSYS interface.
- 1
0
votes
1
answer
50
views
Unexplained current perturbation with 3 PWM PMSM control
I encountered some problem of current measurement using the DRV8323RH to drive a PMSM motor in 3xPWM mode.
I am running a test under the following conditions:
1 DRV8323RH gate driver configured in 3 ...
0
votes
0
answers
25
views
How much lower than the ideal torqe curve is the actual torque of a PMSM running at overspeed?
VFD-controlled PMSM's are said to produce constant maximum torque up to the rated speed. Above the rated speed the VFD performs defluxing and produces constant power. This should then mean that at 200%...
- 420
1
vote
1
answer
44
views
What must be considered when selecting a VFD-controlled PMSM that will be freewheeling beyond its nominal speed?
With a given two-pole motor, with all else being equal, if the pole count is increased to 6, the nominal speed will be reduced to 1/3. Can it be freewheeled to the same speed as the original 2-pole ...
- 420
0
votes
1
answer
45
views
Impact of reverse conduction on control strategy of PMSM motor
On a three-phase inverter working as a Master Control Unit (MCU) to control a permanent magnet synchronous motor, if we replace the IGBTs with SiC MOSFETs, what could be the possible impact of this ...
- 295
0
votes
1
answer
114
views
Speed control in FOC system
I kinda understood how field-oriented control works but I have a question in my mind. How am I gonna control the speed of the motor? With which variable am I gonna be able to do that? For example, in ...
- 143
0
votes
0
answers
50
views
How to decrease the time required by a PMSM (outer rotor) motor to reach rated speed?
I have a Outer rotor PMSM with FOC control and rated speed of 3000 rpm. It takes about t=0.5 seconds to reach 3000 rpm without load.
Goal:
Decrease the Time "t", so that the motor can reach ...
2
votes
0
answers
30
views
Post-processing for determining rotor angle of Park transformation
I have done experiments with a Sinusoidal Axial Flux Permanent Magnet Machine with electrical load, i.e. with the machine as generator. These experiments were done at a constant velocity of the ...
- 21
0
votes
0
answers
76
views
Choosing a motor
Long time listener, first time caller etc! Also, if you think this could be better answered somewhere else please let me know.
I'm building a pottery wheel at the moment and I'm in a bit of a quandary ...
0
votes
2
answers
480
views
Inverter DC link voltage rises when motor decelerates
For a voltage-source-inverter (VSI) powered PMSM, as shown in the picture below, the DC bus voltage across the DC bus capacitor Udc normally drops frequently, which will cause no harm to the cap ...
- 383
1
vote
0
answers
56
views
Selecting a Gate driver for IGBT
I have trouble choosing an IGBT gate driver for PMSM motor control application. Can someone help me with the procedure? I went through few papers and I'm stuck with finding the external and internal ...
- 11
0
votes
3
answers
650
views
Regenerated current during deceleration of PMSM motors
Let's say that a VFD is powering a PMSM and the motor is rotating at rated speed. The motor is connected to a high inertial load, so it cannot decelerate quickly. Now if the VFD commands a quick ...
- 57
-2
votes
1
answer
82
views
Difference between turns function and winding function PMSM?
What is the difference between turns function and winding function as applied in the Modified Winding Theory and how do I compute them given the parameters of a PMSM?
- 7
0
votes
2
answers
88
views
Motor controller structure for constant torque starting and then switching to constant speed
I need to design a field-oriented-control (FOC) controller for a permanent magnet synchronous motor (PMSM) with position sensor. In the starting process where the motor goes from zero speed to rated ...
- 383
0
votes
0
answers
144
views
Transient generator simulation torque fluctuation (Ansys Maxwell)
while simulation for a PM axial flux generator at no load 1000RPM in Ansys Maxwell, shows moving torque fluctuating between -0.7 to 0.7 Nm, which should have been 0, as there is no load attached and ...
1
vote
1
answer
835
views
BLDC alignment of hall sensors and encoder
I am trying to build a BLDC motor controller using field oriented control.
The motor I am going to use is equipped with hall sensors as well as with an incremental encoder that has 512 steps.
I have ...
- 531
0
votes
1
answer
334
views
Maximum torque condition of pmsm motor
In FOC, maximum torque is achieved by keeping rotor and stator flux at 90 degree electrical angle. Why does electrical 90 degree separation produce maximum torque? [edit: removed the linked video]
It ...
- 131
0
votes
1
answer
51
views
240v 1ph Servo Drive with output to 3ph 380v?
Do these exist? Iv only seen ones where i/o is either 240v or 380v. So can a 240v in & out servo drive work to any extent if its driving a 3ph 380v PMSM motor, if so what and Im interested in the ...
- 13
1
vote
1
answer
256
views
How to get EMF flux in the torque equation of a motor?
