CDM efficiency classes CDM international efficiency (IE) classes are defined from IE0 to IE2. They are determined by comparing the total loss of the CDM with the performance of a reference CDM (RCDM). IE classes for CDMs are defined relative to the 90, 100 operating point using 90% motor stator frequency and 100% torque current to avoid overmodulation and ensure comparability of the performance measurements of drives from different makers. The performance of the RCDM is defined as IE1. A CDM with greater than 25% lower losses than the RCDM is classified as IE2, and a CDM with greater than 25% higher losses than the RCDM is classified as IE0. The RCDM also enables the comparison of the energy consumption with an average technology CDM at eight pre-defined operating points (0, 25), (0, 50), (0, 100), (50, 25), (50, 50), (50, 100), (90, 50) and (90, 100) (Figure 2). PDS efficiency classes PDS international efficiency system (IES) classes are like the CDM IE classes and are defined as IES0 to IES2. They are based on a reference PDS (RPDS) and reflect the efficiency of the complete drive module plus the motor.
Figure 2: IEC 61800-9 CDM operating points and efficiency classes. (Image source: Siemens)
Matching the combined motor and CDM to the specific application requirements provides greater potential for overall efficiency optimization. That efficiency optimization is reflected in a higher IES classification. Like the RCDM, the RPDS enables the comparison
of energy consumption with an average technology PDS at eight pre-defined operating points. The operating points are based on a percentage of torque and a percentage of speed, and the IES value is calculated based on 100% torque and 100% speed, which is the (100, 100) operating point.
we get technical
31
Powered by FlippingBook