Abstract
Variable flux memory machines (VFMM) use magnetization and demagnetization manipulations to adjust machine voltage, achieving wide-speed high-efficiency operation. The machine magnetization state manipulation is a critical concern in the VFMM control. Thus, this article proposes an on-line magnetization state estimation and closed-loop control using the magnetization manipulation signals. The magnetization state manipulation requires voltage injection to create the manipulation current. The current shows non-linear response at different magnetization state because the current changes the magnets state and the machine saturation level. The flux change rate, which is calculated by the injected voltage and the current response, is affected by the non-linearity and utilized in the proposed method for the magnetization state estimation. The proposed magnetization state estimation achieves self-sensing characteristic because the signals in the estimation already exist in the magnetization state manipulation. Based on the estimated and the target magnetization state, the closed-loop magnetization state control is achieved by the voltage injection regulation.
Highlights
The permanent magnet synchronous machines (PMSM) have been widely used in the variable-speed applications [1], [2]
The injected voltage together with the current response are used as the source of the magnetization state estimation
The flux change rate, which is calculated by the injected voltage and the current response, reveals the inductance non-linearity in the magnetization state control
Summary
The permanent magnet synchronous machines (PMSM) have been widely used in the variable-speed applications [1], [2]. Based on the finite element analysis result that establishes the relation between dψ/di and the MS, the proposed method estimates the MS and regulates the manipulation voltage, achieving the close-loop MS control. The flux change rate increases along the direction of MS dropping, which is caused by the reducing saturation level in the demagnetization manipulation. The relation between the MS and the flux change rate is independent of the machine speed and the machine voltage This relation is affected by the q-axis current during the MS manipulation period. The rotation voltage urfd, requires the q-axis flux, which shows high nonlinearity because of the machine saturation during the MS manipulation. The induction voltage uid and the d-axis flux change can be calculated in the difference form as shown in (5) and (6), respectively. The estimation error will not accumulate across different manipulations
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