Abstract: The motor drive device includes: an electric motor (6); a controller (1) that controls a torque of the electric motor (6) or a quantity of state corresponding to the torque; and a torque transmitter that transmits the torque of the electric motor (6) to a wheel of a vehicle. The controller (1) includes a torque fluctuation inhibiting section (15) that inhibits torque fluctuation in the electric motor (6). The torque fluctuation inhibiting section (15) includes an execution determination section (15b) that determines whether or not to inhibit the torque fluctuation in the electric motor (6), based on a result of comparison between an estimated value of a torque fluctuation frequency in the electric motor (6), and one or both of transmission characteristics of the torque transmitter and vibration characteristics in the vehicle.

Abstract: An electric brake device includes: a brake rotor; a friction member; friction member contactor; an electric motor; braking force estimation unit; and a control device. The control device has a control system in which a motor rotation angle of the electric motor is included in a state quantity in a control computing of a follow-up control. The control device includes a state quantity reset function unit that resets at least the motor rotation angle to a predetermined value, on the basis of a predetermined condition using at least one of a target braking force, an estimated value of a braking force, an amount of change of a target braking force, an amount of change of an estimated value of a braking force, and a deviation between a target braking force and an estimated value of the braking force.

Abstract: The electric brake device includes a control device for performing follow-up control such that a braking force estimated value estimated by a braking force estimator follows a given braking force command value. The control device includes an angle-sensorless control function section for determining a phase of phase current of an electric motor irrespective of an actual angle of the electric motor and controlling the electric motor to have a current value that is based on the determined phase of the phase current. The angle-sensorless control function section includes a current phase determination section for determining a current phase that is the phase of the phase current of the electric motor on the basis of a deviation between the braking force command value and the braking force estimated value.

Abstract: A controller of the electric brake device includes a reaction force compensator to perform compensation such that a rotational resistance, of an electric motor, generated by a reaction force to a pressing force of a friction member against a brake rotor is cancelled out. The reaction force compensator includes: a direct estimator to directly estimate the reaction force from information including at least either a drive voltage or current of the electric motor and at least either a rotational angle of the electric motor or a value obtained by differentiating the rotational angle one or more times; an indirect estimator to estimate the reaction force from an estimated braking force on the basis of a set correlation; and a compensation reaction force determiner to determine a reaction force, to perform the compensation, by using estimation results of direct estimation and indirect estimation at predetermined proportions.

Abstract: An electric brake device includes an electric brake actuator and a control device. The controller includes: a brake control calculator that control a braking force so as to follow up a target braking force provided from a host ECU; a brake maintaining current estimator that maintains a motor current at a constant value; and a switching controller that performs switching between the brake control calculator and the brake maintaining current estimator. When a condition that an absolute value of a rate of change of the target braking force is equal to or less than a predetermined value and the braking force is in the follow-up state is satisfied, the switching controller performs switching from the brake control calculator to the brake maintaining current estimator that maintains the motor current at a constant value.

Abstract: Provided is an axial-gap type motor in which positioning among components composing a yoke-provided core is easy so that manufacturing thereof can be performed accurately and easily, and which exhibits superiority in performance and cost. In the axial-gap type motor, either one of a stator and a rotor includes: a yoke-provided core including an annular back yoke and a plurality of magnetic pole cores projecting from a side surface of the back yoke; and coils. The yoke-provided core is a core-pieces-arrayed body obtained by arraying, in a circumferential direction thereof, core pieces obtained through division for the respective magnetic pole cores. Each core piece includes a magnetic pole core portion and a back yoke portion. Each core piece is a steel plate laminate obtained by stacking a plurality of steel plates in a radial direction.

Abstract: Provided is an electric brake device of which braking control accuracy is improved as a result of hysteresis in a load sensor being appropriately compensated for. The electric brake device includes: a direct load estimator configured to estimate a brake pressing force, using an output of the load sensor; an indirect load estimator configured to estimate a brake pressing force without using the output of the load sensor; and a hysteresis interpolator. When switching is performed between pressure increase and pressure decrease which causes hysteresis in the load sensor, the hysteresis interpolator performs control by use of the load estimated by the indirect load estimator without using the load sensor, in a predetermined range after the switching has been performed.

