CN109120205A - Drive control system and method for motor - Google Patents
Drive control system and method for motor Download PDFInfo
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- CN109120205A CN109120205A CN201811087513.5A CN201811087513A CN109120205A CN 109120205 A CN109120205 A CN 109120205A CN 201811087513 A CN201811087513 A CN 201811087513A CN 109120205 A CN109120205 A CN 109120205A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005070 sampling Methods 0.000 claims abstract description 105
- 238000004804 winding Methods 0.000 claims description 18
- 239000003990 capacitor Substances 0.000 claims description 11
- 230000009467 reduction Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 16
- 238000010586 diagram Methods 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 3
- 230000005347 demagnetization Effects 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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- Control Of Ac Motors In General (AREA)
Abstract
The application relates to a drive control system and method of a motor. The first sampling circuit is used for carrying out voltage sampling on direct current accessed to the inverter circuit to obtain a voltage sampling value and sending the voltage sampling value to the control circuit; the second sampling circuit is used for sampling the current flowing through the sampling resistor to obtain a current sampling value; the control circuit is used for calculating the current rotating speed of the motor according to the received current sampling value and the voltage sampling value; when the current rotating speed is higher than the preset rated rotating speed and the current rotating speed is lower than the preset target rotating speed, the over-modulation processing is carried out on the inverter circuit, so that the output voltage of the inverter circuit is increased. Under the condition that the rotating speed of the motor is larger than the preset rated rotating speed and the rotating speed needs to be continuously increased, the rotating speed of the motor can be continuously controlled, the control range of the rotating speed of the motor is enlarged, the control convenience is improved, and the problem of output voltage loss is avoided.
Description
Technical field
This application involves technical field of motors, more particularly to the driving control system and method for a kind of motor.
Background technique
With the continuous development of convertible frequency air-conditioner technology, requirement of the people to the comfort of convertible frequency air-conditioner and energy saving is increasingly
It is high, wherein refrigeration effect is an important factor for influencing air conditioning comfortableness.And compressor is a kind of low-pressure gas to be promoted to high pressure
The driven fluid machinery of gas is the heart of refrigeration system.Important component of the compressor as refrigeration and air conditioner industry,
In process of production, cost is also factor in need of consideration in production.Current compressor electric motor control system passes through three
The sampling resistor of resistance or two resistance as current sampling circuit, to reduce cost, current electric machine control system passes through
Multiple resistance need the progress when lower bridge arm is all opened as current sampling circuit, current sample, and voltage utilization is low, therefore electricity
The machine range of speeds is limited, there is a problem of that control convenience is low.
Traditional single resistance sampling circuit passes through a sampling resistor as current sampling resistor, while cost is reduced
Voltage utilization can be improved, further increase the control convenience to motor speed, but traditional single resistance sampling circuit due to
Current sample only is carried out using a sampling resistor, there are problems that output voltage loss
Summary of the invention
Based on this, it is necessary to aiming at the problem that output voltage loss of above-mentioned traditional single resistance sampling circuit, provide one
The driving control system and method for kind motor.
A kind of driving control system of motor, the system comprises the first sample circuit, sampling resistor, the second sampling electricity
Road, control circuit and inverter circuit, the first sample circuit are connect by sampling resistor with inverter circuit, inverter circuit connection electricity
Machine, the second sample circuit connect sampling resistor, and control circuit connects the first sample circuit, the second sample circuit and inverter circuit,
First sample circuit is used to obtain voltage sample value to the direct current progress voltage sample of access inverter circuit concurrent
It send to control circuit；Electric current of second sample circuit for the sampled resistance of convection current is sampled to obtain current sampling data and be sent
To control circuit；
The electric current that control circuit is used to receive the voltage sample value of the first sample circuit transmission and the second sample circuit is sent
Sampled value, and the current rotating speed of motor is calculated according to current sampling data and voltage sample value；It is greater than in current rotating speed default
Rated speed and current rotating speed be less than preset rotating speed of target when, to inverter circuit carry out ovennodulation processing, make inverter circuit
Output voltage increase.
