CN106549362A - A kind of motor and motor protection method - Google Patents
A kind of motor and motor protection method Download PDFInfo
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- CN106549362A CN106549362A CN201610928865.3A CN201610928865A CN106549362A CN 106549362 A CN106549362 A CN 106549362A CN 201610928865 A CN201610928865 A CN 201610928865A CN 106549362 A CN106549362 A CN 106549362A
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- Prior art keywords
- motor
- electromotive force
- circuit
- releasing
- control circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0811—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for dc motors
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Abstract
The present invention proposes a kind of motor and motor protection method, and the method includes：Release braking circuit and detection control circuit are set between motor switch power supply and motor；Monitor whether the motor occurs power-off by detecting control circuit, the energy of the self induction electromotive force and counter electromotive force of the motor is released by braking circuit of if so, then releasing described in control.A kind of motor of the present invention and motor protection method, the self induction electromotive force and counter electromotive force for being prevented from producing when direct current generator is stalled charge to front end electrochemical capacitor, prevent system switching power supply from restarting after quitting work；The self induction electromotive force and counter electromotive force produced when can stall motor is converted to heat energy quick release, realizes blower fan fast braking.
Description
Technical field
The present invention relates to technical field of motors, more particularly to a kind of motor and motor protection method.
Background technology
At present, brshless DC motor directly operate a switch power-off when, the self induction electromotive force and brushless direct-current of brshless DC motor
The counter electromotive force produced in the flabellum of motor rotary course after a loss of power can produce high voltage, and high voltage can then give brushless direct-current
Other peripheral circuits of motor charge, and cause brushless DC motor system Switching Power Supply to be restarted, or even damage inside direct current generator
Device.
For example：As shown in figure 1, brshless DC motor switching power circuit by electric main 220V through rectifier rectification
The high-voltage DC power supply 310V for producing afterwards is transmitted to brshless DC motor, as brushless DC blower power input while,
Input also as Switching Power Supply produces multiple power supplies, such as 12V, 5V and 15V etc., to ensure each mould of brushless DC motor system
Block normal work.As shown in Fig. 2 brshless DC motor power-off is instantaneous, the self induction electromotive force that brshless DC motor is produced is to motor
The electrochemical capacitor E1 of energization input charges.As shown in figure 3, brshless DC motor power-off is instantaneous, what brshless DC motor was produced
Counter electromotive force charges to the electrochemical capacitor E1 of motor energization input.
Self induction electromotive force or counter electromotive force can be charged to input electrochemical capacitor E1 by three-phase inversion power switch pipe, make
Originally there is the possibility of restarting in out-of-work Switching Power Supply, flash after showing as display screen power down, and relay is moved
The improper phenomenons such as work.Winding insulation damage and power tube inside direct current generator is even caused to puncture.As shown in figure 4, brushless straight
Stream motor power-off is instantaneous, brshless DC motor supply voltage and current waveform figure.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of motor and motor protection method, overcomes of the prior art
The infringement that the self induction electromotive force and counter electromotive force that brshless DC motor momentary power failure is produced is caused to motor internal element.
The present invention provides a kind of motor, including：
Release braking circuit and detect control circuit；
The braking circuit of releasing is connected in parallel between the positive pole and negative pole of motor feeder ear；
The detection control circuit is connected with the motor switch power supply and the braking circuit of releasing respectively；
The detection control circuit, for based on to the motor whether judged result of power-off, to the braking of releasing
Circuit is controlled；
The braking circuit of releasing, for it is described detection control circuit control under, will be the self-induction of the motor electronic
The energy of gesture and counter electromotive force is released.
Further, the motor also includes：Isolation circuit；
The isolation circuit is connected between the positive pole of Switching Power Supply positive pole and motor feeder ear of motor；
The isolation circuit is in the motor power-off, carrying out insulation blocking to the motor switch power supply.
Further, the isolation circuit is diode；
The positive pole of the diode connects the positive pole of the on and off switch power supply；
The negative pole of the diode connects the positive pole of the motor feeder ear.
Further, the braking circuit of releasing includes bleeder resistance and controlled switch；
The braking circuit of releasing is connected in parallel between the positive pole and negative pole of motor feeder ear；
The power detecting end of the detection control circuit is connected with the motor switch power supply, the detection control circuit
Control signal output is connected with the controlled switch of the braking circuit of releasing.
Further, the detection control circuit, specifically for：
If monitoring the motor generation power-off, the controlled switch of braking circuit of releasing described in control is closed, will be described
The energy of the self induction electromotive force and counter electromotive force of motor is released；
If monitoring, the motor occurs to power up, and the controlled switch of braking circuit of releasing described in control is opened.
The present invention also provides a kind of motor protection method, and methods described includes：
Release braking circuit and detection control circuit are set between motor switch power supply and motor；
Monitor whether the motor occurs power-off by detecting control circuit, braking circuit of if so, then releasing described in control
The energy of the self induction electromotive force and counter electromotive force of the motor is released.
