# Questions tagged [induction-motor]

Induction motors are alternating current motors with rotors that are energized by induction. They are available with power ratings ranging from about 1/500 Hp (1.5 W) to 30,000 Hp (22MW). They are the dominant type of AC motor used in most of that power range. Squirrel-cage motors are, by far, the dominant type of induction motor.

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### Three phase motor with 3 sets of connections. Star, delta, and something else?

What's going on with this motor ? It's not simply wired into a star/delta starter. There's a 3rd option I'm not familiar with. The legend below and to the left shows Star/Star-Star/Delta.
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### What parameters give unlinear torque model of induction motor?

I want to realize factors which give nonlinear model of torque toward speed with power consumption in induction motor. I tried find math model induction motor. But usually, I had same charts: As we ...
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### When increasing the frequency of an induction motor can't I just add a capacitor to maintain torque instead of increasing the voltage?

When increasing the speed of an induction motor if one wants to maintain the same torque, the voltage has to be increased at the same proportion as the frequency of the AC supply. This is because the ...
1 vote
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### Why does inverter malfunctions when PCB is placed near metal enclosure?

I have designed a three phase inverter to drive a Synchronous motor. The motor operates fine when I place the PCB outside of the Aluminum enclosure of the motor. The voltage and frequency increases ...
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### magnetic field of stator when load increases in an induction motor

What happens to the magnetic field of the stator when the load increases in an induction motor? I understand that due to the higher torque demanded the speed of the rotor will decrease. So the slip ...
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### Spinning single phase induction motor while having no power

I have a single phase induction motor connecting to a spindle. The motor is connected to a electronic speed controller and I believe it has a series capacitor. If spindle are to be spin while motor ...
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### Do eddy currents in a rotor core of an induction motor create torque proportional to the coil current of a squirrel cage?

In a rotor of an induction motor, the core plates and wire coil conductors have non-zero thicknesses. Therefore, eddy currents non-zero too. And they approximately proportional to the coil current of ...
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### Why DC supply voltage is increasing when inverter is connected to powerful three phase induction motor?

If I connect my inverter to a resistive load or small inductive load the DC supply voltage (in my application it is 56 V) stays constant. However, if a powerful induction motor is connected, the DC ...
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### ESP32 crashes when starting a 3 phase induction motor through a star delta starter

Circuit Details: An esp32 driving 2 relays(5V SPDT HL JQC-3FC(T73)DC5V) via a darlington array(ULN2803A). The relays are connected to the start, stop buttons on a star-delta motor starter. The motor ...
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### How do I power this 400V motor from 230V? [closed]

I just bought a lathe with a motor that used to be connected to 3 phase 400V. I am trying to power it using single phase 230V domestic mains. I understand that I can use a VFD to provide the extra ...
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### Equivalent Circuit of Induction Motor

To find the equivalent circuit of the rotor side of an induction motor, the resistance and the reactance changes to ensure that the current in the rotor remains the same, whilst removing the slip term ...
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### How can I choose the right stabilizer for a 3-phase 415 V supply system?

I have a question about how to select the right capacity of voltage stabilizer for a 3-phase supply system. That system has the following type of load and capacity: Two 1 hp 3-phase motor, 440 VAC (...
1 vote
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### PSC motor auxiliary winding current at full speed

In articles, e.g. here, I often find this statement: In an auxiliary winding, a counter EMF is produced as the speed of the motor increases, and this EMF will limit the current that passes through ...
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### 0 V across motor capacitor terminals, but resistance is 20 Ω. Is the capacitor dead?

It is a 36 μF, 440 VAC, 50 Hz rated motor running capacitor, used in a single-phase motor. AC source is 240 V, 50 Hz. The motor has stopping working. I want to know whether it is due to a faulty ...
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### How to find out whether capacitor is the fault for failed single phase motor?

Single phased motor rated for 220V, 50Hz isn't working. I want to know whether is it just due to a failed capacitor or is the motor itself is damaged. The capacitor looks clean from the outside; no ...
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### Turn on control of antiparallel SCRs to pass AC

If you are trying to pass an AC signal through antiparallel SCRs (there to isolate the signal when required) where the AC frequency is low enough to satisfy the turn-off time requirements during the ...
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### Electrician Theory: Delta Star Induction motor question

This is the question I am trying to solve: A delta connected fully loaded induction motor draws 90A from a 400V supply when started direct online. Show by calculation the current at start up that the ...
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### What is the consideration when installing or replacing the shaft of an induction motor?

Here are two picture of my washing machine's motor. I am not sure whether you still have such that machine in your country. It is a top loading washing machine's washing motor (a another smaller one ...
1 vote
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### For vector control inner loop Iqs & Ids, how to match with the per-phase equivalent circuit currents of induction motor in real?

Although I can understand both of the diagrams above, I am confused about the relations between them. As marked in the per-phase equivalent circuit of a 3-phase induction motor above, we assume the 3-...
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### How to calculate the power of an induction motor as in the picture?

Here is motor of an washing machine. As shown in the picture, it is a 220VAC/50Hz, 135W, and 1.3A induction motor. There are voltage, power, and the current. What I understand about how to calculate ...
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### Can a 3 phase Induction (squirrel cage) motor generate electricity?

I am thoroughly confused again. I am at the point of relegating electricity as a black box, a mysterious phenomena I'll never comprehend. I just saw a YouTuber build an elaborate water mill for ...
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### If the chassis is at high potential and a human touches it, will he get shocked? The proposed circuit is for the cancellation of CM current

This circuit is compensating the potential difference between the chassis and motor so the bearing current or leakage current cannot flow from motor to chassis to ground. If the chassis is at a high ...
1 vote
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### Can I make an inductor rated 75mH 40A from an induction motor?