In one embodiment, control circuit is also used to be greater than preset rated speed in current rotating speed and current rotating speed is small
When preset rotating speed of target, weak magnetic control is carried out to motor, to increase the revolving speed of motor.
In one embodiment, the first sample circuit includes first resistor and second resistance, first resistor and second resistance
One end connects inverter circuit after series connection, and the other end connects sampling resistor, and first resistor connects control with the common end of second resistance
Circuit.
In one embodiment, the second sample circuit include first resistor component, second resistance component, operational amplifier and
Feedback resistance, first resistor component connect the non-inverting input terminal of operational amplifier, and second resistance component connects operational amplifier
Inverting input terminal, first resistor component connect one end of sampling resistor, and second resistance component connects the other end of sampling resistor, fortune
The inverting input terminal for calculating amplifier connects the output end of operational amplifier, the output end connection of operational amplifier by feedback resistance
Control circuit.
In one embodiment, system further includes rectifier, and rectifier connects inverter circuit by sampling resistor, and first adopts
Sample circuit connection rectifier, rectifier access alternating current are rectified to obtain direct current and be exported from the outlet side of rectifier.
In one embodiment, system further includes filter capacitor, and filter capacitor is parallel to the outlet side of rectifier.
A kind of drive control method of motor, which comprises
Obtain the first sample circuit to the direct current of access inverter circuit carry out the obtained voltage sample value of voltage sample and
The current sampling data that the electric current of the second sampled resistance of sample circuit convection current is sampled；
The current rotating speed of motor is calculated according to voltage sample value and current sampling data；
When current rotating speed is greater than preset rated speed and current rotating speed is less than preset rotating speed of target, to inverter circuit
Ovennodulation processing is carried out, the output voltage of inverter circuit is increased.
In one embodiment, the current rotating speed of motor is calculated according to voltage sample value and current sampling data, comprising:
The machine winding current of motor is calculated according to current sampling data；
The current rotating speed of motor is calculated according to machine winding current and voltage sample value.
In one embodiment, it is greater than preset rated speed in current rotating speed and current rotating speed is less than preset target turn
When fast, ovennodulation processing is carried out to inverter circuit, after increasing the output voltage of inverter circuit, further includes:
When current rotating speed is greater than preset rated speed and current rotating speed is less than preset rotating speed of target, motor is carried out
Weak magnetic control, to increase the revolving speed of motor.
In one embodiment, it is greater than preset rated speed in current rotating speed and the current rotating speed is less than preset mesh
When marking revolving speed, to motor progress weak magnetic control, after the revolving speed to increase motor, further includes:
When the current rotating speed of motor is more than or equal to preset rotating speed of target and receives revolving speed reduction instruction, then exit weak
Magnetic control, and ovennodulation processing is carried out to inverter circuit, to reduce the revolving speed of motor.
The driving control system and method for above-mentioned motor, including the first sample circuit, sampling resistor.Second sample circuit,
Control circuit and inverter circuit, the first sample circuit are connect by sampling resistor with inverter circuit, and inverter circuit connects motor, the
Two sample circuits connect sampling resistor, and control circuit connects the first sample circuit, the second sample circuit and inverter circuit, and first adopts
Sample circuit is used to carry out the direct current of access inverter circuit voltage sample to obtain voltage sample value and be sent to control circuit；The
Electric current of two sample circuits for the sampled resistance of convection current is sampled to obtain current sampling data；Control circuit is for receiving first
The current sampling data that the voltage sample value and the second sample circuit that sample circuit is sent are sent, and according to current sampling data and voltage
The current rotating speed of motor is calculated in sampled value；It is greater than preset rated speed in current rotating speed and current rotating speed is less than preset
When rotating speed of target, ovennodulation processing is carried out to inverter circuit, increases the output voltage of inverter circuit.Pass through the first sample circuit
It is sampled respectively with the second sample circuit and obtains voltage sample value and current sampling data, control circuit is according to current sampling data and voltage
The current rotating speed of motor is calculated in sampled value, is greater than preset rated speed in current rotating speed and current rotating speed is less than preset
When rotating speed of target, ovennodulation processing is carried out to inverter circuit, increases the output voltage of inverter circuit, thus in the revolving speed of motor
In the case where also needing to continue to lift up revolving speed greater than preset rated speed, moreover it is possible to continue to control the revolving speed of motor, increase
Motor speed control range, and avoid the problem of output voltage loses.
