ã¯ããã«
髿§èœã®ãµãŒãã»ã¢ãŒã¿ã¯ã次ã®ãããªç¹åŸŽãåããŠããå¿ èŠããããŸãããŸããã¹ããŒã«ãçºçããªãéããæ»ãããªå転ãå®çŸããªããã°ãªããŸããããŸããã¹ããŒã«ã»ãã«ã¯ãå®å šã«å¶åŸ¡ããå¿ èŠããããŸããæŽã«ãè¿ éãªå æžéãå®çŸã§ãããã®ã§ãªããã°ãªããŸãããåŸæ¥ãå¯å€éãã©ã€ãã«ã¯ãäž»ãšããŠå¶åŸ¡æ§ã«åªããDCã¢ãŒã¿ã䜿ãããŠããŸãããããããææ°ãã€é«æ§èœã®ã¢ãŒã¿ã»ãã©ã€ãã»ã·ã¹ãã ã¯ã3çžACã¢ãŒã¿ãããŒã¹ã«ããŠããã¯ãã§ãããã®çš®ã®ã¢ãŒã¿ã®äŸãšããŠã¯ãACèªå°ã¢ãŒã¿ïŒACIMïŒAC Induction MotorïŒãæ°žä¹ ç£ç³åæã¢ãŒã¿ïŒPMSMïŒPermanentmagnet Synchronous MotorïŒãªã©ãæããããŸãã3çžACã¢ãŒã¿ã¯ãã·ã³ãã«ã§å ç¢ãªæ§é ãæ £æ§ã®äœããé鿝ã§èŠãå Žåã®å€§ããªåºåãåªããé«éå転æ§èœãšãã£ãç¹åŸŽãåããŠããŸãããã®çš®ã®ã¢ãŒã¿ã¯ãèŠæ±ã®å³ãããµãŒãã»ã¢ãŒã¿ã»ã¢ããªã±ãŒã·ã§ã³ã«æé©ãªãã®ãšããŠãDCã¢ãŒã¿ã«åã£ãŠä»£ããååšã«ãªã£ãŠããŸãã
ããããACã¢ãŒã¿ã®å¶åŸ¡æ¹æ³ãšããŠã¯ãã¯ãã«å¶åŸ¡ã䜿çšãããŸããæ¢ã«ããã®åçã¯ååã«ç¢ºç«ãããŠããŸãããŸããææ°ãã€é«æ§èœã®ãã©ã€ãã®ã»ãšãã©ã¯ãããžã¿ã«æ¹åŒã®ã¯ããŒãºãã«ãŒã黿µå¶åŸ¡ã®ææ³ãæ¡çšããŠããŸããããããã·ã¹ãã ã«ãããŠéæå¯èœãªã¯ããŒãºãã«ãŒãã®åž¯åå¹ ã¯ãæŒç®è² è·ã®å€§ãããã¯ãã«å¶åŸ¡ã®ã¢ã«ãŽãªãºã ããããã«é¢é£ãããã¯ãã«å転ããªã¢ã«ã¿ã€ã ã§å®è¡ããé床ã«çŽæ¥çã«äŸåããŸããããããæŒç®è² è·ã®åé¡ãããçŸåšãå€ãã®é«æ§èœãã©ã€ãã¯DSPãæ¡çšããŠããŸããDSPãå©çšããããšã«ãããã¢ãŒã¿ãšãã¯ãã«ã®å¶åŸ¡æ¹åŒãçµã¿èŸŒã¿åã§å®è£ ãããŠãããšããããšã§ããDSPãæ¬è³ªçã«åããæŒç®èœåã«ãããéåžžã«çããµã€ã¯ã«æéãå®çŸãããŸãããŸããã¯ããŒãºãã«ãŒãã®é»æµå¶åŸ¡ã«ãããŠã2kHzïœ4kHzã®åž¯åå¹ ãå®çŸããããšãå¯èœã«ãªããŸãã
äžè¿°ãããããªã¢ãŒã¿ã®å®å šãªé»æµå¶åŸ¡ãå®çŸããã«ã¯ãé«ç²ŸåºŠã®PWMïŒPulse Width ModulationïŒãã«ã¹å¹ å€èª¿ïŒå¶åŸ¡ã«ããé»å§ã®çææ¹åŒãšãã¢ãŒã¿ã®é»æµæž¬å®ã«äœ¿çšããé«åè§£èœã®A/Dã³ã³ããŒã¿ïŒADCïŒãå¿ èŠã«ãªããŸããææ°ã®ãã¯ãã«ã»ã³ã³ãããŒã©ã«ã¯ãããŒã¿ã®äœçœ®ããã£ãŒãããã¯ããä»çµã¿ãäžå¯æ¬ ã§ãããã®ç®çã¯ãé床ããŒãã«ãªããŸã§ãã«ã¯ãæ»ããã«å¶åŸ¡ã§ããããã«ããããšã§ããããã«åããŠãå€ãã®ã·ã¹ãã