Questions tagged [synchronous-motor]

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41 views

Tesla Model S inverter DC bus voltage

I was recently researching about this Telsa electric car inverters where i found one intresting thing. Usually in the voltage source inverter the DC bus voltage will be around 600 to 650 V considering ...
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1answer
25 views

How to find the 120 degree phase angle in a single layered lap winding of a synchronous machine?

Ok, so I have a 4 pole synchronous machine with 24 slots meaning each slot has a phase difference of 30 degree with respect to each other. 1)That means pole pitch is 180 degree for a full pitched ...
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42 views

PMSM failure modes? Winding apparently not shorted

(This may look like a repair question, but I'm actually interested in how the simplest kind of motor failed) This is the stator of a permanent-magnet single-phase motor from a washing machine drain ...
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21 views

Why does one synchronous motor lock to same phase angle and one locks randomly

I have two single phase 120 volt synchronous motors, one locks to the same phase angle on every start and one locks randomly. I watched several videos and they all skip this feature on explaining how ...
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1answer
44 views

Rotating rectifier waveform

I am testing a circuit which is used in a synchronous motor rotor excitation. I am testing the part when the rotor is stationary and the motor stator has a rotating magnetic field, in that case it ...
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2answers
50 views

Motors in symmetrical fault analysis

In three phase symmetrical fault motors(Induction and Synchronous) become generators(I guess because of the inertia). When do I take in consideration of the motors? Do I even need take them in ...
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1answer
131 views

What happens to the Real and Reactive power when I increase the excitation current in a 3-Phase Synchronous Generator?

Basically my doubt is, for the same load, why does the Real power remain constant when I increase the excitation current?
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0answers
169 views

What will happen if the prime mover driving synchronous machine is accidentally disconnected?

What happens to a synchronous machine connected to an infinite grid, acting as a generator, when its prime mover fails i.e. when mechanical input at the shaft reduces to 0? I'm assuming that the ...
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1answer
46 views

Understanding of torque constant and efficiency of a permanent magnet motor from datasheet

I am trying to understand the efficiency of the following permanent magnet synchronous motor Motor Datasheet (note we are using the medium voltage model), and its relationship with the input voltages ...
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1answer
58 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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1answer
240 views

Electrical equivalence and Difference between Flux and Torque in AC motors

For AC motors, Synchronous and Asynchronous ones, are these two linked together or different quantities, namely magnetic flux and torque? Also if I want to measure these quantities electrically then ...
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1answer
130 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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1answer
114 views

Adding an additional motor to a load

You have a 500kVA load with a power factor of 0.6 lag. You add an additional synchronous motor with an input of 80kW and max power factor of 0.8 leading. Determine the reactive power and the overall ...
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24 views

Medium Voltage Synchronous Motor Protection [duplicate]

How is the wound field of a medium voltage synchronous motor protected from voltage surges? We do know that the stator is protected from surges by either one of the following: 1. RC Snubber Circuit 2. ...
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1answer
75 views

Which way should this capacitor go on this circuit?

Which way should this capacitor go on this AC Hysteresis Synchronous motor circuit? Which terminal is CCW and which is CW?
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2answers
109 views

voltage transient protection for MV Motors

What types of transient voltage protection is applied on medium voltage motors and are these types of protection that are applied depended on the type of motor it is e.g Synchronous vs Induction motor?...
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0answers
144 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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0answers
57 views

Tips for designing a permanent magnet synchronous generator?

I'm currently working on designing a permanent magnet synchronous generator for one of my personal projects and I'm having trouble getting a voltage I am satisfied with. My goal is to get around 4-6 V ...
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1answer
147 views

Under no load condition,what will be the angle between the induced voltage and the supply voltage in synchronous motor?

Can anyone explain what will be the angle be the angle between induced voltage and supply voltage in synchronous voltage under no load condition?
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1answer
536 views

Synchronous motor high starting current

I have Danaher Motion SS451 (120V, 60 Hz, Single Phase, 72 RM, page 10 in manual below) synchronous motor that was consistently blowing a 3 amp fuse. I replaced it with 5 amp slow-blow fuse and ...
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0answers
224 views

Modeling scalar control of PMSM

I have met with a scalar control algorithm for a permanent magnet synchronous motor. I haven´t heard about it before so I decided to develop a dynamic model to further analyze this control algorithm. ...
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2answers
798 views

Permanent magnet synchronous motor (PMSM) equivalent circuit

I am trying to model a PMSM (permanent magnet synchronous motor) in LTspice and in order to do so I need to form an equivalent circuit. Through some research I believe the circuit should be formed in ...
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1answer
310 views

Synchronous Motor Leading Power Factor

I am looking for an explanation for the fact that over excited synchronous motor has leading power factor. If induced voltage due to the rotor is greater that the supply voltage, wouldn't that being a ...
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1answer
220 views

Does the rotation speed of a synchronous machine affect the voltages induced?

We know that synchronous generator are the go to for power generation. They essentially need an excitation current for the rotor and an external force to rotate it. This would induce a voltage in the ...
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1answer
48 views

Increase rotational velocity of synchronous motor

I recently got my hands on a Philips PM8110 (a single pen recorder which is basically an analog printer for voltages) which sadly provides paper with a velocity of 8 cm/hour. Although this would ...
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1answer
243 views

What are the d and q axes for induction machine?

