CN208112511U - A kind of Special frequency converter for ball grinding mill - Google Patents
A kind of Special frequency converter for ball grinding mill Download PDFInfo
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- CN208112511U CN208112511U CN201820414129.0U CN201820414129U CN208112511U CN 208112511 U CN208112511 U CN 208112511U CN 201820414129 U CN201820414129 U CN 201820414129U CN 208112511 U CN208112511 U CN 208112511U
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Abstract
The utility model discloses a kind of Special frequency converter for ball grinding mill, including major loop, control loop and measure loop；Major loop includes the frequency conversion major loop and power frequency major loop being connected in parallel.Frequency conversion major loop includes first fuse group, the first relay normally open switch, three-phase semi-controlled bridge type commutating circuit, filter circuit, brake circuit and inversion circuit, in parallel with three-phase semi-controlled bridge type commutating circuit powers on soft charge circuit, first fuse group is electrically connected with power supply, and the output end of inversion circuit is electrically connected with ball grinder motor；Power frequency major loop includes second fuse group and thermal protector; full voltage starting circuit and reduced-voltage starting circuit parallel with one another are serially connected between second fuse group and thermal protector; second fuse group is electrically connected with power supply, and thermal protector is electrically connected with ball grinder motor.The utility model is a kind of frequency control and the simultaneous frequency converter deposited of industrial frequency control, and work efficiency is high, and entire control process fast response time, more securely and reliably.
Description
Technical field
The utility model relates to converter technology field more particularly to a kind of Special frequency converter for ball grinding mill.
Background technique
Ball mill uses simple industrial frequency control, easily causes the overmastication of material, and required milling cycle is longer, grinding effect
Rate is lower, and unit product power consumption is larger, and starting current is big, very big to the impact of equipment and power grid, the production maintenance of mechanical equipment
Measure also big, and the waste of electricity is quite surprising, this will necessarily bring many unnecessary troubles and serious to manufacturer
The wasting of resources, so with the development of social economy and the expansion of production scale of enterprise, the disadvantage of direct industrial frequency control ball mill
It has been be completely exposed that, and it is fast-developing seriously to hinder each industrial enterprise.This just promotes people to go, and development starting is smooth, grinds effect
Rate develops the Special frequency converter for realizing frequency control ball mill compared with ball mill high, that yield is big, low energy consumption.
Currently, Special frequency converter for ball grinding mill can only realize simple frequency control, although frequency control can be ball milling
The motor of machine provides voltage regulation and frequency modulation power supply, has and starts smooth, grinding efficiency height, low power consumption and other advantages, once but frequency control
Circuit is broken down or Maintenance and Repair will take a long time, and ball mill reduces cisco unity malfunction instead during this period
Working efficiency, affects productivity effect.Meanwhile the control loop of most of Special frequency converter for ball grinding mill is simple relay
Device control loop, response speed is slower, causes the security reliability of the entire control process of frequency converter poor.
Utility model content
In order to overcome above-mentioned the deficiencies in the prior art, the technical issues of the utility model solves, is to provide one kind
Frequency control and the simultaneous Special frequency converter for ball grinding mill deposited of industrial frequency control, improve work efficiency and also entire control process more
Securely and reliably.
In order to solve the above technical problems, technical solution used by the utility model is：A kind of ball mill tailored version frequency conversion
Device, the frequency converter include major loop, the control loop of logic control are carried out to the major loop and is carried out to the major loop
The measure loop of real-time monitoring；The major loop includes frequency conversion major loop and power frequency major loop, the frequency conversion major loop and described
Power frequency major loop is in parallel；
The frequency conversion major loop includes first fuse group, the first relay normally open switchs, three-phase semi-controlled bridge type rectifies back
Road, filter circuit, brake circuit and inversion circuit, the power on soft charge in parallel with the three-phase semi-controlled bridge type commutating circuit are returned
Road, the first fuse group are electrically connected with power supply, and the output end of the inversion circuit is electrically connected with ball grinder motor；
The power frequency major loop includes second fuse group and thermal protector, the second fuse group and the Thermal protection
Full voltage starting circuit and reduced-voltage starting circuit are serially connected between device, the reduced-voltage starting circuit and the full voltage starting circuit are simultaneously
Connection, the second fuse group are electrically connected with the power supply, and the thermal protector is electrically connected with the ball grinder motor.
