CN213240435U - Steering pre-judging circuit and device of three-phase asynchronous motor - Google Patents
Steering pre-judging circuit and device of three-phase asynchronous motor Download PDFInfo
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- CN213240435U CN213240435U CN202022077997.4U CN202022077997U CN213240435U CN 213240435 U CN213240435 U CN 213240435U CN 202022077997 U CN202022077997 U CN 202022077997U CN 213240435 U CN213240435 U CN 213240435U
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Abstract
The utility model discloses a three-phase asynchronous motor turns to prejudgement circuit and device. The circuit comprises a power supply, a wiring module, a resistor R1, a zero setting resistor R2, a measuring resistor R3 and a voltage measuring module. The wiring module comprises a first terminal A, a second terminal B and a third terminal C which are correspondingly connected with three leading-out ends of the three-phase asynchronous motor; the first terminal A is connected with the positive electrode of a power supply; the second terminal B is connected with the negative electrode of the power supply; the resistor R1 and the zero setting resistor R2 are connected between the first terminal A and the second terminal B in series, and form a bridge circuit with the motor winding; the third terminal C is connected between the resistor R1 and the zero setting resistor R2 through a measuring resistor R3; the voltage measuring module is connected with a measuring resistor R3 in parallel; the anode of the voltage measuring module is connected between the resistor R1 and the zero setting resistor R2, and the cathode of the voltage measuring module is connected with the third terminal C. After the circuit is connected with a tested motor, the deflection of the voltage measuring module is observed by coiling the motor rotor, and the pre-judgment of the steering before the motor is installed can be realized.
Description
Technical Field
The utility model relates to a three-phase asynchronous motor technical field, more specifically say, relate to a three-phase asynchronous motor turns to prejudgement circuit and device.
Background
The three-phase asynchronous motor is widely applied to dragging various mechanical equipment which often has steering requirements on the motor. For the motor steering identification technology, online identification and offline identification can be theoretically divided. The motor steering on-line recognition is a method for determining a rotating direction by checking a rotating portion of a motor after the motor is powered on and started. The motor steering off-line identification refers to a method for judging the motor steering through a certain instrument under the condition that the motor does not need to be electrified and started. Because the motor off-line steering identification can prejudge the steering of the motor before the wiring of the motor, the wiring correctness of the motor can be ensured at one time, and the technology of the motor off-line steering identification is obviously superior to the motor on-line identification. However, the off-line motor identification technology is rare at present and has little application, so that the most used or traditional on-line motor steering identification is now available.
In general, the motor needs to be separated from the mechanical equipment for the on-line motor steering identification, and the motor can be connected with the mechanical equipment after the steering identification is completed. Therefore, the mechanical equipment cannot be connected for the first time after the motor is installed on the site. When the motor rotates reversely, the power supply is isolated again, and the power supply wiring of the motor is adjusted. The process is complex in flow and consumes manpower and material resources. When the motor of some special structure equipment is inseparable from the equipment, the method of adopting on-line trial steering also has the risk of possibly causing equipment damage.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a three-phase asynchronous motor turns to prejudgement circuit and device is provided.
The utility model provides a technical scheme that its technical problem adopted is: a steering anticipation circuit of a three-phase asynchronous motor is constructed, and comprises:
the direct-current motor zero-setting circuit comprises a direct-current power supply module, a wiring module, a resistor R1 and a zero setting resistor R2 which form a bridge circuit with a motor winding, a measuring resistor R3 for acquiring voltage and a voltage measuring module, wherein the wiring module comprises a first terminal A, a second terminal B and a third terminal C which are respectively and correspondingly connected with three leading-out ends of a three-phase asynchronous motor;
the first terminal A is connected with the positive electrode of the direct-current power supply module;
the second terminal B is connected with the negative electrode of the direct-current power supply module;
the resistor R1 and the zero setting resistor R2 are connected in series between the first terminal A and the second terminal B to form a bridge circuit with the motor winding;
the third terminal C is connected between the resistor R1 and the zero setting resistor R2 through the measuring resistor R3; the voltage measuring module is connected in parallel with the measuring resistor R3, wherein the positive pole of the voltage measuring module is connected between the resistor R1 and the zero setting resistor R2, and the negative pole of the voltage measuring module is connected with the third terminal C.
