Abstract: A motor drive control device includes a control circuit configured to output a drive control signal for driving a motor, and a drive circuit configured to drive the motor with the drive control signal. The control circuit calculates a lead angle value ? allowing a d-axis current value Id of a two-phase rotating coordinate system to be zero with a q-axis current value Iq calculated from drive current values Iu, Iv, and Iw of a coil of the motor and rotation speed ? of a rotor of the motor. The control circuit performs a space vector conversion based on an angle ? obtained by adding the lead angle value ? and rotation angle ? and voltage command value Vref of the two-phase rotating coordinate system calculated to reduce a difference between the q-axis current value Iq and a q-axis current command value Iqref, to generate the drive control signal.

Abstract: A body motion determination system (100) configured to determine whether or not a subject (S) on a bed (BD) has a body motion includes: a plurality of load detectors (11, 12, 13, 14) each configured to detect the load of the subject on the bed; a respiratory waveform obtaining unit (32) configured to obtain a respiratory waveform of the subject based on a temporal variation of the load of the subject detected by each of the plurality of load detectors; and a body motion determining unit (33) configured to determine whether or not the subject has the body motion based on a comparison between a first threshold value and a standard deviation of the temporal variations in the load of the subject detected by at least one of the plurality of load detectors. The body motion determining unit is configured to compensate the standard deviation to be used in the comparison by an amplitude of the respiratory waveform.

Abstract: A motor drive control device includes a drive circuit configured to drive a motor with a drive control signal for driving the motor, and a control circuit configured to perform a vector control arithmetic operation based on a detection result of drive currents of coils of the motor, to generate the drive control signal and supply the drive control signal to the drive circuit. When generating the drive control signal, the control circuit estimates a rotation angle of a rotor of the motor and a rotation speed of the rotor with a q-axis current value of a two-phase rotating coordinate system calculated with a detection result of the drive current, and a q-axis voltage command value of the two-phase rotating coordinate system, by using a linear Kalman filter including a prediction step and an update step, using a stationary Kalman filter with the prediction step expressed linearly and time-invariantly.

Abstract: A motor drive control device capable of reliably acquiring currents of coils of two phases by a one-shunt current detection system is provided. The motor drive control device includes: a motor drive unit including an inverter circuit; a single current detection circuit connected to a direct current line of the inverter circuit, and detecting a current flowing through the direct current line; and a control circuit unit performing analog-to-digital conversion processing of the current to take in the current, and performing PWM control on the motor drive unit.

Abstract: A degradation-determination system includes a volume change detecting unit configured to detect a volume change of a lithium-ion battery, a capacity change detecting unit configured to detect a capacity change of the lithium-ion battery, and a charge control unit configured to control charge of the lithium-ion battery. The charge control unit is configured to determine that the lithium-ion battery is in a state of degradation, upon occurrence of a condition in which volume expansion of the lithium-ion battery is detected by the volume change detecting unit, in conjunction with a condition in which a decrease in a capacity of the lithium-ion battery is not detected by the capacity change detecting unit.

Abstract: A degradation-determination system includes at least four strain gauges that are installed on a principal surface of a lithium-ion battery and each of which is configured to detect pressure of a battery surface at a corresponding installation position, and a degradation determining unit configured to determine degradation of the lithium-ion battery based on measured values at the strain gauges. The degradation determining unit is configured to estimate a maximum expansion position where volume expansion is maximal in a region defined by the strain gauges, of the surface of the lithium-ion battery.

Abstract: A biological information monitoring system (100) configured to monitor biological information of a subject (S) on a bed (BD) includes at least one load detector (11, 12, 13, 14) provided below the bed or legs of the bed and configured to detect a load of the subject on the bed, a waveform calculation unit (31) configured to calculate a waveform indicating a temporal variation in a detected value of the at least one load detector in accordance with respiration or a heartbeat of the subject, and a biological information calculation unit (32) configured to calculate a respiration rate or a heart rate of the subject by using the waveform.

Abstract: A degradation-determination system includes at least four strain gauges that are installed on a principal surface of a lithium-ion battery and each of which is configured to detect pressure of a battery surface at a corresponding installation position, and a degradation determining unit configured to determine degradation of the lithium-ion battery based on measured values at the strain gauges. The degradation determining unit is configured to estimate a maximum expansion position where volume expansion is maximal in a region defined by the strain gauges, of the surface of the lithium-ion battery.

Abstract: A biological information monitoring system (100) configured to monitor biological information of a subject (S) on a bed (BD) includes at least one load detector (11, 12, 13, 14) provided below the bed or legs of the bed and configured to detect a load of the subject on the bed, a waveform calculation unit (31) configured to calculate a waveform indicating a temporal variation in a detected value of the at least one load detector in accordance with respiration or a heartbeat of the subject, and a biological information calculation unit (32) configured to calculate a respiration rate or a heart rate of the subject by using the waveform.

Abstract: A motor drive control device includes a drive circuit configured to drive a motor with a drive control signal for driving the motor, and a control circuit configured to perform a vector control arithmetic operation based on a detection result of drive currents of coils of the motor, to generate the drive control signal and supply the drive control signal to the drive circuit. When generating the drive control signal, the control circuit estimates a rotation angle of a rotor of the motor and a rotation speed of the rotor with a q-axis current value of a two-phase rotating coordinate system calculated with a detection result of the drive current, and a q-axis voltage command value of the two-phase rotating coordinate system, by using a linear Kalman filter including a prediction step and an update step, using a stationary Kalman filter with the prediction step expressed linearly and time-invariantly.

