Abstract: A system includes a gas turbine engine, a generator coupled with the gas turbine engine, and controller circuitry. The generator may be rotatable by the gas turbine engine to generate electric power on a load bus. The controller circuitry may control the load bus to manage an output torque of the gas turbine engine in accordance with a load demand present on the generator. The controller circuitry may dynamically alternate supply of electric power from the load bus to a first load and a second load to maintain operational transient parameters of the gas turbine engine within a predetermined range.

Abstract: A controller is provided to drive an inverter circuit for a PMSM. The inverter circuit is connected to a battery through a DC link capacitor, and is driven in one safe state during a fault condition. The controller monitors at least one parameter with respective threshold value to drive the inverter circuit in one safe state comprising an active Short Circuit (SC) and a Freewheel (FW). While in FW state, the controller switches from the FW state to the SC state if the at least one parameter is above the respective threshold. While in SC state, the controller controls engine speed to bring the PMSM to a predetermined speed when the stator temperature is more than a threshold temperature value. The controller switches from the SC state to the FW state.

Abstract: A control device performs voltage conversion control on a voltage conversion circuit between a power supply and motor control circuits which control a plurality of motors. The control device includes sampling units for sampling a DC voltage after voltage conversion, target voltage setting units for setting target voltages VHT1 and VHT2 of the plurality of motors, selection unit for selecting a target voltage VHT to be converted by the voltage conversion circuit from a plurality of target voltages VHT1 and VHT2, generating unit for generating a sampling timing TS on the basis of a gate signal GS1 or GS2 of one of the motors with the target voltage which has not been selected, and control unit for performing the voltage conversion control using the DC voltage sampled by the sampling units at the sampling timing TS in response to each sampling timing request DS in the voltage conversion control.

Abstract: A method for providing electrical energy to an actuator is disclosed. In at least one embodiment, the method includes having a first voltage (UBUS) from a data bus; ii) converting the electric current to a current having a second voltage that is higher than the first voltage; iii) storing electrical energy of the second electric current; and discharging the stored electrical energy to an actuator. A device is also disclosed for providing electrical energy to an actuator.

Abstract: A power accumulating unit of a power supply system includes a first switch section configured to achieve a first voltage output state in which an output voltage is substantially equal to a first motor driving voltage and a second switch section configured to achieve a second voltage output state in which the output voltage is substantially equal to a second motor driving voltage that is higher than the first motor driving voltage. A voltage switching control part is configured to perform a voltage switching control to switch between the first motor driving voltage and the second motor driving voltage by alternately operating the first and second switch sections to repeatedly switch between the first voltage output state and the second voltage output state.

Abstract: Methods and apparatus provide for: commutating windings of a polyphase machine such that electromagnetic fields of stator and rotor phases of the polyphase machine produce at least one of motoring and generating torque; providing a first rotor excitation voltage having substantially no DC component when a rotational speed of the polyphase machine is below a predetermined value; and providing a second rotor excitation voltage having a DC component when the rotational speed of the polyphase machine is above the predetermined value.

Abstract: A driving circuit of a DC motor includes a control circuit for providing a control signal, and a motor drive circuit commanded by the control circuit for providing respective command signals for the switches of an output power stage connected to the DC motor. The output power stage is connected to a power supply line and drives the windings of the DC motor. The driving circuit prevents generation of voltage surges having a significant magnitude on the power supply line because the driving circuit has logic circuits for preventing any substantial inversion in the direction of current flow in the supply lines when the DC motor operates as a current generator.

Abstract: A fan motor includes a rotor coil and a stator coil. The stator coil has its starting coil or rotating coil provided with an auto-coupling tapped coil or a third coil to make up a secondary coil of the starting coil or the rotating coil. The tapped coil or the secondary coil is coupled to produce a voltage value to be supplies as power for a DC motor for the swinging head of an electric fan, or power for a stabilized and rectified circuit, able to economize producing cost and supply the fan motor with a large current.

