Used technology
The electric machine is a Syncronous Reluctance assisted Permanent Magnet (SRPM) machine. This
technology has several bene ts compared to standard permanent magnet (PM) technology and
traditional induction machine (IM) technology. The SRPM technology combines the bene ts of PM
and Syncronous Reluctance technology, having increased torque capability over wide speed range
and ability to produce torque to higher speeds. The electric machine efficiency at lower speeds is
also good.
The supply current to the machine stator windings create rotating magnetic eld, which in turn
rotates the rotor containing permanent magnets. In the syncronous permanent magnet machine,
the rotation of the rotor (shaft) is syncronized with the frequency of the power supply current. The
reluctance technology maximizes the pull-out torque of the machine.
The permanent magnets of the rotor are of salient-pole design, having embedded permanent
magnets in the rotor structure. This structure makes the electric machine mechanically more
stable and capable of higher speed operations. See Figure below illustrating the magnet topology
of the electric machine. The Figure shows the principle only, and is not an exact illustration of the
structure.
Figure 1. Machine topology
1
Electric machine stator and stator windings
2
Electric machine rotor
3
Permanent magnets in the rotor
EM-PMI240
3. Product overview
12 |
©
Danfoss | Produced By: Danfoss Power Solutions | September 2020
| BC355256345493en-000103
Summary of Contents for EM-PMI240
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