CN207625471U - The startup control system of motor - Google Patents
The startup control system of motor Download PDFInfo
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- CN207625471U CN207625471U CN201721239390.3U CN201721239390U CN207625471U CN 207625471 U CN207625471 U CN 207625471U CN 201721239390 U CN201721239390 U CN 201721239390U CN 207625471 U CN207625471 U CN 207625471U
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Abstract
The utility model discloses a kind of startup control system of motor, which includes first switch module, second switch module, split-phase module and control module；Wherein, the first input end of first switch module is connect with the first direct voltage source, second input terminal of first switch module is connect with the first firewire, the control terminal of first switch module is connect with control module, and the output end of first switch module is connect with the start end of the first end of split-phase module and motor respectively；The first input end of second switch module is connect with the second direct voltage source, second input terminal of second switch module is connect with the second firewire, the control terminal of second switch module is connect with control module, and the output end of second switch module is connect with the operation end of the second end of split-phase module and motor respectively；The public terminal connecting zero line of motor.Using the startup control system of the motor in the utility model embodiment, the operating power consumption of monophase machine can be reduced.
Description
Technical Field
The utility model relates to the technical field of electric machines, especially, relate to a start control system of motor.
Background
A single-phase ac motor is called a single-phase motor for short, and cannot directly generate magnetic field torque under the driving of electromagnetic force, compared with a three-phase motor which can generate magnetic field torque with a difference of 120 ° from each other under the driving of electromagnetic force. In order to generate magnetic field torque, the single-phase motor is provided with a starting winding, a starting capacitor and a starter besides a running winding, wherein the starting winding only participates in the starting work of the single-phase motor; the starting capacitor can generate a phase difference of 90 degrees between currents passing through the starting winding and the running winding, so that magnetic field moments with the phase difference of 90 degrees are generated; the starter can ensure that the starting winding does not participate in the starting work of the single-phase motor any more after the single-phase motor is successfully started.
In the prior art, a PTC (positive temperature coefficient) starter is separately arranged on a motor, the PTC starter is connected with a start winding of a single-phase motor, the PTC starter has low capacitance when starting, the start winding can be switched on to participate in the starting work of the single-phase motor, the capacitance of the PTC starter is increased after starting, the start winding can be switched off by self-breaking after the single-phase motor is successfully started, and the start winding is enabled not to participate in the starting work of the single-phase motor any more.
However, the utility model discloses the people of this application discover, in the course of work after single phase motor successfully starts, the PTC starter needs a weak electric current to maintain the resistance that generates heat of self all the time to maintain itself and open circuit and come the break-off start winding, make start winding no longer participate in single phase motor's start-up work. The PTC starter always generates heat in the working process of the single-phase motor, so that the working energy consumption of the single-phase motor is increased.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a start control system of motor can reduce single phase motor's work energy consumption.
The embodiment of the utility model provides a starting control system of a motor, which comprises a first switch module, a second switch module, a phase splitting module and a control module; wherein,
the first input end of the first switch module is connected with a first direct-current voltage source, the second input end of the first switch module is connected with a first live wire, the control end of the first switch module is connected with the control module, and the output end of the first switch module is respectively connected with the first end of the phase splitting module and the starting end of the motor;
a first input end of the second switch module is connected with a second direct-current voltage source, a second input end of the second switch module is connected with a second live wire, a control end of the second switch module is connected with the control module, and an output end of the second switch module is respectively connected with a second end of the phase splitting module and an operation end of the motor;
the first switch module is configured to provide working voltage to the phase separation module and the starting end of the motor when the motor is started, and stop providing working voltage to the phase separation module and the starting end of the motor after the motor is started successfully;
the second switch module is configured to provide working voltage for the phase separation module and the operation end of the motor when the motor is started, and to continuously provide working voltage for the phase separation module and the operation end of the motor after the motor is successfully started until the motor stops working;
the phase separation module is configured to provide a phase difference of 90 DEG to the voltages of the starting end and the running end of the motor so as to start the motor;
and the common end of the motor is connected with a zero line.
