Abstract: A system is provided for controlling a DC motor which is constructed to propel a golf car. The motor is a shunt wound motor having independently excited armature and field windings. The basic input to the armature of the motor is supplied through a pulse modulated chopper circuit which varies the width of the pulse in response to the throttle of the golf car. Full control of the input to the field winding is gained by the supply of power to an H bridge circuit. Armature current is continuously sensed to provide an indication of the status and performance of the car during operation. At a predetermined level of armature current the field current is adjusted to provide a higher torque at a specific speed. When armature current indicates a predetermined overspeed condition, field current is adjusted to enhance regeneration and the resultant braking. In addition, the stopped condition is continuously monitored.

Abstract: A single phase motor is disclosed which comprises a stator assembly having a main winding, a start winding and an auxiliary winding wherein the start and auxiliary windings are connected in two alternative configurations during start and run conditions, respectively. During the start condition, the start and auxiliary windings are interconnected by a series connection which causes current to flow through the auxiliary winding in a reverse direction to the flow through the start winding so that there exists a bucking magnetic relationship between the fields in the start and auxiliary windings. During the run condition of the motor, however, the start and auxiliary windings are interconnected by a second series electrical connection which causes the current to flow through the auxiliary winding in a direction opposite the first direction so as to cause the magnetic fields in the start and auxiliary windings to be in an aiding relationship thereby improving motor operating efficiency.

Abstract: A dynamoelectric machine having a low A ratio during its starting mode and a high A ratio during its running mode. During the starting mode of the dynamoelectric machine, an auxiliary winding serially connected in bucking relation with a phase winding is excited therewith across a main winding. Generally as the dynamoelectric machine is energized to a predetermined speed indicative of the occurrence of its running mode, the phase winding and the bucking auxiliary winding are electrically disassociated, and another auxiliary winding serially connected and arranged in additive relation with the phase winding is excited therewith across the main winding.A method of operating a dynamoelectric machine and a circuit are also disclosed.