Further, the full voltage starting circuit include the second relay normally open switch, the reduced-voltage starting circuit include according to
Third relay normally open switch, auto-transformer and the 4th relay normally open switch of secondary concatenation.
Further, the filter circuit, the brake circuit and the inversion circuit are whole with the three-phase semi-controlled bridge type
Road parallel connection is flowed back to, the three-phase semi-controlled bridge type commutating circuit is made of three groups of concatenated silicon-controlled and diodes in parallel, the filter
Wave circuit is in series by two capacitors, described to power on soft charge circuit by charging diode, charging resistor and described filter back
Road is in series, and the brake circuit is in series by braking resistor and insulated gate bipolar transistor, and the inversion circuit is by three
The concatenated insulated gate bipolar transistor parallel connection of group two is constituted.
Further, two capacitors are in parallel with equalizing resistance.
Further, the control loop includes microprocessing unit, the variable frequency starting control being electrically connected with the microprocessing unit
Circuit processed, full voltage starting control loop, reduced-voltage starting control loop, rectification control loop, brake servo circuit, inversion control are returned
Road；
The variable frequency starting control loop is used to control the state of the first relay normally open switch, the full voltage starting
Control loop is used to control the state of the second relay normally open switch, and the reduced-voltage starting control loop controls the third
The state of relay normally open switch and the 4th relay normally open switch, the rectification control loop are described controllable for controlling
The state of silicon, the brake servo circuit are used to control the state of insulated gate bipolar transistor described in the brake circuit, institute
Inversion control circuit is stated for controlling the state of insulated gate bipolar transistor described in the inversion circuit.
Further, the measure loop includes the current detection circuit being electrically connected with the microprocessing unit, voltage detecting
Circuit, temperature detection circuit and velocity measuring circuit；The current detection circuit includes current transformer, the current transformer
It is serially connected in the output end of the major loop；The voltage detection circuit includes voltage transformer, the voltage transformer with it is described
Filter circuit is in parallel；The temperature detection circuit includes the temperature sensor being mounted in the frequency converter shell；The speed
Measure loop includes the velocity sensor being mounted on the ball grinder motor.
Further, the frequency converter further include the first indicator light being electrically connected with the microprocessing unit, the second indicator light,
Display screen, control button and radiator.
Further, multiple ventilation holes are offered on the partition.
By using above-mentioned technical proposal, the beneficial effect that the utility model obtains is：
Special frequency converter for ball grinding mill is a kind of frequency control and the simultaneous frequency converter deposited of industrial frequency control, any of which control
System breaks down, and does not affect the implementation of another control, ensure that the operation of ball mill, improve work efficiency；The frequency conversion
Device further comprises the measure loop for carrying out the control loop of logic control to major loop and carrying out real-time monitoring to major loop；Control
Circuit is by microprocessing unit and variable frequency starting control loop, full voltage starting control loop, reduced-voltage starting control loop, rectification control
The control to electronic component working condition in major loop, Jin Ershi are realized in circuit processed, brake servo circuit, inversion control circuit
Existing frequency conversion and the conversion of power frequency operating condition and the control of commutating circuit, brake circuit and inversion circuit under frequency conversion operating condition, to be
Ball mill under different operating condition operations provides voltage regulation and frequency modulation power supply appropriate, energy saving and raising grinding efficiency.Entire control
Process fast response time, and it is more safe and reliable.