Preferably, the voltage measuring device further comprises an adjustable voltage dividing resistor R4 capable of adjusting the display sensitivity of the voltage measuring module, and the adjustable voltage dividing resistor R4 is connected between the measuring resistor R3 and a connection node of the resistor R1 and the zero adjusting resistor R2.
Preferably, the motor further comprises a current limiting resistor R0 for limiting the magnitude of current flowing into the motor winding, and the current limiting resistor R0 is connected between the first terminal a and the positive electrode of the dc power supply module.
Preferably, the method further comprises the following steps:
the three-phase asynchronous motor winding head and tail identification circuit comprises a fourth terminal D and a fifth terminal E which are used for being correspondingly connected with known head and tail windings, and a sixth terminal G and a seventh terminal F which are respectively connected with unknown head and tail windings; and the number of the first and second groups,
the selection switch is used for switching the three-phase asynchronous motor winding head and tail identification circuit and the three-phase asynchronous motor steering pre-judgment circuit;
the fourth terminal D is connected with the positive electrode of the direct-current power supply module through the selection switch, and the fifth terminal E is connected with the negative electrode of the direct-current power supply module;
the sixth terminal G is connected to the negative electrode of the voltage measuring module, and the seventh terminal F is connected to the positive electrode of the voltage measuring module.
Preferably, the voltage measuring device further comprises an adjustable voltage dividing resistor R5 capable of adjusting the display sensitivity of the voltage measuring module, and the adjustable voltage dividing resistor R5 is connected between the positive electrode of the voltage measuring module and the seventh terminal F.
Preferably, the test button is further included, and the test button is connected between the selection switch and the fourth terminal D.
Preferably, the voltage measuring module is a pointer type direct current bidirectional voltmeter.
Preferably, the selection switch is a three-gear toggle switch, a bidirectional knife switch or a three-gear change-over switch.
Preferably, the test button is a click normally-open button.
Based on the same conception, the utility model provides a three-phase asynchronous motor turns to prejudgement device, turn to prejudgement circuit including foretell three-phase asynchronous motor.
Implement the utility model discloses a three-phase asynchronous motor turns to prejudgement circuit and device has following beneficial effect:
after a first terminal A, a second terminal B and a third terminal C of a steering pre-judging circuit of the three-phase asynchronous motor are respectively and correspondingly connected with three leading-out ends of a UVW three-phase winding of the three-phase asynchronous motor, the deflection condition of a voltage measuring module is observed through a rotor of the coiling motor, and the steering of the motor can be pre-judged; the circuit can realize the pre-judgment of the steering before the motor is installed, so that the motor can be correctly wired once after being transported to the site, the steering is not required to be determined through on-line steering trial, the workload of wire connection adjustment during on-line steering trial and steering error is saved, and the circuit has practicability and economy.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
FIG. 1 is a schematic diagram of a circuit for pre-judging the steering direction and identifying the head and the tail of a winding of the three-phase asynchronous motor of the utility model;
FIG. 2 is a schematic diagram of a steering anticipation circuit of the three-phase asynchronous motor shown in FIG. 1;
FIG. 3 is a schematic diagram of a head-to-tail identification circuit for the windings of the three-phase asynchronous motor shown in FIG. 1;
FIG. 4 is a schematic diagram of the internal winding arrangement of a three-phase asynchronous motor;
FIG. 5 is a schematic wiring diagram of a steering anticipation circuit for the three-phase asynchronous motor shown in FIG. 4 and the three-phase asynchronous motor shown in FIG. 2;
FIG. 6 is a simplified circuit schematic shown in FIG. 5;
fig. 7 is a schematic wiring diagram of the winding head-to-tail identification circuit of the three-phase asynchronous motor shown in fig. 4 and the three-phase asynchronous motor shown in fig. 3.
