Questions tagged [pmsm]
permanent magnet synchronous motor
110 questions
0
votes
0
answers
20
views
Calculate torque of PMSM motor in FOC control
I am trying to calculate the torque in Nm in my motor controller which uses FOC.
The motor is a 4 pole PMSM motor.
I tried using the formulas mentioned in this page:(https://www.mathworks.com/help/mcb/...
- 147
0
votes
0
answers
29
views
why are BLDC and PMSM eficiency and power curves different?
My understanding of BLDC and PMSM motors:
I understand: A permanent magnet synchronous motor(PMSM) is a type of brushless DC motor (BLDC).
They have different bEMF waveforms PMSM sinusoidal, and BLDC ...
- 143
0
votes
0
answers
42
views
DANA IPM motor not working
I have a DANA TM4 IPM 6kw motor and its not running.
The controller that I have is supplying 20A, 20A and 45A (approx) when put in reverse, forward and boost mode respectively.
The motor jitters (...
1
vote
0
answers
55
views
PMSM motor drive analog control loop
Specifications of pmsm servo motor:300W 200VAC
Encoder:2000 ppr
I am tasked with fabricating a servo drive for the above said motor,which is used to drive rotary table(1:50 gear reduction).Indexing ...
- 135
0
votes
0
answers
41
views
sensorless open loop estimation of rotor angle of pmsm
I am doing model based sensorless control of PMSM, to be more accurate I am doing an open-loop method of rotor angle estimation. So my project is to build a Simulink simulation in which I am ...
0
votes
1
answer
44
views
Will the efficiency of PMSM motor increase if it is rewound for high voltage keeping everything else the same?
The background is:
I have to redesign a 10.8 volt DC-battery supply, PMSM 3-phase motor to work with 24VDC. I can only rewind the current motor and adjust it to 24VDC.
The motor is rated for 550 watts ...
-1
votes
1
answer
46
views
How is motor electrical power typically measured in a VFD?
In a typical VFD which employs FOC control to drive a brushless DC motor, how is electrical power generally calculated?
I ask this question because the voltage at the motor terminals is generally a '...
- 147
1
vote
0
answers
60
views
Clarification of Motor Velocity Constant Kv and Back EMF constant Ke
In the wiki link,
Motor Velocity constant is given as:
Is 'Vpeak' the peak Phase to Phase voltage OR the peak Phase to Neutral voltage?
OR
In the same wiki link they give an example:
Here the unit ...
- 147
2
votes
1
answer
119
views
How to limit motor current during fast deceleration and regenerative load?
For a voltage source inverter which is used to drive a PMSM motor (using field oriented control), when we instruct the motor to reduce speed quickly (fast deceleration,) we notice that the DC bus ...
- 147
0
votes
0
answers
25
views
Why the PMSM FOC control current loop sampling appears negative value?
I ported the code of simple FOC 1.6, and then wrote the current sampling code myself. When I used the current open-loop control, I set Uq = 0.5, but the sampled <...
- 41
0
votes
1
answer
64
views
Rule of thumb for selecting Switching frequency of Brake/Regenerative switch
We are analyzing an old existing motor driver which controls a PMSM motor and looking to improve its performance.
The Mosfets used for the 3 phase H bridge operate at a switching frequency of 20 KHz.
...
- 147
2
votes
1
answer
69
views
Why does my PMSM motor stop unexpectedly?
I have two PMSM motors, motor1 with 8 pole pairs and motor2 with 17 pole pairs
I use a gyroscope to measure speed;
I use PID controller1 and PID controller2 set two velocity for motor1 and motor2;
I ...
- 41
0
votes
0
answers
21
views
Impact of Low Power Factor on Loss Generation in PMSMs
I am focusing on the losses generation in PMSMs and still have some doubts about the role of a low power factor.
For the analysis, I consider a three-phase PMSM controlled with Field Oriented Control (...
