Stable electromagnetic braking method and apparatus applicable to brushless direct current motor
A technology of brush DC motor and electromagnetic braking, which is applied in the direction of stopping device and torque ripple control, etc. It can solve problems such as fluctuation, unresolved commutation torque, and inability to provide sufficient braking torque.
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[0111] (1) Calculate ω according to formula (2) cut =26.2rad / s, converted to speed n cut =250.1r / min.
[0112] (2) Calculate ω according to formula (7) con =20.9rad / s, converted to speed n con =199.7r / min.
[0113] (3) The maximum value of torque fluctuation allowed in this embodiment is ΔT=0.2N·m, by Δi=ΔT / (2K e ) to obtain the maximum current variation corresponding to the maximum torque ripple as Δi=0.78A.
[0114] (4) put ω cut , ω con Substituting and Δi into the modulation strategy switching judgment process is Figure 5 .
[0115] (5) Write the subsection PI control algorithm as the main controller algorithm. see Figure 6 , the segmented PI controller in this embodiment consists of three traditional PI controllers f 1 , f 2 and f 3 , whose outputs are respectively d 1 、d 2 and d 3 . where controller f 1 The low-speed zone [0, n*] controlling the braking state, n* is determined by the modulation strategy switch judger; the controller f 2 and f 3 Cont...
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