In some embodiments according to the invention, the first switch module comprises a first transistor, a first diode, a first coil component and a first contact component;
the control end of the first transistor is connected with the first output end of the control module, the first end of the first transistor is connected with the input end of the first diode, and the second end of the first transistor is grounded;
the output end of the first diode is connected with the first direct-current voltage source;
the first coil assembly is connected with the first diode in parallel;
the static contact of the first contact assembly is connected with the first live wire, and the movable contact of the first contact assembly is respectively connected with the first end of the phase separation module and the starting end of the motor;
the first transistor is configured to close the movable contact of the first contact assembly upon startup of the motor and to open the movable contact of the first contact assembly upon successful startup of the motor.
In some embodiments according to the invention, the first end of the second switch module comprises a second transistor, a second diode, a second coil component and a second contact component;
the control end of the second transistor is connected with the second output end of the control module, the first end of the second transistor is connected with the input end of the second diode, and the second end of the second transistor is grounded;
the output end of the second diode is connected with the second direct current voltage source;
the second coil assembly is connected in parallel with the second diode;
the static contact of the second contact assembly is connected with the second live wire, and the movable contact of the second contact assembly is respectively connected with the second end of the phase separation module and the running end of the motor;
the second transistor is configured to close the movable contact of the second contact assembly upon start-up of the motor and to maintain the movable contact of the second contact assembly closed after successful start-up of the motor until the motor ceases operation.
In some embodiments according to the present invention, the phase splitting module includes a capacitor, a first end of the capacitor is connected to the output end of the first switch module and the start end of the motor, and a second end of the capacitor is connected to the output end of the second switch module and the operation end of the motor.
In some embodiments according to the present invention, the start control system further comprises a first current limiting resistor, a first end of the first current limiting resistor is connected to the first output terminal of the control module, and a second end of the first current limiting resistor is connected to the control terminal of the first transistor.
In some embodiments according to the present invention, the start control system further comprises a second current limiting resistor, a first end of the second current limiting resistor is connected to the second output terminal of the control module, and a second end of the second current limiting resistor is connected to the control terminal of the second transistor.
In some embodiments according to the present invention, the start control system further comprises a motor protector, the first end of the motor protector is connected to the common terminal of the motor, and the second end of the motor protector is connected to the zero line.
In some embodiments according to the present invention, the first switch module, the second switch module and the control module are integrated on a circuit board.
In some embodiments according to the present invention, the first live wire, the second live wire and the neutral wire are all drawn from the control module.
According to the utility model discloses a when the motor starts, control module can provide operating voltage to the start-up end of phase splitting module and motor through first switch module, provides operating voltage to the operation end of phase splitting module and motor through the second switch module, that is to say, provides the phase difference that has 90 to the voltage of the start-up end of motor and operation end to make the motor start. After the motor is successfully started, the control module can stop providing the working voltage to the phase splitting module and the starting end of the motor through the first switch module, and at the moment, the starting end (namely the starting winding) of the generator does not participate in the starting work of the engine any more. And then the control module continuously provides working voltage to the phase splitting module and the running end of the motor through the second switch module until the motor stops working.
As described above, the embodiment of the present invention controls the connection and disconnection of the start terminal of the motor through the control module, and since the control module can execute the above functions through the preset time sequence program, the PTC starter itself is no longer required to be maintained through weak current, and the start of the generator can no longer participate in the starting operation of the engine, so that the energy consumption of the single-phase motor can be reduced.
Drawings
Embodiments of the present invention may be better understood from the following description of specific embodiments of the embodiments taken in conjunction with the accompanying drawings, in which like or similar reference numerals identify like or similar features.
Fig. 1 is a schematic structural diagram of a start control system of a motor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a start control system of a motor according to another embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of embodiments of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the invention. It will be apparent, however, to one skilled in the art that the embodiments of the invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the embodiments of the present invention by way of example only, and is not intended to limit the invention to the embodiments described herein. The embodiments of the present invention are in no way limited to any specific configurations and algorithms set forth below, but rather cover any modifications, alterations, and improvements in elements, components, and algorithms without departing from the spirit of the embodiments of the present invention. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the embodiments of the invention.
