Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [pmsm]

permanent magnet synchronous motor

88 questions
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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 specifically about the permanent magnet synchronous…
ItsAnApe
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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 value while the motor is spinning and I am looking…
slightlynybbled
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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 embedded controllers inside the servos or…
techSultan
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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 in motor data sheets. Also, is the phase to…
finimits
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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, Iq currents. The four supported motor types are…
anrieff
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Torque production in PMSM

First and foremost I have a question regarding the MMF distribution in a Motor produced by a single coil. I found a picture here: Why does the MMF not start at 0 at 0°? When I apply the $$NI=\int{H \mathrm{d}l}$$ with a curve with a small angle…
Steradiant
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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 these oscillations also occur when the high-side…
fst
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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 the BEMF of a BLDC motor looks more trapezoidal…
E. Mac
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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 machine, but they differ from each other in the value…
el_maxx
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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 Ampere's law \$\nabla \times H=J\$ with the…
8cold8hot
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Do BLDC motors have saliency similar to IPMSMs?

I am experimenting with an outrunner BLDC motor, which is a Gaui GUEC GM410. It is a 12N14P motor and it has sinusoidal bEMF. If my assumption is corrent, it can be considered to be a SMPMSM with no iron teeth between the permanent magnets, thus…
vjaz
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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(out of the 6) between the motor and driver. The…
shwetank vishnu
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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 practical tuning and fine tuning techniques, but…
raggot
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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 possible two methods for doing this and would…
AK47
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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 motor? The maximum speed of the bearings would…
K0ICHI
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