The magnetic screw motor (MSM) drive systems often require both a rotary encoder and a linear encoder for their precise positioning, which makes the design of such systems very challenging and costly. This article pro...
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The magnetic screw motor (MSM) drive systems often require both a rotary encoder and a linear encoder for their precise positioning, which makes the design of such systems very challenging and costly. This article proposes a novel position sensorless control strategy. First, an improved pulsating current injection (IPCI) sensorless control is proposed to replace the rotary encoder. This method associates the amplitude of the injection signal with the q-axis current by introducing a transformation matrix. In the proposed method, the amplitude of the injection signal increases with the load/speed variation, which enhances the rotary speed estimation accuracy in transients. Meanwhile, when the motor operates in a steady state, the amplitude of the injection signal is maintained in a low range, which reduces the audible noise. Second, the linear encoder is eliminated using a relative speed compensation based on a lookup table (LUT) method. The relative speed under different linear speeds can be obtained and tabulated from several experimental tests. The presented experimental results verify the proposed method and its performance.
In the paper performances of the pulsating current injection based sensorless control of permanent magnet synchronous motor (PMSM) are analyzed theoretically and investigated by simulations. In the analyses, the effec...
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ISBN:
(纸本)9781479951628
In the paper performances of the pulsating current injection based sensorless control of permanent magnet synchronous motor (PMSM) are analyzed theoretically and investigated by simulations. In the analyses, the effects of the speed EMF terms and the deviations between the actual highfrequency carrier currents and the commands, which results from the limited gain and bandwidth of the current controller, are all taken into account. It is shown that the pulsating current injection method can achieve stable position estimation in a wide speed range. But appreciable position errors will result at high speeds due to the cross-coupling effects of the speed EMFs and the tracking errors between the actual and command carrier currents. In order to improve the position estimation accuracy, three modified schemes are proposed and analyzed. Their validities are confirmed by simulations.
This paper focuses on the improvement of pulsating current injection based sensorless control of surface-mounted permanent-magnet synchronous motors (SPMSM). Conventional practice applies band pass and low pass filter...
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ISBN:
(纸本)9781509012107
This paper focuses on the improvement of pulsating current injection based sensorless control of surface-mounted permanent-magnet synchronous motors (SPMSM). Conventional practice applies band pass and low pass filters to track the position information. However, since filtering effect of low order filter is not ideal, the high order filter is generally used to process the position signal. But this would introduce a certain delay and increase the calculation burden. To solve this problem, a novel position observer is proposed which achieves ideal filtering effect and reduces the computation burden of the system. The experimental results based on RT-LAB platform verify the feasibility of the designed observer.
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