CN112737423B - Motor control circuit and control method of numerical control machine tool - Google Patents
Motor control circuit and control method of numerical control machine tool Download PDFInfo
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- CN112737423B CN112737423B CN202011541135.0A CN202011541135A CN112737423B CN 112737423 B CN112737423 B CN 112737423B CN 202011541135 A CN202011541135 A CN 202011541135A CN 112737423 B CN112737423 B CN 112737423B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Control Of Multiple Motors (AREA)
Abstract
The invention relates to a motor control circuit and a motor control method of a numerical control machine tool, comprising the following steps that a numerical control system sends out a signal for enabling any variable frequency motor to work, and a first control circuit connected with an outlet end of a frequency converter reacts according to the signal to enable the corresponding variable frequency motor to be in a to-be-operated state and enable the other variable frequency motor to be in a non-energized state; the numerical control system sends out an action signal for enabling the variable frequency motor to rotate forward or reversely, and a second control circuit connected with the forward and reverse rotation signal end of the frequency converter reacts according to the signal to output the action signal; the corresponding variable frequency motor acts according to the action signal, including forward rotation and reverse rotation. The invention has compact structure and low production cost, and the safety of the circuit in operation is ensured by using the alternating current contactor with mechanical interlocking and electrically interlocking the relay and the alternating current contactor.
Description
Technical Field
The invention belongs to the field of numerical control machine tools, and particularly relates to a motor control circuit and a motor control method of a numerical control machine tool.
Background
The numerical control machine tool is an automatic machine tool provided with a control system. The control system can logically process and decode programs with control codes or other symbol instructions, input the programs into a numerical control device through an information carrier, send various control signals through the numerical control device through operation processing, control the action of a machine tool and automatically process parts according to the shape and the size required by drawings. At present, a numerical control machine tool is provided with a plurality of motors according to needs, one motor needs a frequency converter to control, namely, how many motors need how many frequency converters to control, under most conditions, a plurality of motors in the same numerical control machine tool do not work simultaneously, under the conditions, each motor is controlled by a single frequency converter to cause the increase of the production cost of the numerical control machine tool, the waste of the installation space in the numerical control machine tool is increased, or the occupied area of the numerical control machine tool is enlarged.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and thus provides a motor control circuit and a motor control method of a numerical control machine tool.
The technical scheme adopted for solving the technical problems is as follows:
A motor control circuit of a numerical control machine, comprising: variable frequency motor M1 and variable frequency motor M2; the frequency converter A1 is electrically connected with an external power supply and is in signal connection with the numerical control system; the relay KA1 is connected with an external power supply; the alternating-current contactor KM1 and the alternating-current contactor KM2 are sequentially connected, the variable-frequency motor M1, the normally open contact of the alternating-current contactor KM1 and the outlet end of the frequency converter A1 are sequentially connected, the variable-frequency motor M2, the normally open contact of the alternating-current contactor KM2 and the outlet end of the frequency converter A1 are sequentially connected, the normally open contact of the relay KA1, the normally closed contact of the alternating-current contactor KM1 and the coil of the alternating-current contactor KM2 are sequentially connected, and the normally closed contact of the relay KA1, the normally closed contact of the alternating-current contactor KM2 and the coil of the alternating-current contactor KM1 are sequentially connected; the relay KA2 and the relay KA3 are sequentially connected with the FWD end of the frequency converter A1, the normally-open contact of the relay KA2, the normally-closed contact of the relay KA3 and the COM end of the frequency converter A1, and the REV end of the frequency converter A1, the normally-open contact of the relay KA3, the normally-closed contact of the relay KA2 and the COM end of the frequency converter A1 are sequentially connected with each other; wherein the first control circuit includes: the variable frequency motor M1, the normally open contact of the alternating current contactor KM1 and the outlet end of the frequency converter A1 are sequentially connected, the