ã¯ãã¬ãŸã«ããã€ã³ã¯ãªã¡ã³ã¿ã«ã»ãšã³ã³ãŒããšãã£ãããŒã¿äœçœ®åãã®ãã©ã³ã¹ãã¥ãŒãµãæèŒããŠããŸããã¢ããã°ã»ããã€ã»ãºã¯ã3çžACã¢ãŒã¿åãã®é«æ§èœã³ã³ãããŒã©ãšããŠãADMC401ããªã©ã®è£œåãæäŸããŠããŸããæ¬çš¿ã§ã¯ããããã補åã®ããŒã¹ãšãªãåºæ¬åçã«ã€ããŠèª¬æããŸããADMC401ã¯ã匷åãªDSPã³ã¢ãæè»æ§ã®é«ãPWMçºçåšãé«åè§£èœã®ADCããšã³ã³ãŒãã»ã€ã³ã¿ãŒãã§ãŒã¹ã»ãŠããããåããã¢ãŒã¿ã»ã³ã³ãããŒã©ICã§ãã
ACã¢ãŒã¿ã®å¯å€éå¶åŸ¡
3çžACã¢ãŒã¿ã®å¯å€éå¶åŸ¡ãå¹ççã«è¡ãã«ã¯ãåšæ³¢æ°ãå¯å€ã§ãã©ã³ã¹ã®ãšãã3çžã®å¯å€é»å§ãçæããå¿ èŠããããŸããéåžžãå¯å€åšæ³¢æ°ã®é»æºã¯ãDCé»å§ãåºã«MOSFETãIGBTãªã©ã®ã¹ã€ããïŒä»¥äžããã¯ãŒã»ã¹ã€ããïŒã䜿çšãã倿åŠçã«ãã£ãŠçæããŸããå³1aã¯ãäžè¬çãªãã¯ãŒã»ã³ã³ããŒã¿ã®æ§æã瀺ãããã®ã§ãããã®åè·¯ã¯2æ®µæ§æã§å®çŸãããŠããŸãããŸã1段ç®ã§ã¯ãåºå®åšæ³¢æ°ïŒ50Hz/60HzïŒã®AC黿ºãæŽæµããDCãªã³ã¯é»å§VDãçæããŸãããã®é»å§ã«ãããDCãªã³ã¯ã»ã³ã³ãã³ãµãå é»ãããŸããæ¬¡ã«ããã®é»å§ã2段ç®ã«çžåœããã€ã³ããŒã¿åè·¯ã«äŸçµŠããŸããããã«ãããã¢ãŒã¿åãã®å¯å€åšæ³¢æ°ã®ACé»åãçæããŸããã€ã³ããŒã¿åè·¯ã®ãã¯ãŒã»ã¹ã€ããã¯ãã¢ãŒã¿ã®ç«¯åãVDãŸãã¯ã°ã©ãŠã³ãã«æ¥ç¶ãã圹å²ãæãããŸãããã®ãããªåäœã«ãããé«ãå¹çãåŸãããšãã§ããŸãããªããªãããããã®ã¹ã€ããã«ããæå€±ã¯ãçæ³çã«ã¯ãªã³ïŒãªãã©ã¡ãã®ç¶æ ã§ããŒãã«æããããããã§ãã
6åã®ã¹ã€ãããé æ¬¡é«éã«ééããããšã«ãããå¹³åãããšæ£åŒŠæ³¢åºåãåŸããã3çžã®ACé»å§ãçæããããšãã§ããŸããå®éã®åºåé»å§ã¯ãå³1bã«ç€ºããããªé«åšæ³¢ã®PWM波圢ãšãªããŸãããã¯ãŒã»ã¹ã€ããïŒICïŒã䜿çšããå®çšçãªã€ã³ããŒã¿åè·¯ã§ã¯ãçŽ20kHzãšããé«éãªã¹ã€ããã³ã°ãå®çŸã§ããŸãããŸãããã¹ãŠã®é»å§ã®é«èª¿æ³¢æåãéåžžã«é«ãåšæ³¢æ°ã«çŸããé«åºŠãªææ³ã«ãã£ãŠPWM波圢ãçæããããšãå¯èœã§ãããããã®æåã®åšæ³¢æ°ã¯ãå ¬ç§°0Hzïœ250Hzã®ç¯å²ã«ããåºæ¬åšæ³¢æ°ãååã«äžåããŸãã
ã¢ãŒã¿ã®èªå°æ§ãªã¢ã¯ã¿ã³ã¹ã¯åšæ³¢æ°ãšå ±ã«å¢å ããŸãããã®ããã髿¬¡ã®é«èª¿æ³¢ã®é»æµã¯éåžžã«å°ãªããªããæ£åŒŠæ³¢ã«è¿ã黿µãã¹ããŒã¿ã®å·»ç·ã«æµããŸããã€ã³ããŒã¿ã®åºæ¬é»å§ãšåºååšæ³¢æ°ã¯ãå³1bã«ç€ºãããã«ãé©åãªã³ã³ãããŒã©ã䜿çšããŠPWM波圢ãå€åãããããšã§èª¿æŽããããšãå¯èœã§ããåºæ¬åºåé»å§ãå¶åŸ¡ããéã«ã¯ãPWMåŠçã«ãã£ãŠåºåé»å§æ³¢åœ¢ã®é«èª¿æ³¢æåãå€åããããšã¯é¿ããããŸãããéèŠãªã®ã¯ãå€èª¿ã«é¢ããé©åãªæŠç¥ã確ç«ããããšã§ããããã«ãããé«èª¿æ³¢ã®é»å§ãšãããã«é¢é£ããŠã¢ãŒã¿ã«åã¶åœ±é¿ãé«åšæ³¢ã®æå€±ãæå°éã«æããããšãå¯èœã«ãªããŸãã


