Abstract: A motor drive apparatus in which a main power supply used for motor drive is supplied via a magnetic contactor includes: a monitoring unit that monitors a main power supply voltage at an AC power supply input side of the magnetic contactor in a state in which contacts of the magnetic contactor are opened; a determination unit that determines whether the main power supply voltage monitored by the monitoring unit is normal; and a magnetic contactor control unit that outputs a command that controls opening and closing of contacts of the magnetic contactor, wherein when it is determined by the determination unit that the main power supply voltage is abnormal, the magnetic contactor control unit maintains an output of an open command such that the contacts of the magnetic contactor are opened.

Abstract: A machine learning apparatus that learns predicted life of a power device of a motor driving apparatus converting DC power into AC power by a switching operation of the power device to supply the AC power to an AC motor includes: a state observation unit that observes a state variable constituted by data regarding the number of times of switching of the power device, data regarding junction temperature of the power device, and data regarding presence or absence of a failure of the power device; and a learning unit that learns the predicted life of the power device in accordance with a training data set defined by the state variable.

Abstract: A liquid ejecting head includes a first substrate in which a piezoelectric element is provided; and a second substrate on which the first substrate is connected to a first surface, in which the second substrate is provided with a penetration hole, which penetrates through the second substrate in a plate thickness direction, and penetration wiring, which is formed from a conductor that is formed in an inner portion of the penetration hole, the penetration wiring is formed from a first end portion, which is provided on a first surface side, a second end portion, which is provided on a second surface side, which is a surface that is on an opposite side to the first surface, and connection wiring, which connects the first end portion and the second end portion, and a cross-sectional area of the connection wiring in a planar direction of the first surface is smaller than cross-sectional areas of the first end portion and the second end portion in the planar direction.

Abstract: A liquid ejecting head includes a pressure chamber formation substrate having a pressure chamber formed therein, a flow path formation substrate that is connected to the pressure chamber formation substrate, and that has a flow path in communication with the pressure chamber formed in a state penetrating through the flow path formation substrate in a thickness direction thereof, and a nozzle plate that is connected to the flow path formation substrate on an opposite side to the pressure chamber formation substrate, and that has a nozzle in communication with the flow path opened therein. The flow path formation substrate is configured from a single substrate, and an opening area on a pressure chamber side of the flow path is formed wider than an opening area on a nozzle side of the flow path.

Abstract: An electronic device includes a plurality of substrates joined together in a stacked state, a space formed in one substrate out of the plurality of substrates, and a movable region configured by one face out of faces bounding the space. The movable region includes a recess indented from a space side to partway along a thickness direction of the movable region. An internal dimension of the recess in a direction perpendicular to a substrate stacking direction is larger than an internal dimension of the space in the direction perpendicular to the substrate stacking direction, and a wall bounding the space in the one substrate, and at least a portion of a bottom face of the recess, are adhered together by an adhesive.

Abstract: A motor drive system enabling detection of cutting fluid deposited at a housing of electronic components. A housing holding electronic components of a motor drive system has top faces slanted with respect to the horizontal plane so as to guide the deposited cutting fluid. The housing further includes storage parts collecting the cutting fluid guided along the top faces. The storage parts may be graduated so as to enable the collected amount of the cutting fluid to be measured. The storage parts may be configured to be detachable from the housing.

Abstract: A controller that makes an electric motor efficiently operate in accordance with an ambient temperature. The controller includes a machine learning apparatus learning an operating command to the electric motor. The machine learning apparatus includes a status observing part and learning part. The status observing part observes an ambient temperature of an electric motor apparatus and a cycle time of the electric motor as status variables. The learning part learns an operating command to the electric motor in accordance with a training data set prepared based on a combination of the judgment data acquired by a judgment data acquiring part and the status variables.

Abstract: A machine learning apparatus according to the present invention, which learns the operation conditions of a cooling device for cooling a motor or a motor control apparatus, includes a state observer for observing a state variable including at least one of temperature data of the motor and the motor control apparatus at a specific position during operation of the cooling device; a determination data acquisition unit for acquiring determination data that determines a margin of acceptable value of a loss in each of the motor, the motor control apparatus, and the cooling device and a margin of acceptable value of the temperature of each of the motor and the motor control apparatus at the specific position; and a learner for learning the operation conditions of the cooling device in accordance with a training data set constituted of a combination of the state variable and the determination data.

Abstract: A motor drive device is capable of allowing a user to surely recognize that effect when a cutting fluid adheres to a casing. The motor drive device includes an electronic component and a casing that houses the electronic component. A part of the casing changes color when coming in contact with a cutting fluid and the casing may change to different colors based on the concentration of the cutting fluid.

