C182 INSTRUCTOR TWICE PENETRATES PHX CLASS B WHEN TRAINING. FIRST TIME ERROR RECOGNIZED BY PLT; SECOND BY CTLR.

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ON THE FIRST DAY OF INST FLT INSTRUCTION IN THE PHOENIX CLASS B AREA (AN AREA NEW TO ME); I BECAME AWARE THAT I WAS 1500 FT ABOVE THE FLOOR OF A 5000 FT MSL SECTOR OF THE PHX BRAVO AREA. I HAD MY STUDENT EXECUTE AN IMMEDIATE DSNDING TURN AWAY FROM THE BRAVO. TOTAL TIME IN AIRSPACE DURING THE VIOLATION WAS LESS THAN 2 MINS. ON THE SECOND DAY OF INST FLT INSTRUCTION; I VIOLATED THE CLASS BRAVO AGAIN! DIFFERENT AREA THIS TIME: BTWN AVENT INTXN AND FFZ. I WAS CONDUCTING AN ERSATZ 'OWN NAV' NDB APCH INTO FFZ AFTER BEING TOLD BY PHX APCH THAT IT WOULD BE A 30 MIN WAIT FOR THEM TO GET TO US. I INSTRUCTED MY STUDENT TO DSND TO 3500 FT MSL; BELIEVING THIS ALT WOULD KEEP US CLR OF THE 6000 FT AND 4000 FT MSL C-SECTORS OF THE CLASS BRAVO WE WOULD BE FLYING THROUGH TO FFZ. 10 MI OUT FROM FFZ; I CONTACTED TWR TO ADVISE THEM THAT WE WERE PRACTICING THE NDB APCH; OWN NAV; IN VFR CONDITIONS. TWR TOLD US TO RPT TOXIE; THE FAF. ONCE PAST LYNET (7.1 NM FROM THE FIELD); TWR ADVISED US TO REMAIN CLR OF THE CLASS BRAVO AIRSPACE. AT THIS POINT; I REALIZED THAT I WAS ; ONCE AGAIN 500 FT ABOVE THE FLOOR OF THE AIRSPACE. IN MY RUSH TO COBBLE TOGETHER THIS PRACTICE APCH; I FAILED TO NOTICE THAT THE APCH COURSE TOOK US ACROSS A SMALL CORNER OF THE CLASS BRAVO AIRSPACE WITH A 3000 FT MSL FLOOR. I THANKED FFZ TWR FOR THE ADVISORY AND IMMEDIATELY DSNDED BELOW 3000 FT. NEITHER AIRSPACE VIOLATION WAS INTENTIONAL OR TAKEN LIGHTLY BY ME. CONTRIBUTING FACTORS IN BOTH INSTANCES WERE THE RESULT OF AN INSTRUCTOR NEW TO AN AREA; CONDUCTING ACCELERATED INST FLT TRAINING TO A NEW STUDENT; WITHOUT PROPERLY AND FULLY STUDYING THE CLASS B STRUCTURE AS IT RELATED TO THE MANY SATELLITE ARPTS THAT LAY BENEATH THE FLOOR OF THE PHOENIX CLASS BRAVO AIRSPACE.