a. 3çžACã¢ãŒã¿ãé§åããããã«äœ¿çšãããã¯ãŒã»ã³ã³ããŒã¿ã®äžè¬çãªæ§æ
b. ã¢ãŒã¿ã®é§åçšã«å¯å€é»å§ïŒå¯å€åšæ³¢æ°ã®é»æºãçæããéã®ä»£è¡šçãªPWM波圢
PWMä¿¡å·ã®çæ
ACã¢ãŒã¿çšã®ã³ã³ãããŒã©ã®äžè¬çãªèšèšã§ã¯ãPWMä¿¡å·ã®çæåŠçãå®çŸããããã®ããŒããŠã§ã¢ãšãœãããŠã§ã¢ã«ã€ããŠèæ ®ããå¿ èŠããããŸããçæããPWMä¿¡å·ã¯ãæçµçã«3çžã€ã³ããŒã¿å ã®ãã¯ãŒã»ã¹ã€ããããªã³ïŒãªãããããã«äœ¿çšãããŸããäžè¬çãªããžã¿ã«å¶åŸ¡ã«ãããŠãã³ã³ãããŒã©ã¯PWMã®ã¹ã€ããã³ã°åšæ³¢æ°ïŒå ¬ç§°10kHzïœ20kHzïŒã«å¿ãã宿çãªã¿ã€ãã³ã°ã§å²ã蟌ã¿ãçºçãããŸããå²ã蟌ã¿ãµãŒãã¹ã»ã«ãŒãã³ã§ã¯ãã³ã³ãããŒã©ã®ãœãããŠã§ã¢ã«ãããã€ã³ããŒã¿ã®3ã€ã®ã¬ã°ãåã ã«é§åããããã®PWMä¿¡å·ã®æ°ããªãã¥ãŒãã£ã»ãµã€ã¯ã«ã®å€ãèšç®ãããŸãããã®å€ã¯ã枬å®ãããã¢ãŒã¿ã®ç¶æ ïŒãã«ã¯ãé床ïŒãšç®æšãšããåäœç¶æ ã®äž¡æ¹ã«å¿ããŠæ±ºå®ããŸãããã¥ãŒãã£ã»ãµã€ã¯ã«ã¯ãã¢ãŒã¿ã®å®éã®åäœç¶æ ããç®æšãšããè»è·¡ããã©ããããµã€ã¯ã«ããšã«èª¿æŽãããŸãã
ããã»ããµã«ãã£ãŠãã¥ãŒãã£ã»ãµã€ã¯ã«ã®å€ãç®åºããããæ¬¡ã®PWMïŒã³ã³ãããŒã©ã®ãµã€ã¯ã«ã«ããã£ãŠPWMä¿¡å·ã確å®ã«çºçãããããã«ãå°çšããŒããŠã§ã¢ãšããŠæ§æããPWMçºçåšã䜿çšããŸããäžè¬ã«ãPWMçºçåšã¯ãéåžžã«æ£ç¢ºãªã¿ã€ãã³ã°ã®ä¿¡å·ãçºçãããããã«ãé©åãªæ°ã®ã¿ã€ããŒãšã³ã³ãã¬ãŒã¿ã䜿ã£ãŠæ§æãããŸããäžè¬çã«ã¯ãPWMçšã®ã¿ã€ãã³ã°æ³¢åœ¢ã®çæã«ã¯10ïœ12ãããã»ã¬ãã«ã®æ§èœãæãŸããŸããADMC401ã®PWMçºçåšã®å Žåã38.5ããç§ã®ãšããžåè§£èœãåããŠããŸããããã¯ãã¹ã€ããã³ã°åšæ³¢æ°ã10kHzã®å Žåã§çŽ11.3ãããã®åè§£èœã«çžåœããŸããå³2ã«ç€ºããã®ã¯ãADMC401ã®å°çšPWMçºçåšã«ãã£ãŠçºçãããæšæºçãªPWMä¿¡å·ã§ããããã§ã¯ã€ã³ããŒã¿ã®ã¬ã°Aã«å¯Ÿå¿ããä¿¡å·ãäŸã«ãšã£ãŠããŸããå³äžã®AHã¯ãã€ã³ããŒã¿ã®ã¬ã°Aã«ããããã€ãµã€ãã®ãã¯ãŒã»ã¹ã€ããã®é§åã«äœ¿çšããŸããäžæ¹ãALã¯ããŒãµã€ãã®ãã¯ãŒã»ã¹ã€ããã®é§åã«äœ¿çšãããŸãããã¥ãŒãã£ã»ãµã€ã¯ã«ãå€åãããã¢ãŒã¿ã«å°å ããå¹³åé»å§ããµã€ã¯ã«ããšã«å¹æçã«èª¿æŽããããšã«ãããç®æšãšããå¶åŸ¡ãå®çŸããããšãå¯èœã«ãªããŸãã
