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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST7MC1 датащи(PDF) 179 Page - STMicroelectronics |
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ST7MC1 датащи(HTML) 179 Page - STMicroelectronics |
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179 / 308 page  ST7MC1/ST7MC2 179/308 MOTOR CONTROLLER (Cont’d) 10.6.7.5 Speed Measurement Mode Motor speed can be measured using two methods depending on sensor type: period measurement or pulse counting. Typical sensor handling is de- scribed here. Incremental encoders allows accurate speed measurement by providing a large number of puls- es per revolution (ppr) with ppr rates up to several thousands; the higher the ppr rate, the higher the resolution. The proposed method consists of counting the number of clock cycles issued by the Incremental Encoder Interface (Encoder Clock) during a fixed time window (refer to Figure 100). The tachogenerator has a much lower ppr rate than the encoder (typically factor 10). In this con- text, it is more meaningful to measure the period between Tacho Captures (i.e. relevant transitions of the incoming signals). Accuracy is imposed by the reference clock, i.e. the CPU clock (refer to Figure 99). Figure 99. Tachogenerator period acquisition using MTIM timer Figure 100. Encoder Clock frequency measure using MTIM timer C S C C C C C C Comparator Output Tacho Capture Compare Value MTIM Counter Value Interrupts Decreasing Speed S C To interrupt generator To interrupt generator (Capture Event) (Speed Error Event) Encoder Clock Capture (triggered by software MTIM Counter Value C C C C C C C Interrupts Decreasing Speed C To interrupt generator (Capture Event) or Real Time Clock) 1 |
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