In the drawing, 1 is a voltage measuring module, 2 is a selector switch, 3 is a test button, 4 is a known head-tail winding, 5 is an unknown head-tail winding, a current limiting resistor-R0, a resistor-R1, a zero setting resistor-R2, a measuring resistor-R3, an adjustable voltage dividing resistor-R4, an adjustable voltage dividing resistor-R5, a first terminal-A, a second terminal-B, a third terminal-C, a fourth terminal-D, a fifth terminal-E, a sixth terminal-G and a seventh terminal-F.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the following description, in conjunction with the examples and the accompanying drawings, is intended to illustrate the present invention in further detail, and the exemplary embodiments and the description thereof are only used for explaining the present invention, and are not intended to limit the present invention.
Fig. 2 is the utility model discloses a three-phase asynchronous motor turns to and judges circuit schematic diagram in advance, as shown in fig. 2, this three-phase asynchronous motor turns to and judges circuit in advance (hereinafter for short turn to and judge the circuit in advance) and include direct current power module, wiring module, with motor winding form bridge circuit's resistance R1 and zero setting resistance R2, be used for obtaining measuring resistance R3 and the voltage measurement module 1 of voltage. During specific implementation, the wiring module is correspondingly connected with a three-phase winding of a three-phase asynchronous motor, and after the connection is completed, the deflection condition of the voltage measuring module 1 is observed through the coiling motor rotor, so that the motor steering can be judged in advance.
The wiring module comprises a first terminal A, a second terminal B and a third terminal C, and is used for being correspondingly connected with three leading-out ends of a three-phase winding of the three-phase asynchronous motor respectively. It is understood that the first terminal a, the second terminal B and the third terminal C can be used for corresponding connection with the leading-out terminals U1, V1 and W1 of the three-phase winding of the three-phase asynchronous motor. Specifically, the first terminal a is connected with the positive electrode of the direct-current power supply module; the second terminal B is connected with the negative electrode of the direct-current power supply module; the resistor R1 and the zero setting resistor R2 are connected between the first terminal A and the second terminal B in series to form a bridge circuit with the motor winding; the third terminal C is connected between the resistor R1 and the zero setting resistor R2 through a measuring resistor R3; the voltage measuring module 1 is connected in parallel with the measuring resistor R3, wherein the anode of the voltage measuring module 1 is connected between the resistor R1 and the zero setting resistor R2, and the cathode is connected with the third terminal C.
It can be understood that, when the three leading-out ends of the three-phase winding of the motor are connected to the steering pre-judging circuit through the first terminal a, the second terminal B and the third terminal C and the dc power module is turned on, the internal resistance of the two-phase winding in the three-phase winding of the motor, the resistor R1 and the zero setting resistor R2 form a bridge circuit, and at this time, the self resistance value of the bridge circuit can be adjusted through the zero setting resistor R2, so that the bridge circuit is balanced, and the zero setting of the voltage measuring module 1 is realized. Then, through the rotor of the disk motor, in the process of the rotor of the disk motor, the measuring resistor R3 obtains voltage, the voltage measuring module 1 measures the voltage at two ends of the measuring resistor R3, and the steering of the motor is pre-judged by observing the deflection of the voltage measuring module 1.
In this embodiment, the dc power module adopts a battery with a voltage of 3.7V and an internal resistance of 0.9m Ω, and the maximum output current of the battery is 40A, so as to protect an overvoltage of 4.28V and a low voltage of 3.0V, and provide a test power supply for the steering prediction of the motor; the voltage measuring module 1 adopts a pointer type direct current bidirectional voltmeter with 0V in the middle and a measuring range of +/-50 mV, so that the deflection condition of the voltage measuring module 1 can be observed more intuitively; the resistor R1 adopts a resistor of 50 omega 3W, and the zero setting resistor R2 adopts an adjustable resistor of 40-60 omega; the measuring resistance R3 adopts a resistor of 500 omega; the first terminal A, the second terminal B and the third terminal C adopt binding posts so as to facilitate wiring.
