Patent application number | Description | Published |
20140035493 | MOTOR DRIVE DEVICE - A motor drive device inputs two detection signals from a rotation position sensor thereby to detect a rotation position, and controls a voltage to be applied to a motor according to the detected rotation position. The motor drive device has a control unit for outputting a first voltage in a first state in which the square sum of sampling values sampled from the two detection signals is a predetermined value, and outputting a second voltage in a second state in which the square sum is not the predetermined value. | 02-06-2014 |
20140167662 | Inverter Device - An inverter device that controls a motor using a signal from a position sensor for detecting a rotor rotational position of the motor includes an initial adjustment unit that outputs a phase of current for designating a motor rotational position by rotating the motor in a clockwise direction of the motor and a phase of current for designating the motor rotational position by rotating the motor in a counter-clockwise direction of the motor. | 06-19-2014 |
20140239861 | Inverter Apparatus - An objective of the present invention is to improve current detection accuracy and to reduce noise of carrier frequency. A motor apparatus and a motor drive apparatus calculate motor currents Iu, Iv, and Iw using a DC bus current detected value Idc of an inverter and control a magnitude and a phase of an applied voltage of a motor to drive the motor. A carrier adjuster decreases a carrier frequency Fc of the inverter if a motor output is relatively larger and that increases the carrier frequency Fc of the inverter if the motor output is relatively smaller. A pulse shift adjuster shifts an interphase waveform of a PWM pulse according to the carrier frequency Fc. | 08-28-2014 |
20140292238 | Power Conversion Device - A power conversion device includes a switching circuit with multiple series circuits having upper arm switching elements connected in series with lower arm switching elements, receives DC power to generate AC power for a permanent magnet motor; a control circuit that calculates a state of the switching elements based on input information for each control cycle, and generates a control signal for controlling switching elements according; and a driver circuit that generates a drive signal that renders the switching elements conductive or non-conductive on the basis of the control signal from the control circuit. The control circuit predicts a locus of a d-axial magnetic flux and a locus of a q-axial magnetic flux, and calculates the state of the switching elements so that the d-axial magnetic flux falls within a given d-axial magnetic flux fluctuation range, and the q-axial magnetic flux falls within a given q-axial magnetic flux fluctuation range. | 10-02-2014 |
20150303844 | INVERTER DEVICE - An inverter device includes a source current calculator and an inverter circuit, wherein: the source current calculator calculates an average value of the DC bus current Ical during a PWM cycle through arithmetic operation executed based upon instantaneous values of the DC bus current Idc of the inverter circuit; and the source current calculator provides an estimated value by designating the average current value Ical during the PWM cycle as an input source current Isrc during the PWM cycle. | 10-22-2015 |
20150311835 | MOTOR DRIVING SYSTEM - The disclosed invention provides a synchronous motor driving system that reduces vibration attributed to a temporal second-order component of radial electromagnetic force in a three-phase synchronous motor and controls a d-axis current and a q-axis current to reduce noise that is produced as a result of vibration resonating with a structure. A motor driving system of the present invention causes a predefined negative d-axis current to flow into a motor in which a q-axis current is less than or equal to a predefined current value and d-axis inductance and q-axis inductance match substantially. The motor driving system causes a predefined negative d-axis current to flow into a motor in which d-axis inductance and q-axis inductance differ and causes the negative d-axis current to increase with an increase in the q-axis current. | 10-29-2015 |
20160028342 | ELECTRIC MOTOR DRIVE DEVICE - An electric motor drive device which drives an electric motor includes switching elements which are respectively connected to output lines and correspond to upper and lower arms of respective phases, a control unit which controls the operations of the switching elements, a smoothing capacitor connected in parallel with series circuits of the upper and lower arms of the phases, and an abnormality detection unit. The abnormality detection unit detects a voltage value of a virtual neutral point as a value related to the state of insulation of each of the output lines and detects a ground fault of the output line, based on a tilt of a temporary change in the detected value. | 01-28-2016 |
20160094180 | Electric Motor Drive Control Device, Electrically Driven Power Steering Device, Electrically Driven Brake Device, and Electrically Driven Pump Device - An electric motor drive control device includes: an inverter circuit that converts DC power inputted via a DC bus to multiphase AC power and outputs the multiphase AC power to an electric motor; a current detector that detects a DC current flowing in the DC bus; a PWM generator that generates PWM signals and outputs the PWM signals to the inverter circuit; a current calculator that calculates a current value for each of phases to be flowed to the electric motor based upon a value of the DC current and the PWM signals; and a current controller that generates a command signal based upon the current value, and outputs the command signal to the PWM generator, wherein: if one of the phases of the AC power has become missing, the current calculator determines which phase is one that has become missing and calculates current values for other phases. | 03-31-2016 |