Abstract: An apparatus and method of powering a light source are provided. The apparatus includes a motor, a voltage stabilizing circuit, and a light source. The motor includes a field assembly and an armature assembly. The field assembly includes an intermediate tap on a field winding that forms a variable field winding power source. The stabilizing circuit connects to the intermediate tap and includes a voltage regulator having an output that is connected to a light source to be stabilized.

Abstract: The series field winding of a compound or series motor includes a plurality of taps and, connected in parallel therewith, a transient storage element such as a capacitor, and a flywheel diode. The taps are controlled by switches in the form of transistors or thyristors which are turned on and off by a central control unit in response to setting of the speed and, optionally, various feedback devices such as a motor speed detector, an armature EMF detector, or a load current detector. The transient storage device replaces conventional linear impedance or linear power elements in order to prevent loss of power as the armature voltage is increased.

Abstract: The present invention relates to a DC control circuit for a main motor-generator set, in which a main motor includes an auxiliary shunt field winding. The control circuit includes a current follower motor that is driven by the armature current of the main motor and which drives an auxiliary generator to constitute a feedback unit. Electric energy produced by the auxiliary generator is applied to the auxiliary field of the main motor-generator set. The auxiliary field of the main motor-generator set may be excited with the same polarity as the main motor-generator set field winding to increase the field as the main motor-generator armature current increases, or with opposite polarity to reduce the field in response to main motor-generator current increasing. A control interface controls output voltage or output impedance from the auxiliary generator and selects a type magnetizing of aforesaid auxiliary field of the main motor-generator set.

Abstract: In a method and an apparatus for controlling a motor, one type or a plurality of types of weakening current are previously set, a first torque command current determined from a speed deviation between a speed command to the motor and the present speed of the motor is compared with torque currents corresponding the torques, so that a second torque command current and a weakening current are determined and outputted depending on which range of the torque currents corresponding the torques the first torque command current falls upon. Thus, the second torque command current and the weakening current can be determined simply and efficiently.

Abstract: Sub-excitation of a series-type excitation magnetic field winding for a DC motor or generator is provided by an auxiliary power supply which, when the voltage in the main circuit is low, supplies voltage through a diode to the main series field winding in order to keep the voltage at or near saturation and thereby improve motor efficiency.

Abstract: A motor control circuit includes a series motor made up of a series field winding serially connected with an armature or a compound motor having both a series field winding and a shunt field winding. The series field winding is parallel connected to an auxiliary power supply and connected to the main motor driving power source via a switch which connects the series winding in series therewith during start-up or an overload condition and in parallel therewith during normal operation.

Abstract: A compound series motor includes a series field winding, armature, and auxiliary power supply connected in parallel with the series winding. The drop in armature current through the series field winding may be reduced by connecting an auxiliary field winding having the same polarity as the series field winding between the auxiliary power supply and the main power supply connection to the series field winding so as to prevent an excessive rise in running speed during idle load conditions, while a diode may be connected between the auxiliary power supply and the series field winding connection to the armature to prevent armature current losses. The power supply can be operated to supply continuous excitation current to the series field winding, or be controlled relative to the input voltage, the loading current value, or both the voltage and loading current values to provide an assist-type supplemental excitation current to the series field winding.

Abstract: Dynamic current feedback for a main motor-generator is provided by an auxiliary generator which supplies power directly to the main excitation field winding of the main motor-generator, rather than to an auxiliary shunt field winding as in a prior design, the main auxiliary generator in turn being driven by a current-follower type DC motor whose speed depends on the amount of current passing through the main motor-generator armature or the voltage drop across the main motor-generator series winding in the case of a series or compound main motor-generator. The current supplied by the auxiliary generator to the main excitation field winding of the main motor-generator can have either the same polarity as the main excitation field winding of the main motor-generator, or an inverse polarity, to provide positive or negative feedback.

Abstract: A field-controlled direct current motor is provided with a circuit responsive to armature current which is adjustable as to the amount of armature current representative signal, and the adjusted current representative signal is used to provide a selected amount of droop in the speed-load characteristic of the motor. A plurality of individually field-controlled direct current motors operating in parallel on a common load are individually adjusted as to the amount of sensed armature current to provide through field control individual selected amounts of droop in the respective speed-load characteristics.