Detailed description of the invention
Fig. 1 is the main loop circuit schematic diagram of the utility model Special frequency converter for ball grinding mill；
Fig. 2 is the control loop circuit diagram of the utility model Special frequency converter for ball grinding mill；
Fig. 3 is the measure loop circuit diagram of the utility model Special frequency converter for ball grinding mill；
In figure：1- frequency conversion major loop, 11- three-phase semi-controlled bridge type commutating circuit, 12- filter circuit, 13- brake circuit, 14-
Inversion circuit, 15- power on soft charge circuit, 2- power frequency major loop, 21- full voltage starting circuit, 22- reduced-voltage starting circuit, 31-
Variable frequency starting control loop, 32- full voltage starting control loop, 33- reduced-voltage starting control loop, 34- rectify control loop, 35-
Brake servo circuit, 36- inversion control circuit, 41- current detection circuit, 42- voltage detection circuit, 43- temperature detection circuit,
44- velocity measuring circuit, the first relay normally open of KM1- switch, the second relay normally open of KM2- switch, KM3- third relay
Normal open switch, the 4th relay normally open of KM4- switch, FU1- first fuse group, FU2- second fuse group, FR- Thermal protection
Device, VT1, VT3, VT5- are silicon-controlled, VD1- charging diode, VD2, VD3, VD4, VD6- diode, and T1~T7- insulated gate is double
Gated transistors, R1- charging resistor, R2, R3- equalizing resistance, R4- braking resistor, C1, C2- capacitor, QZB- auto-transformer,
TA- current transformer, M- ball grinder motor, U, V, W- three-phase power line, a, b, c- variable-frequency power sources access point, d, e, f- frequency conversion
Power supply output point.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.
As shown in Figure 1, frequency converter includes major loop, which includes frequency conversion major loop 1 and power frequency major loop 2, frequency conversion
Major loop 1 and power frequency major loop 2 are in parallel；Make ball grinder motor M can the operation of frequency conversion operating condition but also the operation of power frequency operating condition.
Frequency conversion major loop 1 include first fuse group FU1 (have fuse three, respectively with three-phase power line U, V, W phase
Connection), the first relay normally open switch KM1, three-phase semi-controlled bridge type commutating circuit 11, filter circuit 12, brake circuit 13 and inverse
Become road 14 again, filter circuit 12, brake circuit 13 and inversion circuit 14 are in parallel with three-phase semi-controlled bridge type commutating circuit 11；On
Electric soft charge circuit 15 is in parallel with three-phase semi-controlled bridge type commutating circuit 11, the limitation for powered on moment to dash current.First
Fuse group FU1 is electrically connected with power supply.First relay normally open one end switch KM1 and first fuse group FU1, first after
The input terminal (i.e. variable-frequency power sources access point a, b, c) of the electric appliance normal open switch KM1 other end and three-phase semi-controlled bridge type commutating circuit 11
It is connected, the output end (i.e. variable-frequency power sources output point d, e, f) of inversion circuit 14 is electrically connected with ball grinder motor M；
Wherein, three-phase semi-controlled bridge type commutating circuit 11 by three groups of concatenated silicon-controlled VT1, VT3, VT5 and diode VD2,
VD4, VD6 parallel connection are constituted, specially：The cathode of three silicon-controlled VT1, VT3, VT5, which link together, forms silicon-controlled common cathode
Group, the anode of three diodes VD2, VD4, VD6, which link together, forms diode common-anode group, the anode of silicon-controlled VT1 and
The cathode correspondence of diode VD2 is connected, and the node of silicon-controlled VT1 and diode VD2 are variable-frequency power sources access point a；It is silicon-controlled
The anode of VT3 is connected with the cathode of diode VD4 correspondence, and the node of silicon-controlled VT3 and diode VD4 connect for variable-frequency power sources
Access point b；Silicon-controlled VT5 is connected with the cathode of diode VD6 correspondence, and the node of silicon-controlled VT5 and diode VD6 are variable-frequency electric
Source access point c.Variable-frequency power sources access point a, b, c are correspondingly connected with three-phase power line W, V, U respectively.
The both ends of filter circuit 12 sun with the cathode of silicon-controlled VT1, VT3, VT5, diode VD2, VD4, VD6 respectively
Pole is connected, and the filter circuit 12 is in series by two capacitors C1, C2, and capacitor C1 is in parallel with equalizing resistance R2, capacitor C2 electricity
Hold in parallel with equalizing resistance R3.
It is in series by charging diode VD1, charging resistor R1 and above-mentioned filter circuit 12 to power on soft charge circuit 15,
That is, damage of the heavy current to major loop, is pre-charged in order to prevent, at this time in filter circuit 12 when just powering on
Two capacitors C1, C2 and charging diode VD1 and charging resistor R1 are in series powers on soft charge circuit 15, charging diode
The anode of VD1 is connected with three-phase power line W, and the cathode of charging diode VD1 is connected with charging resistor R1.