Detailed description of the invention
Fig. 1 is the structural block diagram of the driving control system of motor in one embodiment；
Fig. 2 is the circuit structure diagram of the driving control system of motor in one embodiment；
Fig. 3 is the circuit structure diagram of the second sample circuit of the driving control system of motor in one embodiment；
Fig. 4 is the flow diagram of the drive control method of motor in one embodiment；
Fig. 5 is the flow diagram of the drive control method of motor in another embodiment；
Fig. 6 is the flow diagram of the drive control method of motor in another embodiment.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, not
For limiting the application.
In one embodiment, as shown in Figure 1, providing a kind of driving control system of motor, which be can be applied to
In compressor.The system comprises the first sample circuit 100, sampling resistor 200, the second sample circuits 300, control circuit
400 and inverter circuit 500.First sample circuit 100 is connect by sampling resistor 200 with inverter circuit 500, inverter circuit 500
Motor is connected, the second sample circuit 300 connects sampling resistor 200, and first sample circuit 100 of the connection of control circuit 400, second are adopted
Sample circuit 300 and inverter circuit 500.
Inverter circuit 500 accesses direct current by sampling resistor 200 and is handled to obtain exchange electricity output to motor.Specifically
Ground, inverter circuit 500 are intelligent power module, and the three road UVW voltages that inverter circuit 500 exports are exactly the input voltage of motor,
For controlling compressor rotary speed.
First sample circuit 100 is used to carry out the direct current of access inverter circuit 500 voltage sample to obtain voltage sample
It is worth and is sent to control circuit 400.Specifically, the directly sampled resistance 200 of the direct current of access is exported to inverter circuit 500,
Inverter circuit 500 is handled to obtain exchange electricity output to motor to the direct current of access again, therefore to access inverter circuit 500
Direct current carry out voltage sample and can characterize the current running voltage of motor, the first 100 pairs of sample circuit access inverter circuit 500
Direct current carry out voltage sample, and obtained voltage sample value is sent to control circuit 400.
Second sample circuit 300 is sampled to obtain current sampling data concurrent for the electric current of the sampled resistance 200 of convection current
It send to control circuit 400.Specifically, for the directly sampled output of resistance 200 of the direct current of access to inverter circuit 500, inversion is electric
Road 500 is handled to obtain exchange electricity output to motor to the direct current of access again, therefore the electric current of the sampled resistance 200 of convection current
The current running current of motor can be characterized by carrying out sampling, and the electric current of the sampled resistance 200 of 300 convection current of the second sample circuit is adopted
Sample, and obtained current sampling data is sent to control circuit 400.It is appreciated that the second sample circuit 300 can be directly to sampling
The electric current at 200 both ends of resistance is sampled to obtain sample rate current, can also be sampled to obtain to the voltage at 200 both ends of sampling resistor
After corresponding voltage, sample rate current is calculated further according to corresponding voltage.
