Abstract: A motor controller estimates an initial position of a magnetic pole of a rotor of a brushless DC motor in an inductive sensing scheme. The motor controller controls a drive circuit to apply an AC voltage to a stator winding at a first energization angle, and subsequently to apply an AC voltage to the stator winding at a second energization angle before a residual current flowing through the stator winding returns to zero. At each energization angle, the motor controller corrects a peak value of a current in the stator winding based on the residual current detected immediately before a voltage is applied to the stator winding or at a time when voltage application to the stator winding is started. Based on the corrected peak value, the control circuit estimates the initial position of the magnetic pole of the rotor.

Abstract: A motor controller includes: a velocity calculation unit for obtaining an angle ?(n), which shows a rotation position, and an angular velocity ?(n) of a rotor at a time point n; a compensation amount calculation unit for calculating a compensation angle ?? by which the rotor advances from the time point n to a (n+1)th control cycle (a control cycle starting from a time point n+1), based on an angular acceleration a(n) of the rotor, an angular velocity ?(n) of the rotor at the time point n and a time length T of the control cycle; and a PWM inverter for controlling a voltage to be applied to a coil such that a rotating magnetic field based on a rotation position of the rotor advanced by the compensation angle ?? from the rotation position of the rotor at the time point n is formed in the (n+1)th control cycle.

Abstract: A control device of a permanent magnet synchronous motor that is a control device of a sensorless-type permanent magnet synchronous motor in which a rotor using a permanent magnet rotates by a rotating magnetic field caused by a current flowing in an armature includes: a driver that applies a voltage to the armature and drives the rotor; an initial position estimator that estimates an initial position which is a magnetic pole position of the rotor that is stopped; and a controller that controls the driver so as to apply a pulse train including a voltage pulse for searching the initial position for each of n angle positions dividing a search range of an electrical angle of 360 degrees to the armature, wherein the pulse train includes a first pulse and a second pulse.

Abstract: A controller for a sensorless permanent magnet synchronous motor having a rotor using a permanent magnet, the rotor rotating by a rotating magnetic field caused by a current flowing through an armature is provided. The controller is configured to apply a pulse voltage for generating a magnetic field vector for searching for the initial position to each of search sections obtained by dividing a target range, narrow down a target range in such a manner that a search section in which a largest amount of current flows through the armature by application of the pulse voltage is selected as a subsequent target range, and repeat the application processing and the narrow-down processing to estimate the initial position.

Abstract: A method for controlling a permanent magnet synchronous motor having a rotor using a permanent magnet, the rotor rotating by a rotating magnetic field caused by a current flowing through an armature is provided. The method includes: presuming, based on a target speed and an estimated speed that is an estimated value of a rotational speed of the rotor, whether or not a step-out occurs; correcting, when it is presumed that a step-out occurs, an estimated angle that is an estimated value of a position of magnetic poles of the rotor; and controlling, based on a post-correction estimated angle that is the estimated angle after the correction, a current flowing through the armature to cause the rotating magnetic field rotating at the target speed.

Abstract: There is provided an electric wire holder for holding electric wires connected to terminal fittings at end portions of the wires, the holder configured to attach to a shielding pipe to cover an edge of the shielding pipe into which the electric wires are inserted and from which the terminal fittings and a portion of the electric wires are drawn out to an outside of the shielding pipe, the holder comprising: a first holding piece configured to hold the portion of the electric wires that is drawn out from the shielding pipe and to fix a draw-out position of the terminal fittings.

Abstract: A motor controller includes: a velocity calculation unit for obtaining an angle ?(n), which shows a rotation position, and an angular velocity ?(n) of a rotor at a time point n; a compensation amount calculation unit for calculating a compensation angle ?? by which the rotor advances from the time point n to a (n+1)th control cycle (a control cycle starting from a time point n+1), based on an angular acceleration a(n) of the rotor, an angular velocity ?(n) of the rotor at the time point n and a time length T of the control cycle; and a PWM inverter for controlling a voltage to be applied to a coil such that a rotating magnetic field based on a rotation position of the rotor advanced by the compensation angle ?? from the rotation position of the rotor at the time point n is formed in the (n+1)th control cycle.

Abstract: A controller for a sensorless permanent magnet synchronous motor having a rotor using a permanent magnet, the rotor rotating by a rotating magnetic field, caused by a current flowing through an armature is provided. The controller is configured to apply a pulse voltage for generating a magnetic field vector for searching for the initial position to each of search sections obtained by dividing a target range, narrow down a target range in such a manner that a search section in which a largest amount of current flows through the armature by application of the pulse voltage is selected as a subsequent target range, and repeat the application processing and the narrow-down processing to estimate the initial position.

Abstract: A method for controlling a permanent magnet synchronous motor having a rotor using a permanent magnet, the rotor rotating by a rotating magnetic field caused by a current flowing through an armature is provided. The method includes: presuming, based on a target speed and an estimated speed that is an estimated value of a rotational speed of the rotor, whether or not a step-out occurs; correcting, when it is presumed that a step-out occurs, an estimated angle that is an estimated value of a position of magnetic poles of the rotor; and controlling, based on a post-correction estimated angle that is the estimated angle after the correction, a current flowing through the armature to cause the rotating magnetic field rotating at the target speed.

Abstract: A controller for a permanent magnet synchronous motor includes an estimating portion configured to determine an estimated value of a rotational speed of the rotor and an estimated value of a position of magnetic poles of the rotor based on a value of the current detected by the current detector and a parameter value indicating an interlinkage magnetic flux caused by the permanent magnet across the winding; a control unit configured to control the drive portion to cause the rotating magnetic field based on the estimated value of the rotational speed and the estimated value of the position of the magnetic poles; and a correction portion configured to correct the parameter value indicating the interlinkage magnetic flux based on correction information, the correction information being determined based on a temperature of the winding and a relationship between the temperature of the winding and a temperature of the permanent magnet.

