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User Guide
EM-PMI375
Product overview
Used technology
©
Danfoss | November 2021
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Causing any kind of impact forces to the electric machine (for example hitting or hammering or
dropping objects).
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Operating the electric machine with electric connections other than defined in the user guide and/or
other documents.
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Operating the electric machine with insufficiently tightened connections or cable glands.
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Operating the electric machine with power cables routed against the instructions.
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Operating the electric machine without properly dimensioned and operating cooling system.
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Operating the electric machine without following the bearing lubrication instructions.
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Touching the connection terminal of the electric machine or doing maintenance or adjustment
operations on the electric machine with the electricity connected.
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Accessing the connection box(es) if the shaft can be turned by an external prime mover.
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Lifting the electric machine from wrong lifting points and without correct lifting equipment.
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Lifting additional load with the machine.
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Storing the electric machine outdoors in wet or dusty conditions.
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Storing the electric machine without correct support to prevent rolling or falling of the machines.
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Using the electric machine in potentially explosive environment.
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Allowing dirt or liquid to enter into the electric machine or connection box.
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Using cables that cannot withstand the maximum currents of the electric machine.
The electric machine is a Synchronous Reluctance assisted Permanent Magnet (SRPM) machine. This
technology has several benefits compared to standard permanent magnet (PM) technology and
traditional induction machine (IM) technology. The SRPM technology combines the benefits of PM and
Synchronous 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 field, which in turn rotates
the rotor containing permanent magnets. In the synchronous permanent magnet machine, the rotation
of the rotor (shaft) is synchronized 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.
Machine topology
1
Electric machine stator and stator windings
2
Electric machine rotor
BC265856307805en-000202 | 19
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