- Characteristics of Energy-Efficient AC Motors The induction motor is the dominant type in use today, accounting for over 90 percent of installed horsepower-largely because it is rugged, simple, reliable, and cheap. Nearly all energy-efficient motors are induction motors, available in a wide variety of sizes and configurations. I found that your equation of P=V*I*1.732 was incomplete. You should consider both power factor and motor efficiency. As you know, you should able to find the motor power factor on the motor name plate, but most kinds of motors don't indicate the motor efficiency value. Thus, let's assume your motor efficiency value to be 88% & power factor of 0.8. In case you have been waiting for someone to state this more directly, I believe that the posts above confirm that you calculate input power using W = sqrt (3) X V X I X PF and Efficiency = output Power / input Power. We assume that the 1600 Watts marked on the nameplate is output power and efficiency = 91%. Characteristics of Energy-Efficient AC Motors The induction motor is the dominant type in use today, accounting for over 90 percent of installed horsepower-largely because it is rugged, simple, reliable, and cheap. Nearly all energy-efficient motors are induction motors, available in a wide variety of sizes and configurations. Nov 01, 2001 · Measuring efficiency. To calculate a motor's efficiency, you must measure its mechanical output power and divide it by the electrical input power. Measuring mechanical output power is fairly easy: You can use a torque meter to find the mechanical power based on the motor's speed and load. Measuring input power is not as straightforward. The main reason is believed to be the extremely low motor efficiency. (Experimental results led motor efficiency to be anticipated at 0.6.) Since the energy lost due to the low motor efficiency is used for heating the refrigerant gas, the “heat absorbed by the refrigerant” (denominator in η 1 and numerator in η 2) increases, and as a ... The main reason is believed to be the extremely low motor efficiency. (Experimental results led motor efficiency to be anticipated at 0.6.) Since the energy lost due to the low motor efficiency is used for heating the refrigerant gas, the “heat absorbed by the refrigerant” (denominator in η 1 and numerator in η 2) increases, and as a ... Electrical Motor Efficiency when Shaft Output is measured in Watt. If power output is measured in Watt (W) then efficiency can be expressed as. η m = P out / P in (1) where. η m = motor efficiency. P out = shaft power out (Watt, W) P in = electric power in to the motor (Watt, W) Electrical Motor Efficiency when Shaft Output is measured in Horsepower
- Characteristics of Energy-Efficient AC Motors The induction motor is the dominant type in use today, accounting for over 90 percent of installed horsepower-largely because it is rugged, simple, reliable, and cheap. Nearly all energy-efficient motors are induction motors, available in a wide variety of sizes and configurations. Free application For android basic all Electrical Formulas And Calculation electrical engineering Electronics Engineering formulas ac and DC power calculation Efficiency calculation energy efficiency formula single phase to three phase converter electrical formulas power formula ohm's law formula power equation current formula how to calculate power current equation horsepower formula ... Induction Motor Efficiency Example The motor of 5 HP operates at rated load with a line current of 6.8 A at a slip of 1.6 %. The core, rotational, and stray losses were measured and found as follows: P core = 80W P rot = 90W P stray = 110W P c o r e = 80 W P r o t = 90 W P s t r a y = 110 W A. Typical motor losses for a 4-pole 15 horsepower (hp) motor are analyzed in Table 6.3. End users are typically aware of the nominal motor efficiency that is listed on the pump nameplate and represented in this table; however, motor efficiency does change as speed and torque change and is also affected by voltage harmonics present in the VFD ... Mar 16, 2018 · Calculate three-phase motor power consumption by multiplying amps by volts by the square root of three (W = AV(sqrt 3). For example, if the motor is drawing 30 amps at 250 volts, you have 30 x 250 x sqrt 3 (about 1.73) = 12,975 watts). Convert watts to kilowatts by dividing the number of watts by 1,000. Sep 01, 2018 · Efficiency of any machine (including DC motors) is defined as “Percentage of output power / input power”. Formula for efficiency is: Efficiency = 100 * output power / input power Higher the efficiency, better the motor. 6.5. Efficiency of Inverters The efficiency of an inverter indicates how much DC power is converted to AC power. Some of the power can be lost as heat, and also some stand-by power is consumed for keeping the inverter in powered mode. The general efficiency formula is I found that your equation of P=V*I*1.732 was incomplete. You should consider both power factor and motor efficiency. As you know, you should able to find the motor power factor on the motor name plate, but most kinds of motors don't indicate the motor efficiency value. Thus, let's assume your motor efficiency value to be 88% & power factor of 0.8. Nov 01, 2001 · Measuring efficiency. To calculate a motor's efficiency, you must measure its mechanical output power and divide it by the electrical input power. Measuring mechanical output power is fairly easy: You can use a torque meter to find the mechanical power based on the motor's speed and load. Measuring input power is not as straightforward. Testing motors for efficiency. The most common standards used worldwide for measuring motor efficiency are IEEE 112 and IEC 60034. Both are based on sinusoidal power rather than inverter switched waveforms. There are also other testing standards such as JEC-37. However, the most universally utilized are the aforementioned IEEE and IEC standards.