The embodiment of the utility model provides a start control system of motor is applied to single phase motor's start-up in-process. Generally, the starting winding of the motor only participates in the starting of the motor, and the starting winding does not participate in the working of the motor after the motor works normally. A compression motor used in an air conditioner and a refrigerator belongs to a single-phase motor.
Fig. 1 is a schematic structural diagram of a start control system of a motor according to an embodiment of the present invention. As shown in FIG. 1, the starting control system of the motor comprises a first switch module K1, a second switch module K2, an isolated phase module F1 and a control module C1.
The first input end of the first switch module K1 is connected with a first direct-current voltage source VCC1, the second input end of the first switch module K1 is connected with a first live wire L1, the control end of the first switch module K1 is connected with the control module C1, and the output end of the first switch module K1 is connected with the first end of the phase splitting module F1 and the starting end S of the motor respectively.
The first input end of the second switch module K2 is connected with a second direct-current voltage source VCC2, the second input end of the second switch module K2 is connected with a second live wire L2, the control end of the second switch module K2 is connected with the control module C1, and the output end of the second switch module K2 is connected with the second end of the phase splitting module F1 and the operation end M of the motor respectively.
The first switch module K1 is configured to provide operating voltage to the phase separation module F1 and the start-up terminal S of the motor upon motor start-up, and to stop providing operating voltage to the phase separation module F1 and the start-up terminal S of the motor after the motor has successfully started.
The second switch module K2 is configured to provide operating voltage to the phase separation module F1 and the operating terminals M of the motor when the motor is started, and to continue to provide operating voltage to the phase separation module F1 and the operating terminals M of the motor after the motor is successfully started until the motor stops operating.
The phase separation module F1 is configured to provide voltages at the start terminal S and the run terminal M of the motor with a phase difference of 90 ° to enable the motor to start.
And a common end C of the motor is connected with a zero line N.
It should be noted that, the control module C1 in the embodiment of the present invention is an independent setting, and can also be integrated on a control panel, such as a control panel of an air conditioner, the control panel can control various operating parameters of the air conditioner, and the control panel can also control the start and stop of the motor.
In one example, the control board outputs a motor start signal to the first switch module K1, and in response to receiving the motor start signal, the first switch module K1 closes such that a line is completed between the first hot line L1, the phase separation module F1, and the start terminal S of the motor, thereby providing operating voltage to the phase separation module F1 and the start terminal S of the motor. The control board also outputs a start-up success signal to the first switch module K1, and in response to receiving the start-up success signal, the first switch module K1 is opened so that the lines between the first live line L1, the phase separation module F1 and the start-up terminal S of the motor are disconnected, thereby being able to stop supplying the operating voltage to the phase separation module F1 and the start-up terminal S of the motor.
In another example, the control board also outputs a motor run signal to the second switch module K2, and in response to receiving the motor run signal, the second switch module K2 closes such that the lines between the second hot line L2, the phase separation module F1, and the run terminal M of the motor are completed, thereby providing operating voltage to the phase separation module F1 and the run terminal M of the motor. The control board can also output a motor stop signal to the second switch module K2, and in response to receiving the motor stop signal, the second switch module K2 is opened so that the line between the second live line L2, the phase separation module F1 and the operating terminal M of the motor is disconnected, thereby being able to stop supplying the operating voltage to the phase separation module F1 and the operating terminal M of the motor.
In actual work, taking the starting time of the motor as 2S as an example, in the starting process of the motor, the control board outputs a motor starting signal with the duration of 2S to the starting end S of the motor, and after 2S, the control board outputs a starting success signal, that is, only outputs the working voltage with the duration of 2S to the starting end S of the motor. Meanwhile, the control board continuously outputs a motor running signal to the running end M of the motor, namely continuously outputs working voltage until the motor stops working.
