Control unit of a motor for an injection molding machine
AssigneeNokia Corporation
InventorAkira Ito
Life of this patent
Estimating the term…
Abstract
First and second three-phase inverters having self-diagnosing circuits are connected to three-phase windings of a three-phase double-winding type motor, respectively, and first and second servo controllers having self-diagnosing circuits are connected to the three-phase inverters, respectively. When an abnormality occurs in the three-phase inverter or the servo controller, the occurrence of the abnormality is signaled to the servo controller. When abnormality occurs in the three-phase inverter or the servo controller, the occurrence of the abnormality is signaled to the servo controller, thereby stopping rotation of the motor.
Claims19
An injection molding machine having a control unit, wherein the control unit controls an AC motor having a plurality of sets of three-phase windings, the control unit comprising:
- a plurality of three-phase inverters connected to said plurality of sets of three-phase windings, respectively,
- a plurality of servo controllers connected to said plurality of three-phase inverters, respectively, and
- said plurality of servo controllers being connected through a signal line so that a drive current phase fed from said plurality of three-phase inverter to said plurality of sets of three-phase windings coincides with a corresponding current phase.
An injection molding machine having a control unit, wherein the control unit controls an AC motor having a plurality of sets of three-phase windings, comprising:
- a plurality of three-phase inverters individually connected to said plurality of sets of three-phase winding, and a plurality of servo controllers individually connected to said plurality of three-phase inverters;
- wherein each of said plurality of three-phase inverters has first self-diagnosing means;
- said first self-diagnosing means, when detection abnormality, issues a first abnormality signal to said servo controller connected to said three-phase inverter having the first self-diagnosing means having detected said abnormality;
- and
- upon receipt of said first abnormality signal, said servo controller transfers said first abnormality signal to the servo controllers.
An injection molding machine having a control unit, wherein the control unit controls an AC motor having a six-phase winding, comprising of:
- a plurality of three-phase inverters connected to said six-phase winding, respectively, and
- a plurality of servo controllers connected to said plurality of three-phase inverters, respectively, and
- said plurality of servo controllers being connected through a signal line so that a drive current phase fed from said plurality of three-phase inverter to said six-phase winding coincides with a corresponding current phase.
An injection molding machine having a control unit, wherein the control unit controls an AC motor having a six-phase winding, comprising:
- a plurality of three-phase inverters individually connected to a plurality of sets of three-phase windings configured to form said six-phase winding, and a plurality of servo controllers individually connected to said plurality of three-phase inverters;
- wherein each of said plurality of three-phase inverters has first self-diagnosing means;
- said first self-diagnosing means, when detecting abnormality, issues a first abnormality signal to said servo controllers connected to said three-phase inverters having the first self-diagnosing means having detected said abnormality;
- and
- upon receipt of said first abnormality signal, one of said servo controllers transfers said first abnormality signal to another of said servo controllers.
Dependencies are inferred from the claim text.