Abstract: A method for controlling a rotary electrical machine and a control and power module for a rotary electrical machine. The rotary electrical machine includes a plurality of phase windings (9), a power circuit (12, 16) which comprises a plurality of arms each formed by a bridge of switches and which is capable of supplying an electrical network at an output voltage (Vres) equal to a nominal voltage when the bridge of switches is in a nominal mode of operation, an excitation winding (11) through which flows an excitation current (I exc) which generates a magnetic flux in a magnetic excitation circuit (10), and an electronic control circuit (7) which operates the power circuit and controls the excitation current. The method includes locking the bridge in at least one arm of the power circuit in a conductive state when the output voltage exceeds a voltage threshold higher than the nominal voltage. The nominal mode of operation of the bridge is returned to independently of the output voltage.

Abstract: The present invention includes a control device capable of applying a high voltage to a motor of a fuel pump for an appropriate period of time during a low voltage operation of the motor.

Abstract: A method and a circuit for controlling an ac machine comprises controlling a full bridge network of commutation switches which are connected between a multiphase voltage source and the phase windings to switch the phase windings between a parallel connection and a series connection while providing commutation discharge paths for electrical current resulting from inductance in the phase windings. This provides extra torque for starting a vehicle from lower battery current.

Abstract: An anti-regeneration circuit for preventing a regenerated current produced by an overhauling DC motor from setting a series brake. The anti-regeneration circuit includes a current blocking device 90 which blocks the flow of regenerated current in the crane control circuit 10 and a surge suppresser 94 for protecting the current blocking device 90 from a high inverse peak voltage produced by de-excitation of a crane control circuit 10 upon the sudden loss of power.

Abstract: Direct current (DC) solid state series wound motor drives for hoist and crane applications. A microprocessor controlled electronic system is employed to control the speed, direction, acceleration and deceleration of a direct current DC solid state series wound motor drive for a hoist or a crane (bridge or trolley). The operation can be via an operator, radio remote, or computer communication link. The system requires a speed and direction command from the operator controls; it then configures the motor and varies the speed while offering certain protection circuits. The DC series wound motor drive includes a DC series wound motor comprising an armature and a series wound field that is supplied with DC voltage power from an external source. The DC voltage power supply can either be generated DC or rectified alternating current (AC). High speed insulated gate bipolar transistor (IGBT) switching elements are provided.

Abstract: A DC shunt or compound motor, in which an armature current detection device, provided to increase the current in the shunt field winding following an increase in armature load current, causes the motor to have characteristics similar to a series motor until a maximum setting value is reached, at which time the speed is held constant with increasing torque as is characteristic of a shunt-type motor. Below a minimum speed, the torque also increases as in a conventional shunt-type motor.

Abstract: A method of controlling and a controller for controlling at least one series motor is provided. Rectifier means is connected in series with the motor so that current through a field winding of the motor is always in the same direction irrespective of the polarity of the input voltage while the current direction through an armature of the motor reverses in accordance with the polarity of the input voltage. An energizing current is applied to the field winding by a bias power supply to ensure that the field winding always produces some flux during operation of the motor.

Abstract: Method and apparatus for the operation of a direct current (d.c.) motor requiring no start-up resistor and accompanying switches. Regenerative braking is obtained and the torque interference in the operation is carried over to the electrical input after being dampened, due to the "soft" speed/torque characteristic. The d.c. motor is directly controlled by a technique which stimulates either the characteristics of a shunt-wound motor or a series-wound motor. A command signal is provided by an adjustable signal source which is adjusted in accordance with the armature current desired. A d.c. voltage source is controlled to provide an armature current in accordance with the command signal. When the armature voltage reaches its nominal value, a controlled d.c. current source is regulated in accordance with an error signal which is the difference between the command signal and the armature current, to regulate the excitation.

Abstract: A universal series motor having its brushes shifted at an angle against the direction of rotation is provided with a braking arrangement which removes power from the field windings and applies power directly to the armature winding.

Abstract: In an electric car, wherein the powering drive and the braking drive are executed by on-off controlling a current through a d. c. motor by means of a chopper, when the electric car is below a predetermined speed, a field coil of the d. c. motor is put into a series winding connection so as to carry out full field control, and when the car is above the predetermined speed, the field coil of the d. c. motor is changed-over to a shunt winding connection so as to carry out weak field control.The duty cycle of the chopper is controlled with the running state of the electric car taken into consideration in order that the field current at the time when the series winding connection has been changed-over to the shunt winding connection may become substantially equal to a value before the change-over, whereby the transient change of the current between before and after the change-over of the field coil is suppressed.

Abstract: A control circuit controls AC energization of a universal, series wound AC motor in a circuit breaker motor operator to power a breaker charging cycle. At the end of a charging cycle, the motor field winding remains energized from the AC source, however a braking resistor is switched across the de-energized motor armature to achieve dynamic braking. A timing circuit operates in the dual capacity of controlling dynamic motor braking and preventing continued running of the motor operator should the breaker operating mechanism fail to reset during a charging cycle.