I have a question on field oriented control of electric motor drive.
I have been looking at derivation from 3phase to 2phase dq electrical matrix formula, but most of them stop at the torque equation ...
- 21
0
votes
1
answer
72
views
Can FEMM be used to calculate real power of a PMSM at 50Hz frequency?
I am working with FEMM, for past few months and i have this doubt that can real power of a PMSM be calculated using FEMM at 50Hz frequency?..
Because at frequency higher than 0Hz the flux produced by ...
0
votes
0
answers
57
views
Why don't I get a bell curve in the torque vs rotor position plot?
I have designed a inset PMSM. I tried to plot the torque vs. rotor position plot but I am not getting a bell curve. Like at the torque must be maximum only when theta is 90 degrees.
I don't know where ...
0
votes
0
answers
255
views
How to calculate the maximum Torque for a PMSM Motor?
I have a cheap BLDC/PMSM Motor from Ebay. I don't have any further Information, only a sticker: "A2212/10T 1400KV".
I connected my oscilloscope to 2 phases of the motor and I have seen that ...
- 1
0
votes
0
answers
71
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 ...
0
votes
1
answer
145
views
What is derivative of FFT outputs with respect to time?
I am quite new Digital Signal Processing.I am trying to implement anti-cogging algortihm for my permanent magnet synchronous motor (=PMSM) control algortihm. I follow this documentation
I collected ...
0
votes
0
answers
87
views
Is the orthogonal spacing of dq axis of AC motor with respect to electrical or mechanical angle?
In FOC of AC machines, we try to align the stator flux to Q axis and maximize the value. The idea behind this logic is when rotor flux and stator flux are orthogonal, we generate max flux. But is the ...
- 131
0
votes
2
answers
214
views
picture of dq axis in multi pole motor
How does the dq axis of multi pole motor look like? Typically online images search show dq axis for motor with one pole. Consider a 4 pole stator PMSM motor. Will there be multiple dq axis for each ...
- 131
0
votes
1
answer
87
views
Effects of power fluctuations on batteries?
When we use an AC motor for the battery, if the motor load fluctuates and the power fluctuation occurs, what will this affect on the battery? As a simple example, if the power changes by 10 + 2 sin (t)...
- 13
0
votes
0
answers
114
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 ...
- 1
0
votes
3
answers
1k
views
Why are Halbach Arrays useful in PM motors?
I understand how Halbach arrays strengthen the magnetic field on one side of the array. I also know that, in a permanent magnet (PM) motor, there is already a limit on the air gap flux you can design ...
1
vote
0
answers
50
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 ...
0
votes
4
answers
366
views
Testing motor using an identical motor in regen mode
I want to be able to test a motor (permanent magnet motor + gearbox) continuously in steady state mode at different operating points (torque, RPM,) to measure the efficiency of the motor.
Instead of a ...
2
votes
0
answers
60
views
How to apply Ampere's law with the integration path crossing a permanent magnet?
I read several books on permanent magnet synchronous machines (PMSM), and they tend to describe the relationship between H and B as \$B_{mag}=\mu_0\mu_{r,mag}H_{mag}+B_{rem}\$.
Then when they apply ...
- 175
0
votes
1
answer
2k
views
Can I wire multiple brushless motors in series or parallel?
EDIT: As Bruce Abbott pointed out in his answer, it's not possible to connect 3-wire brushless motors in series, since you don't have access to both ends of each winding. Oops. So, the more relevant ...
0
votes
2
answers
57
views
ICE-electric transmission drivetrain parameters
Pardon me if this question covers too many elements; also, originally I posted this in Engineering stack-exchange but it may be more relevant here.
Basically I do not fully comprehend what would be ...
- 55
0
votes
1
answer
135
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 ...
- 11
0
votes
0
answers
55
views
Field weakening effect on stator voltage
In case of field weakening of PMSM, we weaken the rotor flux along d-axis to increase speed. I sort of understand the fact that the motor consumes id and hence iq reduces since there is a current ...
- 131
0
votes
1
answer
70
views
PMSM current control test
First tests for the field oriented control (FOC) of a pmsm may be conducted only on an inductance or a stator, i.e. not at the rotating machine, e.g. when the machine has more or less high power I ...
- 172
3
votes
1
answer
1k
views
Differences between the drive algorithms for BLDC, PMSM and IPMSM
In the manual for a Scott Drive motor controller, they have a parameter you can set, called Motor Type. Its description reads
The motor type determines the method used to calculate the reference Id, ...
- 5,331
1
vote
3
answers
283
views
Rotor Zero Degree
I have a 3 phase ac servo motor. I wrote a foc algorithm suitable for this motor (I think!), but I need to determine the zero rotation angle to get the starting commutation of the rotor. I asked this ...
- 81
0
votes
1
answer
302
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 ?
- 11