Further, the steering pre-judging circuit further comprises an adjustable voltage dividing resistor R4, the adjustable voltage dividing resistor R4 is connected between the measuring resistor R3 and a connecting node of the resistor R1 and the zero adjusting resistor R2, understandably, the adjustable voltage dividing resistor R4 plays a role in voltage division, the adjustable voltage dividing resistor R4 is an adjustable resistor of 0-2K omega, and the voltage at two ends of the measuring resistor R3 is changed by adjusting the resistance value of the adjustable voltage dividing resistor R4, so that the voltage measuring module 1 obtains a relatively proper voltage for displaying, and the effect of adjusting the display sensitivity of the voltage measuring module 1 is achieved.
Further, the steering pre-judging circuit further comprises a current limiting resistor R0, wherein the current limiting resistor R0 is connected between the first terminal A and the positive electrode of the direct-current power supply module and plays a role in limiting current of current flowing into the motor winding. It can be understood that when the steering anticipation circuit is connected to the high-power motor winding, the direct-current resistance of the high-power motor winding is very small, which causes the current flowing into the motor winding to be very large. In this embodiment, the current limiting resistor R0 is a 0.175 Ω 100W resistor, and the current flowing in the motor winding is limited to 20A or less by the setting of the current limiting resistor R0, thereby achieving the effect of protecting the steering anticipation circuit. It can be understood that the current limiting resistor R0 is set to have negligible effect when the steering anticipation circuit is connected to the winding of the low power motor.
It can be understood that the three-phase asynchronous motor can work normally, and it is necessary to ensure that the wiring of the three-phase stator winding is correct, and therefore the pre-judging circuit can also pre-judge the steering under the condition that the three-phase asynchronous motor is correctly wired. The three-phase stator winding (which may be referred to as a three-phase winding for short) of the three-phase asynchronous motor is connected with two wiring modes of a Y type and a delta type, no matter the three-phase winding is connected in the Y type or the delta type, when the power phase sequence correspondingly accessed to the three-phase winding UVW is ABC, the rotation direction of the motor is only determined by the arrangement sequence of the three-phase winding UVW in the motor, wherein the equivalent phase sequence of the power phase sequence ABC comprises three modes of ABC, BCA and CAB.
Fig. 4 is a schematic diagram of an internal winding arrangement of a three-phase asynchronous motor, and as shown in the figure, assuming that the arrangement sequence of windings UVW inside the motor is clockwise, when the phase sequence of a power source correspondingly accessed to the three-phase windings UVW of the three-phase asynchronous motor is ABC, the motor will rotate in the direction of the UVW arrangement sequence, namely clockwise. On the contrary, when the phase sequence of the power supply correspondingly connected to the three-phase winding UVW of the three-phase asynchronous motor is not the ABC phase sequence, the motor rotates in the reverse direction of the UVW arrangement sequence, that is, rotates counterclockwise. When the power supply phase sequence is not ABC phase sequence, the three forms of ACB, BAC and CBA are included.
Therefore, the steering pre-judgment circuit of the embodiment is adopted to pre-judge the steering, and the steering of the motor can be known as long as the arrangement sequence of the three-phase windings UVW of the motor in the motor is known. It will be appreciated that the true phase sequence of the power source may be determined by means of a phase sequence table, which is common knowledge to a person skilled in the art and will not be described in detail herein.
The operation principle of the steering pre-judging circuit of the three-phase asynchronous motor of the present embodiment is explained below with a Y-type wire connection motor, assuming that the three-phase winding UVW of the three-phase asynchronous motor to be tested corresponds to the power supply phase sequence ABC:
assuming that the first terminal a, the second terminal B and the third terminal C of the steering anticipation circuit are correspondingly connected to the leading-out terminals U1, V1 and W1 of the UVW three-phase winding of the motor, the formed circuit diagram is shown in fig. 5, and the simplified circuit diagram is shown in fig. 6.