According to the utility model discloses an embodiment, when the motor starts, control module C1 can provide operating voltage to phase splitting module F1 and the start-up end S of motor through first switch module K1, provides operating voltage to phase splitting module F1 and the operation end M of motor through second switch module K2, that is to say, the voltage to the start-up end S of motor and operation end M provides and has 90 phase difference to make the motor can start. After the motor is successfully started, the control module C1 may stop providing the operating voltage to the phase-splitting module F1 and the start terminal S of the motor through the first switch module K1, at which time the start terminal S of the generator (i.e., the start winding) no longer participates in the starting operation of the engine. The control module C1 then continues to provide operating voltage to the phase separation module F1 and the run terminal M of the motor through the second switch module K2 until the motor ceases to operate.
As described above, the embodiment of the present invention controls the connection and disconnection of the start terminal S of the motor through the control module C1, and since the control module C1 can execute the above functions through the preset time sequence program, the start of the generator can no longer participate in the starting operation of the engine without maintaining the heating resistance of the PTC starter itself through the weak current, so as to reduce the energy consumption of the single-phase motor.
Fig. 2 is a schematic structural diagram of a start control system of a motor according to another embodiment of the present invention. As shown in FIG. 2, the first switch module K1, the second switch module K2, the phase splitting module F1, and the control module C1 may each be comprised of components. The specific structure of the first switch module K1, the second switch module K2, the split-phase module F1, and the control module C1 will be illustrated.
In an example, the first switch module K1 includes a first transistor M1, a first diode D1, a first coil assembly Z1, and a first contact assembly.
A control terminal of the first transistor M1 is connected to the first output terminal of the control module C1, a first terminal of the first transistor M1 is connected to the input terminal of the first diode D1, and a second terminal of the first transistor M1 is grounded; the output end of the first diode D1 is connected with a first direct-current voltage source VCC 1; the first coil assembly Z1 is connected in parallel with a first diode D1; the static contact of the first contact assembly is connected with a first live wire L1, and the movable contact of the first contact assembly is respectively connected with the first end of the phase separation module F1 and the starting end S of the motor.
The first transistor M1 is configured to close the movable contact of the first contact assembly upon motor start-up and to open the movable contact of the first contact assembly upon successful motor start-up. The operation of the first switch module K1 will be described in detail with reference to fig. 2.
In one example, the control module C1 outputs a motor start signal, and in response to receiving the motor start signal, the first transistor M1 is turned on, a current passes through the first coil assembly Z1, a first electromagnetic field is generated, a fixed contact and a movable contact in the first contact assembly are turned on by the first electromagnetic field, and the movable contact of the first contact assembly is connected with the first end of the phase-separated module F1 and the start end S of the motor respectively because the fixed contact in the first contact assembly is connected with the first live line L1, so that the first live line L1 can provide an operating voltage to the phase-separated module F1 and the start end S of the motor.
In another example, after the motor is successfully started, the control module C1 outputs a start-up success signal, and in response to receiving the start-up success signal, the first transistor M1 is turned off, the first coil assembly Z1 is de-energized, the first electromagnetic field disappears, and the fixed and movable contacts in the first contact assembly are opened, so that the supply of the operating voltage to the phase-splitting module F1 and the start-up terminal S of the motor is stopped in the first live line L1.
In an embodiment of the present invention, the first end of the second switch module K2 includes a second transistor M2, a second diode D2, a second coil assembly Z2 and a second contact assembly.
A control end of the second transistor M2 is connected to the second output end of the control module C1, a first end of the second transistor M2 is connected to the input end of the second diode D2, and a second end of the second transistor M2 is grounded; the output end of the second diode D2 is connected with a second direct-current voltage source VCC 2; the second coil assembly Z2 is connected in parallel with a second diode D2; the static contact of the second contact assembly is connected with a second live wire L2, and the moving contact of the second contact assembly is respectively connected with the second end of the phase separation module F1 and the running end M of the motor.
The second transistor M2 is configured to close the movable contact of the second contact assembly upon start-up of the motor and to maintain the movable contact of the second contact assembly closed after successful start-up of the motor until the motor ceases operation. The operation of the second switch module K2 will be described in detail with reference to fig. 2.