äžè¬ã«ãäžæ¹ã®ãã¯ãŒã»ã¹ã€ããïŒäŸãã°ALïŒãã¿ãŒã³ã»ãªãããŠããããäžæ¹ã®ãã¯ãŒã»ã¹ã€ããïŒAHïŒãã¿ãŒã³ã»ãªã³ãããŸã§ã«ã¯ãããããªé å»¶æéã確ä¿ããå¿ èŠããããŸãããã®ãããã»ã¿ã€ã ãå¿ èŠã«ãªãã®ã¯ãäžæ¹ã®ã¹ã€ãããã¿ãŒã³ã»ãªã³ãããŸã§ã«ãã¿ãŒã³ã»ãªãããåŽã®ããã€ã¹ãé»å§ïŒé»æµã黿¢ããèœåãå埩ããããã®ååãªæéã確ä¿ããªããã°ãªããªãããã§ãããã®ãããã»ã¿ã€ã ãååšããªããã°ãDCé»å§ã®ç絡ãçºçããå¯èœæ§ããããŸããADMC401ã®PWMçºçåšã¯ãPWMä¿¡å·ã«èªåçã«ãããã»ã¿ã€ã ãæ¿å ¥ããããã®ããŒããŠã§ã¢ãåããŠããŸãã

3çžACã¢ãŒã¿çšã®ã³ã³ãããŒã©ã®äžè¬çãªæ§é
ã¢ãŒã¿ãé©åã«é§åããããã«å¿ èŠãªããšã¯ã端çã«èšãã°ããã®ãã«ã¯ãšé床ã®äž¡æ¹ãæ£ç¢ºã«å¶åŸ¡ããããšã§ããäžè¬ã«ãã¢ãŒã¿ã®é床ã¯ãé©åãªãã©ã³ã¹ãã¥ãŒãµã䜿çšããŠé床ãã®ãã®ãŸãã¯äœçœ®ã枬å®ããããšã«ãã£ãŠçŽæ¥å¶åŸ¡ããŸããäžæ¹ããã«ã¯ã¯ãã¢ãŒã¿ã®çžé»æµãé©åã«èª¿æŽããããšã«ãã£ãŠéæ¥çã«å¶åŸ¡ããŸããå³3ã«ç€ºããã®ã¯ã3çžã¢ãŒã¿çšã®ã³ã³ãããŒã©ã®æ§æäŸã§ããããã¯ãæšæºçãªåæåŒã®åº§æšé»æµã³ã³ãããŒã©ã«çžåœããŸãããã®å³ã«ã¯ãADMC401ã®ãããªã¢ãŒã¿ã»ã³ã³ãããŒã©ã®ãœãããŠã§ã¢ã»ã³ãŒãã»ã¢ãžã¥ãŒã«ããã¢ãŒã¿å¶åŸ¡ã«å°çšã®ããªãã§ã©ã«ã«ãããã¿ã¹ã¯ã®é åã瀺ããŠããŸãããã®ã³ã³ãããŒã©ã¯ãå šäœãšããŠã¯2ã€ã®PIDïŒæ¯äŸâç©åâ埮åïŒé»æµã¬ã®ã¥ã¬ãŒã¿ã«ãã£ãŠæ§æãããŠããŸããPID黿µã¬ã®ã¥ã¬ãŒã¿ã¯ã枬å®ãããããŒã¿ã®äœçœ®æ å ±ã«åæããŠå転ããåºæºåº§æšç³»ãããŒã¹ãšããã¢ãŒã¿ã®é»æµãã¯ãã«ãå¶åŸ¡ããããã«äœ¿çšãããŸãã
å Žåã«ãã£ãŠã¯ãé»å§ãšé床ãåé¢ããé床ã«é¢ããäŸåæ§ãæé€ãããšå ±ã«ãé¢é£ãã軞ã®ã¯ãã¹ã»ã«ãããªã³ã°ãå¶åŸ¡ã«ãŒãããæé€ããããšãæãŸããã±ãŒã¹ããããŸããåºæºé»å§ã®æåã¯ãSVMïŒSpace Vector ModulationïŒç©ºéãã¯ãã«å€èª¿ïŒãã¯ãããšããé©åãªPWMã®æŠç¥ã«åºã¥ããã€ã³ããŒã¿ã§åæããŸãããŸããã€ã³ããŒã¿ã®ã¹ã€ããã³ã°ã«ããããããã»ã¿ã€ã ãã€ã³ããŒã¿ã«ããããªã³ã®ç¶æ ã®æéé»å§ãDCãªã³ã¯é»å§ã®ãªããã«ã«ããæªã¿ã®åœ±é¿ãåé¿ããããã®è£åæ©æ§ãçµã¿èŸŒãããšãå¯èœã§ãã

