摘要:
A fixed gain electromagnetic actuator for controlling the position of a body including at least two pair of a magnetically permeable pole spaced from the body, bias coils about each pole, separate control coils about each pole, a bias source for the bias coils providing a current in the bias coils producing a steady-state equal strength magnetic field on opposing sides of a body, and a control source for the control coils providing a current in the control coils for producing an increase in the magnetic field on one side of the body and a corresponding equivalent decrease in the magnetic field on the opposing side of the body to compensate for any external upsetting forces acting on the body.
摘要:
An energy storage attitude control and reference system for a craft including at least two flywheels with their angular momenta balanced to produce zero net angular momentum and at least two motor/generator units each including one of the flywheels in its rotor structure. The system further includes one pair of bearings for supporting each of the flywheels, means for measuring the position of each flywheel relative to its bearings, means for resolving current to and from said motor/generator units, means for applying torques to each flywheel through its respective bearings for controlling attitude of the craft about two mutually perpendicular axes, and means for exerting torques to each flywheel through its respective motor/generator to provide attitude control of the craft about a third axis perpendicular to the first two and for controlling the energy storage level of the flywheels.
摘要:
An inertial energy storage device including a synchronous rotary electrical machine for bidirectional conversion between mechanical and electrical energy including: a stator having two axially spaced sets of circumferentially spaced teeth; field excitation means disposed on the stator to provide an axially polarized magnetic field; stator windings including a plurality of coils, each of which surrounds at least one tooth from each set; and a rotor having a plurality of circumferentially spaced teeth facing the stator teeth, and a circumferential flywheel mass radially spaced from its rotational axis; and a motor control circuit including sensor means for sensing the position of the rotor relative to the stator; means, responsive to the sensor means, for generating a waveform for driving the machine when it is operating as a motor; a voltage control circuit for controlling the amplitude of the waveform for driving the machine; and a current control circuit for controlling amplitude of the current provided to the machine.
摘要:
A self-regulating energy storage system including: an a.c. motor/generator including a rotor; a flywheel attached to the motor/generator; a device for monitoring the position of the motor/generator rotor; an element for resolving current to and from the motor/generator; a pulse width modulated bidirectional inverter interconnecting the motor/generator with a power supply bus to be regulated; a summing circuit for determining differences between a reference voltage and the voltage in the power supply bus to be regulated; and a pulse width modulation switch control responsive to the comparator circuit, to the device for monitoring, and to the element for resolving, for actuating the inverter to increase pulse width as a function of increase in the difference between the reference voltage and the voltage on the bus, and to increase current to the motor/generator in the motor direction when the bus voltage exceeds the reference voltage and to increase current from the motor/generator in the generator direction when the reference voltage exceeds the bus voltage.
摘要:
A power conversion system for converting between electrical power at different frequencies, including a rotary electrical machine including a rotor, a stator, first and second independently controllable field windings, and at least one armature winding for each phase; a switching circuit including a plurality of switching devices and having first terminal means interconnected with the armature winding which carries a high frequency signal established by the machine, and a second terminal for interconnection with an impedance establishing a lower frequency signal; the first field control circuit for monitoring the machine to sense phase difference between the optimum zero crossings and actual zero crossings of the higher frequency signal for driving the first field winding to adjust the phase of the higher frequency signal to minimize the phase difference; a second field control circuit for modulating the higher frequency signal carried by the armature winding with the lower frequency signal and for monitoring the second terminal means to sense amplitude difference between a selected one of the voltage and current parameters of the lower frequency signal and a reference level for driving the second field winding to adjust that parameter towards the reference level; and a switch firing circuit responsive to the machine voltage and one of the voltage and current parameters of the lower frequency signal at the second terminal means for selectively triggering to the on state and self-commutating to the off state the switching devices synchronously with the zero crossings of the higher frequency signal for transferring power between the higher and lower frequency signals through the switching circuit.