Abstract: A motor drive control device includes a control circuit configured to output a drive control signal for driving a motor, and a drive circuit configured to drive the motor with the drive control signal. The control circuit calculates a lead angle value ? allowing a d-axis current value Id of a two-phase rotating coordinate system to be zero with a q-axis current value Iq calculated from drive current values Iu, Iv, and Iw of a coil of the motor and rotation speed ? of a rotor of the motor. The control circuit performs a space vector conversion based on an angle ? obtained by adding the lead angle value ? and rotation angle ? and voltage command value Vref of the two-phase rotating coordinate system calculated to reduce a difference between the q-axis current value Iq and a q-axis current command value Iqref, to generate the drive control signal.

Abstract: An in-bed state monitoring system (100) for monitoring an in-bed state of a subject on a bed includes: four load detectors (11, 12, 13, 14) which are configured to be placed at four corners of the bed to detect a load of the subject; and an edge sitting posture determining unit (33) configured to predict that the subject is reaching a state of edge sitting posture based on a change in a magnitude relation between detection values from two load detectors, which are of the four load detectors and are placed to interpose the bed between the two load detectors in a diagonal direction of the bed.

Abstract: There is provided a biological state monitoring system for monitoring biological state of subject on a bed. The system includes at least one load detector and a controller. In a case that the controller determines that body motion is not twitch, the controller ceases to output estimated value of respiratory rate, or outputs first estimated value which is the latest among estimated values obtained in first period, the first period being directly preceding body motion and being determined by the controller to be a period in which subject has no body motion. In a case that the controller determines that body motion is twitch, the controller successively outputs newly obtained estimated values of respiratory rate.

Abstract: A degradation-determination system includes at least four strain gauges that are installed on a principal surface of a lithium-ion battery and each of which is configured to detect pressure of a battery surface at a corresponding installation position, and a degradation determining unit configured to determine degradation of the lithium-ion battery based on measured values at the strain gauges. The degradation determining unit is configured to estimate a maximum expansion position where volume expansion is maximal in a region defined by the strain gauges, of the surface of the lithium-ion battery.

Abstract: A degradation-determination system includes a volume change detecting unit configured to detect a volume change of a lithium-ion battery, a capacity change detecting unit configured to detect a capacity change of the lithium-ion battery, and a charge control unit configured to control charge of the lithium-ion battery. The charge control unit is configured to determine that the lithium-ion battery is in a state of degradation, upon occurrence of a condition in which volume expansion of the lithium-ion battery is detected by the volume change detecting unit, in conjunction with a condition in which a decrease in a capacity of the lithium-ion battery is not detected by the capacity change detecting unit.

Abstract: A body motion determination system for determining whether a body motion of a subject (S) on a bed (BD) presents or not, includes a load detector (11, 12, 13, 14) configured to detect a load of the subject on the bed; a non-negative-valued average calculating unit (313) configured to calculate a non-negative-valued average of a detection value of the load detector; and a threshold value setting unit (315) configured to set a threshold value to be used in determining whether the body motion of the subject presents or not, based on the non-negative-valued average calculated in a resting period in which the subject merely performs a respiration.

Abstract: A biological state monitoring system (100, 200) for monitoring a biological state of a subject on a bed (BD) includes: at least one load detector (11, 12, 13, 14) configured to detect a load of the subject on the bed; a body motion determining unit (33) configured to determine whether or not the subject has a body motion, based on a temporal variation of a detection value of the load detector; a respiratory rate estimating unit (34) configured to successively obtain and output estimated values of respiratory rate of the subject, based on the temporal variation of the detection value of the load detector; and a twitch determining unit (35) configured to determine whether or not a body motion is a twitch, based on a duration of the body motion of the subject.

Abstract: A body motion determination system (100) configured to determine whether or not a subject (S) on a bed (BD) has a body motion includes: a plurality of load detectors (11, 12, 13, 14) each configured to detect the load of the subject on the bed; a respiratory waveform obtaining unit (32) configured to obtain a respiratory waveform of the subject based on a temporal variation of the load of the subject detected by each of the plurality of load detectors; and a body motion determining unit (33) configured to determine whether or not the subject has the body motion based on a comparison between a first threshold value and a standard deviation of the temporal variations in the load of the subject detected by at least one of the plurality of load detectors. The body motion determining unit is configured to compensate the standard deviation to be used in the comparison by an amplitude of the respiratory waveform.

Abstract: An in-bed state monitoring system (100) for monitoring an in-bed state of a subject on a bed includes: four load detectors (11, 12, 13, 14) which are configured to be placed at four corners of the bed to detect a load of the subject; and an edge sitting posture determining unit (33) configured to predict that the subject is reaching a state of edge sitting posture based on a change in a magnitude relation between detection values from two load detectors, which are of the four load detectors and are placed to interpose the bed between the two load detectors in a diagonal direction of the bed.

Abstract: A motor drive controller includes: a phase current detection circuit including: an RC network circuit in which a resistor and a capacitor are connected in series, the RC network circuit being configured to be connected in parallel with one or more coils of each phase of a motor; and a filter circuit that smooths a signal based on a voltage signal across the capacitor, wherein the phase current detection circuit generates a DC voltage signal that corresponds to a change in a value of a phase current flowing in the coils; a motor driver that drives the motor by applying a voltage to each phase of the motor; and a controller that receives the DC voltage signal from the phase current detection circuit and controls the motor driver based on the DC voltage signal.