A comparison between interior permanent magnet (IPM) and surface permanent magnet (SPM) motors.
Which advantages you can get using this type of motors on construction, agricutlural and industrial machines?
Electric Vehicles make use of permanent magnet synchronous traction motors for their high torque density and efficiency. The main result of the proposed analysis is to put in evidence the different behavior of IPM and SPM motors.
Perhaps the biggest advantage of IPM designs, one that gives them an edge in vehicle applications like traction motors, is the high-speed performance. The power versus speed curve for SPM motors is roughly hyperbolic, rising to a region of quasi-constant power over a narrow speed range, then falling off.
For decades, surface permanent-magnet (SPM) motors dominated the market for permanent magnet motors. In recent years, however, the emerging hybrid and electric vehicle market, have boosted demand for interior permanent magnet (IPM) motors. With advantages like near-constant power over a broad speed range and a magnet-retaining design, IPM motors provide a good solution for applications like traction and auxiliary motors.
For vehicle applications IPM technique provides big benefits compared to SPM motors. The IPM configuration allows more control over the magnetization of the magnetic circuit.
High torque is achieved by using reluctance torque in addition to magnetic torque.
IPM motors consumes up to 30% less power compared to conventional SPM motors.
It can respond to high-speed motor rotation by controlling the two types of torque using vector control.
Mechanical safety is improved as, unlike in a SPM, the magnet will not detach due to centrifugal force.
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