Control circuit 400 is used to receive the voltage sample value and the second sample circuit 300 hair of the first sample circuit 100 transmission
The current sampling data sent, and the current rotating speed of motor is calculated according to current sampling data and voltage sample value；In current rotating speed
Greater than preset rated speed and when current rotating speed is less than preset rotating speed of target, ovennodulation processing is carried out to inverter circuit 500,
Increase the output voltage of inverter circuit 500, rated speed can be the default rated speed of compressor electric motor default setting,
It can be the rated speed that user is arranged according to the actual situation.Specifically, control circuit 400, which can be, is stored with pre-set programs and patrols
The controller or processor collected, after control circuit 400 receives voltage sample value and current sampling data, according to current sampling data meter
Calculation obtains the machine winding current of motor, and the current rotating speed of motor, electricity are calculated further according to voltage sample value and machine winding current
The current rotating speed of machine can be exported by the result of position estimation.It is greater than preset rated speed in current rotating speed and current rotating speed is small
When preset rotating speed of target, i.e. the current rotating speed of motor reaches preset rated speed, but when also needing to increase speed, then controls
Circuit 400 by inverter circuit 500 carry out ovennodulation processing, increase the output voltage of inverter circuit 500, thus by
By increasing the voltage of motor to increase the revolving speed of motor in the case that the electric current of motor is constant, particularly due to single sampling resistor
Reason, current sample do not need all to open when progress in the lower bridge arm of inverter circuit 500, reduce the lower bridge of inverter circuit 500
The minimum service time of arm, as long as there is the output of effective voltage vector, so that it may be sampled, not need to reserve special zero vector
Time improves the voltage utilization of inverter circuit 500.
The driving control system of above-mentioned motor, including the first sample circuit, sampling resistor.Second sample circuit, control electricity
Road and inverter circuit, the first sample circuit are connect by sampling resistor with inverter circuit, and inverter circuit connects motor, the second sampling
Circuit connection sampling resistor, control circuit connect the first sample circuit, the second sample circuit and inverter circuit, the first sample circuit
Voltage sample value is obtained for the direct current progress voltage sample to access inverter circuit and is sent to control circuit；Second sampling
Electric current of the circuit for the sampled resistance of convection current is sampled to obtain current sampling data；Control circuit is for receiving the first sampling electricity
The current sampling data that the voltage sample value and the second sample circuit that road is sent are sent, and according to current sampling data and voltage sample value
The current rotating speed of motor is calculated；It is greater than preset rated speed in current rotating speed and current rotating speed is less than preset target turn
When fast, ovennodulation processing is carried out to inverter circuit, increases the output voltage of inverter circuit.Pass through the first sample circuit and second
Sample circuit samples respectively obtains voltage sample value and current sampling data, and control circuit is according to current sampling data and voltage sample value
The current rotating speed of motor is calculated, is greater than preset rated speed in current rotating speed and current rotating speed is less than preset target turn
When fast, ovennodulation processing is carried out to inverter circuit, increases the output voltage of inverter circuit, so that the revolving speed in motor is greater than in advance
If rated speed and in the case where also needing to continue to lift up revolving speed, moreover it is possible to continue to control the revolving speed of motor, increase motor and turn
Fast control range improves control convenience, and avoids the problem of output voltage loses.
In one embodiment, control circuit 400 is used to be greater than preset rated speed and current rotating speed in current rotating speed
When less than preset rotating speed of target, weak magnetic control is carried out to motor, to increase the revolving speed of motor, i.e., is greater than in current rotating speed default
Rated speed and current rotating speed be less than preset rotating speed of target when, can by inverter circuit carry out ovennodulation processing, make inverse
The output voltage on power transformation road increases, can also be by carrying out weak magnetic control to motor, to increase the revolving speed of motor, to increase electricity
The machine range of speed control avoids the problem of output voltage loses when carrying out current sample using single resistance.Control circuit 400 is also
When for the current rotating speed in motor after ovennodulation is handled still less than preset rotating speed of target, weak magnetic control is carried out to motor,
To increase the revolving speed of motor.Specifically, it is greater than preset rated speed in current rotating speed and current rotating speed is less than preset target
When revolving speed carries out ovennodulation to inverter circuit 500, when the output voltage of inverter circuit 500 cannot increase again, and motor is worked as
When preceding revolving speed is still less than preset rotating speed of target, then weak magnetic control is carried out to motor, by the way that demagnetization current is added in compressor D axis
To offset counter electromotive force, to increase the electric current of motor, and on the basis of increasing electric current, output torque is suitably promoted, thus
It can continue to increase speed.