Brake circuit 13 is connected in parallel on the both ends of filter circuit 12, and brake circuit 13 is brilliant by braking resistor R4 and insulated gate bipolar
Body pipe T7 is in series, and insulated gate bipolar transistor T7 is in parallel with diode VD3.
Inversion circuit 14 is made of three groups two concatenated insulated gate bipolar transistor T1~T6 parallel connections, specially：Wherein
The collector of three insulated gate bipolar transistors T1, T3, T5, which link together, forms common collector group, and excess-three insulated gate is double
The emitter of gated transistors T2, T4, T6, which link together, forms common emitter group；Filter circuit 12 (or brake circuit 13)
Both ends are double with insulated gate in the collector of insulated gate bipolar transistor T1, T3, T5 in common collector group and common emitter group respectively
The emitter of gated transistors T2, T4, T6 are connected.Insulated gate bipolar transistor T1, T3, T5 emitter in common collector group with
The collector correspondence of insulated gate bipolar transistor T2, T4, T6 in common emitter group are connected.I.e.：Insulated gate bipolar transistor
The emitter of T1 is connected with the collector of insulated gate bipolar transistor T2 correspondence, insulated gate bipolar transistor T1 and insulated gate
The node of bipolar transistor T2 is variable-frequency power sources output point d；The emitter of insulated gate bipolar transistor T3 and；Insulated gate bipolar is brilliant
The collector correspondence of body pipe T4 is connected, and the node of insulated gate bipolar transistor T3 and insulated gate bipolar transistor T4 are variable-frequency electric
Source output point e；The emitter of insulated gate bipolar transistor T5 is connected with the collector of insulated gate bipolar transistor T6 correspondence, absolutely
The node of edge grid bipolar transistor T5 and insulated gate bipolar transistor T6 are variable-frequency power sources output point f.
Power frequency major loop 2 includes the second fuse group FU2 and thermal protector FR of concatenation, second fuse group FU2 and heat
Full voltage starting circuit 21 and reduced-voltage starting circuit 22, reduced-voltage starting circuit 22 and full voltage starting circuit are serially connected between protector FR
21 is in parallel, and second fuse group FU2 is electrically connected with power supply, and thermal protector FR is electrically connected with ball grinder motor M.Wherein, entirely
Pressing starting-up later time 21 includes the second relay normally open switch KM2, and reduced-voltage starting circuit 22 includes the third relay being sequentially connected in series
Normal open switch KM3, auto-transformer QZB and the 4th relay normally open switch KM4.
As shown in Fig. 2, control loop includes microprocessing unit, the variable frequency starting control loop being electrically connected with microprocessing unit
31, full voltage starting control loop 32, reduced-voltage starting control loop 33, rectification control loop 34, brake servo circuit 35, inversion control
Circuit 36 processed；Variable frequency starting control loop 31 is used to control the state of the first relay normally open switch KM1, and full voltage starting controls back
Road 32 is used to control the state of the second relay normally open switch KM2, and reduced-voltage starting control loop 33 controls third relay normally open
The state of switch KM3 and the 4th relay normally open switch KM4, rectification control loop 35 is for controlling silicon-controlled VT1, VT3, VT5
Cut-off or conducting, brake servo circuit 35 (opened as on-off for controlling insulated gate bipolar transistor T7 in brake circuit 13
Close and use) turn-on and turn-off, inversion control circuit 36 is for controlling insulated gate bipolar transistor T1~T6 in inversion circuit 14
Turn-on and turn-off, to realize the voltage of 14 output end of inversion circuit and the adjustment of frequency.
As shown in Figure 3, measure loop includes the current detection circuit 41 being electrically connected with microprocessing unit, voltage detection circuit
42, temperature detection circuit 43 and velocity measuring circuit 44；Current detection circuit 41 includes current transformer TA, and current transformer TA is
It two, is serially connected in the conducting wire that variable-frequency power sources output point d, f is electrically connected with frequency converter motor M, can be returned with real-time detection master respectively
The electric current of road output.Voltage detection circuit 42 includes voltage transformer (not shown), voltage transformer and filter circuit 12
Parallel connection, for the voltage between real-time detection DC bus；Temperature detection circuit 43 includes the temperature being mounted in frequency converter shell
Sensor, for detecting heat caused by insulated gate bipolar transistor T1~T6 in inversion circuit 14；Velocity measuring circuit 44
The speed of service including the velocity sensor being mounted on ball grinder motor M, for real-time detection ball grinder motor M.