Abstract: This electric brake device includes: a brake rotor, a friction member, a friction member operator, an electric motor, and a controller which controls, by controlling the electric motor, a braking force generated as a result of contact between the friction member and the brake rotor. The electric brake device includes a vehicle speed estimator which estimates the speed of the vehicle having the electric brake device mounted thereon. The controller includes a power limiter which limits the power that drives the electric motor. When an estimated vehicle speed, which is the speed of the vehicle estimated by the vehicle speed estimator, is in a determined low-speed range, the power limiter limits the power in accordance with a condition that has been determined such that the maximum power consumption of the electric brake device decreases in accordance with decrease in the estimated vehicle speed.

Abstract: The electric brake device includes an electric motor, a brake rotor, a friction pad, a conversion mechanism, a braking force command section, a braking force estimation section, a controller, and a power supply device. The controller includes: a power determination section to determine whether an amount of remaining power that can be supplied from a power supply device to the electric motor has become equal to or less than a determined value; and a residual pressure cancellation section to cancel a residual pressure of a braking force by driving the electric motor in a direction opposite to a brake pressing direction such that an estimated value of the braking force obtained by the braking force estimation section becomes equal to or less than a set value, when the power determination section determines that the amount of remaining power has become equal to or less than the determined value.

Abstract: This brake device system includes a plurality of brake devices mounted to a vehicle, each brake device including a brake rotor, a friction pad, friction pad driving assembly, and a control device. The control device is provided with: braking/stoppage determination section configured to cause the friction pad to come into contact with the brake rotor of each brake device, and determine whether or not the vehicle is braking or being kept stopped; and heat conduction suppressing section configured to, when the braking/stoppage determination section has determined that the vehicle is braking or being kept stopped, reduce the braking force of a part of the plurality of brake devices, thereby to reduce heat conductivity of brake friction heat to the friction pad driving assembly.

Abstract: When a rotor performs an ordinary rotation operation, an axial position of the rotor is retained such that the rotor is rotatable with respect to a stator. When a parking brake switch is operated while a vehicle is at stoppage, a rotor slider slides the rotor in an axial direction against a preload of an axially preloading part. This brings an engaging portion of the rotor into engagement with an engaged potion of a housing. The reverse input holder retains the rotation angle of the rotor during the engagement due to the fact that the engagement between the engaging portion and the engaged potion is maintained against a reverse input load acting on the rotor as an external force that accompanies a reaction force of a pressing force of a brake friction member.

Abstract: In this electric linear motion actuator, a linear motion mechanism and an electric motor are arranged in line along the same axis, which is an axis of a rotation input/output shaft of the linear motion mechanism. The electric motor includes a stator and a rotor which are arranged such that the directions of magnetic poles thereof for generating interlinkage magnetic flux contributing to a torque are parallel to a rotation shaft of a motor. The rotor has torque generating surfaces at both faces in the axial direction thereof. The stator has first and second excitation mechanisms arranged on both sides in the axial direction of the rotor. The first and second excitation mechanisms have independent first and second system coil groups. A power supply system for independently supplying power to the first and second system coil groups is provided.

Abstract: Provided is an electric brake device that achieves improved responsiveness, cost reduction and also reduces the copper loss in an electric motor, thus reducing power consumption. The electric brake device includes a brake rotor (8), a friction member (9), a friction member actuator (6), an electric motor (4), a controller (2), a main power supply (3), and an auxiliary power supply (22). The auxiliary supply (22) is charged with regenerative power from the motor (4). The controller (2) includes a backflow power interruption (26) preventing the main supply (3) from being charged with the regenerative power from the motor (4), and an auxiliary power supply controller (24) causing the auxiliary supply (22) to supply running power to the motor (4) when powering the electric (4) is started in a state in which the regenerative power in the auxiliary supply (22) is greater than or equal to a set voltage.