In one embodiment, as shown in Fig. 2, the first sample circuit 100 includes first resistor 120 and second resistance 140,
One end connect inverter circuit 500 after first resistor 120 and second resistance 140 are connected, other end connection sampling resistor 200, and first
Resistance 120 connects control circuit 500 with the common end of second resistance 140.Specifically, by double resistance forms to access inversion electricity
The direct current on road 500 carries out voltage sample and obtains the common end for passing through first resistor 120 and second resistance 140 after voltage sample value
Voltage sample value is sent to control circuit 500.
In one embodiment, as shown in figure 3, the second sample circuit 300 includes first resistor component 320, second resistance
Component 340, operational amplifier 360 and feedback resistance R12, first resistor component 320 connect the homophase input of operational amplifier 360
End, second resistance component 340 connect the inverting input terminal of operational amplifier 360, and first resistor component 320 connects sampling resistor
200 one end, second resistance component 340 connect the other end of sampling resistor 200, and the inverting input terminal of operational amplifier 360 is logical
The output end of feedback resistance R12 connection operational amplifier 360 is crossed, the output end of operational amplifier 360 connects control circuit 400.
Specifically, first resistor component 320 includes R7 and R8, and second resistance component 340 includes R9 and R10, flows through sampling resistor 200
Voltage is input to operational amplifier 360, operation after first resistor component 320 and second resistance component 340 amplify again
Output is extremely controlled after amplifier 360 carries out operation amplifier to the voltage of the output of first resistor component 320 and second resistance component 340
Circuit 400 processed, feedback resistance R12 are negative feedback resistor, the electricity that the signal of reverse input end input is exported from output end, but exported
Pressure be it is unstable, then feed back to reverse input end through feedback resistance R12, reverse input end exports again again, negative-feedback electricity
Resistance R12 can maintain stable output voltage.
Further, as shown in figure 3, the second sample circuit 300 further includes filter capacitor C5, C6, C7 and C8 and resistance
R11, filter capacitor C5 latter end ground connection in parallel with resistance R11, the other end connect the non-inverting input terminal of operational amplifier 360, filter
Wave one end capacitor C6 ground connection, the other end connect the inverting input terminal of operational amplifier, the one end filter capacitor C7 ground connection, and the other end connects
The inverting input terminal of operational amplifier 360 is connect, one end connect operational amplifier after filter capacitor C8 is in parallel with feedback resistance R12
360 inverting input terminal, the other end connect the output end of operational amplifier 360.
In one embodiment, as shown in Fig. 2, system further includes rectifier 600, rectifier 600 passes through sampling resistor 200
Inverter circuit 500 is connected, the first sample circuit 100 connects rectifier 600, and rectifier 600 accesses alternating current and rectified to obtain
Direct current is simultaneously exported from the outlet side of rectifier 600.What it is due to driving control system access is alternating current, passes through rectifier
The alternating current of 600 pairs of accesses carries out rectification and handles to export by outlet side again after obtaining direct current.
In one embodiment, as shown in Fig. 2, system further includes filter capacitor 700, filter capacitor 700 is parallel to rectification
The outlet side of device 600.The promotion of AC ripple ripple coefficient can be reduced by connecting filter capacitor 600 at 600 both ends of rectifier
Efficient smooth direct current output.
In one embodiment, as shown in figure 4, providing a kind of drive control method of motor, the method includes steps
Rapid S100, step S200 and step S300.
Step S100 obtains the first sample circuit and carries out the voltage that voltage sample obtains to the direct current of access inverter circuit
The current sampling data that the electric current of sampled value and the second sampled resistance of sample circuit convection current is sampled.
First sample circuit is used to carry out the direct current of access inverter circuit voltage sample to obtain voltage sample value.Specifically
Ground, the first sample circuit are connect by sampling resistor with inverter circuit, and inverter circuit connects motor, and the direct current of access directly passes through
Sampling resistor is exported to inverter circuit, and inverter circuit is handled to obtain exchange electricity output to motor to the direct current of access again,
Therefore the current running voltage of motor, the first sample circuit pair can be characterized by carrying out voltage sample to the direct current of access inverter circuit
The direct current of access inverter circuit carries out voltage sample and obtains voltage sample value.
