US 4,496,898 A · Vehicle A.C. generator with constant output power

Abstract

An alternating current (AC) generator of the type used in vehicular applications and driven by the vehicle engine has a stator winding and a field winding wherein the electrical resistance of the field winding varies as a function of temperature. An exciting current intermittently is allowed to flow through the field winding which induces a current in the stator winding. The output of the stator is rectified and used to charge the vehicle battery. The invention comprises inclusion of field winding current compensation apparatus which varies as a function of temperature to reduce undesired field winding current variations due to temperature which results in improvements of power output and stabilized generator driving torque.

Claims2

Dependent claims

An AC generator for a vehicle, comprising;

a field winding having a temperature dependent resistance, a stator winding, said stator and field winding being provided for generating AC power, a rectifying apparatus for rectifying said AC power, a voltage control apparatus for interrupting an exciting current flowing into said field winding, and a constant current source further comprising a switching device connected in series with said field winding, a control device which outputs a control signal having a signal level proportional to the magnitude of said field winding current, and a second switching means which is activated in response to said control signal and in accordance with the signal level of said control signal for controlling the conductivity of said first switching means.

Dependencies are inferred from the claim text.

Vehicle A.C. generator with constant output power

Life of this patent

Vehicle A.C. generator with constant output power

Life of this patent

Abstract

Claims2