Abstract: In the present invention, an electric motor model comprises: a model of a coil of a stator; and a model of a temperature detector for detecting the temperature of the coil. A parameter such as a thermal capacity is included in the electric motor model. Provided is a parameter setting unit comprising a parameter calculation unit that calculates a parameter so that a change in the temperature of the model of the temperature detector corresponds to a change in the actual temperature. The parameter calculation unit includes an evaluation unit that evaluates the temperature of the model of the temperature detector, the temperature having been calculated using the temporarily set parameter. The evaluation unit evaluates the temperature of the model of the temperature detector without evaluating any variables besides the temperature of the model of the temperature detector.

Abstract: An estimation unit of this temperature estimation device estimates the temperature of a temperature detector attached to a coil of a stator using a model of an electric motor. Coefficients related to heat transfer are set between models of components of the electric motor. At least some parameters of coefficients related to the heat capacity and the heat transfer of the models of the components are set to values different from coefficients related to the actual heat capacity and the actual heat transfer. The estimation unit calculates a calorific value due to the iron loss of a stator core in the model of the motor. The estimation unit corrects the iron loss so that the iron loss becomes smaller as the temperature of the rotor becomes higher.

Abstract: This estimation device comprises a calculation unit that calculates variables indicating the drive state of an electric motor of a machine tool on the basis of a simulation program. The simulation program is a program in which a first auxiliary variable relating to a load factor for estimating the drive state of the electric motor is added to a command statement of a machining program for driving the machine tool. The calculation unit calculates changes in the speed of the electric motor over time on the basis of output characteristics of the electric motor, inertia related to driving of the electric motor, and the first auxiliary variable.

Abstract: A rotor includes: a rotor core; a plurality of plate-shaped magnets forming multiple poles, each arranged in the rotor core with a pair of magnetic pole faces thereof being positioned in a direction intersecting with the radial direction of the rotor core; and a plurality of voids formed in the rotor core, each arranged in contact with the magnetic pole face that is located on a side closer to the central axis of the rotor core, of each of the magnets forming multiple poles.

Abstract: A machine learning device which learns fault prediction of one of a main shaft of a machine tool and a motor driving the main shaft, including a state observation unit observing a state variable including at least one of data output from a motor controller controlling the motor, data output from a detector detecting a state of the motor, and data output from a measuring device measuring a state of the one of the main shaft and the motor; a determination data obtaining unit obtaining determination data upon determining one of whether a fault has occurred in the one of the main shaft and the motor and a degree of fault; and a learning unit learning the fault prediction of the one of the main shaft and the motor in accordance with a data set generated based on a combination of the state variable and the determination data.

Abstract: A motor information acquisition system is provided that acquires information representing an operation state of a motor included in a machine tool in order to monitor a state of the machine tool and that includes a motor control device configured to control the motor based on control data, a timing generation section configured to generate acquisition timing of the information representing the operation state of the motor based on the control data, a rotor magnetic flux reduction command output section configured to output a command for reducing a magnetic flux density of a rotor of the motor to the motor control device when the acquisition timing is reached, and a motor information acquisition section configured to acquire information representing the operation state of the motor when the magnetic flux density of the rotor is reduced by the command.

Abstract: A rotor core of a magnet-embedded electric motor includes a first tubular member and a second tubular member coaxially fixed to a shaft. The first tubular member includes a magnet fixing hole in which the magnet is fixed and a recess formed in an outer circumferential surface. The second tubular member includes a magnet fixing hole in which the magnet is fixed. The magnet fixing hole includes an arrangement region where the magnet is arranged, and an escape region having a size that allows magnet fixing agent to accumulate. The arrangement region of the first tubular member communicates with the arrangement region of the second tubular member, and the recess of the first tubular member communicates with the escape region of the second tubular member.

Abstract: A numerical control system detects a state amount indicating an operation state of a machine tool, creates a characteristic amount that characterizes the state of a machining operation from the detected state amount, infers an evaluation value of the operation state of the machine tool from the characteristic amount, and detects an abnormality in the operation state of the machine tool on the basis of the inferred evaluation value. The numerical control system generates and updates a learning model by machine learning that uses the characteristic amount, and stores the learning model in correlation with a combination of conditions of the machining operation of the machine tool.

Abstract: A motor information acquisition system is provided that acquires information representing an operation state of a motor included in a machine tool in order to monitor a state of the machine tool and that includes a motor control device configured to control the motor based on control data, a timing generation section configured to generate acquisition timing of the information representing the operation state of the motor based on the control data, a rotor magnetic flux reduction command output section configured to output a command for reducing a magnetic flux density of a rotor of the motor to the motor control device when the acquisition timing is reached, and a motor information acquisition section configured to acquire information representing the operation state of the motor when the magnetic flux density of the rotor is reduced by the command.

Abstract: A rotor includes: a rotor core; a plurality of plate-shaped magnets forming multiple poles, each arranged in the rotor core with a pair of magnetic pole faces thereof being positioned in a direction intersecting with the radial direction of the rotor core; and a plurality of voids formed in the rotor core, each arranged in contact with the magnetic pole face that is located on a side closer to the central axis of the rotor core, of each of the magnets forming multiple poles.