Electric current of second sample circuit for the sampled resistance of convection current is sampled to obtain current sampling data.Specifically,
Two sample circuits connect sampling resistor, and the directly sampled resistance of the direct current of access is exported to inverter circuit, and inverter circuit is right again
The direct current of access is handled to obtain exchange electricity output to motor, thus the electric current of the sampled resistance of convection current carry out sampling can table
The current running current of motor is levied, the electric current of the second sampled resistance of sample circuit convection current is sampled to obtain current sampling data.
It is appreciated that the second sample circuit can the electric current directly to sampling resistor both ends sampled to obtain sample rate current, can also be to adopting
The voltage at sample resistance both ends is sampled after obtaining corresponding voltage, calculates sample rate current further according to corresponding voltage.
The current rotating speed of motor is calculated according to the voltage sample value and the current sampling data by step S200.
Obtain the first sample circuit to the direct current of access inverter circuit carry out the obtained voltage sample value of voltage sample and
After the current sampling data that the electric current of the second sampled resistance of sample circuit convection current is sampled, first counted according to current sampling data
Calculation obtains the machine winding current of motor, then the current rotating speed of motor is calculated by machine winding current and voltage sample value.
Step S300 is greater than preset rated speed in the current rotating speed and the current rotating speed is less than preset target
When revolving speed, ovennodulation processing is carried out to the inverter circuit, increases the output voltage of the inverter circuit.
Specifically, after getting voltage sample value and current sampling data, the electricity of motor is calculated according to current sampling data
Machine winding current calculates the current rotating speed of motor further according to voltage sample value and machine winding current, and the current rotating speed of motor can
It is exported by the result of position estimation.It is greater than preset rated speed in current rotating speed and current rotating speed is less than preset target turn
When fast, i.e. the current rotating speed of motor reaches preset rated speed, but when also needing to increase speed, then by carrying out to inverter circuit
Ovennodulation processing, increases the output voltage of inverter circuit, thus by passing through increase in the case where the electric current of motor is constant
The voltage of motor is to increase the revolving speed of motor, particularly due to current sample is not needed in inverter circuit the reason of single sampling resistor
Lower bridge arm all open when progress, the minimum service time of the lower bridge arm of inverter circuit is reduced, as long as there is effective voltage vector
Output, so that it may be sampled, not need to reserve special zero vector time, improve the voltage utilization of inverter circuit.
The drive control method of above-mentioned motor is sampled respectively by the first sample circuit and the second sample circuit and obtains voltage
The current rotating speed of motor is calculated according to current sampling data and voltage sample value, is working as forward for sampled value and current sampling data
Speed carries out ovennodulation processing greater than preset rated speed and when current rotating speed is less than preset rotating speed of target, to inverter circuit,
Increase the output voltage of inverter circuit, thus motor revolving speed be greater than preset rated speed and also need to continue to lift up turn
In the case where speed, moreover it is possible to continue to control the revolving speed of motor, increases motor speed control range, improve control convenience, and
The problem of avoiding output voltage loss.
In one embodiment, as shown in figure 5, step S200 includes step S220 and step S240.
The machine winding current of motor is calculated according to current sampling data by step S220.
It gets the first sample circuit and the voltage sample value that voltage sample obtains is carried out to the direct current of access inverter circuit
After the current sampling data sampled with the electric current of the second sampled resistance of sample circuit convection current, according to current sampling data meter
Calculation obtains the machine winding current of motor, and machine winding current is the input current of motor, by being calculated according to current sampling data
Machine winding current is obtained, the current running current of motor can be reflected from the machine winding current being calculated.
The current rotating speed of motor is calculated according to machine winding current and voltage sample value by step S240.
The current rotating speed of motor is calculated, according to the machine winding current and voltage sample value that are calculated so as to root
The revolving speed of motor is adjusted according to the current rotating speed and preset rated speed and preset rotating speed of target of motor.
In one embodiment, as shown in fig. 6, further including step S400 after step S300.