Abstract: A demodulation section demodulates a received signal. A decoding section decodes an output from the demodulation section. A buffer temporarily stores a portion of the received signal. A header analyzing section gives the buffer timing at which demodulation and decoding of a payload of the received signal are initiated, on the basis of a result of combination of a plurality of header sequences included in a header of the received signal and results of processing of the demodulation section and the decoding section. An improved SNR is achieved by means of combination of the plurality of header sequences, so that an iterative decoding count used for decoding the header become smaller.

Abstract: A controller for a permanent magnet synchronous motor includes an estimating portion configured to determine an estimated value of a rotational speed of the rotor and an estimated value of a position of magnetic poles of the rotor based on a value of the current detected by the current detector and a parameter value indicating an interlinkage magnetic flux caused by the permanent magnet across the winding; a control unit configured to control the drive portion to cause the rotating magnetic field based on the estimated value of the rotational speed and the estimated value of the position of the magnetic poles; and a correction portion configured to correct the parameter value indicating the interlinkage magnetic flux based on correction information, the correction information being determined based on a temperature of the winding and a relationship between the temperature of the winding and a temperature of the permanent magnet.

Abstract: A controller for a permanent magnet synchronous motor includes an estimating portion configured to determine an estimated value of a rotational speed of the rotor and an estimated value of a position of magnetic poles of the rotor based on a value of the current detected by the current detector and a parameter value indicating an interlinkage magnetic flux caused by the permanent magnet across the winding; a control unit configured to control the drive portion to cause the rotating magnetic field based on the estimated value of the rotational speed and the estimated value of the position of the magnetic poles; and a correction portion configured to correct the parameter value indicating the interlinkage magnetic flux based on correction information, the correction information being determined based on a temperature of the winding and a relationship between the temperature of the winding and a temperature of the permanent magnet.

Abstract: A storage which, in operation, stores a first minimum value and a second minimum value each time a plurality of data are input. Round-robin comparison circuitry which, in operation, makes a magnitude comparison among the plurality of data. First selection comparison circuitry and second selection comparison circuitry which, in operation, make a magnitude comparison between the first minimum value and each of the plurality of data and a magnitude comparison between the second minimum value and each of the plurality of data, respectively. Judgment circuitry which, in operation, judges a new first minimum value and a new second minimum value on the basis of a comparison result from the round-robin comparison circuitry and comparison results from the first and second selection comparison circuitry.

Abstract: An image forming apparatus includes: a plurality of image forming units forming an image in the corresponding color by electrophotographic system; a high-voltage power supply circuit capable of generating a bias voltage; and a control unit that controls a first printing mode and a second printing mode, wherein in the second printing mode, the control unit performs such control that the photosensitive bodies provided on the image forming units not used in the second printing mode continuously rotate at a speed lower than a speed in the first printing mode, and/or such control that a bias voltage whose absolute value is less than an absolute value of a bias voltage in the first printing mode is supplied from the high-voltage power supply circuit to the processing components of the same type provided on the image forming units not used in the second printing mode.

Abstract: There is provided an electric wire holder for holding electric wires connected to terminal fittings at end portions of the wires, the holder configured to attach to a shielding pipe to cover an edge of the shielding pipe into which the electric wires are inserted and from which the terminal fittings and a portion of the electric wires are drawn out to an outside of the shielding pipe, the holder comprising: a first holding piece configured to hold the portion of the electric wires that is drawn out from the shielding pipe and to fix a draw-out position of the terminal fittings.

Abstract: An image forming apparatus includes a conveyance sensor disposed near a pair of conveyance rollers so as to accurately detect an amount of movement of the recording paper, a conveyance delay determination unit to determine a conveyance delay of the recording paper, and a conveyance control unit to control drive for rollers. The conveyance delay determination unit obtains conveyance delay information from among information detected with the conveyance sensor, or the like, and accelerates a rotational velocity of the pair of paper feed rollers when the conveyance delay quantity exceeds a threshold.

Abstract: A variable shifter includes: a plurality of shifters that cyclically shift input data having a plurality of bits or cyclically shifted data; and a control unit that selects a shift amount for each of the plurality of shifters in accordance with a predetermined cyclic shift amount. The number of types of the predetermined cyclic shift amount is smaller than the number of bits in the input data, each shifter selects one of a plurality of shift amounts in accordance with the predetermined cyclic shift amount, and the plurality of shift amounts have a combination of shift amounts that differ from one shifter to another.

Abstract: There is provided an electric wire holder for holding electric wires connected to terminal fittings at end portions of the wires, the holder configured to attach to a shielding pipe to cover an edge of the shielding pipe into which the electric wires are inserted and from which the terminal fittings and a portion of the electric wires are drawn out to an outside of the shielding pipe, the holder comprising: a first holding piece configured to hold the portion of the electric wires that is drawn out from the shielding pipe and to fix a draw-out position of the terminal fittings.

Abstract: A phase rotation correcting method includes receiving a signal modulated by a multi-value modulation method; recognizing a position of a symbol point of the received signal on an IQ plane; performing phase rotation for rotating a phase of the symbol point of the received signal toward an I axis or a Q axis in accordance with the recognized position and calculating, as an amount of phase rotation correction, a value on an axis different from the axis toward which the phase of the symbol point has been rotated by the phase rotation; and correcting phase rotation of the symbol point by using the calculated amount of phase rotation correction.