Abstract: A numerical control method at least controls a spindle motor of a machine tool so as to perform machining in accordance with machining conditions. In the method, vibration occurring in a tool is acquired with a vibration acquisition unit, and the machining on a workpiece performed by a machining control unit is stopped when vibration having a predetermined amplitude or greater occurs in the tool. Based on state data indicating the state of the spindle motor at that time, multiple compensation plans for compensating the state of the spindle motor in order to suppress vibration occurring in the tool are calculated. The thus calculated multiple compensation plans are displayed on a display unit together with the state of the spindle motor at the time of occurrence of vibration having the predetermined amplitude or greater in the tool.

Abstract: Upon performing diagnosis of a machine tool, etc., data suited to diagnosis is acquired while also reducing the burden on the user. A diagnostic data acquisition system that acquires diagnostic data for diagnosing a machine tool includes: a control unit that controls driving of a mobile part of the machine tool based on control data; a timing generation unit that generates an acquisition timing for the diagnostic data based on the control data; and a diagnostic data acquisition unit that acquires data which varies accompanying driving of the mobile part according to control by the control unit, as the diagnostic data.

Abstract: A rotor core of a magnet-embedded electric motor includes a first tubular member and a second tubular member coaxially fixed to a shaft. The first tubular member includes a magnet fixing hole in which the magnet is fixed and a recess formed in an outer circumferential surface. The second tubular member includes a magnet fixing hole in which the magnet is fixed. The magnet fixing hole includes an arrangement region where the magnet is arranged, and an escape region having a size that allows magnet fixing agent to accumulate. The arrangement region of the first tubular member communicates with the arrangement region of the second tubular member, and the recess of the first tubular member communicates with the escape region of the second tubular member.

Abstract: A motor includes a facing member having a part facing a rotary shaft, a seal member having elasticity, and an annular member supporting the seal member. Magnets are disposed on the outer circumferential surface of the rotary shaft. Coil units are disposed on the inner circumferential surface of the annular member. The annular member is rotated by a magnetic force in the same direction as the rotary shaft when the rotary shaft rotates. The seal member rotates with the annular member at a rotation speed that is lower than a rotation speed of the rotary shaft.

Abstract: A centrifugal blower includes a rotation shaft, an impeller, a casing. The impeller includes a plurality of blades and a side panel. The casing accommodates the impeller and includes an air intake portion positioned adjacent to the side panel. The air intake portion includes a downstream end portion and an inner wall surface. The side panel includes an upstream end portion and an inner panel surface that is an inner surface of the side panel. The downstream end portion and the upstream end portion face each other across a space in an angular range. A difference between a smallest inner radius of the inner wall surface of the air intake portion and a smallest inner radius of the inner panel surface is smaller than or equal to a thickness of the side panel in the angular range.

Abstract: A spindle structure capable of accelerating the flow of a fluid in through holes of a rotor. The spindle structure includes a rotatable rotation part. The rotation part includes a tool holding part provided at an axial direction one end of the rotation part and through holes that penetrate the rotation part and open at the end in the axial direction. Further the spindle structure includes a vane provided in the through holes. When the rotation part rotates, the vane rotates with the rotation part to allow a fluid in the interior of the through holes to flow toward the end in the axial direction.

Abstract: A motor includes a rotor including a shaft and a rotor body, a bearing fitted to the shaft and rotatably holding the shaft, a bearing holder arranged on the opposite side to the rotor body so as to hold the bearing, a movement regulation member arranged closer to the rotor body than the bearing and separated to regulate movement of the bearing toward the rotor body, a first engagement part provided at the rotor body to be adjacent to the movement regulation member, a first engagement target part provided at the movement regulation member to be adjacent to the rotor body to be able to be engaged with the first engagement target part, a second engagement part provided at the movement regulation member, a second engagement target part provided at the bearing holder, and a coupling member that couples the bearing holder and the movement regulation member.

Abstract: A failure detection device includes a formaldehyde sensor that detects the generation of formaldehyde, a vibration sensor that detects vibration of a spindle head, and a machine controller that detects the occurrence of an abnormality of a spindle bearing. The machine controller determines the occurrence of the abnormality of the spindle bearing and a cause of the abnormality based on a change in the output value of the formaldehyde sensor over time and a change in the output value of the vibration sensor over time.

Abstract: A spindle structure capable of accelerating the flow of a fluid in through holes of a rotor. The spindle structure includes a rotatable rotation part. The rotation part includes a tool holding part provided at an axial direction one end of the rotation part and through holes that penetrate the rotation part and open at the end in the axial direction. Further the spindle structure includes a vane provided in the through holes. When the rotation part rotates, the vane rotates with the rotation part to allow a fluid in the interior of the through holes to flow toward the end in the axial direction.

Abstract: An electric motor is provided with an annular member supported by a cylindrical member of a front housing. The annular member includes an opposite part spaced from a surface of a ring member in a rotary shaft, which extends in the circumferential direction. The annular member includes first cover part opposed to first surface of the ring member, and second cover part opposed to second surface of the ring member. The first cover part and the second cover part are spaced from the ring member so that a pressure in a space sandwiched by the first cover part and the first surface is equalized with a pressure in a space sandwiched by the second cover part and the second surface.