Step S400 is greater than preset rated speed in the current rotating speed of motor and current rotating speed is less than preset target turn
When fast, weak magnetic control is carried out to motor, to increase the revolving speed of motor.
When current rotating speed is greater than preset rated speed and current rotating speed is less than preset rotating speed of target, motor is carried out
Weak magnetic control is greater than preset rated speed in current rotating speed and current rotating speed is less than preset to increase the revolving speed of motor
When rotating speed of target, the output voltage of inverter circuit can be made to increase, can also be passed through by carrying out ovennodulation processing to inverter circuit
Weak magnetic control is carried out to motor, to increase the revolving speed of motor, to increase motor speed control range, avoids and utilizes single resistance
Carry out the problem of output voltage loses when current sample.Further, it is greater than preset rated speed and current in current rotating speed
When revolving speed is less than preset rotating speed of target to inverter circuit progress ovennodulation, when the output voltage of inverter circuit cannot increase again
When, and when the current rotating speed of motor is still less than preset rotating speed of target, then weak magnetic control is carried out to motor, by compressor D
Demagnetization current is added to offset counter electromotive force in axis, thus increase the electric current of motor, and on the basis of increasing electric current, it is appropriate to be promoted
Output torque, so as to continue to increase speed.
It in one embodiment, further include step S500 after step S400.
Step S500 is more than or equal to preset rotating speed of target in the current rotating speed of motor and receives revolving speed reduction instruction
When, then weak magnetic control is exited, and ovennodulation processing is carried out to inverter circuit, to reduce the revolving speed of motor.
When carrying out weak magnetic control to motor, with the continuous intensification of weak magnetic depth, when the running current of motor is sufficiently big,
When close to preset limiting value, it is limited to machine winding, driving beginning pipe allows electric current, it is not possible to be added again in compressor D axis
Demagnetization current, cannot also be further continued for expansion speed at this time, and revolving speed maintains limiting value and nearby or suitably slows down, turns to motor
When speed is slowed down, when the current rotating speed of motor is equal to preset rotating speed of target, then weak magnetic control is exited, and to inverter circuit
It carries out ovennodulation processing and that is, when being slowed down, first exits weak magnetic control, and control to reduce the revolving speed of motor with ovennodulation
A period of time is maintained, then exits ovennodulation control.Further, when being slowed down, after exiting weak magnetic control, when working as motor
When preceding revolving speed is less than or equal to preset rated speed, then ovennodulation processing is exited, to reduce the revolving speed of motor, that is, is exiting weak magnetic
After control, then ovennodulation control is exited, into normal motor control mode.
It should be understood that although each step in the flow chart of Fig. 4-6 is successively shown according to the instruction of arrow,
These steps are not that the inevitable sequence according to arrow instruction successively executes.Unless expressly stating otherwise herein, these steps
Execution there is no stringent sequences to limit, these steps can execute in other order.Moreover, at least one in Fig. 4-6
Part steps may include that perhaps these sub-steps of multiple stages or stage are not necessarily in synchronization to multiple sub-steps
Completion is executed, but can be executed at different times, the execution sequence in these sub-steps or stage is also not necessarily successively
It carries out, but can be at least part of the sub-step or stage of other steps or other steps in turn or alternately
It executes.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. a kind of driving control system of motor, which is characterized in that the system comprises the first sample circuit, sampling resistor,
Two sample circuits, control circuit and inverter circuit, first sample circuit pass through the sampling resistor and the inverter circuit
Connection, the inverter circuit connect motor, and second sample circuit connects the sampling resistor, and the control circuit connects institute
The first sample circuit, second sample circuit and the inverter circuit are stated,
First sample circuit is used to obtain voltage sample value to the direct current progress voltage sample for accessing the inverter circuit concurrent
It send to the control circuit；Second sample circuit to the electric current for flowing through the sampling resistor for being sampled to obtain electric current
Sampled value is simultaneously sent to control circuit；
The control circuit is used to receive the voltage sample value that first sample circuit is sent and second sample circuit hair
The current sampling data sent, and work as forward according to what the current sampling data and the voltage sample value were calculated the motor
Speed；When the current rotating speed is greater than preset rated speed and the current rotating speed is less than preset rotating speed of target, to described
Inverter circuit carries out ovennodulation processing, increases the output voltage of the inverter circuit.
