Patent ID: 7094184
Filing Date: 2006-08-22
Classification: A63B

Abstract:
1. A self-sourcing exercise bike with a linear digital control magnetic resistance braking apparatus, comprising: a LED control panel; a generator, which is a permanent magnetic three phases induction generator for generating power; a power converter, which is a switching power converter for converting the electric energy of the generator; a digital control system, which includes a rotating speed detection circuit coupled to the power output side of the permanent magnetic three phases induction generator for feeding back the rotation speed of the fly wheel, a resistance level transfer circuit coupled to the LED control panel for detecting the presetting resistance level, a driving control circuit for generating a square wave of resistance control, a micro process controller which is embedded a linear magnetic resistance braking control table for the user or rehabilitant to linearly adjust the resistance force or torque according to the speed of the exercise bike and the presetting resistance force, and a zero start-up magnetic resistance driving circuit connected to the driving control circuit for making the user or rehabilitant to easily start up the power system in the initial stage; and a magnetic braking resistance, which includes a changeable inductance electromagnet composed of a Ferrite core, a changeable inductance magnetic resistance coil and dc bias voltage coil, and a discharge load for providing a discharge load for the changeable inductance, wherein a pulsating current is used to control the magnetic field of the electromagnet to increase the torque.