variable frequency motor M2, the normally open contact of the alternating current contactor KM2 and the outlet end of the frequency converter A1 are sequentially connected, the normally open contact of the relay KA1, the normally closed contact of the alternating current contactor KM1 and the coil of the alternating current contactor KM2 are sequentially connected, and the normally closed contact of the relay KA1, the normally closed contact of the alternating current contactor KM2 and the coil of the alternating current contactor KM1 are sequentially connected; the second control circuit includes: the relay KA2 and the relay KA3 are sequentially connected with the FWD end of the frequency converter A1, the normally-open contact of the relay KA2, the normally-closed contact of the relay KA3 and the COM end of the frequency converter A1, and the REV end of the frequency converter A1, the normally-open contact of the relay KA3, the normally-closed contact of the relay KA2 and the COM end of the frequency converter A1 are sequentially connected with each other;
the motor control method of the motor control circuit of the numerical control machine tool comprises the following steps:
A. The numerical control system sends out a signal for enabling any variable frequency motor to work, and a first control circuit connected with the outlet end of the variable frequency motor reacts according to the signal to enable the corresponding variable frequency motor to be in a to-be-operated state and enable the other variable frequency motor to be in a non-energized state;
B. The numerical control system sends out an action signal for enabling the variable frequency motor in a to-be-operated state to rotate forward or reversely, and a second control circuit connected with the forward and reverse rotation signal end of the frequency converter reacts according to the action signal to output an action control signal;
C. The corresponding variable frequency motor acts according to the action control signal, including forward rotation and reverse rotation.
Further, the frequency converter further comprises a brake resistor R, and the brake resistor R is connected between the P+ end and the PB end of the frequency converter A1.
The motor control method of the motor control circuit of the numerical control machine tool comprises a frequency converter A1, a first control circuit connected with an outlet end of the frequency converter, a variable frequency motor M1 and a variable frequency motor M2 connected with the first control circuit, and a second control circuit connected with a forward and reverse rotation signal end of the frequency converter, and comprises the following steps:
A. The numerical control system sends out a signal for enabling any variable frequency motor to work, and a first control circuit connected with the outlet end of the variable frequency motor reacts according to the signal to enable the corresponding variable frequency motor to be in a to-be-operated state and enable the other variable frequency motor to be in a non-energized state;
B. The numerical control system sends out an action signal for enabling the variable frequency motor in a to-be-operated state to rotate forward or reversely, and a second control circuit connected with the forward and reverse rotation signal end of the frequency converter reacts according to the action signal to output an action control signal;
C. The corresponding variable frequency motor acts according to the action control signal, including forward rotation and reverse rotation.
Further, in the step a, the first control circuit reacts according to the signal, when the signal is that the variable frequency motor M1 works, the relay KA1 is powered off, the normally closed contact of the relay KA1, the normally closed contact of the ac contactor KM2 and the coil of the ac contactor KM1 form a path, the coil of the ac contactor KM1 is powered on, the ac contactor KM1 is attracted, and the variable frequency motor M1 is communicated with the variable frequency motor A1; when the signal is that the variable frequency motor M2 works, the relay KA1 is electrified, the normally open contact of the relay KA1 is attracted, a normally closed contact of the relay KA1, the normally closed contact of the alternating current contactor KM1 and the coil of the alternating current contactor KM2 form a passage, the coil of the alternating current contactor KM2 is attracted after being electrified, and the variable frequency motor M2 is communicated with the variable frequency motor A1.
Further, in the step B, the second control circuit reacts according to the action signal, when the action signal is positive rotation, the normally open contact of the relay KA2 is closed, the FWD end of the frequency converter A1, the normally open contact of the relay KA2 and the normally closed contact of the relay KA3 form a passage, and the FWD end of the frequency converter A1 outputs a positive rotation signal; when the operation signal is inverted, the normally open contact of the relay KA3 is closed, and the REV end of the inverter A1, the normally open contact of the relay KA3, and the normally closed contact of the relay KA2 form a path, and the REV end of the inverter A1 outputs the inverted signal.
