Ground source heat pump system of brushless dc motor efficiency problem | efficient brushless dc motor - The brushless dc motor in the south of anhui website | brushless dc motor

High efficiency brushless dc motor problem in ground source heat pump system used in all kinds of brushless dc motor, according to the brushless dc motor efficiency can be divided into two categories: standard efficiency of brushless dc motor and high efficiency brushless dc motor. High efficiency brushless dc motor compared with the standard efficiency of brushless dc motor, according to the different power, its efficiency can be higher than 2 to 10%, the efficient brushless dc motor is through better design and use can reduce the loss of special material to achieve, but the price is about more than the standard efficiency is 10% ~ 30% of the brushless dc motor, so sold all over the world is only 1/5 of the motor is high efficiency brushless dc motor. Brushless dc motor efficiency is the ratio of mechanical power output and power input power, usually expressed as a percentage, figure 1 shows the standard brushless dc motor and the difference between high efficiency brushless dc motor, by improving the design of the materials and technology to produce high efficiency brushless dc motor can produce more of the work in the unit power consumption. In general, high efficiency brushless dc motor usually has a high load factor, better insulation and pressure and low calorific value and small vibration, thus increasing the reliability. High efficiency brushless dc motor must have equal or exceed the international electrical manufacturers association ( NEMA) The ordinary stipulated in the brushless dc motor full load efficiency. In other words, a brushless dc motor efficiency must be equal to or more than NEMA efficient brushless dc motor full load efficiency of engineering value can be referred to as the efficient brushless dc motor. A high efficiency depends on the cost of brushless dc motor, brushless dc motor price, efficiency, using time, installation and maintenance cost and artificial cost, etc. High efficiency brushless dc motor, saves the operation cost of additional purchase expenses can be quickly recover the cost of additional costs usually efficient brushless dc motor can run through two years of savings to offset the cost. For example, suppose that 50 HP, load factor of 75% of the brushless dc motor run more than 4000 h a year, electricity is $0. 04 / kWh, an improved can save 4079 kWh or $163 a year. As a result, a high efficiency brushless dc motor, through a 4% efficiency improvement, two years than standard brushless dc motor to save $1304, basically met return standard for two years. Brushless dc motor speed and the problem of the relationship between the load centrifugal pump and fan load is extremely sensitive to changes in speed, speed increase 5 r/min alone will lead to the flow rate and significant increase of energy consumption, low efficiency. Replace a pump or fan, so must choose speed is equal to or less than full load is replaced of brushless dc motor speed. Of centrifugal motor driven fan on the power and speed of the direct. For example, if a brushless dc motor speed increased from 1740 r/min to 1760 r/min, although only increased 20 r/min, but to add 3. 5% of power consumption, air or water at the same time also with the square of the velocity change. Slip and the speed depends on the load, it can make the different brushless dc motor driven to be the same load, such as the 100 HP output 25% rated power brushless dc motor, can use a 50 HP or lower horsepower BLDC motor instead of, only 50% of the power of 50 HP at this time, or 40 HP 62. 5%, 83% of the 30 HP brushless dc motor, 25 HP full output. As brushless dc motor load gradually increase speed decreases, full speed to full speed, therefore, the brushless dc motor in the south of anhui, only low speed or large load of brushless direct current (dc) function to run close to the synchronous speed way, loaded with efficient brushless dc motor with low power at nearly the speed of the synchronous speed work, instead of the original large power but lower speed brushless dc motor, can obviously save operating cost. In this paper, from the 'social channels'