Patent application number | Description | Published |
20080211450 | ROTATING MACHINERY CONTROLLER - A rotating machinery includes a first control member for performing rectangular wave control by operating the switching devices of an inverter such that an on-state and an off-state occur once for one cycle period in electrical angle of a motor, a second control member for operating the switching devices on the basis of a magnitude relation between upper and lower limits of a predetermined hysteresis region and an actual current flowing through the motor, and a switching member for, when the actual current deviates from the hysteresis region while the rectangular wave control is undertaken, switching the control to an instantaneous current value control performed by the second control member. | 09-04-2008 |
20090160376 | CONTROL SYSTEM FOR MULTIPHASE ROTARY MACHINES - In a control system designed to use a plurality of voltage vectors expressing a switching mode for a switching circuit to thereby control a difference between a current actually flowing through a multiphase rotary machine and a command current value therefor within an allowable range, a calculating unit calculates a direction of change in the difference during the switching mode for the switching circuit being set to a zero vector. A zero-vector setting unit sets the switching mode for the switching circuit to the zero vector when a preset positional condition between the difference and the direction of change in the difference is met in a space. | 06-25-2009 |
20090160377 | CONTROL SYSTEM FOR MULTIPHASE ROTARY MACHINES - A control system is designed to use a plurality of voltage vectors expressing a switching mode for a switching circuit to thereby control a difference between a current actually flowing through a multiphase rotary machine and a command current value therefor within an allowable range. The plurality of voltage vectors include a zero vector that allows line-to-line voltages in the multiphase rotary machine to be all zero, and a plurality of non-zero vectors that allow at least one of line-to-line voltage in the multiphase rotary machine to be nonzero. A drive unit is configured to switch only one phase of the switching element for each shift of the switching mode to thereby shift, in accordance with a preset switching pattern, the switching mode from a specified one of the plurality of non-zero vectors to the specified one of the plurality of non-zero vectors via the zero vector. | 06-25-2009 |
20090237021 | APPARATUS FOR CARRYING OUT IMPROVED CONTROL OF ROTARY MACHINE - In an apparatus, a norm setter sets, based on a request torque for a rotary machine and a rotational velocity of a rotor, a norm of a vector of an a output voltage in a two-phase rotating coordinate system defined in the rotor. A phase setter sets, based on a deviation between a generated torque and the request torque, a phase of the vector of the output voltage of the power converter in the two-phase rotating coordinate system. A drive signal determiner determines, based on the norm set by the norm setter and the phase set by the phase setter, a drive signal, and applies the drive signal to a switching member to thereby drive the switching member such that the generated torque is adjusted to the request torque. | 09-24-2009 |
20090237022 | APPARATUS FOR CARRYING OUT IMPROVED CONTROL OF ROTARY MACHINE - In an apparatus, a phase setter sets, based on a deviation between a generated torque and a request torque for a rotary machine, a phase of a vector of a variable output voltage of a power converter in a two-phase rotating coordinate system defined in a rotor of the rotary machine. A norm setter sets, based on the phase set by the phase setter and a rotational velocity of the rotor, a norm of the vector of the output voltage in the two-phase rotating coordinate system. A drive signal determiner determines, based on the phase set by the phase setter and the norm set by the norm setter, a drive signal, and applies the drive signal to the switching member to thereby drive the switching member such that the generated torque is adjusted to a request torque. | 09-24-2009 |
20100134053 | CONTROL DEVICE FOR ELECTRIC ROTATING MACHINE AND METHOD OF CONTROLLING THE MACHINE - A control device has a unit for preparing a pattern having first and second periods by comparing a triangular wave and a sine wave having an amplitude ratio set at each value of a modulation factor, and selecting one pattern corresponding to an instructed modulation factor, and a unit for applying a controlled voltage, set at low and high levels in response to first and second periods of the selected pattern, to a generator. The triangular wave has a cycle duration obtained by dividing the cycle duration of the generator by product of 3 and odd number, a crest having a level higher than the sine wave at a timing of each first period, and a trough having a level lower than the sine wave at a timing of each second period. | 06-03-2010 |
20110074849 | LIQUID DISCHARGE DEVICE - A liquid discharge device is provided with a printed circuit board. The printed circuit board is formed with a connection area where a plurality of connection terminals to be connected with a plurality of input terminals of a discharge head, and a pair of extending portions oppositely extending from the connection area, the pair of extending portions being bent with respect to the connection area to form a C-like cross section so that end portions of the pair of extending portions face each other. A plurality of positioning members configured to position the end portions of the pair of extending portions so that the end portions of the extending portions face each other, the plurality of positioning members being configured to be movable along the surface of the liquid discharge head with maintaining a positional relationship among the plurality of positioning members. | 03-31-2011 |
20110298403 | Apparatus for carrying out improved control of rotary machine - In an apparatus, a norm setter sets, based on a request torque for a rotary machine and a rotational velocity of a rotor, a norm of a vector of an output voltage in a two-phase rotating coordinate system defined in the rotor. A phase setter sets, based on a deviation between a generated torque and the request torque, a phase of the vector of the output voltage of the power converter in the two-phase rotating coordinate system. A drive signal determiner determines, based on the norm set by the norm setter and the phase set by the phase setter, a drive signal, and applies the drive signal to a switching member to thereby drive the switching member such that the generated torque is adjusted to the request torque. | 12-08-2011 |