Abstract: A pump apparatus which can save space and is easy to handle is proposed. The pump apparatus includes a pipe-shaped casing including a suction port and a discharge port arranged in the same straight line and defining a flow channel that connects the suction port and the discharge port; a motor disposed inside the casing, the motor including a rotating shaft extending along a flow channel direction directing from the suction port to the discharge port, a rotor rotating integrally with the rotating shaft, a stator provided on an outer peripheral side of the rotor, and a can for isolating a rotor chamber and a stator chamber, the rotor chamber having the rotor disposed therein and the stator chamber having the stator disposed therein; and an inverter disposed in the interior of the casing for exercising variable speed control over the motor.

Abstract: A driving apparatus for driving an electric motor, such as a synchronous motor or an induction motor, and more particularly to a driving apparatus which performs a vector control based on an output current of an inverter. The driving apparatus of the present invention includes an inverter, a current detector configured to detect an output current of the inverter, and a vector controller configured to transform the output current, detected by the current detector, into a torque current and a magnetization current and to control the torque current and the magnetization current.

Abstract: The present invention relates to a driving apparatus which performs vector control based on an output current of an inverter. The driving apparatus of the present invention includes a vector controller (11) for transforming three-phase output currents of an inverter (10) into a torque current and a magnetization current, and controlling the torque current and the magnetization current. The vector controller (11) includes a torque-voltage control section (21) for determining a torque-voltage command value based on a deviation between a torque-current command value and the torque current, a magnetization-voltage output section (23) for outputting 0 as a magnetization-voltage command value, a target-magnetization-current determination section (26) for determining a magnetization-current command value based on a deviation between a torque-voltage command value and a target-output-voltage value, and a target-output-voltage determination section (27) for determining the target-output-voltage value.

Abstract: A driving apparatus for driving an electric motor, such as a synchronous motor or an induction motor, and more particularly to a driving apparatus which performs a vector control based on an output current of an inverter. The driving apparatus of the present invention includes an inverter, a current detector configured to detect an output current of the inverter, and a vector controller configured to transform the output current, detected by the current detector, into a torque current and a magnetization current and to control the torque current and the magnetization current.

Abstract: The present invention relates to a driving apparatus which performs vector control based on an output current of an inverter. The driving apparatus of the present invention includes a vector controller (11) for transforming three-phase output currents of an inverter (10) into a torque current and a magnetization current, and controlling the torque current and the magnetization current. The vector controller (11) includes a torque-voltage control section (21) for determining a torque-voltage command value based on a deviation between a torque-current command value and the torque current, a magnetization-voltage output section (23) for outputting 0 as a magnetization-voltage command value, a target-magnetization-current determination section (26) for determining a magnetization-current command value based on a deviation between a torque-voltage command value and a target-output-voltage value, and a target-output-voltage determination section (27) for determining the target-output-voltage value.

Abstract: A motor assembly includes a motor, an inverter for changing rotational speed of the motor, a cooling fan coupled to a rotational shaft of the motor, a guide cover for guiding a gas flow generated by rotation of the cooling fan to the inverter, and at least two support members coupling the inverter to a side surface of the motor. The support members are located on both sides of a center line connecting a central axis of the motor to a center of the inverter as viewed from an axial direction of the motor. A space serving as a passage of the gas flow from the cooling fan is formed between the support members.

Abstract: A motor assembly (2) includes a motor (5), an inverter (6) for changing rotational speed of the motor (5), a cooling fan (8) coupled to a rotational shaft (10) of the motor (5), a guide cover (20) for guiding a gas flow generated by rotation of the cooling fan (8) to the inverter (6), and at least two support members (11) coupling the inverter (6) to a side surface of the motor (5). The support members (11) are located on both sides of a center line (C) connecting a central axis of the motor (5) to a center of the inverter as viewed from an axial direction of the motor (5). A space serving as a passage of the gas flow from the cooling fan (8) is formed between the support members (11).

Abstract: A controller-integrated motor pump is disclosed. The motor pump includes: a pump; a motor configured to drive the pump; a control unit configured to control the motor; and a pressure measuring device configured to measure pressure of fluid at a discharge side of the pump. The control unit is mounted on a motor casing. The control unit includes an inverter configured to produce alternating-current power having a frequency within a band that includes frequencies more than or equal to a commercial frequency, a pump controller configured to produce a torque command value for controlling operation of the pump, and a vector controller configured to determine a voltage command value for the inverter based on the torque command value. The motor has a rotor having a plurality of permanent magnets.

Abstract: A magnetic bearing device for use with a motor-combined structure having magnetic bearings supporting a rotatable shaft out of contact therewith and a motor for rotating the rotatable shaft. A common power supply supplies electric power to the magnetic bearings and the motor, and a motor drive power supply limits variations of the electric power supplied to the motor to at most a predetermined level with respect to variations of electric power supplied to the common power supply.