ã¹ããŒã¿ã«ããã黿µãã¯ãã«ã®2ã€ã®æåã¯ãd軞ïŒdirect-axisïŒæåãšq軞ïŒquadrature-axisïŒæåãšããŠç¥ãããŠããŸãããããã®ãã¡ãd軞ã®é»æµã¯ã¢ãŒã¿ã®ç£æãå¶åŸ¡ããŸããéåžžãæ°žä¹ ç£ç³ã¢ãŒã¿ã§ã¯ç£æããŒãã«ãªãããã«å¶åŸ¡ãããŸããã¢ãŒã¿ã®ãã«ã¯ã¯ãqè»žã®æåã調æŽããããšã«ãã£ãŠçŽæ¥å¶åŸ¡ããããšãå¯èœã§ããæ¥å éãæ¥æžéããããã¯ããããè·éæ¡ä»¶ã®äžã§é床ããŒãã«ãªããŸã§æ»ãããªå転ãç¶æããããã«ã¯ã髿§èœã®ãã©ã€ãã«ãã£ãŠé«éãã€æ£ç¢ºãªãã«ã¯å¶åŸ¡ãè¡ãããšãäžå¯æ¬ ã§ãã
å®éã®d軞ãšq軞ã®é»æµæåã¯ã黿µæ€åºçšã®é©åãªãã©ã³ã¹ãã¥ãŒãµã«ãã£ãŠã¢ãŒã¿ã®çžé»æµãæ€åºãããããã·ã¹ãã ãåããADCã«ãã£ãŠããžã¿ã«å€ã«å€æããããšã«ãã£ãŠååŸããŸããéåžžã¯ãã¢ãŒã¿ã®ç·é»æµã®ãã¡2ã€ãåæã«ãµã³ããªã³ã°ããã ãã§ååã§ãããªããªãã3ã€ã®é»æµã®åèšå€ã¯ãŒããªã®ã§ã3ã€ç®ã®é»æµã®å€ãå¿ èŠã§ããã°ãä»ã®2ã€ã®é»æµã®å€ããå°åºãããšãå¯èœã ããã§ãã
ã³ã³ãããŒã©ã®ãœãããŠã§ã¢ã§ã¯ãæ°åŠçãªãã¯ãã«å€æã䜿çšããããšãã§ããŸããããŒã¯ïŒParkïŒå€æã䜿çšããã°ãããããåäœæ¡ä»¶ã®äžã§ã¢ãŒã¿ã«å°å ããã3çžã®é»æµãå®éã®ã¢ãŒã¿ã®è»žã®å転ã«åæãããããšãå¯èœã§ãããã®åæåŠçã«ãããã¢ãŒã¿ã¯é»æµã«å¯ŸããŠåžžã«æé©ãªãã«ã¯ãçæããããšãã§ããŸããã€ãŸããæé©ãªå¹çã§åäœããããšãå¯èœã«ãªããŸãããã¯ãã«ã®å転ã«ã¯ã枬å®ããããŒã¿è§ã®æ£åŒŠé¢æ°ãšäœåŒŠé¢æ°ããªã¢ã«ã¿ã€ã ã«èšç®ããåŠçã«å ããå€ãã®ç©åæŒç®ãå¿ èŠã«ãªããŸããå¶åŸ¡ã«ãŒãå šäœã®åž¯åå¹ ã¯ãã¯ããŒãºãã«ãŒãå¶åŸ¡ã«å¿ èŠãªæŒç®ã®å®è¡é床ãšãããã«å¿ããŠæ°ãããã¥ãŒãã£ã»ãµã€ã¯ã«ã®å€ãç®åºããé床ã«äŸåããŸãã26MIPSã16ãããã®åºå®å°æ°ç¹DSPã³ã¢ã§ããã°ãããã«å¯Ÿå¿å¯èœãªé«éæŒç®èœåãåããŠãããšèšããŸããèšãæããã°ããã®çš®ã®çµã¿èŸŒã¿ã¢ãŒã¿å¶åŸ¡ã®ã¢ããªã±ãŒã·ã§ã³ã«çæ³çãªæŒç®çšã®ãšã³ãžã³ãšããŠå©çšã§ãããšããããšã§ãã
A/D倿ã®èŠä»¶
髿§èœã®ACãµãŒãã»ãã©ã€ããå¶åŸ¡ããããã«ã¯ã黿µã®åæãµã³ããªã³ã°ãè¡ããåŸãããå€ãé«éãã€é«ç²ŸåºŠã«A/D倿ããå¿ èŠããããŸãããµãŒãã»ãã©ã€ãã«ã¯ã宿 Œåäœç¯å²ãå®çŸ©ãããŠããŸããããã¯ãã¢ãŒã¿ãšãã¯ãŒã»ã³ã³ããŒã¿ã®æž©åºŠäžæã蚱容ç¯å²å ã«ããå Žåã«ãé£ç¶ããŠç¶æã§ããç¹å®ã®åºåã¬ãã«ã®ããšãæããŸãããŸãããµãŒãã»ãã©ã€ãã«ã¯ããŒã¯å®æ Œãå®çŸ©ãããŠããŸããããã¯ã宿 Œé»æµãã¯ããã«è¶ ãã黿µã«çæéã ã察å¿ããèœåã®ããšã§ããäŸãã°ãçæéã®ããŒã¹ã黿µã«ã€ããŠã¯ã宿 Œé»æµã®6åãŸã§å¯Ÿå¿ã§ãããšãã£ãå ·åã§ããããã«ãããäžæçã«å€§ããªãã«ã¯ãå ãããããã©ã€ããéåžžã«çŽ æ©ãå æžéãããããã®åŸãéåžžåäœã®é£ç¶çãªç¯å²ã«æ»ãããããããšãå¯èœã«ãªããŸããèšãæãããšããã©ã€ãã®éåžžã®åäœã¢ãŒãã§ã¯ãå šå ¥åç¯å²ã®ãã¡ããäžéšãã䜿çšãããªããšããããšã«ãªããŸãã
ãã®äžæ¹ã§ã髿§èœã®ã¢ãŒã¿ã«æ±ããããæ»ããã§æ£ç¢ºãªå転ãå®çŸããããã«ã¯ãããããªãªãã»ãããéçŽç·æ§ãè£æ£ãã¹ãã§ãã黿µã»ã³ãµãŒã䜿çšããåè·¯ã§ã¯ãã¢ããã°ä¿¡å·åŠçã«ãããŠã²ã€ã³èª€å·®ãšãªãã»ãã誀差ãçããããšããããããŸããäŸãã°ãç°ãªãå·»ç·ã察象ãšãã黿µæž¬å®ã·ã¹ãã ã®éã§ã²ã€ã³ãäžèŽããŠããªããšãã£ãããšãèµ·ããåŸãŸãããããã圱é¿ãéãªããšããã«ã¯ã«æãŸãããªãæ¯åãçããŸãããããçžåããåè§£èœã®èŠä»¶ãåæã«æºããããã«ãææ°ã®ãµãŒãã»ãã©ã€ãã§ã¯ãã¢ããªã±ãŒã·ã§ã³ã«å¿ èŠãšãããã³ã¹ããšæ§èœã®ãã¬ãŒããªãã«å¿ãã12ïœ14ãããã®ADCã䜿çšãããŸãã
åºæ¬çã«ãã·ã¹ãã ã®åž¯åå¹ ã¯ãæ å ±ãå ¥åããŠããæŒç®ãå®äºãããŸã§ã«ãããæéã«ãã£ãŠå¶éãããŸããäœãã€ã¯ãç§ãã®å€ææéãèŠããADCã䜿çšãããšãã·ã¹ãã ã蚱容ã§ããªãã¬ãã«ã®é å»¶ãçããå¯èœæ§ããããŸããã¯ããŒãºãã«ãŒãã»ã·ã¹ãã ã§é å»¶ãçãããšãã·ã¹ãã ãéæå¯èœãªåž¯åå¹ ãçããªããŸããããã§ã垯åå¹ ã¯é«æ§èœã®ãã©ã€ãã«ãããæãéèŠãªæ§èœææšã®1ã€ã§ãããããã£ãŠãããããã¢ããªã±ãŒã·ã§ã³ã«ã¯ãé«éãªADCãå¿ èŠäžå¯æ¬ ã§ãã
ãã®çš®ã®ã¢ããªã±ãŒã·ã§ã³ã§äœ¿çšãããADCã¯ããã1ã€éèŠãªç¹æ§ãåããŠããå¿ èŠããããŸããããã¯ãã¿ã€ãã³ã°ã«é¢ããæ§èœã§ããåè§£èœãé«ã倿ãé«éã§ããããšã«å ããåæãµã³ããªã³ã°ã«å¯Ÿå¿ã§ããå¿ èŠãããããã§ãã3çžã¢ãŒã¿ã§ã¯ãããç¬éã«ãããã¢ãŒã¿ã®ãã«ã¯ã®ã¹ãããã·ã§ãããååŸããå¿ èŠããããŸãããã®ããã«ã¯ãã¢ãŒã¿ã®3ã€ã®å·»ç·ã®é»æµãæ£ç¢ºãã€åæã«æž¬å®ããªããã°ãªããŸãããæéã¹ãã¥ãŒïŒå黿µæž¬å®ã®éã«çããé å»¶æéïŒã¯ãæž¬å®æ¹æ³ãåå ã§è¿œå ããã誀差èŠå ã«ãªããŸãããã®ãããªçæ³çã§ã¯ãªãç¹æ§ã¯ããã«ã¯ã®ãªããã«ãšããåé¡ã«çŽçµããŸããã€ãŸããéåžžã«æãŸãããªãç¹æ§ã ãšèšããŸãã