Further, the motor control method of the motor control circuit of the numerical control machine tool further comprises the following steps:
D. The numerical control system sends a stop signal, and a second control circuit connected with the forward and reverse rotation signal end of the frequency converter reacts according to the stop signal, and the action control signal stops outputting.
Further, in the step D, the second control circuit reacts according to the stop signal, including that when the inverter motor in the action is in forward rotation, the normally open contact of the relay KA2 is opened, and the FWD end of the inverter A1, the normally open contact of the relay KA2 and the normally closed contact of the relay KA3 form an open circuit; when the inverter motor in this operation is in reverse rotation, the normally open contact of the relay KA3 is opened, and the FWD end of the inverter A1, the normally open contact of the relay KA2, and the normally closed contact of the relay KA3 are opened, so that the REV end of the inverter A1, the normally open contact of the relay KA3, and the normally closed contact of the relay KA2 are opened.
Compared with the prior art, the invention has the following advantages and effects: the structure is compact, and the production cost is lower; through setting up two alternating current contactor that take mechanical interlocking, only need a converter can control two inverter motor's operating condition (corotation, reversal, stop) respectively, and even have an alternating current contactor adhesion to use the alternating current contactor KM1 that takes mechanical interlocking and alternating current contactor KM2, also can guarantee that alternating current contactor KM1 and alternating current contactor KM2 can not suction simultaneously, carry out electric interlocking through relay KA1 and alternating current contactor simultaneously, make the security of this circuit control method when the operation obtain guarantee.
Drawings
Fig. 1 is a schematic circuit diagram of an embodiment of the present invention.
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings.
The motor control method of the numerical control machine tool comprises a frequency converter A1 connected with a numerical control system, a first control circuit connected with an outlet end of the frequency converter A1, a variable frequency motor M1 and a variable frequency motor M2 connected with the first control circuit, and a second control circuit connected with a forward and reverse rotation signal end of the frequency converter A1. The motor control method comprises the following steps:
A. The numerical control system sends out a signal for enabling any variable frequency motor to work, and a first control circuit connected with an outlet end of the frequency converter A1 reacts according to the signal to enable the corresponding variable frequency motor to be in a to-be-operated state and enable the other variable frequency motor to be in a non-energized state;
B. The numerical control system sends out an action signal for enabling the variable frequency motor to rotate forward or reversely, and a second control circuit connected with the forward and reverse rotation signal end of the frequency converter A1 reacts according to the signal to output an action signal;
C. The corresponding variable frequency motor acts according to the action signal, including forward rotation and reverse rotation;
D. The numerical control system sends out a stop signal, and a second control circuit connected with the forward and reverse rotation signal end of the frequency converter reacts according to the signal, and the action signal stops outputting.
The first control circuit includes a relay KA1, an ac contactor KM1, and an ac contactor KM2. The relay KA1 is connected with an external power supply, the variable frequency motor M1, the normally open contact of the alternating current contactor KM1 and the outlet end of the frequency converter A1 are sequentially connected, the variable frequency motor M2, the normally open contact of the alternating current contactor KM2 and the outlet end of the frequency converter A1 are sequentially connected, the normally open contact of the relay KA1, the normally closed contact of the alternating current contactor KM1 and the coil of the alternating current contactor KM2 are sequentially connected, and the normally closed contact of the relay KA1, the normally closed contact of the alternating current contactor KM2 and the coil of the alternating current contactor KM1 are sequentially connected.
In step a, the reaction of the first control circuit according to the signal sent by the numerical control system includes:
1. when the signal is that variable frequency motor M1 works, relay KA1 loses electricity, and the normally closed contact of relay KA1, the normally closed contact of alternating current contactor KM2, the coil formation route of alternating current contactor KM1, alternating current contactor KM1 actuation after the coil circular telegram of alternating current contactor KM1, motor M1 and converter A1 intercommunication, at this moment, normally open contact, the normally closed contact of alternating current contactor KM1, the coil formation circuit breaker of alternating current contactor KM2 of relay KA1, motor M2 and converter A1 disconnection.