As shown in fig. 6, when the circuit is completed, the following loop, loop one, will be formed: the positive pole of the direct current power supply module, the current limiting resistor R0, the first terminal A-U phase winding leading-out end U1, the U phase winding internal resistance RU-U phase winding leading-out end U2, the V phase winding leading-out end V2, the V phase winding internal resistance RV-V phase winding leading-out end V1, the second terminal B and the negative pole of the direct current power supply module form a magnetic field inside the motor as shown by an arrow in the motor shown in figure 5.
And a second loop: the positive pole of the direct current power supply module, the current limiting resistor R0, the resistor R1, the zero setting resistor R2 and the negative pole of the direct current power supply module.
In the two loops, the U-phase winding internal resistance RU, the V-phase winding internal resistance RV, the resistor R1 and the zero setting resistor R2 form a bridge circuit, when the resistor R1 × V-phase winding internal resistance RV equals to the zero setting resistor R2 × U-phase winding internal resistance RU, the bridge circuit is balanced, and the voltage measuring module 1 displays no voltage. The zero adjustment of the voltage measurement module 1 is realized by adjusting the resistance of the zero adjustment resistor R2 to balance the bridge.
On the basis, if the rotor of the motor is clockwise turned, namely the turning direction is the same as the arrangement sequence of the motor UVW, the W-phase winding cuts the magnetic field of the rotor anticlockwise, induced electromotive force directed from the W-phase winding leading-out end W1 to the W-phase winding leading-out end W2 is generated in the W-phase winding, namely, the winding leading-out end W2 shows positive polarity, the W-phase winding leading-out end W1 shows negative polarity, the W-phase winding leading-out end W2 flows through the parallel connection of (U-phase winding internal resistance RU + resistance R1) and (V-phase winding internal resistance RV + zero setting resistance R2) and then is connected with the positive pole of the voltage measuring module 1 through the adjustable voltage dividing resistance R4, and the W-phase winding leading-out end W1 is directly connected with the negative pole of the voltage measuring module 1, so that the voltage measuring module 1 is positively biased at. If the rotor of the electrical machine is not clockwise, but counter-clockwise, i.e. the direction of the rotation is opposite to the UVW arrangement of the electrical machine, the voltage measuring module 1 will be back-biased using the above-mentioned analysis method. It will be appreciated that this analytical process is common knowledge to those skilled in the art. It can be understood that clockwise and counterclockwise rotation of the motor rotor can be realized by manually rotating the motor rotating shaft.
It will be appreciated that a delta-connected motor may be equivalent to a Y-connected circuit, and therefore the above conclusions are fully applicable to a delta-connected motor, which is well known to those skilled in the art and will not be described in detail herein.
In this embodiment, the steering pre-judging circuit is adopted, and the steering of the motor can be pre-judged by observing the positive and negative deviation conditions of the voltage measuring module 1 in the test. It can be understood that the first terminal a, the second terminal B and the third terminal C of the steering anticipation circuit are connected to the UVW winding of the motor, and the deflection of the voltage measuring module 1 is observed at the moment of turning the motor rotor. When the voltage measuring module 1 is positively biased, the motor rotates towards the direction of disc motion if the UVW winding of the motor is connected with a power supply according to the ABC phase sequence; when the voltage measuring module 1 is reversely biased, it shows that if the UVW winding of the motor is connected to the power supply according to the ABC phase sequence, the motor will rotate in the reverse direction of the disc motion.
Further, the steering pre-judging circuit of the three-phase asynchronous motor of the present embodiment further includes a winding head and tail identification circuit (hereinafter referred to as a winding head and tail identification circuit) of the three-phase asynchronous motor, as shown in fig. 1 and fig. 3, the winding head and tail identification circuit includes a fourth terminal D, a fifth terminal E, a sixth terminal G, and a seventh terminal F, it can be understood that the fourth terminal D and the fifth terminal E are respectively used for being correspondingly connected with the winding head end and the tail end of the known head and tail winding 4, and the sixth terminal G and the seventh terminal F are respectively used for being connected with two ends of the unknown head and tail winding 5. Specifically, the fourth terminal D is connected to the positive electrode of the dc power supply module, the fifth terminal E is connected to the negative electrode of the dc power supply module, the sixth terminal G is connected to the negative electrode of the voltage measurement module 1, and the seventh terminal F is connected to the positive electrode of the voltage measurement module 1. The fourth terminal D, the fifth terminal E, the sixth terminal G and the seventh terminal F adopt binding posts, so that wiring is facilitated.
