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The C12 is packed with revolutionary motor and control technology on several levels. Festool didn't just leap forward in one area of this drill; they made huge leaps forward in ALL areas of this drill. From the motor, to the electronics, to the geartrain; this drill raised the bar just past the fingertips of the competition. EC-TEC® Motor Technology The heart of the C12 is the revolutionary EC-TEC brushless motor. This isn't just your run-of-the- mill motor. This is a permanent magnet, remotely commutated, 3-phase, AC motor. This is the same type of motor used as servo motors in robotic systems where high torque, high speed, and extreme durability are crucial. So just how unique is this motor? Well, if you mechanically turned the motor, it would generate a 3-phase, sinusoidal AC output; just like industrial diesel-electric generators do. (Do not attempt this.1) For years, the motor technology of cordless tools has not changed. The brushed DC motor has been the staple—albeit inefficient—motor for ages. The brushed motor is simple, compact, and inexpensive, but it suffers from inefficient use of limited battery power. The greatest weakness of the brushed motor is that the electricity to the motor's windings passes through an electrical connection that is constantly changing and moving. Every time you see the brushes spark inside of a brushed motor, it is a waste of energy that is not available for use by the motor. To circumvent the losses of the brushed motor, Festool incorporated a brushless DC motor2 into the new C12 drill. The electrical connections to the windings are permanent, and don't suffer from the inefficiencies of constantly connecting and disconnecting as the motor rotates. The brushless DC motor lasts longer, and requires no maintenance, as compared to the brushed motor. It is also smoother and quieter. Electronics There are some popular brand drills on the market that are known to destroy themselves under a normal, but heavy load. I know this first-hand because I "smoked" a couple drills during my investigation of drills (including the most expensive drill my local home center carried). A powerful drill is of little value if it is easily damaged. The C12 has an intelligent electronic controller that not only powers the motor, but more importantly, monitors its health. Unlike other drills on the market, the C12 won't let you destroy the drill (or the battery) no matter how hard you try. It took less that 30 seconds to destroy a $270, 18- volt drill, yet the 12-volt C12 handled the same 1 Never attempt to manually turn the output shaft of any Festool drill or connect this drill to the output shaft of another drill. The C12's output shaft has a mechanical lock for bit changing and cannot be rotated manually. 2 Even though this is a 3-phase, AC motor; it is the electronic industry's practice to refer to this as a brushless DC (BLDC) motor because the AC power signal is electronically created and controlled from a DC (battery) power source. load without causing damage. The C12 monitors the electrical power to the motor to ensure that the motor operates within safe parameters. However, make no mistake; the C12 was designed properly in the first place, so it won't overheat under normal use. The drills mentioned above were under-engineered so the manufacturer could claim higher performance than the drill is realistically capable of Power Control Virtually all drills on the market (including AC andDC motors) use a similar design for controlling thepower to the motor. The trigger switch contains a A small electronic circuit creates a pulsating signal for controlling theof the motor, and a mechanical switch controls the motor's direction (refer to How Variable Speed Controllers Work on page 5). All of the power to the motor passes through this small circuit, and what's more, passes through the mecontacts of the The C12 uses six high power amplifiers to control the power to the three phases of the motor. These are located on the main control board where theis ample room for a heatsink. The only concircuit inside the power trigger is a small, solidstate resistor Even the forward/reverse control of the C12 is solidstate. There are no moving parts or contacts to fail. It is a sensor that detects the position of rare earth magnet located on the push button. More importantly, the electrical power of themotor is not flowing through a set of s Battery Sizes Whether you're an occasional picture hanger, or a professional contractor, the C12 is flexible enouto meet everyone's needs. The C12 is available with three sizes of batteries tochoose from: 1. nd 3.0 Ah NiMH. The higher the amp-hour (Ah will last. Battery Protection There are two common wthat battery life gets shortened; over-charging, and over-discharging. The Cincludes an intebattery charger to prevent over charging. The microprocessor controllcharger rapidly chargesbattery, and when full charge is detected, th maintenance mode.2A common misconception with...