That is why we are pleased to announce that OJ Electronics DV drives can now power the PMsynRM motors you wish to include in your systems. The support is provided for all standard DV Gen II drives via a software update. Our drives have been tested with a range of PMsynRM motors and offer all the performance and efficiency you expect from your OJ drives.

Why PMsynRM?
PMsynRM motors are interesting for HVAC system suppliers primarily due to their relatively low cost. Part of what makes this technology more affordable is that it requires fewer magnets. Then, the magnets that are used are made from widely available metals, not rare-earth materials – so less risk of wide price fluctuations or supply interruptions. Finally, PMsynRM motors tend to last longer than the alternatives.
“At OJ Electronics, we want our drives to support any motor, and we work hard to keep pace with technological advances as they hit the market. In addition to PMsynRM motors, our Gen II DV drives can power induction/asynchronous (AC) and permanent magnet (PM) motor designs. Chances are, an OJ DV drive will power any fan motor you choose to work with.”
Preben D. Jessen, Head of Drive Products, OJ Electronics
Deep Dive – PMsynRM Technology
A PMsynRM motor is a synchronous reluctance motor that is assisted by permanent magnets in the rotor – which is why they are sometimes referred to as “permanent magnet-assisted synchronous reluctance machine” (PMASynRM) motors. They are distinguished by the large share of reluctance torque they produce, compared to PM electrical torque.
PMsynRM Motors Offer a Number of Benefits for HVAC System Manufacturers, including:
- Lower cost, no rare-earth magnets
- Greater supply-chain security, no rare-earth materials
- Lower heat generation
- High efficiency at typical ventilation speeds
- More complex but manageable with modern VFDs
- More robust, less magnet degradation
- Lighter, higher responsive to speed changes
- Lower maintenance, fewer magnets to degrade
- Quiet operation
Although these drives are more complex to control, precise, efficient control can be achieved by modern variable-frequency drives like the OJ DV series.