In one example, the control module C1 outputs a motor operation signal, and in response to receiving the motor operation signal, the second transistor M2 is turned on, and current passes through the second coil assembly Z2 to generate a second electromagnetic field, under the action of which the fixed contact and the movable contact of the second contact assembly are connected, and since the fixed contact of the second contact assembly is connected with the second live wire L2, the movable contact of the second contact assembly is connected with the second end of the phase-splitting module F1 and the operation end M of the motor, respectively, so that the second live wire L2 can provide the operation voltage to the phase-splitting module F1 and the operation end M of the motor.
In another example, after the motor is stopped, the control module C1 outputs a motor stop signal, and in response to receiving the motor stop signal, the second transistor M2 is turned off, the second coil assembly Z2 is powered off, the second electromagnetic field disappears, the fixed and movable contacts in the second contact assembly are opened, so that the supply of the operating voltage to the phase separation module F1 and the operating terminal M of the motor is stopped in the second live line L2, and the motor stops operating.
The utility model discloses an in the embodiment, phase separation module F1 includes electric capacity, and the first end of electric capacity is connected with the output of first switch module K1 and the start-up end S of motor respectively, and the second end of electric capacity is connected with the output of second switch module K2 and the operation end M of motor respectively. The voltage between the starting end S and the running end M of the motor can have a phase difference of 90 degrees through the capacitor, so that magnetic field moments with the phase difference of 90 degrees are generated, and the rotor arranged in the running winding of the running end M of the motor generates initial rotation torque.
In order to enable the start control system of the motor in the embodiment of the present invention to operate stably, referring to fig. 2, the start control system further includes a first current limiting resistor, a first end of the first current limiting resistor R1 is connected to the first output end of the control module C1, and a second end of the first current limiting resistor R1 is connected to the control end of the first transistor M1.
Similarly, the start-up control system further includes a second current limiting resistor, a first terminal of the second current limiting resistor R2 is connected to the second output terminal of the control module C1, and a second terminal of the second current limiting resistor R2 is connected to the control terminal of the second transistor M2.
In the embodiment of the utility model, refer to fig. 2, start control system still includes motor protector B1, and motor protector B1's first end is connected with the common port C of motor, and motor protector B1's second termination zero line N. The motor protector B1 is used for alarming or protecting the motor when overload, phase loss, locked rotor, short circuit, overvoltage, undervoltage, leakage, three-phase unbalance, overheat, bearing abrasion and stator-rotor eccentricity occur. The motor protector B1 that is widely used at present includes: the bimetal type and the thermistor type are different in structure and function, and a person skilled in the art can select an appropriate motor protector B1 according to actual needs, which is not limited herein.
According to the embodiment of the present invention, the first switch module K1, the second switch module K2 and the control module C1 are integrated on a circuit board, such as a control board.
In one example, the function of the control module C1 may be implemented by a control chip on a control board, and the first switching device may be integrated on the control board in the form of an electromagnetic relay together with the control chip. The input ends of the first switching device and the first switching device are respectively connected with corresponding pins of the control chip. The functions of the pins can be multiplexed, that is, the first switching device and the input terminal of the first switching device can also be connected with the same pin of the control chip.
According to the utility model discloses an embodiment, first switch module K1 and second switch module K2's realization form also can realize through other electronic components that have switch function, for example photoelectric isolation switch etc. and the technical personnel in the art can choose for use according to actual need, and the restriction is not carried out here.