Frequency converter further includes the first indicator light, the second indicator light, display screen, control button being electrically connected with microprocessing unit
And radiator, the first indicator light is for showing that frequency converter is currently in frequency conversion operating condition, the second indicator light for showing frequency converter mesh
Preceding to be in power frequency frequency operating condition, display screen is used for the data and current frequency converter that sensor, mutual inductor detect in measure loop
Operation conditions, temperature is excessively high, and when being more than preset value, microprocessing unit controls radiator work, radiates, and can pass through behaviour
Make button to microprocessing unit send instructions signal, controls the operation of frequency converter.
Concrete operating principle：
Frequency conversion operating condition：Microprocessing unit control receives the operation order of frequency conversion operating condition, the control of variable frequency starting control loop 31 the
One relay normally open switch KM1 closure, the second relay normally open switch KM2 at this time, third relay normally open switch KM3, the 4th
Relay normally open switch KM4 is in an off state.When just powering on, rectification control loop 34 is controlled at silicon-controlled VT1, VT3, VT5
In off state, soft charge circuit 15 is powered at this time, two capacitors C1, C2 are pre-charged, when voltage detection circuit 42 detects
Voltage value be load voltage value when, rectification control loop 34 start generate commutating pulse, trigger silicon-controlled VT1, VT3, VT5 and lead
Logical, charging resistor R1 and two pole VD1 of charging are shorted by silicon-controlled VT1, VT3, VT5 at this time, exit pre-charge state, and two at this time
Capacitor C1, C2 start to take on filter action.
According to the data that velocity measuring circuit 44 is detected, microprocessing unit uses space vector Sine Wave Pulse Width Modulation
(PWM) mode controls the turn-on and turn-off of insulated gate bipolar transistor T1~T6 in inversion circuit 14 to adjust inversion circuit 14
The voltage and frequency of output end voltage and frequency, i.e. major loop output, its institute is provided based on the actual needs of frequency converter motor M
The supply voltage needed, and then achieve the purpose that energy conservation and speed regulation.When frequency converter motor M is in deceleration regime, microprocessing unit
Insulated gate bipolar transistor T7 conducting in brake circuit 13 is controlled, generated regeneration is electric in moderating process by variable-frequency motor M
It can be consumed in braking resistor on R4 in the form of thermal energy, and then reach a necessary, good braking effect.Specific inverter
And braking principle, like the prior art, this will not be repeated here.
Power frequency operating condition：Microprocessing unit control receives the operation order of power frequency operating condition, the control of reduced-voltage starting control loop 33 the
Three relay normally open switch KM3 and the 4th relay normally open switch KM4 closure, at this time the first relay normally open switch KM1 and the
Two relay normally open switch KM2 are in an off state, and carry out reduced-voltage starting ball grinder motor M；(in Wei Chu after operation a period of time
Manage and preset a runing time in unit), full voltage starting control loop 32 controls the second relay normally open switch KM2 and closes and this
When the first relay normally open switch KM1, third relay normally open switch KM3 and the 4th relay normally open switch KM4 be in disconnect
State carries out total pressure pressure starting ball grinder motor M；Frequency converter frequency conversion condition module is overcome in the situation of maintenance that needs repairing
Under, the difficulty that ball mill can not work normally improves work efficiency.
The specific embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the utility model is not
Be limited to above embodiment, technical field those of ordinary skill within the scope of knowledge, can also not depart from
Various changes can be made under the premise of the utility model aims.
Claims (7)
1. a kind of Special frequency converter for ball grinding mill, which is characterized in that the frequency converter includes major loop, carries out to the major loop
The control loop of logic control and the measure loop that real-time monitoring is carried out to the major loop；
The major loop includes frequency conversion major loop and power frequency major loop, and the frequency conversion major loop and the power frequency major loop are in parallel；
The frequency conversion major loop includes first fuse group, the first relay normally open switch, three-phase semi-controlled bridge type commutating circuit, filter
Wave circuit, brake circuit and inversion circuit, it is in parallel with the three-phase semi-controlled bridge type commutating circuit to power on soft charge circuit, it is described
First fuse group is electrically connected with power supply, and the output end of the inversion circuit is electrically connected with ball grinder motor；
The power frequency major loop includes second fuse group and thermal protector, the second fuse group and the thermal protector it
Between be serially connected with full voltage starting circuit and reduced-voltage starting circuit, the reduced-voltage starting circuit is in parallel with the full voltage starting circuit, institute
It states second fuse group to be electrically connected with the power supply, the thermal protector is electrically connected with the ball grinder motor.