For my test bench, I am trying to implement an inductor that meets the requirements below. I have tried to purchase it outright as a made-up item, or the parts to make it (core and windings), but ...
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### What happens when a three phase motor designed for delta connection is run star-connected? [closed]

What happens when a three phase motor designed for delta connection is run star-connected?
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### Traction characteristic of the three phase induction motor

I have found a datasheet for a three phase induction motor intended for the traction applications. Among other information there was a below given traction characteristic . Unfortunately I am not able ...
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### I want to replace PID by linear quadratic regulator to control the speed of induction motor fed by Voltage Source Inverter under V/f scalar control

Can I just use the simplified scheme of constant v/f speed control (the open loop system) to design the linear quadratic regulator? I intend to use the Matlab command ...
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### Capacitor value for this motor [duplicate]

I have the motor in the picture. In the triangle connection, what is the cap-s value in order to get it running ok? Same, is there any formula / calculus for this situation (triphase motor running on ...
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### Water turbine generator

I have a 5.5 hp 3-phase induction motor, 440 V, 60 Hz, 1760 rpm attached to water turbine wheel that I would like to utilize as line source for home power generation. May I know the additional circuit ...
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### Why are induction motor cores laminated to prevent eddy currents?

The permeable iron alloy cores of induction motor rotors are formed from thin laminated sheets, designed to prevent eddy current flow and thus "reduce losses", but isn't the whole point of ...
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### 3 phase motor in Steinmetz connection on a single phase supply direction change problem

I want to run a 3 phase induction motor on a single phase power supply. I'm aware of the low operating power & low starting torque in this configuration. My load & duty cycles are also not big,...
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### Firing TRIAC / AC Light DIMMER module

I am currently testing the AC light dimmer with a blower fan output that has a specification of 220V 0.45A. When the trigger angle is set to 0, why does the output of the AC light dimmer allow a ...
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### Single phase induction Motor starting capacitor not disconnected

I have studied the single-phase induction motor and have a little confusion regarding it. I have seen many people using a switch with the phase shift starting capacitors so that after the start the ...
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### SVPWM board testing for design and development [closed]

I am trying to test the current feedback of my SVPWM board. For safety, I am thinking of connecting a light bulb instead of a PMSM motor. One incandescent light bulb across the U-V phase and nothing ...
1 vote
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### Does a permanent magnet AC motor use reactant power?

I'm learning about reactant power in school, I one thing I was told is reactant power is used to create the magnetic field and induction motor needs. Does this mean that a permanent magnet AC motor ...
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### How to calculate the power of a DC shunt generator?

How much power a DC shunt generator can generate if it was coupled with this induction motor: Induction motor: 3-phase / 400v / 50Hz / 600w / 1250RPM DC generator: Excitation voltage: 0-220VDC ...
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### How to calculate the values and ratings of wound Induction Motor Rotor Resistance Starter resistors?

How to calculate the values and ratings for the Rotor Resistance Starter resistors? Motor specs: 3 Phase 400V 1/2Hp 4 Pole 1750rpm Y connection
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### Is my relay logic practicable?

I am trying to apply relay logic to control my machine. The schematic is as shown. 'R' is a relay. Please note that my schematic symbols may not be the symbols used in industry. Wanted outcome: ...
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### Unknown motor with continuity across all windings. Help identify star vs. delta

I'm converting an old milling machine (Optimum F40E) machine to be driven with a VFD, and I have it working. The head is a geared head, and with correct settings (torque compensation) in the VFD I can ...
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### VFD parameter calculation for 3 phase motor

I have a small (¼ hp) motor that am going to hook up to a VFD. The VFD is programmable, and I'm planning to run the motor at 16-65 Hz with ∆ configuration. The question is: what is a good ball park ...
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1 vote
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### How is Power Distributed In This Case?

I have been reading the working of induction motor, where I came across Torque-slip characteristics where the equation of torque was determined to be (refer figure). In the derivation the power lost ...
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1 vote
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### Is this the correct setting of short coil pitch configuration?

So I tried to visualize 12 slots 2 poles induction motor and I used a coil pitch of 150 degrees as is the convention. Each pole will use an interval of 12/2=6 slots. 6 slots is a complete electrical ...
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### How can a failed furnace blower motor damage other equipment on a shared neutral? [closed]

Story time: Last week my furnace failed. The blower motor run capacitor went toast, so the motor wouldn't spin. The furnace is on a multi-wire branch circuit and shares its neutral with the basement. ...
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1 vote
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### How to understand the induction motor datasheet?

I have got the below given datasheet for a three phase induction motor and I have been attempting to understand its content. For me only the last column named continuous point A is clear - it ...
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### Architecture for a virtual 3-phase motor

I would like to construct an electronic virtual 3-phase motor for testing VSD/servo drive systems in the workshop, where the actual motor is not available for testing (e.g. because it is on a running ...
1 vote
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### How to use the equivalent circuit of an induction motor?

I have met a data sheet for a three phase induction motor intended for the traction applications. The data sheet contains below given table I have chosen the column operating point - continuous point ...
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### How does this single phase induction motor run without capacitor?

The motor of the picture has no facility to connect capacitor. The phase and neutral is directly connected to winding. It works fine on 220 volt 50 Hz AC. Although performance get poor at 190 volts. ...
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### How to compensate inverter nonlinearities in feedback manner?

I have implemented the direct field oriented control of the three phase induction motor. The control algorithm exploits a speed sensor and machine model based on the Luenberger state observer. The ...
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### How to measure table saw torque and horsepower?

I have a table saw that has the following rating: 120V at 60Hz standard 5/8" arbor I took the following measurements to see how they compared with the ...
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