What are the d and q axes for an induction machine (physical meaning)? I understand them for a synchronous machine but how are they defined for an IM?
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2answers
498 views

What is the connection of this synchronous motor?

so yeah I took this picture of the terminal box of the synchronous motor we're cleaning. I can't distinguish what is wye or delta when it's shown like this. what are the indications that a connection ...
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1answer
1k views

Formulas for AC Synchronous motors

I have this questions: At what frequency must a 4-pole motor be supplied so that its synchronous speed is 1200 rev/min? The nameplate of a standard 50 Hz induction motor quotes full load speed as ...
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3answers
873 views

Does the continuous power-to-weight ratio of electric motors decrease with size?

Background: According to the DEP overview section of this NASA paper, aviation companies are interested in distributed electric propulsion (DEP) because the scale-agnostic power-to-weight ratio of ...
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2answers
577 views

How does line impedance of a BLDC motor relate to the RPM of its rotor?

I am curious about the impedance of the three phase BLDC motor when it is in operation. If the speed of the rotor of a BLDC motor is proportional to the frequency of the three phase current, and the ...
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1answer
109 views

Why the shape of rotor-poles of salient pole synchronous machines are designed as sinusoidal in shape?

I knew that this is done to eliminate harmonics. But I couldn't get its reason. So I am confused whether my conclusion was right or wrong.
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377 views

Electrical Machine Design: Why do open slots are allowed in synchronous machine while they are avoided in Inductio Machine

Why do open slots are allowed in stator and rotor of synchronous machine while they are avoided in stator of Induction Machine? Because flux from stator to rotor (IM) and from rotor to stator (in SM ...
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0answers
594 views

When are positive-sequence and negative-sequence equivalent impedance the same?

One of the topics we covered in an introduction to power systems class was using zero/positive/negative sequence networks to analyze faults in networks. For many problems, this requires setting up ...
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2answers
9k views

What is the “field-weakening” operation?

I'm studying brushless and induction motors, in my studying material "field-weakening operation" and "field-weakening region" are often cited without an explanation. As far as I understood is a method ...
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1answer
94 views

Speed voltage variation in alternators

What happens to the terminal voltage of synchronous generator if we change the speed ?
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1answer
5k views

Calculate electromagnetic torque of synchronous motor?

I usually use this formula $$P=Tω=Τ\frac{2π}{60}n$$ where n is revolutions per minute and P is the power depending on the occasion. Since we have to deal with a synchronous motor we have to use ...
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1answer
132 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
135 views

Gas/Steam turbine for power generation

I have a question regarding the electricity generation using either steam or gas turbine. After the process of gas or steam accrues and the turbine rotates. the turbine which is connected to the ...
1
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2answers
388 views

Can over-excited synchronus motor operate on lagging power factor?

All of the Electric Machines literature I'm using states that over-excited (back emf E> supply voltage V) synchronus motor will operate on leading power factor (one of them states that it may also ...
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2answers
1k views

How does this increase the torque of a synchronous motor?

I'm studying from Wildi's textbook on electrical machines and I came across the following on starting a synchronous motor: "To limit the voltage induced in the rotor windings during the starting of ...
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0answers
40 views

Control AC Sync. Motor by Blocking AC Cycles

I have an AC synchronous centrifugal water pump that I would like to control the speed of. The main goal is to slowly start the pump and ramp up to full speed over about 60 seconds. I believe this ...
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2answers
728 views

d-q-frame-currents. What and where are they in PMSM?

I am doing a course in power electronics. We discuss a lot about Iq and Id, when we are talking about a three phase system and electric motors. I like to visualize things to make them more ...
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1answer
2k views

How is this synchronous AC gear motor being reversed?

I just disassembled the shifter assembly in a washing machine. It uses a synchronous 120VAC gear motor. The motor says "CW/CCW Z.P." It has two leads for the AC power and no other inputs. I ...
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3answers
1k views

Why does a synchronous motor run at synchronous speed if we reduce excitation to zero?

It is stated in the textbook I'm studying that if we reduce the excitation current after the rotor has reached synchronous speed , its speed will remain constant even if the excitation current becomes ...
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2answers
4k views

Why does stator current increase with increasing load in a synchronous motor?

Isn't the current, coming from the 3-phase source of the stator, constant? We don't change the source, so how does the current change? Is a voltage induced because of the magnetic field of the rotor? ...
2
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1answer
142 views

Which is the physical insight behind the widely approved 'space vector' notation used in the analysis of the dynamic model of electric machines?

When approaching the study of electric machines in transient condition, it is customary to discard the real physical vector quantities like magnetic field and magnetic induction and to define fake ...
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1answer
820 views

Armature and field mmf axes in synchronous machines

In the book "Electrical Machines and Technology" by J.Hindmarsh, in the chapter about synchronous machines, it stated that for the machine to develop a uniform torque, the armature and field mmf axes ...
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1answer
156 views

Modification of a 3 phase AC motor [closed]

There is a permanent-magnet synchronous motor with an external rotor that I want to explore and possibly modify. To do this I need some answers to my simple question: For a given shape of stator ...
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1answer
302 views

ACB vs Contactor for synchronous generators

I've been told by an experienced electrical engineering colleague that it is preferred to use an ACB rather than a contactor for making and breaking the connection to a synchronous generator, but he ...
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1answer
401 views

Reversing a small synchronous gearmotor

it's been difficult to find the answer to this problem I have. My project is based on home automation. I need to control the direction of the rotation and if possible the torque of an AC synchronous ...