ADMC401ãå èµããADCã³ã¢ã¯ãé«ãåè§£èœïŒ12ãããïŒãšé«éæ§èœïŒ6MSPSïŒã®äž¡æ¹ãåããŠããŸããããã ãã§ãªãã2ã€ã®å ¥åä¿¡å·ãåæã«ãµã³ããªã³ã°ã§ããããã«ã2ã€ã®ãµã³ãã«ïŒããŒã«ãã»ã¢ã³ããçµ±åãããŠããŸãïŒãã®ãããå è¿°ããããã«åãã¿ã€ãã³ã°ã«ããã3ã€ç®ã®é»æµå€ãç®åºã§ããŸãïŒããã®ADCã³ã¢ã¯ããã©ãã·ã¥åãå©çšãããã€ãã©ã€ã³åã®ã¢ãŒããã¯ãã£ãæ¡çšããŠããŸããèš8系統ã®ã¢ããã°å ¥åãã£ã³ãã«ãåããŠãããå¶åŸ¡ã¢ã«ãŽãªãºã ã§äœ¿çšãã远å ã®ã·ã¹ãã ä¿¡å·ããã£ãŒãããã¯ä¿¡å·ã®ååŸïŒå€æãå®çŸã§ããŸãããã®ã¬ãã«ã®ç·åçãªæ§èœã¯ãDSPãããŒã¹ãšããçµã¿èŸŒã¿ã¢ãŒã¿ã»ã³ã³ãããŒã©ã§äœ¿çšããããã®ãšããŠã¯æé«æ°Žæºã«ãããšèšããŸãã
äœçœ®ã®æ€åºãšãšã³ã³ãŒãã»ã€ã³ã¿ãŒãã§ãŒã¹ã»ãŠããã
éåžžãã¢ãŒã¿ã®äœçœ®ã¯ãããŒã¿ã®è»žã«åãä»ãããããšã³ã³ãŒãã䜿çšããŠæž¬å®ããŸããã€ã³ã¯ãªã¡ã³ã¿ã«ã»ãšã³ã³ãŒãã䜿çšããå Žåãäžå¯Ÿã®çŽäº€åºåïŒAãšBïŒãçæãããŸããããããã®åºåã«ã¯ãã¢ãŒã¿ã®è»žã1å転ããéã«å€æ°ã®ãã«ã¹ãçŸããŸãã1024ã©ã€ã³ãåããäžè¬çãªãšã³ã³ãŒãã§ã¯ãäž¡æ¹ã®ä¿¡å·ãšããŠ1å転ããã1024ã®ãã«ã¹ãçæãããŸããå°çšã®çŽäº€ã«ãŠã³ã¿ã䜿çšããã°ãåºåä¿¡å·AãBã®äž¡æ¹ã®ç«äžãããšããžãšç«äžãããšããžãã«ãŠã³ãããããšãå¯èœã§ãããã®çµæãããŒã¿ã®è»žã®1å転ã4096çš®ã®å€ã«åå²ãããããšã«ãªããŸããã€ãŸãã1024ã©ã€ã³ã®ãšã³ã³ãŒãã䜿ãã°ãããŒã¿ã®äœçœ®ã12ãããã®åè§£èœã§æž¬å®ã§ãããšããããšã§ããçŽäº€ä¿¡å·AãBã®çžå¯Ÿçãªäœçžãåºã«ãå転æ¹åãæšæž¬ããããšãå¯èœã§ãã
éåžžãã¢ãŒã¿ã»ã³ã³ãããŒã©ã¯å°çšã®ãšã³ã³ãŒãã»ã€ã³ã¿ãŒãã§ãŒã¹ã»ãŠãããïŒEIUïŒEncoder Interface UnitïŒãæèŒããŠããŸããããã«ããããã¥ã¢ã«çŽäº€ãšã³ã³ãŒãã®åºåä¿¡å·ã®å€æã管çãããšå ±ã«ãåžžã«å®éã®ããŒã¿ã®äœçœ®ã衚ããã©ã¬ã«ã®ããžã¿ã«ã»ã¯ãŒããçæãããŸãããã®ãããDSPã®å¶åŸ¡çšãœãããŠã§ã¢ã¯ãã¢ã«ãŽãªãºã ãå¿ èŠãšãããšãã«ã ãå®éã®ããŒã¿ã®äœçœ®ãèªã¿åãã°ãããšããããšã«ãªããŸãã
äžèšã®ãããªã·ã¹ãã æ§æãæ¡çšããã°ãå€ãã®ã¡ãªããã享åã§ããŸããããããããŒã¿äœçœ®ã«å¯Ÿå¿ãããã©ã³ã¹ãã¥ãŒãµã«ã³ã¹ãããããããã¹ããŒã¹ãå²ãããããäœè£ããªãã·ã¹ãã ãå°ãªããããŸãããå®éãã³ã¹ããéèŠããããã«ãæ§èœã«å¯ŸããèŠæ±ãäžãããµãŒãã»ã¢ãŒã¿ã»ãã©ã€ãã®ã¢ããªã±ãŒã·ã§ã³ãå¢ããŠããŸãããã®ãããªå ŽåãããŒã¿ã®äœçœ®ã®æž¬å®å€ã§ã¯ãªãæšå®å€ã䜿çšããããšã«ãããã¢ãŒã¿å¶åŸ¡ã®ã¢ã«ãŽãªãºã ãå®è¡ãããšããããšãè¡ãããŸãã
