Unique Design for Position Feedback Setup in a PMSM for a Hybrid Driveline
Dr. Riaz Ahmed, Carts GmbH - Real Time Solution
Permanent magnet synchronous motors (PMSMs) need magnetic flux position feedback for the torque or speed control algorithm. Conventionally, this magnetic flux position feedback system consists of N pairs of permanent magnets arranged in a ring shape and two Hall sensors. This position feedback system has many problems associated with it—including inaccurate magnetic pole lengths, inaccurate distribution of magnetic field strength along the magnetic rings, electromagnetic field influence on the Hall sensors, inaccurate axial position of two Hall sensors, error due to radial separation between two Hall sensors, and temperature and applied voltage variation between two Hall sensors—that produce inaccuracies in magnetic flux position calculation. The N pair of magnetic poles and ring structure make this setup very expensive.
本次会议提出了一个新的设置,该设置由安装在转子轴上的凸轮,一对磁极,安装在凸轮链路杆上的单个2轴霍尔传感器和软件算法来计算准确的磁通位置。凸轮的凹槽等于杆对数的一半。霍尔传感器在磁极对上的单向行程将确定一对转子永久磁场的位置。该设置可以在电动机外壳之外,从而减少对霍尔传感器信号的电磁影响。
Recorded: 17 Apr 2012
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