2. Special frequency converter for ball grinding mill as described in claim 1, which is characterized in that the full voltage starting circuit includes second
Relay normally open switch, the reduced-voltage starting circuit include be sequentially connected in series third relay normally open switch, auto-transformer and
4th relay normally open switch.
3. Special frequency converter for ball grinding mill as claimed in claim 2, which is characterized in that the filter circuit described is braked back
Road and the inversion circuit are in parallel with the three-phase semi-controlled bridge type commutating circuit, and the three-phase semi-controlled bridge type commutating circuit is by three
Group is concatenated silicon-controlled and diodes in parallel is constituted, and the filter circuit is in series by two capacitors, described to power on soft charge
Circuit is in series by charging diode, charging resistor and the filter circuit, and the brake circuit is by braking resistor and insulation
Grid bipolar transistor is in series, and the inversion circuit is by the three groups two concatenated insulated gate bipolar transistor parallel connection structures
At.
4. Special frequency converter for ball grinding mill as claimed in claim 3, which is characterized in that two capacitors are and equalizing resistance
It is in parallel.
5. Special frequency converter for ball grinding mill as claimed in claim 3, which is characterized in that the control loop includes micro process list
Member, the variable frequency starting control loop being electrically connected with the microprocessing unit, full voltage starting control loop, reduced-voltage starting control back
Road, rectification control loop, brake servo circuit, inversion control circuit；
The variable frequency starting control loop is used to control the state of the first relay normally open switch, the full voltage starting control
Circuit is used to control the state of the second relay normally open switch, and the reduced-voltage starting control loop controls the third relay
The state of device normal open switch and the 4th relay normally open switch, the rectification control loop are described silicon-controlled for controlling
State, the brake servo circuit is used to control the state of insulated gate bipolar transistor described in the brake circuit, described inverse
Become the state that control loop is used to control insulated gate bipolar transistor described in the inversion circuit.
6. Special frequency converter for ball grinding mill as claimed in claim 5, which is characterized in that the measure loop include with it is described micro-
Current detection circuit, voltage detection circuit, temperature detection circuit and the velocity measuring circuit of processing unit electrical connection；The electric current
Measure loop includes current transformer, and the current transformer is serially connected in the output end of the major loop；The voltage detecting is returned
Road includes voltage transformer, and the voltage transformer is in parallel with the filter circuit；The temperature detection circuit includes being mounted on
Temperature sensor in the frequency converter shell；The velocity measuring circuit includes the speed being mounted on the ball grinder motor
Sensor.
7. such as Special frequency converter for ball grinding mill described in claim 5 or 6, which is characterized in that the frequency converter further includes and institute
State the first indicator light, the second indicator light, display screen, control button and the radiator of microprocessing unit electrical connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820414129.0U CN208112511U (en) | 2018-03-26 | 2018-03-26 | A kind of Special frequency converter for ball grinding mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820414129.0U CN208112511U (en) | 2018-03-26 | 2018-03-26 | A kind of Special frequency converter for ball grinding mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208112511U true CN208112511U (en) | 2018-11-16 |
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ID=64122945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820414129.0U Active CN208112511U (en) | 2018-03-26 | 2018-03-26 | A kind of Special frequency converter for ball grinding mill |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445421A (en) * | 2019-08-09 | 2019-11-12 | 三一汽车制造有限公司 | The start-up circuit of motor and the control method of start-up circuit and engineering machinery |
-
2018
- 2018-03-26 CN CN201820414129.0U patent/CN208112511U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445421A (en) * | 2019-08-09 | 2019-11-12 | 三一汽车制造有限公司 | The start-up circuit of motor and the control method of start-up circuit and engineering machinery |
| CN110445421B (en) * | 2019-08-09 | 2021-11-16 | 三一汽车制造有限公司 | Starting circuit of motor, control method of starting circuit and engineering machinery |
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