welcome back to war! Again, roberring! smile emoticon
look : " the device needs to have a motor with the magnets on the rotor. Most DC motors have the magnets on the stator and brushes to create an AC current through the coils on the rotor. The rotor does not have a magnetic field alone and thus the external ring magnet has nothing to influence.
look : " the device needs to have a motor with the magnets on the rotor. Most DC motors have the magnets on the stator and brushes to create an AC current through the coils on the rotor. The rotor does not have a magnetic field alone and thus the external ring magnet has nothing to influence.
A brushless DC motors with the coils on the stator needs special inverter circuitry to create an alternating magnetic field around the magnets on the rotor. I doubt many manufacturers would introduce more complexity and cost for no apparent reason.
In scenario 2, even if there is a coil in the circuit of the motor, you still need a closed circuit. The motor will be driven either by a diode-clamped power transistor, or a relay switch. When the transistor is saturated, it will not conduct current, hence the whole field of semiconductors. And obviously, if the relay is open, the circuit is open.
...use electromagnets, they can generate a far stronger magnetic field in the same size and weight (if the batteries are not included), and don't require drills to rotate them, because it is far easier to make the field rotate instead."
two questions: this does not activate the thremal sensor? and the relock internal alarm?
another question : do they have a software detector " ... an end switch that they monitor, and they power up the motor if the end switch contact is broken" ? ....probably not, because of energy blackouts right?
