Evaluate the energy-saving effect of YE4 and YE5 motors through power consumption

For any motor consumer, the motor’s power usage is a critical factor while the motor product meets its purpose.

For electric motor products, rated voltage, rated power, efficiency, speed and current are all important performance indicators, while for power consumption, power and efficiency are important calculation bases for power consumption.

For electricity consumption, it is uniformly stipulated that electricity consumption is the unit of measurement for its energy consumption, that is, “degree” is used as the unit of measurement for electricity consumption. One degree of electricity is defined as one kilowatt-hour, which can be calculated according to the power and running time of the motor, but each motor corresponds to an efficiency level, that is, the electrical energy absorbed by the motor is not completely converted into mechanical energy, and there will be different degrees of loss. Therefore, the actual power consumption (M) of the motor should be the product of the rated power (P, unit: kilowatt) and the running time (h, unit: hour), and then divided by its corresponding efficiency (η), that is, calculated according to the formula M=Ph/η. For example, a 2P motor with a rated voltage of 380V and a rated power of 110kW has different power consumption corresponding to different efficiencies.

We use the efficiency values ​​corresponding to the Level 1, Level 2 and Level 3 energy efficiency levels specified in GB18613-2020 to calculate the power consumption of the 2P 110kW motor in the YE5, YE4 and YE3 series after continuous operation for one year.

YE5 motor power consumption: 110×24×365/0.968=995455 (kWh)

YE4 motor power consumption: 110×24×365/0.96=1003750 (kWh)

YE3 motor power consumption: 110×24×365/0.952=1012185 (kWh)

The table below compares the annual power consumption of motors with different energy efficiency levels and calculates the power savings of YE4 and YE5 series motors compared to YE3 series motors.

From the data in the table, we can see that the relative energy saving seems to be small, but the absolute power saving is a very considerable number, especially for large-sized motors, the absolute energy saving effect will be more obvious.

In order to encourage electricity users to adopt energy-saving equipment, different local governments have formulated electricity prices based on time periods or electricity quantities. Any energy-consuming enterprise can evaluate the necessity of adopting high-efficiency motors through necessary calculations.