Abstract:
In the present invention, an oil pressure unit includes an inverter 14 for supplying electric power to a motor 15; a load sensor 17 for detecting a load of the oil pressure pump 16A; a rotation sensor 19 for detecting a rotation speed of the motor 15; a current command value calculation means 12 for calculating a current command value so that a deviation between a speed command value representing a target rotation speed of the motor 15 and a rotation speed of the motor 15 converges to zero; a correction means 18A for correcting the current command value based on the load of the oil pressure pump 16A; and a control signal generation means for outputting a control signal to the inverter 14 based on a corrected current command value.
Abstract:
A motor 1 according to an embodiment of the present disclosure includes a rotor 10 configured to freely rotate around a rotation axis AX; and a stator 20 arranged inside the rotor 10 and including a stator unit 21 of a claw-pole type, the stator unit including a winding wire 212 that is annularly wound around the rotation axis AX and a stator core 211 provided so as to surround the winding wire, wherein the stator 20 includes an inner space 24A around the rotation axis AX and in communication with an outer side of the rotor 10, such that heat can be radiated to the inner space 24A.
Abstract:
A technique capable of implementing a more appropriate layout of a lead wire extending from a coil wire of a stator in a claw pole-type rotary electrical device is provided. A claw pole motor 1 according to an embodiment of the present disclosure includes a rotor 10 freely rotatable about a rotation axis AX; a stator 20 including a coil 212 wound around in an annular state and a stator core 210 of a claw pole-type provided so as to surround a periphery of the coil 212; and a lead wire LL extending from the coil 212, wherein the stator core 210 includes a through-hole 210D provided centered around the rotation axis and penetrating in an axial direction and a through-hole 210E, in which the lead wire LL is arranged, penetrating in the axial direction.
Abstract:
A hydraulic unit having an inverter (14) for supplying electric power to a motor (15), a load sensor (17) for sensing a load on a hydraulic pump (16A), a rotation sensor (19) for sensing the rotation speed of the motor (15), a current-command-value calculation means (12) for calculating an electric-current command value so that the difference between a speed command value representing a target rotation speed of the motor (15) and the rotation speed of the motor (15) is converged to zero, correction means (18A) for correcting the electric-current command value based on the load on the hydraulic pump (16A), and control signal creation means for outputting a control signal to the inverter (14) based on the corrected electric-current command value.
Abstract:
With a steering wheel steered to the left, a control valve connects a first cylinder port A to a pump port P and connects a second cylinder port B to a discharge port T, and with the steering wheel steered to the right, the control valve connects the first cylinder port A to the discharge port T and connects the second cylinder port B to the pump port P. When the control valve is at a neutral position, the pump port P is connected to the first cylinder port A and to the second cylinder port B and the discharge port T is isolated from the pump port P, the first cylinder port A, and the second cylinder port B.
Abstract:
An apparatus for warm up control of an autonomous inverter-driven hydraulic unit comprises a warm up control section 15 and a switch section 16. The warm up control section 15 performs a predetermined process using a current speed and current pressure as input information and outputs a first switch command. The switch section 16 is controlled by the first switch command so as to control on/off of power supplied to a fan motor 7a. The apparatus causes an oil temperature to quickly rise to a level where a hydraulic unit driven by a hydraulic pump can work in an optimum condition.