IE Explanation

Classification of low-voltage electrical motors according to IEC

Three-phase motors (from 0.12 kW to 1000 kW and 2, 4, 6 or 8 poles) are classified into efficiency classes (IE1 - Standard Efficiency, IE2 - High Efficiency, IE3 - Premium Efficiency and IE4 - Super Premium Efficiency) according to IEC 60034-30-1. This classification applies to motors with an output shaft and the option of measuring this motor (i.e. for all motors that can be used individually).
According to this IEC standard, such motors may currently only be sold with at least efficiency class IE3, or in the case of motors with an integrated inverter, those that correspond to at least efficiency class IE2.

Exception
According to Commission Regulation (EU) 2019/1781 of 1 October 2019, these requirements do not apply to our side channel blowers of the SKV-NS, SKV-ND, SKV-NDF, SKV-NTF, SKV-HS, SKV-HD and SKV-HT series.
Article 2, 2a) states:

Motors that are fully integrated into a product (e.g. gearbox, pump, fan or compressor) and whose energy efficiency cannot be tested independently of the product, even when using a temporary bearing plate and drive bearing; the motor must have common components with the driven device (e.g. a shaft or housing) (besides connecting parts such as screws) and must not be designed in such a way that it can be completely separated from the driven device and operated independently. In the event of separation, the motor must no longer be operational;

For side channel blowers, for example, the designation IE2 means that the drive motor was designed according to IE2 and would meet the standard as a standard motor.

Advantages of more energy-efficient motors (e.g. IE2 compared to IE1)

IE2 motors are larger with the same output power (more safety)
the thermal load of the IE2 motors is lower and thus the service life is longer
Downtime and maintenance costs are reduced
the tolerance to overload, voltage peaks is higher
electricity costs decrease (lower power consumption = lower consumption)
our side channel blowers with IE2 motors are also UL-certified

Example calculation for energy cost savings (IE2 to IE1)
Power = Current * Voltage
If the current is reduced by 0.1 A, the following values result:
P = 0.1 A * 400 V ~ 40 W
In one day: ~ 960 Wh
The saving per year is: ~ 350 kWh (for every 0.1 A of reduced current consumption)
Example:
SKV-NS-210-3-936 - max current: 5.6 A
SKV-NS-210-3-836 - max current: 4.65 A
Reduction 0.95 A and therefore ~ 3325 kWh/a
Cost analysis (prices from 2023): Savings at 26.5 ct/kWh = ~880 €/a - additional costs IE2 motor = 86 €

The IE3 models are not directly comparable (with IE1 & IE2 models) as they have significantly more power and create higher pressures/vacuum.
The IE4 models for our side channel compressors are currently under development.

rotary vane vacuum pumps

Apart from our smallest rotary vane vacuum pump with 20 m³/h, our rotary vane vacuum pumps have fully-fledged flanged motors, which do not fall under the exception.
Therefore, these pumps are currently offered with at least IE3 motors.