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# Questions tagged [pmsm]

permanent magnet synchronous motor

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### 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 (...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### Why is there no torque in electric motors when the Iq current is zero and Id current is not zero?

Random vector position of stator current ( Id + Iq = Is ): Now I draw the stator current/flux vector as shown below where “Iq = 0” and “Id ≠ 0”: From lecture I’ve learned that the south pole of the ...
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### Choosing the right current sensor for the PMSM motor drive application

I have a 400W PMSM motor. It has a rated current of 2.4A with 3000RPM and 108V. The motor datasheet says that it can go upto 4500 RPM with load current of 4A. The motor is HG-KR43. Now I want to read ...
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### 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 ...
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### Conversion of Back EMF units from Vpeak/KRPM to V/Hz to find maximum speed of 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 ...
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### PMSM - Motor values for a simulation

I have a simulation of a PMSM using a ElectroCraft RPX22-042V24 Motor. For some testing purposes I need to increase the rpm by a lot. I am thinking about 30-40 000 rpm. Of course I searched for a ...
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### 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 ...
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112 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 ...
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1 answer
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### 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 ...
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### 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 ...
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1k 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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%...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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758 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 ...
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### 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 ...
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992 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 ...
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### 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?
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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 ...
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### 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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### 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 ...
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### 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 ...
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### 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 ...
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### 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)...
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### 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 ...