2. the driving control system of motor according to claim 1, which is characterized in that the control circuit is also used in institute
Current rotating speed is stated greater than preset rated speed and when the current rotating speed is less than preset rotating speed of target, the motor is carried out
Weak magnetic control, to increase the revolving speed of the motor.
3. the driving control system of motor according to claim 1, which is characterized in that first sample circuit includes the
One end connects the inverter circuit, the other end after one resistance and second resistance, the first resistor and the second resistance are connected
The sampling resistor is connected, the first resistor connects the control circuit with the common end of the second resistance.
4. the driving control system of motor according to claim 1, which is characterized in that second sample circuit includes the
One resistor assembly, second resistance component, operational amplifier and feedback resistance, the first resistor component connect the operation amplifier
The non-inverting input terminal of device, the second resistance component connect the inverting input terminal of the operational amplifier, the first resistor group
Part connects one end of the sampling resistor, and the second resistance component connects the other end of the sampling resistor, and the operation is put
The inverting input terminal of big device connects the output end of the operational amplifier by the feedback resistance, the operational amplifier it is defeated
Outlet connects the control circuit.
5. the driving control system of motor according to claim 1, which is characterized in that the system also includes rectifier,
The rectifier connects the first sample circuit described in the inverter circuit by the sampling resistor and connects the rectifier, described
Rectifier access alternating current is rectified to obtain direct current and be exported from the outlet side of the rectifier.
6. the driving control system of motor according to claim 5, which is characterized in that the system also includes filtered electricals
Hold, the filter capacitor is parallel to the outlet side of the rectifier.
7. a kind of drive control method of motor, which is characterized in that the described method includes:
It obtains the first sample circuit and the voltage sample value and second that voltage sample obtains is carried out to the direct current of access inverter circuit
The current sampling data that the electric current of the sampled resistance of sample circuit convection current is sampled；
The current rotating speed of motor is calculated according to the voltage sample value and the current sampling data；
When the current rotating speed is greater than preset rated speed and the current rotating speed is less than preset rotating speed of target, to described
Inverter circuit carries out ovennodulation processing, increases the output voltage of the inverter circuit.
8. the drive control method of motor according to claim 7, which is characterized in that described according to the voltage sample value
The current rotating speed of motor is calculated with the current sampling data, comprising:
The machine winding current of the motor is calculated according to the current sampling data；
The current rotating speed of the motor is calculated according to the machine winding current and the voltage sample value.
9. the drive control method of motor according to claim 7, which is characterized in that be greater than in the current rotating speed default
Rated speed and the current rotating speed be less than preset rotating speed of target when, to the inverter circuit carry out ovennodulation processing, make
After the output voltage of the inverter circuit increases, further includes:
When the current rotating speed is greater than preset rated speed and the current rotating speed is less than preset rotating speed of target, to described
Motor carries out weak magnetic control, to increase the revolving speed of the motor.
10. the drive control method of motor according to claim 9, which is characterized in that be greater than in the current rotating speed pre-
If rated speed and the current rotating speed be less than preset rotating speed of target when, to the motor carry out weak magnetic control, with increase
After the revolving speed of the motor, further includes:
When the current rotating speed of the motor is more than or equal to preset rotating speed of target and receives revolving speed reduction instruction, then exit weak
Magnetic control, and ovennodulation processing is carried out to the inverter circuit, to reduce the revolving speed of the motor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811087513.5A CN109120205A (en) | 2018-09-17 | 2018-09-17 | Drive control system and method for motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811087513.5A CN109120205A (en) | 2018-09-17 | 2018-09-17 | Drive control system and method for motor |
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| CN109120205A true CN109120205A (en) | 2019-01-01 |
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Application publication date: 20190101 |