Abstract
Conventional position sensors for permanent magnet synchronous motor, such as optical encoder, resolver, or hall sensor, can get fault by the stress. The fault of the motor position sensor may cause serious accidents. Thus, to prevent damages by the position sensor failure, adding a redundancy sensor such as wound search coil is recommendable. In this paper, a new planar search coil design that can be used as a position sensor for permanent magnet synchronous motor is proposed. This new design is a planar coil based on a flexible-printed circuit board that converts airgap flux to a back-electromotive force signal. Unlike the wound search coil design, the proposed design is advantageous for manufacturing and slot-space preservation. Also, this new design is distant from the motor main winding. As a result, the exposure of the electrical and thermal stresses to the sensing coil can be decreased. This research shows the mathematical model for the design of the new planar-shaped airgap flux search coil design. In addition, the position estimation algorithm based on the new search coil design is shown. Finally, the position estimation using the new search coil design is presented.
Highlights
Electric motors are widely used in modern industries such as electric vehicles, aircraft, home appliances and manufacturing
Owing to the filtering algorithm based on adaptive peak filter (APF) and phase-locked loop (PLL), the noise due to the motor operation is canceled
This study proposes a new planar-type search coil (PSC) for rotor position estimation
Summary
Electric motors are widely used in modern industries such as electric vehicles, aircraft, home appliances and manufacturing. The internal permanent magnet synchronous motor (IPMSM) is widely used due to its highpower density and high efficiency [1,2,3]. It is used as a major power source in more areas due to the performance improvement of motor systems. Hall sensors, and resolvers are widely used in motors. Encoder and resolver provide acceptable angular position information, and recent studies have shown that hall sensors can provide each location [8,9,10,11,12,13,14,15,16,17].
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