Electricity: motive power systems – Induction motor systems
Patent
1988-12-29
1991-04-30
Ip, Paul
Electricity: motive power systems
Induction motor systems
361386, H02P 763, H05K 720
Patent
active
050121731
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a casing structure for an amplifier unit for an AC spindle, namely, a casing structure for containing an amplifier unit which comprises various circuit components, for amplifying power supplied from a power source and supply amplified driving power to an AC motor for rotatively driving the spindle of a machine tool, and structurally capable of forming an individual amplifier assembly, and more particularly, to an improved casing structure for such an amplifier unit for an AC spindle, capable of enabling an efficient automatic assembly of the amplifier unit before the unit is accommodated in a power panel forming the electrical assembly of a machine tool, and capable of being formed in a lightweight construction.
2. Background Art
A desired power is supplied to an AC motor for rotatively driving the spindle of a machine tool at a high speed, from a power source through an AC amplifier provided on and contained in a power panel provided as one of the components of the electrical assembly or an electrical unit. Usually, to receive power from a three-phase power source and to supply a desired current necessary for rotatively driving the AC motor, such an AC amplifier comprises various circuit components, such as an electric contactor circuit for switching, a reactor circuit for shutting off external noise signals and for preventing the emission of noise signals, a rectifying circuit, a power amplifier circuit, and an inverter circuit. Conventionally, these circuit components are those available on the market and are arranged within the casing so as to meet the output level of the AC motor, and then the assembly of the circuit components and the casing is, attached to the power panel. The casing employs a box formed by cutting and bending an inexpensive steel plate or the like, the circuit components are arranged within the box so that the circuit components are concealed in the casing, and then the circuit components are screwed firmly to the bottom wall of the box.
In process for assembling the amplifier unit for the AC spindle by screwing the circuit components of the amplifier unit to the bottom wall of the box formed of a metallic plate, the bit of a screw driver, namely, a tool for assembling the amplifier unit, must be necessarily inserted deep into the box near to the bottom wall of the box along the circuit components, the tip of the screw driver inserted in the head of a screw, and the screw driver then turned to fasten the circuit unit with the screw. Accordingly, in assembling the amplifier unit by an automatic assembling process, for example, an assembling process employing an industrial robot, an assembling process including inserting a screw driver gripped at the extremity of a robot hand in the box and rotating the screw driver to fasten the screw requires a step of lowering the robot hand to a position at which the tip of the screw driver is inserted in the head of the screw, and a step of raising the robot hand after fastening the screw, and this is one of the factors that adversely affects the efficiency of the automatic assembling process and remarkably reduces the working efficiency. Accordingly, there is a demand for a novel casing structure having an improved design for an amplifier unit for an AC spindle, capable of enabling a highly efficient automatic assembly of the amplifier unit by using an industrial robot.
DISCLOSURE OF THE INVENTION
Accordingly, an object of the present invention is to provide a novel casing structure for an amplifier for an AC spindle, meeting this demand.
Another object of the present invention is to provide a casing structure to facilitate an automatic assembly of an amplifier unit for an AC spindle by the end effector of a manipulator for such an automatic assembly, such as an industrial robot.
The present invention provides an amplifier unit for an AC spindle, electrically interposed between an AC motor for driving the spindle of a machine tool and a power source and comprising a plurality o
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patent: 4621200 (1986-11-01), Lovrenich
patent: 4769557 (1988-09-01), Houf et al.
patent: 4870863 (1989-10-01), Duncan et al.
patent: 4881478 (1989-11-01), Sano
Fujioka Yoshiki
Shinohara Tatsuo
Fanuc Ltd.
Ip Paul
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