The three-phase asynchronous motor winding direction pre-judging circuit at least comprises a first terminal D, a second terminal D, a direct-current power supply module, a selection switch 2 and a control module, wherein the selection switch 2 is used for switching the three-phase asynchronous motor winding direction pre-judging circuit and the three-phase asynchronous motor winding direction head and tail identifying circuit, the selection switch 2 is connected between the fourth terminal D and the positive electrode of the direct-current power supply module, and the selection switch 2 at least comprises a direction-changing identifying gear, a stopping gear and a head and tail identifying gear, so that different circuits. Wherein, the selection switch 2 can be a three-gear button switch, a two-way knife switch or a three-gear change-over switch. As can be understood, when the steering anticipation of the three-phase asynchronous motor is performed, the selection switch 2 is selected to the steering recognition gear to turn on the steering anticipation circuit; when the head and the tail of the three-phase winding are identified, the selector switch 2 is selected to the head and the tail identification gear to switch on the head and the tail identification circuit of the winding.
Further, the winding head and tail identification circuit further comprises an adjustable voltage dividing resistor R5, the adjustable voltage dividing resistor R5 is connected between the positive electrode of the voltage measurement module 1 and the seventh terminal F, and as can be understood, the adjustable voltage dividing resistor R5 plays a role in voltage division, and the adjustable voltage dividing resistor R5 is an adjustable resistor of 20-100 Ω. That is to say, when the selector switch 2 selects the head and tail identification gear and switches on the winding head and tail identification circuit, the voltage at the two ends of the measuring resistor R3 can be changed by adjusting the resistance of the adjustable voltage dividing resistor R5, so that the voltage measuring module 1 obtains a relatively suitable voltage for displaying, and the effect of adjusting the display sensitivity of the voltage measuring module 1 is achieved.
Further, the winding head and tail identification circuit further comprises a test button 3, the test button 3 is connected between the selection switch 2 and the fourth terminal D, and preferably, the test button 3 is a click-to-move normally-open button.
It will be understood that for a phase winding, the designations of the head and tail ends of the winding lead-out wires are opposite, i.e., if one end of the winding lead-out wire is designated as the head end, the other end is the tail end.
For a three-phase asynchronous motor, the motor has three-phase windings, which are generally named by U, V, W in a distinguishing way, and the head ends of the three-phase windings are named as U, V, W by using U1, V1 and W1, and the tail ends of the three-phase windings U, V, W are corresponding U2, V2 and W2. Between the head ends (or tail ends) of the outgoing lines of the three-phase stator windings of the three-phase asynchronous motor, the requirement that the electrical angles are 120 degrees different from each other in space must be met, namely, the electrical angles are 120 degrees different from each other between U1, V1 and W1 (or U2, V2 and W2).
As shown in fig. 4, U1, V1, and W1 in the three-phase asynchronous motor are the head ends of the U, V, W three-phase winding, U2, V2, and W2 are the tail ends of the U, V, W three-phase winding, assuming that the head end of any one phase winding is connected to the positive electrode of the dc power module and the tail end is connected to the negative electrode of the dc power module, at the moment when the winding head and tail identification circuit is turned on, a magnetic field having a certain direction from scratch is formed inside the motor, and induced electromotive forces having fixed directions are induced in the other two-phase windings, respectively, according to the principle of electromagnetic induction, so that the direction of the induced electromotive forces can be determined as to which end is the head end and which end is the tail end of the phase winding with respect to which the head and tail ends are known.