Abstract: A printed circuit board according to an embodiment of the present invention is formed of an insulating material and configured to mount components and wiring thereon. The printed circuit board includes a liquid pool for storing a liquid; a pair of deterioration detection traces one of which is connected to a power supply at one end and disposed in the liquid pool at the other end, and the other of which is connected to a ground at one end through a resistor and disposed in the liquid pool at the other end; a voltage detection circuit for detecting a voltage between the one ends of the one and the other deterioration detection traces; and a deterioration determination circuit for determining, based on the detected voltage, whether or not insulation deteriorates between the other ends of the one and the other deterioration detection traces.

Abstract: A motor driving device includes: a rectifier that rectifies an AC current and outputs a DC current to a DC link; an inverter unit that converts the DC current to an AC current for a motor; an initial charging unit that initially charges a smoothing capacitor with the DC current that flows through a charging resistor; a storage unit that stores a load capability of the charging resistor; a power calculation unit that calculates an amount of power generated in the charging resistor in response to the DC current flowing therethrough; and an opening/closing unit that shuts off the DC current from flowing in the smoothing capacitor when the amount of power reaches the load capability during an initial charging period and allows the DC current to flow in the smoothing capacitor after the shutoff when the amount of power is smaller than or equal to a threshold value.

Abstract: A liquid ejection apparatus manufacturing method includes forming a metallic film in at least the section to be cut of a bonding surface between the flow path forming substrate (a second substrate) and the protection substrate (a first substrate); forming a first fragile section on the protection substrate by irradiating the section to be cut of the protection substrate bonded to the flow path forming substrate from the protection substrate side with a laser beam whose condensing point is focused thereon, and forming a second fragile section on the flow path forming substrate by melting the metallic film of the section to be cut; and dividing the protection substrate and the flow path forming substrate bonded to each other along the first fragile section and the second fragile section.

Abstract: A developing roller that is capable of carrying toner on a surface thereof, and that supplies the toner carried on the surface to a surface of a photosensitive drum when a voltage is applied thereto, includes: a rubber layer; and a surface layer that covers the rubber layer, contains alumina, and has a higher volume resistivity than the rubber layer.

Abstract: A developing roller that is capable of carrying toner on a surface thereof, and that supplies the toner carried on the surface to a surface of a photosensitive drum when a voltage is applied thereto, includes: an elastic layer; and a surface layer that covers the elastic layer and contains aluminum oxide, wherein the aluminum oxide of the surface layer contains tetracoordinated aluminum atoms and hexacoordinated aluminum atoms existing in a higher proportion than the tetracoordinated aluminum atoms.

Abstract: A diode includes an anode connected to the other ends of brake coils, and a cathode connected to one end of a smoothing capacitor. A diode includes an anode connected to the other end of the smoothing capacitor, and a cathode connected to one ends of the brake coils. By providing the diodes, energy stored in the brake coils, when at least one of an NPN type transistor and an NPN type transistor is in an on-state, is returned to the smoothing capacitor when the NPN type transistors are in an off-states.

Abstract: A motor driving apparatus of the present invention includes a converter unit configured to convert an AC voltage into a DC voltage, a DC link unit configured to smooth the DC voltage by a capacitor to generate a DC link voltage, an inverter unit configured to convert the DC link voltage into a multiphase AC voltage for motor driving, short bars configured to electrically interconnect terminals of the DC link unit and terminals of the inverter unit, and a DC link voltage detection unit configured to detect the DC link voltage. At least parts of the short bars are located between the terminals of the DC link unit and terminals of the DC link voltage detection unit.

Abstract: A first switching element is connected to one end of a brake and switches from the off state to the on state when a switch command is input to cause a brake drive current to flow through the brake. A second switching element is connected to the other end of the brake and switches from the off state to the on state when the switch command is input to cause a brake drive current to flow through the brake. A voltage detection unit detects a brake voltage being applied to the brake. A switch command delay unit delays the switch command input to the first switching element. A short circuit determination unit determines whether or not a short circuit has occurred in the first switching element based on the brake voltage and the switch command delayed by the switch command delay unit.

Abstract: A developing roller that is capable of carrying toner on a surface thereof, and that supplies the toner carried on the surface to a surface of a photosensitive drum when a voltage is applied thereto, includes: an elastic layer; and a surface layer that covers the elastic layer and contains aluminum oxide, wherein the aluminum oxide of the surface layer contains tetracoordinated aluminum atoms and hexacoordinated aluminum atoms existing in a higher proportion than the tetracoordinated aluminum atoms.

Abstract: A developing roller that is capable of carrying toner on a surface thereof, and that supplies the toner carried on the surface to a surface of a photosensitive drum when a voltage is applied thereto, includes: a rubber layer; and a surface layer that covers the rubber layer, contains alumina, and has a higher volume resistivity than the rubber layer.

Abstract: A brake abnormality diagnosis device which diagnoses an abnormality in a brake of a brake-equipped motor provided in a robot or a machine tool, includes: an abnormality diagnosis unit which performs a diagnosis as to whether or not there is an abnormality in the brake, while the motor is excited and the brake is activated; and an output unit which, if it is diagnosed that there is an abnormality in the brake, notifies the abnormality in the brake without interrupting the excitation of the motor and without releasing the brake.