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Torque (N-m) = 9.5488 x Power (W) / Speed (RPM)Most alternators need to spin at about 2,400 rpm at idle, have their maximum output above 6,000 rpm, and should never exceed 18,000 rpm.The required tractive torque of the motor shall be equal to the tractive torque at wheel, Tw = Ft. rw , (i.e. Tractive Torque = Tractive Force x mean wheel radius).
- Kf = Form factor = 1.11.
- Average value of EMF per conductor = ∴ (N= 120f/P)
- Form Factor = RMS Value / Average Value.
- VAV = 1.11 x 4fΦT = 4.44fΦT Volts.
- VPH = 4.44 KC KD f ΦTPH
- V = 4.44 Kf KC KD f ΦT Volts.
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How is alternator power calculated?
- Kf = Form factor = 1.11.
- Average value of EMF per conductor = ∴ (N= 120f/P)
- Form Factor = RMS Value / Average Value.
- VAV = 1.11 x 4fΦT = 4.44fΦT Volts.
- VPH = 4.44 KC KD f ΦTPH
- V = 4.44 Kf KC KD f ΦT Volts.
How much power is needed to rotate an alternator?
Most alternators need to spin at about 2,400 rpm at idle, have their maximum output above 6,000 rpm, and should never exceed 18,000 rpm.
TORQUE ON AN ALTERNATOR
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How do you calculate torque on a car?
The required tractive torque of the motor shall be equal to the tractive torque at wheel, Tw = Ft. rw , (i.e. Tractive Torque = Tractive Force x mean wheel radius).
How powerful is an alternator motor?
A car alternator can put out more than 1.0 HP if it’s changed over to a motor, depending on how it’s converted, and how it’s controlled. A conversion of an automotive alternator to a motor is less expensive than a conventional motor.
What is Z in alternator?
EMF Equation of Alternator
𝑁 = Rotor speed in RPM. 𝑓 = Frequency of the induced EMF in Hz. 𝑍 = Number of conductors in series per phase.
What is the maximum speed of a 50hz alternator?
Speed of alternator is given byrpmFor 50 Hz frequency the maximum speed is 3000 rpm for two pole p=2.
How much torque does an alternator need?
If your alternator demand is for example, 2kW, then you need 2.7 HP from the motor to drive it. The details of RPM and torque vs. power you’d have to get from the alternator supplier. Typical alternators were 50-70A at 12V, or about 720W (roughly 1HP.)
See some more details on the topic How is alternator torque calculated? here:
Torque calculation – IET Forums
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For “P/W” select the formula for speed in RPM. 2. A rough estimate of the output is multiplying the voltage by the amps output, since 1 watt = 1 …
How much torque does it take to spin an alternator?
torque for an alternator or any electromagnetic type devicde depends on the CURENT flowing through the coils, …
How much power can you get out of an alternator?
But nowadays, a single alternator can produce power up to 2500 Watt, depending on the power demand. The power that can be produced by an alternator is determined by the alternator rating. The output of the alternator ranges from 40 Amp up to 120 Amp. For high-amp alternator, it can generate up to 300 Amp.
What is good torque for a car?
Engines in mainstream cars and trucks typically generate 100 to 400 lb. -ft of torque. That torque is created by the pistons within an engine as they reciprocate up and down on the engine’s crankshaft, causing it to rotate (or twist), continuously.
What is more important torque or kW in a car?
Usually, the more kilowatts an engine produces, the faster a car will accelerate. Torque is best considered as the measurement of power at any given engine speed and the one that gets you moving, whereas power is the measurement of how fast torque is being used.
How many HP is an alternator motor?
How Much Hp Does Alternator Take? alternator takes about 1 HP for every 25 Amps of power. An alternator with 100 Amps will require about 4 HP at full output.
Counter Torque in Alternator | Electrical Machines 2
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Can a car alternator be used as a motor?
The humble automotive alternator hides an interesting secret. Known as the part that converts power from internal combustion into the electricity needed to run everything else, they can also themselves be used as an electric motor.
How many watts is an alternator converted to a motor?
Registered. You know that alternators can run as motors. It needs a big and complicated electronic unit. The rated power in generative mode is about 1400 Watts for a 14 Volts 100 Amperes altenator, for running in motor mode it needs 36 Volts power supply.
What is pitch factor in alternator?
The coil span-factor or pitch factor is defined as the ratio of the voltage generated in the short-pitch coil to the voltage generated in the full-pitch coil. The coil span factor is also known as chording factor.
How many volts AC does an alternator produce?
An alternator is so named because it produces alternating electrical current. This energy can be converted from one voltage to another using a transformer. Thus, the 12-volt AC output from an alternator can be transformed into 120 volt-AC current.
Which emf is induced in alternator?
The emf induced by the alternator or synchronous generator is three-phase alternating in nature. Let us derive the mathematical equation of emf induced in the alternator. Let, Z = number of conductors in series per phase.
What happens to frequency when speed of alternator increases?
As speed of an alternator is in direct proportion with the frequency. As speed increase frequency is also get increase.
Why short pitch coils are used in alternators?
a) Short pitched coils in the alternators are used to reduce the size of the machines.
What happens when an alternator is said to be over excited?
Detailed Solution. An overexcited alternator always supplies lagging current to the connected load, which means that load is of lagging nature. Lagging load take active and reactive power from the supply or alternator. Therefore, reactive power flows outwards from an over-excited alternator.
Why are alternators so inefficient?
Automotive alternators are inefficient because they’re using a 50 year old passive overload protection design. You can put unlimited load on a generator with the field current at maximum and as long as the Voltage does not fall below 12 Volts it won’t be damaged by overheating, at least not right away.
How does an Alternator Work ?
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Can you make a wind turbine out of a car alternator?
When one uses a Delco car alternator as a wind generator, it is absolutely necessary to modify the alternator to operate at low RPMs. This is accomplished with two intricate modifications: One replaces the stock Delco car alternator stator windings with a stator that has more turns of smaller gauge wire.
Is the alternator a generator?
No. An alternator is a device that converts mechanical energy into AC electrical energy. A generator is a mechanical device which converts mechanical energy to either AC or DC electrical energy. An alternator always induces an alternating current.
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