Analog Three Phase Self Excited Brushless Direct Current Motor

摘要

A brushless direct current three-phase motor that is self driven and therefore does not require externally generated waveforms for its operation. The circuit connected to the motor is analog and reduces the complexity and present cost of the driver circuitry. There is no electronic commutation of the currents in the stator coils as is the case with other brushless motors.

主权项

1. An analog three phase brushless self excited direct current motor having at least four permanent magnets rigidly affixed to a circular rotor plate, the rotor plate having a shaft rigidly attached to its center so that the shaft is perpendicular to plane of the plate, the magnets being arranged on the rotor plate so that diametrically oppositely positioned magnets have the same magnetic polarity on one pair of magnets and have the opposite polarity on the other pair of diametrically opposite poles, the magnets being attached to the rotor plate so that they are close to the periphery of the rotor plate and each magnet is itself attached so that one of its poles is facing the rotor plate and the other faces open space, the magnetic poles facing the rotor plate also face the poles of at least six stator poles made of soft iron laminates that are rigidly attached to a motor end plate and have a coil of copper wire wound around each one; said stator poles being energized at appropriate times by passing through the coils, an electric current that is switched on and off by three Hall Effect sensors that are rigidly affixed to the other end plate of the motor at one hundred and twenty degree spacing; said Hall Effect sensors being used to send signals that reveal the instantaneous angular positions of the magnets to an analog electronic control unit as the rotor rotates about the shaft affixed to is center and is passing through bearings embedded in both end plates of the motor.