Abstract: Provided is an electric linear actuator that enables reduction of the mounting space and reduction of costs. An electric motor of this electric linear actuator is an axial gap motor including a stator and a rotor which are disposed such that orientations of magnetic poles which generate interlinkage flux which contributes to torque generation are parallel to the rotation axis of the electric motor. Further, a linear motion mechanism and the electric motor are disposed in line along the same axis which serves as the axis of a rotation input and output shaft of the linear motion mechanism. First and second coil terminals have extended portions extended in the outer-diameter side in the radial direction with respect to the rotation axis, and the extended portions are electrically connected to a control device through a wiring mechanism.

Abstract: The electric linear motion actuator includes an electric motor, a linear motion mechanism, and a housing. The linear motion mechanism and the electric motor are arranged side by side on the same axis which is an axis of a rotation input-output shaft of the linear motion mechanism. The electric motor includes a stator and a rotor which are arranged such that directions of magnetic poles that generate interlinkage flux contributing to torque generation are parallel with a rotation shaft of the electric motor. The rotation shaft of the electric motor and the rotation input-output shaft serve as a rotary member formed of a plurality of coupled members. The rotary member is held with respect to the housing by a restricting part that is common to holding in an axial direction and a radial direction of the rotation shaft.

Abstract: Improved maneuverability, improved followability towards a target braking force and enhanced brake feeling when a low braking force is being effected may be achieved. A brake controller unit may include a clearance estimator which may be configured to use a rotational angle ? of a motor to estimate a clearance, inclusive of negative values, between a frictional material and a brake. A target braking force Fr may be compared with a switch-determining braking force Frsw, so that clearance control based on a target clearance Cr may be performed when the frictional material is in approximate-contact state corresponding to the target braking force Fr being low, and so that braking force control may be performed when it is equal to or greater than the switch-determining braking force Frsw.

Abstract: The linear motion mechanism and the electric motor are arranged in the axial direction with a rotary input-output shaft of the linear motion mechanism interposed therebetween. In the electric motor, orientation of a magnetic pole generating interlinkage flux is parallel with a rotation shaft of the motor. The linear motion mechanism has a thrust bearing for retaining a reaction force against a load in the axial direction in association with linear motion of the linear motion part. The control unit has a thrust force applying section for applying a thrust force such that a force acting in the axial direction of the rotary input-output shaft due to interlinkage flux between the stator and the rotor causes generation of a force, in the axial direction, acting on the thrust bearing.

Abstract: The electric linear motion actuator includes an electric motor, a linear motion mechanism configured to convert rotary motion of the electric motor to linear motion of a linear motion part via a rotation input-output shaft, and a housing holding the linear motion mechanism. The electric motor includes a stator and a rotor which are arranged such that the directions of magnetic poles that generate interlinkage flux contributing to a motor torque are parallel with a rotation axis of the electric motor. The stator is arranged so as to be coupled with an axial end surface of the housing. The rotor is arranged so as to have a space, in the axial direction, from the torque generating surface of the stator, and the rotor is fixed to the rotation input-output shaft of the linear motion mechanism.

Abstract: An emulsion composition containing menthyl ethers represented by the formula (1) or a power composition prepared by drying such an emulsion composition can provide an emulsion composition and a powder composition which can be readily incorporated in food and drink or perfumery and has a fresh and mild bitterness (a naringin-like bitterness) with slow bitterness rising; in the formula (1), X represents a partial structural formula (1-a) or (1-b), and R1 and R2 each represent a methyl group, an ethyl group, a propyl group or an isopropyl group.

Abstract: The motor drive device includes: an electric motor (6); a controller (1) that controls a torque of the electric motor (6) or a quantity of state corresponding to the torque; and a torque transmitter that transmits the torque of the electric motor (6) to a wheel of a vehicle. The controller (1) includes a torque fluctuation inhibiting section (15) that inhibits torque fluctuation in the electric motor (6). The torque fluctuation inhibiting section (15) includes an execution determination section (15b) that determines whether or not to inhibit the torque fluctuation in the electric motor (6), based on a result of comparison between an estimated value of a torque fluctuation frequency in the electric motor (6), and one or both of transmission characteristics of the torque transmitter and vibration characteristics in the vehicle.