Abstract:
A pulse hub motor having coils (101) and magnets (107) interacting three dimensionally in x, y, and z axes to facilitate both increased power and efficiency through the ability to have more coils (101) in the motor, have each coil (101) perform both push and pull functions, and yet have the flexibility to only use the amount of coils (101) needed for real-time power requirements, whilst regenerating power in both normal drive and braking modes.
Abstract:
A braking system for waterborne propeller driven vessel which, upon activating a brake pedal or similar actuation device causes the vessel to almost immediately stop its forward movement. The system initiates a burst of highly amplified horsepower and torque, created by a controlled pulse of electrical power released from a bank of fully charged ultracapacitors. This pulse of electrical power is sent directly to AC induction-driven motors, causing oversized propellers to immediately rotate astern, thereby generating a reverse thrust in opposition to the vessel's forward movement sufficient to stop the vessel. The horsepower and torque produced by the braking system and operation of the present invention will also cause the oversize propellers to transmit this tremendous power into the water, without cavitation, to assist in stopping vessel movement.
Abstract:
A control device for the vibration generation device includes the vibration generation device including a stator, and a rotor provided so as to be able to rotate around a predetermined axis with respect to the stator, and having a weight having a gravity center at a position shifted from the predetermined axis, and a control section adapted to control a start-up period maximum voltage value, which is a maximum voltage value of a drive signal to be applied to the vibration generation device in a start-up period, to become larger than a steady operation period voltage value, which is a voltage value of the drive signal to be applied to the vibration generation device in a steady operation period.
Abstract:
A fan system comprising a motor, a motor driving circuit and a control unit is disclosed. The motor driving circuit is coupled to the motor. The control unit is coupled to the motor driving circuit, generates a forward rotation command for controlling the motor to rotate in a predetermined direction when the control unit receives electrical power, and generates a backward rotation command for controlling the motor to rotate in a direction opposite to the predetermined direction when the control unit fails to receive the electrical power.
Abstract:
A vehicle electronic controller comprises a load such as electric motor or one or more solenoids each connected in series to a power supply; a load state detection sensor for detecting the state of the load; a required minimum drive voltage calculation microprocessor for calculating a required minimum drive voltage which is a drive voltage to be supplied to the load and which is a required lowest voltage, based on the state of the load detected by the load state detection sensor; and a power supply relay circuit arranged between the power supply and the load for transforming a power voltage supplied from the power supply into the required minimum drive voltage calculated by the required minimum drive voltage calculation microprocessor to supply the transformed voltage as the drive voltage to the load.
Abstract:
A braking circuit for a universal motor is proposed, in which, during braking, the at least one field winding is connected in series with the armature by means of a semi-conductor switch, preferably a field effect transistor or a thyristor. Since the semiconductor switch can also be switched intermittently and with a time delay, not only is it possible to regulate the braking current simply, but there is also a reduced formation of sparks at the collector. The reduction in the contact erosion lengthens the service life and increases the reliability of the motor.
Abstract:
A method and circuit for braking a forward rotation of a rotor of a polyphase DC motor. A commutation sequencer is incremented by several phases to produce an incremented commutation sequence to produce a magnetic flux vector that lags a magnetic pole of the motor. Driving currents are applied to coils of the motor in accordance with the incremented commutation sequence to brake the rotor. The method is implemented in a circuit that has a sequencer for incrementally generating sets of commutation signals to select stator coils for energization to rotate the rotor. A power stage to which the commutation signals are applied energizes the selected coils in accordance with the commutation signals. A circuit interrupts the energization of the selected coils and the commutation sequence is altered to produce a sequence that produces a negative torque on the rotor. Circuits are also provided to inhibit application of the altered commutation sequence until recirculation currents in the power stage caused by the coils in response to the reduction of the input voltage have fallen below a predetermined level, and to inhibit application of the altered commutation sequence until a voltage on a sense resistor between the power stage and a reference potential has fallen below a predetermined level after an operation of the circuit for interrupting the energization of the selected coils.
Abstract:
An electric vehicle drive train includes a controller for detecting and compensating for vehicle rollback, as when the vehicle is started upward on an incline. The vehicle includes an electric motor rotatable in opposite directions corresponding to opposite directions of vehicle movement. A gear selector permits the driver to select an intended or desired direction of vehicle movement. If a speed and rotational sensor associated with the motor indicates vehicle movement opposite to the intended direction of vehicle movement, the motor is driven to a torque output magnitude as a nonconstant function of the rollback speed to counteract the vehicle rollback. The torque function may be either a linear function of speed or a function of the speed squared.
Abstract:
A method of controlling the driving of a conveyor in an automatic document conveying device in which the conveyor is positioned opposite a transparent plate in an image processing machine and a reversibly rotatable electric motor for driving the conveyor. In the automatic document conveying device, a sheet-like document fed between the transparent plate and the conveyor is conveyed in a predetermined direction on the transparent plate by applying a normally rotating voltage to the electric motor to rotate the electric motor in a normal direction and drive the conveyor in a predetermined direction. Thereafter, the document is stopped at a required site on the transparent plate by producing a braking action in the electric motor and thus stopping the conveyor. The conveying speed of the conveyor is detected as the conveyor is driven in the predetermined direction is detected. According to the detected conveying speed, the time at which the braking action is produced in the electric motor, and/or at least one of a time at which the application of the normally rotating voltage to the electric motor is stopped and the time at which the braking action is produced in the electric motor is controlled. The braking action is produced by applying a second voltage to the electric motor after the lapse of some time following the stopping of applying of the normally rotating voltage to the electric motor.
Abstract:
A braking method for DC motor of the present invention is applied to a pulse-driven DC motor. A counter electromotive force of reverse polarity to driving pulses which is generated by induction at the winding of the DC motor is charged in a capacitor. The charged counter electromotive force is fed to the winding of the DC motor during the time that the driving pulses are not fed to the motor, so that plugging is applied to the DC motor. Thus, an external power source for plugging is not necessary, and power consumption is reduced and the construction of the braking circuit becomes very simple. Also, the driving period and the plugging period have a complementary relationship therebetween, thereby enabling the accurate controlling of the rotational speed of the DC motor with a very simple circuit.