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Questions tagged [synchronous-motor]

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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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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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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
14 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
47 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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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
65 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
36 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
58 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
42 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
50 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
193 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
539 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
553 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
328 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
83 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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279 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
435 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
7k 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
74 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
4k 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
94 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
104 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 ...
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2answers
282 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
845 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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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
96 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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2answers
925 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
2k 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? ...
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1answer
124 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
666 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
139 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
234 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
171 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 ...
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1answer
732 views

Speed of Synchronous motor determined by frequency, but how about current?

The speed of a permanent magnet synchronous motor is determined by n = 120f/p where f is frequency, n is speed in rpm and p is number of poles. p is fixed in a motor so changing the frequency ...