Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Patent
1990-01-10
1992-03-03
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
318625, G05B 1918
Patent
active
050936085
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a motor control apparatus in which, when a machine tool controlled by a numerical control unit or the like employs a large variety of motor models, control parameters corresponding to these motor models can be set and changed externally.
2. Background Art
In an ordinary numerical control unit, control parameters regarding acceleration, rapid-traverse velocity and the like are entered from, say, an MDI/DPL unit in accordance with the motor model which is the object of control, and the control parameters corresponding to the motor control apparatus are set before the machine tool starts operating. These parameters are set in addition to the program which applies control commands to the machine tool. Since machine tools controlled by a numerical control unit or the like often employ a wide variety of motor models at the same time, it is necessary to set accurate control parameters corresponding to each of these motor models, and it is essential to maintain universality of numerical control in the motor control apparatus.
The operation for setting the control parameters by means of the conventional numerical control unit requires that tens of control parameters be specified for each type of motor model and that these parameters be set in the motor control apparatus. Since the procedure for setting these control parameters usually is a manual task performed by the operator, there is the possibility that an accident can be caused due to erroneous setting of the control parameters. Further, in a case where the control parameters are set in an NC tape along with a machining program without relying upon a manual operation, it is possible to read the parameters automatically and set them in the motor control apparatus before the program is run. However, even in this case it is necessary to accurately detect agreement between the motor model to be controlled and the machining program, and erroneous settings sometimes occur.
SUMMARY OF THE INVENTION
The present invention has been devised in order to solve these problems and its object is to provide a motor control apparatus in which the operation for recognizing the type of motor model is automated and accidents caused by erroneous setting of control parameters are reliably prevented.
In accordance with the present invention, there can be provided a motor control apparatus for controlling motors having different control parameters, in which the control parameters can be set and changed externally and a large variety of motor models are capable of being controlled selectively, characterized by comprising registering means in which a specific model code representing the control parameters of a respective motor model is registered in selecting any of the motors, memory means for temporarily storing the set control parameters as well as a model code transferred along with the control parameters, and comparing means for comparing the model code registered in the registering means with the transferred model code.
The motor control apparatus of the present invention is such that the model code of a motor model to be controlled is registered and agreement is obtained between this code and the model code stored in memory at the same time as the transferred control parameters. As a result, the operator is capable of identifying the motor model with assurance.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram illustrating an embodiment of the invention, and FIG. 2 is a view illustrating an operating flow for identifying a motor model.
DESCRIPTION OF THE PREFERRED EMBODIMENT
An embodiment of the present invention will now be described in detail with reference to the drawings.
FIG. 1 is a diagram showing the basic construction of a system which includes an NC unit 1 for forming the control commands of a machine tool.
A motor control apparatus 2 in which control parameters can be variably set in a memory circuit such as a RAM from the outside is provided to correspond to each servomotor 3 of a respective m
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Kono Shinichi
Takahashi Hironobu
Fanuc Ltd.
Ro Bentsu
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