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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L6238 датащи(PDF) 26 Page - STMicroelectronics |
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L6238 датащи(HTML) 26 Page - STMicroelectronics |
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26 / 35 page  For laboratory evaluation purposes, a simple re- sistive network as shown in figure 28 can be used to emulate the Bemf of the motor. The actual Bemf zero-crossing is 30 electrical de- grees (50% of a commutation interval) away from the optimal switch point. A digital counter circuit measures 50% of the previous interval to deter- mine the next interval’s commutation delay from the zero crossing. During the low RPM stages of start up the long commutation intervals may cause the counter to overflow, in which case 50% of the max count will be less than 50% of the ideal commutation interval. Therefore, the torque will not be optimal until the desired commutation interval is less than the dynamic range of the counter. 6.0 SERIAL PORT Figure 27: Bemf Amplifier. Figure 28: Bemf Emulator. L6238 26/35 |
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