According to the utility model discloses an embodiment, first live wire L1, second live wire L2 and zero line N can all draw from control module C1 to simplify the start control system's of motor structure. In one example, the air conditioner may introduce the live wire and the neutral wire N into a control board of the air conditioner through a triangular plug, and then the control board outputs the operating voltage to the start terminal S and the operation terminal M of the motor.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For the device embodiments, reference may be made to the description of the method embodiments in the relevant part. Embodiments of the invention are not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art may make various changes, modifications, and additions or change the order between the steps after appreciating the spirit of the embodiments of the invention. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of embodiments of the invention are programs or code segments that are used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
Claims (9)
1. A starting control system of a motor is characterized by comprising a first switch module, a second switch module, a phase splitting module and a control module; wherein,
the first input end of the first switch module is connected with a first direct-current voltage source, the second input end of the first switch module is connected with a first live wire, the control end of the first switch module is connected with the control module, and the output end of the first switch module is respectively connected with the first end of the phase splitting module and the starting end of the motor;
a first input end of the second switch module is connected with a second direct-current voltage source, a second input end of the second switch module is connected with a second live wire, a control end of the second switch module is connected with the control module, and an output end of the second switch module is respectively connected with a second end of the phase splitting module and an operation end of the motor;
the first switch module is configured to provide working voltage to the phase separation module and the starting end of the motor when the motor is started, and stop providing working voltage to the phase separation module and the starting end of the motor after the motor is started successfully;
the second switch module is configured to provide working voltage for the phase separation module and the operation end of the motor when the motor is started, and to continuously provide working voltage for the phase separation module and the operation end of the motor after the motor is successfully started until the motor stops working;
the phase separation module is configured to provide a phase difference of 90 DEG to the voltages of the starting end and the running end of the motor so as to start the motor;
and the common end of the motor is connected with a zero line.
2. The start control system of the motor of claim 1, wherein the first switch module comprises a first transistor, a first diode, a first coil component, and a first contact component;
the control end of the first transistor is connected with the first output end of the control module, the first end of the first transistor is connected with the input end of the first diode, and the second end of the first transistor is grounded;
the output end of the first diode is connected with the first direct-current voltage source;
the first coil assembly is connected with the first diode in parallel;
the static contact of the first contact assembly is connected with the first live wire, and the movable contact of the first contact assembly is respectively connected with the first end of the phase separation module and the starting end of the motor;
the first transistor is configured to close the movable contact of the first contact assembly upon startup of the motor and to open the movable contact of the first contact assembly upon successful startup of the motor.
3. The start control system of the electric machine according to claim 1, wherein the first end of the second switch module includes a second transistor, a second diode, a second coil component, and a second contact component;
the control end of the second transistor is connected with the second output end of the control module, the first end of the second transistor is connected with the input end of the second diode, and the second end of the second transistor is grounded;
the output end of the second diode is connected with the second direct current voltage source;
the second coil assembly is connected in parallel with the second diode;
the static contact of the second contact assembly is connected with the second live wire, and the movable contact of the second contact assembly is respectively connected with the second end of the phase separation module and the running end of the motor;
the second transistor is configured to close the movable contact of the second contact assembly upon start-up of the motor and to maintain the movable contact of the second contact assembly closed after successful start-up of the motor until the motor ceases operation.
4. The system of claim 1, wherein the phase separation module comprises a capacitor, a first terminal of the capacitor is connected to the output terminal of the first switch module and the start terminal of the motor, and a second terminal of the capacitor is connected to the output terminal of the second switch module and the operation terminal of the motor.
5. The start-up control system of an electric motor of claim 2, further comprising a first current-limiting resistor, a first end of the first current-limiting resistor being connected to the first output terminal of the control module, and a second end of the first current-limiting resistor being connected to the control terminal of the first transistor.
6. The start-up control system of an electric motor of claim 3, further comprising a second current limiting resistor, a first end of the second current limiting resistor being connected to the second output terminal of the control module, a second end of the second current limiting resistor being connected to the control terminal of the second transistor.
7. The start control system of an electric motor of claim 1 further comprising a motor protector, a first end of said motor protector being connected to a common end of said electric motor, a second end of said motor protector being connected to a neutral line.
8. The start control system of an electric motor of claim 1, wherein said first switch module, said second switch module and said control module are integrated on a circuit board.
9. The start control system of an electric motor of claim 1, wherein said first hot line, said second hot line and said neutral line are all routed from said control module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721239390.3U CN207625471U (en) | 2017-09-25 | 2017-09-25 | The startup control system of motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201721239390.3U CN207625471U (en) | 2017-09-25 | 2017-09-25 | The startup control system of motor |
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| CN207625471U true CN207625471U (en) | 2018-07-17 |
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