The old imperial unit horsepower is equal to 746 watts (0.745 kW) or 33000 lb ft per minute (or 550 lb ft per second). The unit of electric power – 1 watt – is equal to the power produced by an electrical current of 1 amp at a potential difference of 1 volt.
How do you calculate the horsepower of an electric motor?
Using the formula (V * I * Eff)/746=HP, determine your electric motor’s horsepower. Multiply the voltage, the current, and the efficiency, then divide the result by 746. For example, the horsepower of a 230v motor pulling 4 amps and having 82% efficiency would equal 1 horsepower.
What is the rated power of a motor?
Most electric motors are designed to run at 50% to 100% of rated load. Maximum efficiency is usually near 75% of rated load. Thus, a 10-horsepower (hp) motor has an acceptable load range of 5 to 10 hp; peak efficiency is at 7.5 hp. A motor’s efficiency tends to decrease dramatically below about 50% load.
How much torque does a 1 hp electric motor have?
The 1800 RPM, 1HP motor produces 3 ft. lbs of torque at 1800 RPM. The 3600 RPM, 1HP motor produces 1.5 ft.
Do electric cars have more horsepower?
If you’re comparing an electric car and a gas car with the same horsepower rating, the electric car is able to use a lot more of its horsepower, too. That’s because EVs have fewer moving parts, so they’re able to run more efficiently.
How many amps is 1 horsepower?
Common Horsepower to Amps ConversionsHorsepowerAmpsEfficiency.5 HP3.45 A90%.75 HP5.18 A90%1 HP6.91 A90%1.25 HP8.63 A90%Ещё 11 строк
How many amps is 3 horsepower?
Here are the Full Load Amp (FLA) values for typical 230VAC and 480VAC 3 phase motors.Motor horsepowerFull load amps 230VACFull load amps 460VAC18.104.22.16863.0394.55157.5Ещё 17 строк16 мая 2020 г.
Is Electric HP the same as gas HP?
3 hp electric = 5 hp gas. That’s about right. The reason is, an electric motor develops shaft torque much faster than a combustion engine can. The engine must be over sized then (in comparison) to provide accelerating torque, even if it needs less once operating.
How do you tell if a motor is thermally protected?
For motors equipped with thermal protectors, the words “thermally protected” if the motor provides all the protection described in MG 1-12.52. (See MG 1-1.71 and MG 1-1.72.) For motors rated above 1 hp equipped with over-temperature devices or systems, the words OVER TEMP. PROT.
Why are motors rated in horsepower?
That’s why we are rated Motor in kW or HP (kilowatts/ Horsepower) instead of kVA. in more clear words, Motor only consume active power and provide mechanical power in HP or kW at motor shaft. … Moreover, the motor power factor does not depend on the load and it works on any P.F because of its design.
How do you reduce the rpm of an electric motor?
A couple of things you can do:
- Use gears to change ratio of speed, which is what you’re going to do. …
- Use a stepper motor, which are commonly used for high-torque, low RPM applications.
- Find some sort of PWM control circuit to slow it down, although you probably won’t be able to get it down to 5-10RPM.
Do electric motors have more torque?
That’s possible because at lower speeds, electric motors deliver more torque than gas engines. “Torque is what you need to get a car going,” says Grace, and with more of it, electrics out-accelerate comparable gas engines.
Why do Teslas accelerate so fast?
A car can only accelerate as fast as the tires can grip the road. … Tesla’s software measures how well each of the tires are gripping the road and adjusts torque in the front and rear independently hundreds of times per second to ensure the tires are constantly achieving maximum grip and propelling the car forward.
How fast is a Tesla?
The Tesla Model S comes standard with two electric motors and a 100-kilowatt-hours lithium-ion battery pack. All variants of the car have insanely quick acceleration. The Long Range Plus can accelerate from zero to 60 mph in 3.7 seconds. The Model S Performance can make the same sprint in 2.4 seconds.
What’s better hp or torque?
Torque, simply, is the ability of a vehicle to perform work — specifically, the twisting force applied by the crankshaft. Horsepower is how rapidly the vehicle can perform that work. … Because there is generally a limit on how fast you can spin an engine, having higher torque allows for greater horsepower at lower rpms.