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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN4158 датащи(PDF) 13 Page - STMicroelectronics |
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AN4158 датащи(HTML) 13 Page - STMicroelectronics |
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13 / 34 page  DocID023635 Rev 2 13/34 AN4158 Phase current control in stepper motor driving 34 The back electromotive force (BEMF) is the voltage generated by the rotating magnetic field of the rotor as an effect of Faraday’s law of induction. Its effect can be modeled as a sinewave voltage generator with frequency equal to a quarter of the motor full step rate and amplitude proportional to the rotation speed (see Equation 3). Equation 3 The BEMF effect on the current control system is to counter the voltage applied by the power stage limiting the phase current (especially at high speed). In general, as explained in the following paragraphs, the BEMF voltage may make it more difficult to regulate the desired current. The algorithm implemented by the controller determinates the performance of the application, in particular when microstepping driving is used. Figure 7. Motor phase electrical model R Ph V BEMF L Ph Motor phase equivalent circuit AM15109v1 A VBEMF Ke fBEMF = B fBEMF fstep 4 ----------- = |
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