2. When the signal is the variable frequency motor M2 during operation, the relay KA1 is powered on, the normally open contact of the relay KA1 is attracted, the normally open contact of the relay KA1, the normally closed contact of the alternating current contactor KM1 and the coil of the alternating current contactor KM2 form a passage, the coil of the alternating current contactor KM2 is attracted after being electrified, the motor M2 is communicated with the frequency converter, at the moment, the normally closed contact of the relay KA1, the normally closed contact of the alternating current contactor KM2 and the coil of the alternating current contactor KM1 form an open circuit, and the motor M1 is disconnected with the frequency converter A1.
The second control circuit comprises a relay KA2 and a relay KA3, wherein the FWD end of the frequency converter A1, the normally-open contact of the relay KA2, the normally-closed contact of the relay KA3 and the COM end of the frequency converter are sequentially connected, and the REV end of the frequency converter, the normally-open contact of the relay KA3, the normally-closed contact of the relay KA2 and the COM end of the frequency converter are sequentially connected.
In step B, the second control circuit reacting according to the signal comprises:
1. When the signal is forward rotation, the normally open contact of the relay KA2 is closed, the FWD end of the frequency converter, the normally open contact of the relay KA2 and the normally closed contact of the relay KA3 form a passage, the FWD end of the frequency converter outputs forward rotation signals, and the variable frequency motor rotates forward according to the action signals.
2. When the signal is reverse rotation, the normally open contact of the relay KA3 is closed, the REV end of the frequency converter, the normally open contact of the relay KA3 and the normally closed contact of the relay KA2 form a passage, the REV end of the frequency converter outputs a reverse rotation signal, and the frequency conversion motor is reversed according to the action signal.
In step D, the second control circuit reacting according to the stop signal comprises:
1. When the variable frequency motor is in forward rotation, the normally open contact of the relay KA2 is disconnected, and the FWD end of the frequency converter, the normally open contact of the relay KA2 and the normally closed contact of the relay KA3 form open circuits.
2. When the variable frequency motor is in reverse rotation, the normally open contact of the relay KA3 is disconnected, the FWD end of the frequency converter, the normally open contact of the relay KA2 and the normally closed contact of the relay KA3 form open circuits, and the REV end of the frequency converter, the normally open contact of the relay KA3 and the normally closed contact of the relay KA2 form open circuits.
According to the motor control method of the numerical control machine, through arranging two alternating current contactors with mechanical interlocking, the working states (forward rotation, reverse rotation and stop) of the two variable frequency motors can be controlled respectively only by one frequency converter, and even if one alternating current contactor is adhered, the alternating current contactor KM1 and the alternating current contactor KM2 can not be simultaneously attracted, and meanwhile, the electric interlocking is carried out through the relay KA1 and the alternating current contactor, so that the safety of the circuit control method in operation is ensured.
Examples
As shown in fig. 1, a motor control circuit based on the numerical control machine tool comprises a variable frequency motor M1, a variable frequency motor M2, a frequency converter A1, a relay KA2, a relay KA3, an ac contactor KM1 and an ac contactor KM2.
The frequency converter A1 is electrically connected with an external power supply, is in signal connection with the numerical control system, and the relay KA1 is connected with the external power supply; the variable frequency motor M1, the normally open contact of the alternating current contactor KM1 and the outlet end of the frequency converter A1 are sequentially connected, the variable frequency motor M2, the normally open contact of the alternating current contactor KM2 and the outlet end of the frequency converter A1 are sequentially connected, the normally open contact of the relay KA1, the normally closed contact of the alternating current contactor KM1 and the coil of the alternating current contactor KM2 are sequentially connected, the normally closed contact of the relay KA1, the normally closed contact of the alternating current contactor KM2 and the coil of the alternating current contactor KM1 are sequentially connected, the FWD end of the frequency converter A1, the normally open contact of the relay KA2, the normally closed contact of the frequency converter A1 and the COM end of the frequency converter A1 are sequentially connected, and the REV end of the frequency converter A1, the normally open contact of the relay KA3, the COM end of the frequency converter A1 are sequentially connected.
