The different types of adjustable speed industrial motors
Figure 6: Block diagram of a VFD drive power section (left) and the power section ready for installation in an AMR (right). (Image source: MEAN WELL)
While other VFD makers focus on sections 1 and 2 of IEC 61800- 9, Schneider Electric takes a more holistic approach and describes how to integrate its drives with the appropriate motor to meet the ecodesign directive and section 3 of IEC 61800-9 that delineates a quantitative ecodesign approach by means of eco balancing including product category regulations and related environmental declarations. The company’s Altivar Machine ATV320 drive family includes IP20 and IP6x rated VFDs from 0.18 to 15 kW (0.25 to 20 hp) for three-phase synchronous, asynchronous, PM and BLDC
motors in open loop control and includes functions like: ■ Low-speed torque and speed accuracy and high dynamic performance using flux vector control without a sensor ■ Support for high-frequency motors ■ Integrated functions for compliance with functional safety standards What about AMRs? AMRs use VFDs, but a different type of VFD. The VFD Series of industrial BLDC motor drives from MEAN WELL are a good example.
They comply with the relevant sections of IEC 61800, such as 61800-5-1 safety requirements and 61800-3 electromagnetic compatibility (EMC) requirements. However, these VFDs are not packaged drives, so the efficiency categories of 61800-9 don’t apply. The VFD Series includes eight models with DC and AC input versions ranging from 150 to 750 W. The model VFD-350P-48 operates with an input of 48 V DC for battery-power applications like AMRs and can supply up to 350 W and 20 A of output current.
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