DSPã³ã¢ã¯ãããŒã¿ã®äœçœ®ãæšå®ããããã«é«åºŠãªã¢ã«ãŽãªãºã ã䜿çšããŸããäŸãã°ãã¢ãŒã¿ã®é»å§ãšé»æµã®æž¬å®å€ããããŒã¿ã®äœçœ®ã®æšå®å€ãæœåºããæ¡åŒµã«ã«ãã³æšå®åšãªã©ã䜿çšãããŸããããã«ãããããŒã¿ã®äœçœ®ã®ç®åºã«åããååãªèœåãæäŸããŸããããããæšå®åšã¯ãDSPãåããååã«æ£ç¢ºãªã¢ãŒã¿ã®ã¢ãã«ã䜿ã£ãŠãªã¢ã«ã¿ã€ã ã«æŒç®ãè¡ãããšãåºç€ã«ããŠããŸããäžè¬ã«ãããããã»ã³ãµãŒã¬ã¹ã®ã¢ã«ãŽãªãºã ã¯ãäžéããé«éã®å転é床ã«å¯ŸããŠã¯ãã»ã³ãµãŒãããŒã¹ãšããã¢ã«ãŽãªãºã ãšåçã®æ§èœãçºæ®ããŸããããããã¢ãŒã¿ã®é床ãäœäžãããšãé»å§ïŒé»æµã®æž¬å®å€ããé床ã«åºã¥ããä¿¡é Œæ§ã®é«ãæ å ±ãæœåºããããšãé£ãããªããŸããäžè¬ã«ãã»ã³ãµãŒã¬ã¹ã®ã¢ãŒã¿å¶åŸ¡ã¯ãã³ã³ãã¬ããµããã¡ã³ããã³ããªã©ãé床ããŒãã§ç¶æãããããäœéã§ã®é£ç¶åäœãæ±ãããããããããšã®ãªãã¢ããªã±ãŒã·ã§ã³ã«é©çšããããšãã§ããŸãã
ãŸãšã
DSPãããŒã¹ãšããŠ3çžACã¢ãŒã¿ãå¶åŸ¡ããææ³ã¯åºã䜿ãããŠããŸããæ¢åã®ç£æ¥çšãªãŒãã¡ãŒã·ã§ã³ã®åžå Žã§ããå®¶é»ããªãã£ã¹ã»ãªãŒãã¡ãŒã·ã§ã³ãè»èŒã·ã¹ãã ãšãã£ãæ°èåžå Žã§ããããããææ³ãçšããããŠããŸããã¢ãŒã¿ãå¹ççãã€é«ãè²»çšå¯Ÿå¹æã§å¶åŸ¡ããã«ã¯ãããŒããŠã§ã¢ãšãœãããŠã§ã¢ã®ãã©ã³ã¹ãæé©åããããšãäžå¯æ¬ ã§ããäŸãã°ãPWMä¿¡å·ã®çºçåšãããŒã¿äœçœ®ã«å¯Ÿå¿ãããã©ã³ã¹ãã¥ãŒãµåãã®ãªã¢ã«ã¿ã€ã ã»ã€ã³ã¿ãŒãã§ãŒã¹ãªã©ãã¿ã€ãã³ã°ãéåžžã«éèŠãªéšåã«ã€ããŠã¯ãå°çšã®ããŒããŠã§ã¢ã»ãŠãããã§ç®¡çãããšããã§ããããäžæ¹ãå¶åŸ¡ã¢ã«ãŽãªãºã å šè¬ããããã¯ã¢ãŒã¿åãã«é»å§ã«é¢ããã³ãã³ããçæããããã®æŒç®ã¯ãDSPã³ã¢ã®é«éæŒç®ã«ãã£ãŠãœãããŠã§ã¢ã§åŠçããã¹ãã§ããå¶åŸ¡ãœãªã¥ãŒã·ã§ã³ã®äžã§ãœãããŠã§ã¢ãé©åã«æŽ»çšããããšã«ãããæ§æ¥ã®ããŒããŠã§ã¢ã»ããŒã¹ã®ãœãªã¥ãŒã·ã§ã³ãšæ¯ã¹ãŠã¢ããã°ã¬ãŒãã容æã«ãªããŸãããŸããåçŸæ§ãšä¿å®æ§ãé«ãŸããŸããããããããããã¡ãªããã享åã§ãããšããããšã§ããã¢ãŒã¿å¶åŸ¡ã®ãœãªã¥ãŒã·ã§ã³ã«ã¯ãã¢ãŒã¿ããã®ãã£ãŒãããã¯æ å ±ãé«éãã€æ£ç¢ºã«æž¬å®ããããã«ãé©åãªADCã·ã¹ãã ãçµã¿èŸŒãå¿ èŠããããŸãããŸããADCã·ã¹ãã ã«ã€ããŠã¯ãåè§£èœã倿é床ãå ¥åãµã³ããªã³ã°æ§é ã®é¢ã§ãç¹å®ã®ã¢ããªã±ãŒã·ã§ã³ã®èŠä»¶ã«å¯ŸããŠæé©ãªãã®ãéžæããªããã°ãªããŸããã