In this embodiment, the frequency converter A1 is further connected with a brake resistor R, where the brake resistor R is connected between the p+ end and the PB end of the frequency converter A1, and the set brake resistor R is used as a carrier for absorbing heat generated by inertial motion of the frequency converter motor when receiving a stop signal, so as to help the frequency converter motor to stop rapidly and avoid loss of the frequency converter motor.
According to the motor control circuit of the numerical control machine, the operation of the two variable frequency motors is controlled by the frequency converter through arranging the relay and the two alternating current contactors with mechanical interlocking, so that the production cost of the traditional numerical control machine can be further reduced, the occupied area is reduced, and meanwhile, the safety is better.
The foregoing description of the invention is merely exemplary of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions, without departing from the scope of the invention as defined in the accompanying claims.
Claims (7)
1. A motor control circuit of a numerical control machine, comprising:
variable frequency motor M1 and variable frequency motor M2;
The frequency converter A1 is electrically connected with an external power supply and is in signal connection with the numerical control system;
The relay KA1 is connected with an external power supply;
The alternating-current contactor KM1 and the alternating-current contactor KM2 are sequentially connected, the variable-frequency motor M1, the normally open contact of the alternating-current contactor KM1 and the outlet end of the frequency converter A1 are sequentially connected, the variable-frequency motor M2, the normally open contact of the alternating-current contactor KM2 and the outlet end of the frequency converter A1 are sequentially connected, the normally open contact of the relay KA1, the normally closed contact of the alternating-current contactor KM1 and the coil of the alternating-current contactor KM2 are sequentially connected, and the normally closed contact of the relay KA1, the normally closed contact of the alternating-current contactor KM2 and the coil of the alternating-current contactor KM1 are sequentially connected;
The relay KA2 and the relay KA3 are sequentially connected with the FWD end of the frequency converter A1, the normally-open contact of the relay KA2, the normally-closed contact of the relay KA3 and the COM end of the frequency converter A1, and the REV end of the frequency converter A1, the normally-open contact of the relay KA3, the normally-closed contact of the relay KA2 and the COM end of the frequency converter A1 are sequentially connected with each other;
wherein the first control circuit includes: the variable frequency motor M1, the normally open contact of the alternating current contactor KM1 and the outlet end of the frequency converter A1 are sequentially connected, the variable frequency motor M2, the normally open contact of the alternating current contactor KM2 and the outlet end of the frequency converter A1 are sequentially connected, the normally open contact of the relay KA1, the normally closed contact of the alternating current contactor KM1 and the coil of the alternating current contactor KM2 are sequentially connected, and the normally closed contact of the relay KA1, the normally closed contact of the alternating current contactor KM2 and the coil of the alternating current contactor KM1 are sequentially connected;
The second control circuit includes: the relay KA2 and the relay KA3 are sequentially connected with the FWD end of the frequency converter A1, the normally-open contact of the relay KA2, the normally-closed contact of the relay KA3 and the COM end of the frequency converter A1, and the REV end of the frequency converter A1, the normally-open contact of the relay KA3, the normally-closed contact of the relay KA2 and the COM end of the frequency converter A1 are sequentially connected with each other;
the motor control method of the motor control circuit of the numerical control machine tool comprises the following steps:
A. The numerical control system sends out a signal for enabling any variable frequency motor to work, and a first control circuit connected with the outlet end of the variable frequency motor reacts according to the signal to enable the corresponding variable frequency motor to be in a to-be-operated state and enable the other variable frequency motor to be in a non-energized state;
B. The numerical control system sends out an action signal for enabling the variable frequency motor in a to-be-operated state to rotate forward or reversely, and a second control circuit connected with the forward and reverse rotation signal end of the frequency converter reacts according to the action signal to output an action control signal;
C. The corresponding variable frequency motor acts according to the action control signal, including forward rotation and reverse rotation.