- 1
0
votes
0
answers
61
views
How to calculate the Motor Constant,(Kt) in (Nm/A) and back emf constant(Ke) of PMSM motor to calculate the applied torque
I have a PMSM motor with a verified back EMF of 12.7 Vrms per 1000 RPM.(Measured on an oscilloscope , Phase U w.r.t Phase V)
I know that this is Ke(12.7)
For a PMSM motor kt and ke are essentially the ...
- 147
0
votes
0
answers
32
views
Equivalent brushed DC motor for replacing a PMSM motor
I am trying to understand the relationship between voltage and speed on PMSM vs brushed DC motors.
Assuming efficiency is 100% in both motors and there are no losses, and keeping the same load for ...
- 67
0
votes
1
answer
227
views
PMSM - RMS phase current as a function of Id and Iq
Assuming to have a 3-phase PMSM driven with a balanced system of currents with sinusoidal shape, is there a way to write the RMS phase current as a function of Id and Iq?
I want to use the RMS phase ...
- 1
0
votes
0
answers
155
views
How to calculate motor flux in Webers from back emf of PMSM Motor and calculate torque in Nm
I have a PMSM motor , unfortunately not much is known about the motor and I am trying to determine some critical motor parameters, one of them is the motor flux in Webers and consequently I am also ...
- 147
1
vote
1
answer
124
views
What happens with a rotating PMSM motor when its inverter trips?
A PMSM motor is controlled by the inverter in the picture, which in turn is powered by a DC power supply that can not dissipate energy, only supply.
When the inverter trips, for example for over ...
- 497
4
votes
2
answers
192
views
Converting PMSM motor differential equation to difference equation/discrete-time implementation
I am researching about sensorless control of PMSM, and currently looking at how to implement the algorithm into code. From this link Module 9: Position Observer (Part 2/2). I encountered the equations ...
- 53
0
votes
0
answers
42
views
Is it necessary to calculate the flux for sensorless control of a PMSM?
For sensorless control of a PMSM, I require just the position estimation to replace the encoder. Further parameters such as speed can be calculated from position.
However, in many places I notice the ...
- 1
2
votes
2
answers
329
views
BLDC motor with built in controller and feedback [closed]
I intended to replace some DC motors (which have very unreliable encoders) with something better. I'm looking at BLDC motors with built in controllers. The ones I'm looking for are dimensionally ...
- 444
0
votes
0
answers
212
views
Conversion of Back EMF units from Vpeak/KRPM to V/Hz to find maximum achievable speed of a pmsm Motor
I am trying to understand the different units of back EMF used for a PMSM Motor.
I have a Motor specification that tells me that the Back EMF constant 'Ke' is 4.64 Vpeak/KRPM.
How do I go about ...
- 147
0
votes
0
answers
100
views
PMSM Motor Permanent Magnet Flux Linkage
I want to know the Permanent Magnet Flux Linkage of my PMSM motor. I need that to implement a Speed control for my motor. Without this value I cannot do the necessary calculations to make the motor ...
1
vote
0
answers
158
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 ...
- 147
1
vote
1
answer
74
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
54
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
2k
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 ...
- 147
0
votes
1
answer
541
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 ...
- 11
0
votes
0
answers
2k
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 ...
- 147
0
votes
1
answer
294
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 ...
- 147
1
vote
2
answers
1k
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 ...
- 147
0
votes
1
answer
300
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 ...
- 147
0
votes
1
answer
82
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
38
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%...
- 497
1
vote
1
answer
61
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 ...
- 497
0
votes
1
answer
85
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 ...
- 357
0
votes
1
answer
433
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
57
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
32
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
89
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
876
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
85
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
1k
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 ...
- 67
-2
votes
1
answer
121
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
176
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
195
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 ...
2
votes
3
answers
1k
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 ...
- 541
0
votes
1
answer
578
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 ...
- 79
0
votes
1
answer
59
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
390
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