The operation principle of the winding head and tail identification circuit of the three-phase asynchronous motor according to the present embodiment will be described below by exciting the U-phase winding and analyzing the induced electromotive force generated by the V-phase winding at the moment when the winding head and tail identification circuit is turned on, and the test wiring is as shown in fig. 7.
Connecting a head end U1 of the U-phase winding with a fourth terminal D, connecting a tail end U2 of the U-phase winding with a fifth terminal E, and forming a sudden increase magnetic field in the motor from the absence to the presence in the direction shown by an arrow in the figure at the moment that a winding head and tail identification circuit is switched on, and according to the electromagnetic induction principle, judging that the induced electromotive force direction of the V-phase winding in the figure 7 is that a head end V1 of the V-phase winding points to a tail end V2 of the V-phase winding, namely, for an external circuit, the tail end V2 of the V-phase winding shows a positive polarity, and the head end V1 of the V-phase winding shows a negative polarity, if the V-phase winding at the moment is externally connected with a voltage measurement module 1, as shown in figure 7, when a tail end V2 of the V-phase winding is connected with a positive pole of the voltage measurement module 1, and a head end V1 of the V-phase; conversely, when the tail end V2 of the V-phase winding is connected to the negative electrode of the voltage measuring module 1 and the head end V1 of the V-phase winding is connected to the positive electrode of the voltage measuring module 1, the voltage measuring module 1 is biased reversely. Therefore, the property of the winding leading-out end connected to the positive pole or the negative pole of the voltage measuring module 1 can be directly identified through the positive and negative bias conditions of the voltage measuring module 1.
It can be understood that, by connecting the head end of the known head-tail winding 4 with the fourth terminal D and the tail end with the fifth terminal E, the two ends of the unknown head-tail winding 5 are arbitrarily connected with the sixth terminal G and the seventh terminal F, respectively, and the test wiring is completed. Selecting a head-tail identification gear of the selector switch 2, switching on the direct-current power supply module, switching on a winding head-tail identification circuit at the moment of pressing the test button 3, and when the voltage measurement module 1 is positively biased, indicating that one end connected to the seventh terminal F is the tail end of the phase winding and one end connected to the sixth terminal G is the head end of the phase winding; when the voltage measuring module 1 is reversely biased, one end connected to the seventh terminal F of the voltage measuring module 1 is the head end of the phase, and one end connected to the sixth terminal G is the tail end of the phase winding. It is understood that the same applies to the identification of the heads and tails of the W-phase windings.
Except that above-mentioned three-phase asynchronous motor turns to and judges the circuit in advance, the utility model also provides a three-phase asynchronous motor turns to and judges the device in advance, should turn to and judge the device in advance and include that the aforesaid turns to and judges the circuit in advance.
The utility model provides a three-phase asynchronous motor turns to and judges circuit and device in advance utilizes the position of arranging of three-phase asynchronous motor three-phase winding, through letting in the direct current to the winding, establishes the definite magnetic field, then coils the electric motor rotor, utilizes the induced electricity electromotive force direction that produces in the winding to judge three-phase asynchronous motor's direction of rotation. The steering pre-judging circuit can be used for confirming the steering of the motor after the motor is newly installed, disassembled, overhauled, replaced and disconnected, and can realize the accurate pre-recognition of the off-line steering of the three-phase asynchronous motor, so that the motor can be correctly wired on site, the steering is not required to be determined in an on-line steering test mode, the steering test flow of the motor is simplified, the manpower and material resources are saved, and the production efficiency is improved.
In addition, the head and tail identification circuit of the three-phase asynchronous motor winding can be used for judging the head and the tail of the winding when the head and the tail of the three-phase asynchronous motor winding are disordered, and has the characteristic of simple and convenient use.