2. The motor control circuit of a numerical control machine according to claim 1, wherein: the motor also comprises a brake resistor R, wherein the brake resistor R is connected between the P+ end and the PB end of the frequency converter A1.
3. A motor control method based on the motor control circuit of the numerical control machine tool according to any one of claims 1-2, comprising a frequency converter A1, a first control circuit connected with the outlet end of the frequency converter, a variable frequency motor M1 and a variable frequency motor M2 connected with the first control circuit, and a second control circuit connected with the forward and reverse rotation signal end of the frequency converter, comprising the following steps:
A. The numerical control system sends out a signal for enabling any variable frequency motor to work, and a first control circuit connected with the outlet end of the variable frequency motor reacts according to the signal to enable the corresponding variable frequency motor to be in a to-be-operated state and enable the other variable frequency motor to be in a non-energized state;
B. The numerical control system sends out an action signal for enabling the variable frequency motor in a to-be-operated state to rotate forward or reversely, and a second control circuit connected with the forward and reverse rotation signal end of the frequency converter reacts according to the action signal to output an action control signal;
C. The corresponding variable frequency motor acts according to the action control signal, including forward rotation and reverse rotation.
4. A motor control method of a motor control circuit of a numerical control machine according to claim 3, characterized in that: in the step A, the first control circuit reacts according to the signal, when the signal is that the variable frequency motor M1 works, the relay KA1 is powered off, a normally closed contact of the relay KA1, a normally closed contact of the alternating current contactor KM2 and a coil of the alternating current contactor KM1 form a passage, the alternating current contactor KM1 is attracted after the coil of the alternating current contactor KM1 is electrified, and the variable frequency motor M1 is communicated with the variable frequency motor A1;
When the signal is that the variable frequency motor M2 works, the relay KA1 is electrified, the normally open contact of the relay KA1 is attracted, a normally closed contact of the relay KA1, the normally closed contact of the alternating current contactor KM1 and the coil of the alternating current contactor KM2 form a passage, the coil of the alternating current contactor KM2 is attracted after being electrified, and the variable frequency motor M2 is communicated with the variable frequency motor A1.
5. The motor control method of the motor control circuit of the numerical control machine according to claim 4, characterized in that: in the step B, the second control circuit reacts according to the action signal, wherein when the action signal is positive rotation, the normally open contact of the relay KA2 is closed, the FWD end of the frequency converter A1, the normally open contact of the relay KA2 and the normally closed contact of the relay KA3 form a passage, and the FWD end of the frequency converter A1 outputs a positive rotation signal;
When the operation signal is inverted, the normally open contact of the relay KA3 is closed, and the REV end of the inverter A1, the normally open contact of the relay KA3, and the normally closed contact of the relay KA2 form a path, and the REV end of the inverter A1 outputs the inverted signal.
6. A motor control method of a motor control circuit of a numerical control machine according to claim 3, further comprising the steps of:
D. The numerical control system sends a stop signal, and a second control circuit connected with the forward and reverse rotation signal end of the frequency converter reacts according to the stop signal, and the action control signal stops outputting.
7. The motor control method of the motor control circuit of the numerical control machine according to claim 6, characterized in that: in the step D, the second control circuit reacts according to the stop signal, and comprises that when the frequency conversion motor in the action is in forward rotation, the normally open contact of the relay KA2 is disconnected, and the FWD end of the frequency converter A1, the normally open contact of the relay KA2 and the normally closed contact of the relay KA3 form an open circuit;
When the inverter motor in this operation is in reverse rotation, the normally open contact of the relay KA3 is opened, and the FWD end of the inverter A1, the normally open contact of the relay KA2, and the normally closed contact of the relay KA3 are opened, so that the REV end of the inverter A1, the normally open contact of the relay KA3, and the normally closed contact of the relay KA2 are opened.
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| CN202011541135.0A CN112737423B (en) | 2020-12-23 | 2020-12-23 | Motor control circuit and control method of numerical control machine tool |
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