PM reluctance hybrid motors
A PM reluctance hybrid motor is a combination of a reluctance and a permanent magnet motor. Unlike a classic reluctance motor, a PM reluctance hybrid motor thus has magnets in the rotor.
Product data PM reluctance hybrid motors VECTOMOTOR VM600m
Structure and function of PM reluctance hybrid motors
A PM reluctance hybrid motor is a synchronous motor – in other words, the magnetic fields of the rotor and the stator rotate along with each other at the same speed. The difference from the PM motor is the attachment of the magnets. In a PM reluctance hybrid motor, the magnets are not installed as surface magnets, as with a classic syn-chronous motor, but are buried in the rotor. As a result, they can be better influenced, which ultimately qualifies the motor for field weakening and thus for operation at high speeds.
Application areas of PM reluctance hybrid motors
Motors with buried magnets are used primarily in traction applications but can also be used for ship’s drives or generators. In particular, drives that profit from the good field weakening ability, in other words, require less torque in the upper speed range, benefit from a PM reluctance hybrid motor. This synchronous motor variant with buried mag-nets is thus optimally suited for most traction drives.
Advantages and disadvantages of PM reluctance hybrid motors
• High efficiency
• Very much better field weakening ability than purely PM motors
• Smaller and lighter than asynchronous motors
• Suitable for direct drive
• More expensive than asynchronous motors
• In the case of an error, overvoltage must be stopped with an active short-circuit. However, optimizations by ARADEX cause this to happen only at very low and thus harmless speeds.
Further motor topologies