It is to be understood that the foregoing examples merely represent preferred embodiments of the present invention, and that the description thereof is more specific and detailed, but not intended to limit the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (10)
1. A steering anticipation circuit for a three-phase asynchronous motor, comprising:
the device comprises a direct-current power supply module, a wiring module, a resistor R1 and a zero setting resistor R2 which form a bridge circuit with a motor winding, a measuring resistor R3 for acquiring voltage and a voltage measuring module (1), wherein the wiring module comprises a first terminal A, a second terminal B and a third terminal C which are respectively and correspondingly connected with three leading-out ends of a three-phase asynchronous motor;
the first terminal A is connected with the positive electrode of the direct-current power supply module;
the second terminal B is connected with the negative electrode of the direct-current power supply module;
the resistor R1 and the zero setting resistor R2 are connected in series between the first terminal A and the second terminal B to form a bridge circuit with the motor winding;
the third terminal C is connected between the resistor R1 and the zero setting resistor R2 through the measuring resistor R3; the voltage measuring module (1) is connected in parallel with the measuring resistor R3, wherein the positive pole of the voltage measuring module (1) is connected between the resistor R1 and the zero setting resistor R2, and the negative pole is connected with the third terminal C.
2. The steering anticipation circuit of a three-phase asynchronous motor according to claim 1, wherein:
the voltage measuring circuit also comprises an adjustable voltage dividing resistor R4 capable of adjusting the display sensitivity of the voltage measuring module (1), and the adjustable voltage dividing resistor R4 is connected between the measuring resistor R3 and a connection node of the resistor R1 and the zero adjusting resistor R2.
3. The steering anticipation circuit of a three-phase asynchronous motor according to claim 1, wherein:
the direct current motor further comprises a current limiting resistor R0 for limiting the magnitude of current flowing into the motor winding, and the current limiting resistor R0 is connected between the first terminal A and the positive electrode of the direct current power supply module.
4. The steering anticipation circuit of a three-phase asynchronous motor according to claim 1, further comprising:
the three-phase asynchronous motor winding head and tail identification circuit comprises a fourth terminal D and a fifth terminal E which are correspondingly connected with a known head and tail winding (4), and a sixth terminal G and a seventh terminal F which are respectively connected with an unknown head and tail winding (5); and the number of the first and second groups,
a selection switch (2) for switching the three-phase asynchronous motor winding head and tail identification circuit and the three-phase asynchronous motor steering pre-judging circuit;
the fourth terminal D is connected with the positive electrode of the direct-current power supply module through the selection switch (2), and the fifth terminal E is connected with the negative electrode of the direct-current power supply module;
the sixth terminal G is connected with the negative electrode of the voltage measuring module (1), and the seventh terminal F is connected with the positive electrode of the voltage measuring module (1).
5. The steering anticipation circuit of a three-phase asynchronous motor according to claim 4, wherein:
the voltage measuring device further comprises an adjustable voltage dividing resistor R5 capable of adjusting the display sensitivity of the voltage measuring module (1), and the adjustable voltage dividing resistor R5 is connected between the anode of the voltage measuring module (1) and the seventh terminal F.
6. The steering anticipation circuit of a three-phase asynchronous motor according to claim 4, wherein:
the testing device further comprises a testing button (3), wherein the testing button (3) is connected between the selection switch (2) and the fourth terminal D.
7. The steering anticipation circuit of a three-phase asynchronous motor according to claim 1, wherein:
the voltage measuring module (1) is a pointer type direct current bidirectional voltmeter.
8. The steering anticipation circuit of a three-phase asynchronous motor according to claim 4, wherein:
the selection switch (2) is a three-gear button switch, a two-way knife switch or a three-gear change-over switch.
9. The steering anticipation circuit of a three-phase asynchronous motor according to claim 6, wherein:
the test button (3) is a inching normally-open button.
10. A steering anticipation device for a three-phase asynchronous motor, comprising the steering anticipation circuit for a three-phase asynchronous motor according to any one of claims 1 to 9.
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| CN114499318A (en) * | 2022-01-11 | 2022-05-13 | 中广核工程有限公司 | Three-phase asynchronous motor steering pre-test method |
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| CN114499318A (en) * | 2022-01-11 | 2022-05-13 | 中广核工程有限公司 | Three-phase asynchronous motor steering pre-test method |
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