- In case you have been waiting for someone to state this more directly, I believe that the posts above confirm that you calculate input power using W = sqrt (3) X V X I X PF and Efficiency = output Power / input Power. We assume that the 1600 Watts marked on the nameplate is output power and efficiency = 91%. Efficiency was better on higher speeds. As we have power and efficiency curves for the industrial motor from the generator kit and know its maximum efficiency (60% for tested motors) we may roughly estimate maximum efficiency for the kit motor to be about 4 times less than efficiency of tested generator motor, i.e. 15% at 1800-2200 RPM. The ratio between motor Output and Input is called efficiency which is indicated by the symbol of “η” and represented in the “%”. or This is the factor which tells about performance of the motor. It is the ratio between output and input power at shaft it can be written as efficiency (e) = output power / input power i.e. The ratio between motor Output and Input is called efficiency which is indicated by the symbol of “η” and represented in the “%”. or This is the factor which tells about performance of the motor. It is the ratio between output and input power at shaft it can be written as efficiency (e) = output power / input power i.e. Motor efficiency is a measure of the effectiveness with which electrical energy is converted to mechanical energy. Motor efficiency can be directly expressed as the ratio of power output to power input (see equation 6.1). The efficiency computed from this ratio is known as the direct efficiency. 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. Understanding motor insulation classes and temperature ratings is simpler than you might think. Though we're focusing on standard AC induction motors, you can apply most of this information to DC motors. Let's begin by looking at motor temperature terms. Ambient temperature is the temperature of the air surrounding the motor. Sep 01, 2018 · Efficiency of any machine (including DC motors) is defined as “Percentage of output power / input power”. Formula for efficiency is: Efficiency = 100 * output power / input power Higher the efficiency, better the 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. I found that your equation of P=V*I*1.732 was incomplete. You should consider both power factor and motor efficiency. As you know, you should able to find the motor power factor on the motor name plate, but most kinds of motors don't indicate the motor efficiency value. Thus, let's assume your motor efficiency value to be 88% & power factor of 0.8.
- The driving force of an electric motor is torque - not horsepower. The torque is the twisting force that makes the motor running and the torque is active from 0% to 100% operating speed. The power produced by the motor depends on the speed of the motor and is. zero at 0% speed, and; normally at it's top at operating speed The motor designer has to consider a number of parameters such as temperature rise, torque characteristics and efficiency, as well as power factor, and he can't optimize them all. It's costly to try to design both high power factor and high efficiency into a motor, and some of the design changes that improve power factor, such as a reduced air ... Understanding motor insulation classes and temperature ratings is simpler than you might think. Though we're focusing on standard AC induction motors, you can apply most of this information to DC motors. Let's begin by looking at motor temperature terms. Ambient temperature is the temperature of the air surrounding the motor. A worked example showing how to apply our efficiency equation to a motor. motor is not creating as much heat, the losses are reduced. This is the basic concept behind over-sizing a motor to achieve an increased efficiency rating (Fig. 7). Bear in mind that both of these situations (using cop-per for the rotor and over-sizing the motor) result in a few important changes to the operating characteristics. First and When taking efficiency measurements of power converters, it is important to be able to measure input and output at the same timing. The WT3000E offers up to our input elements capable of simultaneous measurement of single-phase input/three-phase output, or three-phase input/three-phase output. Nov 01, 2001 · Measuring efficiency. To calculate a motor's efficiency, you must measure its mechanical output power and divide it by the electrical input power. Measuring mechanical output power is fairly easy: You can use a torque meter to find the mechanical power based on the motor's speed and load. Measuring input power is not as straightforward. The efficiency of an induction motor changes with the relative load on the motor, compared to the motor rating, as shown in figure 2. Down to a motor load of about 50%, the efficiency of most motors remains relatively flat, even peaking around 75% load for some motors. The ratio between motor Output and Input is called efficiency which is indicated by the symbol of “η” and represented in the “%”. or This is the factor which tells about performance of the motor. It is the ratio between output and input power at shaft it can be written as efficiency (e) = output power / input power i.e.
- Nov 23, 2011 · Simple enough to determine using information found on the motor or manufacture’s literature and a bill from their electric company. The basic formula to calculate electric cost per hour is; Cost per Hour = Kw x $ per KwHr. Where; Kw Motor kilowatt rating. Find on motor label or in manufacturer literature. 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. Efficiency was better on higher speeds. As we have power and efficiency curves for the industrial motor from the generator kit and know its maximum efficiency (60% for tested motors) we may roughly estimate maximum efficiency for the kit motor to be about 4 times less than efficiency of tested generator motor, i.e. 15% at 1800-2200 RPM. Feb 03, 2018 · For three phase motor amps calculation the below formula is used. 3 phase motor current calculation formula is P/ (√3xVxPfxEff) or P/ (1.732xVxPfxEff) Both are same. So our motor power is 15KW with 15 x 1000 = 15000 Watts. Motor volts is 380 volts, Eff is 0.89 and PF is 0.85 according the above nameplate. The motor designer has to consider a number of parameters such as temperature rise, torque characteristics and efficiency, as well as power factor, and he can't optimize them all. It's costly to try to design both high power factor and high efficiency into a motor, and some of the design changes that improve power factor, such as a reduced air ...
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