Further, methods described, also includes：
In the positive pole and releasing isolation circuit of arrange between braking circuit of motor switch power supply, the isolation circuit for
During the motor power-off, insulation blocking is carried out to the motor switch power supply.
Further, the isolation circuit is diode；
The positive pole of the diode connects the positive pole of the Switching Power Supply；
The negative pole of the diode connects the positive pole of the motor feeder ear.
Further, the braking circuit of releasing includes bleeder resistance and controlled switch；
The middle setting between motor switch power supply and motor is released braking circuit and detects control circuit, including：
The braking circuit of releasing is connected in parallel between the positive pole and negative pole of motor feeder ear；
The power detecting end of the detection control circuit is connected with the motor switch power supply, the detection control circuit
Control signal output is connected with the controlled switch of the braking circuit of releasing.
Further, it is described to monitor whether the motor occurs power-off by detecting control circuit, if so, then control described
The energy of the self induction electromotive force and counter electromotive force of the motor is released by braking circuit of releasing, and specifically includes：
If by detecting that control circuit monitors that the motor occurs power-off, the system of releasing described in detection control circuit control
The controlled switch on galvanic electricity road is closed, and the energy of the self induction electromotive force and counter electromotive force of the motor is released；
If by detecting that control circuit monitors that the motor occurs power-up, the system of releasing described in detection control circuit control
The controlled switch on galvanic electricity road is opened.
Using above-mentioned technical proposal, the present invention at least has following advantages：
A kind of motor of the present invention and motor protection method, the self-induction for being prevented from producing when direct current generator is stalled are electronic
Gesture and counter electromotive force charge to front end electrochemical capacitor, prevent system switching power supply from restarting after quitting work；Motor can be stalled
When the self induction electromotive force that produces and counter electromotive force be converted to heat energy quick release, realize blower fan fast braking.
Description of the drawings
Fig. 1 is the direct current generator schematic diagram of prior art of the present invention；
Fig. 2 is the self induction electromotive force direction of prior art of the present invention and effect schematic diagram；
Fig. 3 is the counter electromotive force direction of prior art of the present invention and effect schematic diagram；
Fig. 4 is the brshless DC motor power-off momentary power voltage and current oscillogram of prior art of the present invention；
Motor protection method flow charts of the Fig. 5 for first embodiment of the invention；
Motor protective circuit schematic diagrams of the Fig. 6 for second embodiment of the invention；
Motor protection method flow charts of the Fig. 7 for second embodiment of the invention；
Motor composition structural representations of the Fig. 8 for third embodiment of the invention；
Motor composition structural representations of the Fig. 9 for fourth embodiment of the invention.
Specific embodiment
Further to illustrate the present invention to reach technological means and effect that predetermined purpose is taken, below in conjunction with accompanying drawing
And preferred embodiment, the present invention is described in detail as after.
First embodiment of the invention, a kind of motor protection method, as shown in figure 5, including step in detail below：
Step S101, arranges release braking circuit and detection control circuit between motor switch power supply and motor.
Wherein, braking circuit of releasing includes bleeder resistance and controlled switch；
Braking circuit of releasing is connected in parallel between the positive pole and negative pole of motor feeder ear；
The power detecting end of detection control circuit is connected with motor switch power supply, detects the control signal output of control circuit
End is connected with the controlled switch of braking circuit of releasing.
For example：Braking circuit of releasing is connected in parallel between the positive pole and negative pole of motor feeder ear；Braking circuit of releasing includes：String
The bleeder resistance RL and controlled switch K1 of connection.
By detecting control circuit, step S102, monitors whether motor occurs power-off, if so, then control braking circuit of releasing
The energy of the self induction electromotive force and counter electromotive force of motor is released.
Specifically, step S102, including：
If by detecting that control circuit monitors that motor occurs power-off, detection control circuit controls braking circuit of releasing
Controlled switch is closed, and the energy of the self induction electromotive force and counter electromotive force of motor is released；
If by detecting that control circuit monitors that motor occurs power-up, detection control circuit controls braking circuit of releasing
Controlled switch is opened.
When the generation power-off of brshless DC motor, in brshless DC motor there is the winding structure on iron core in stator and armature
Into inductance, when in the inductance that winding is constituted, electric current is changed, the inductance that winding is constituted will produce self induction electromotive force.From electrification
Kinetic potential direction is judged that by Lenz's law self induction electromotive force always hinders the change of electric current.When electric current in the inductance that winding is constituted
During increase, self induction electromotive force direction increases to hinder electric current；When in the inductance that winding is constituted, electric current is reduced, self induction electromotive force side
To for hinder electric current reduce；Therefore, during brshless DC motor power-off, self induction electromotive force direction is electronic with brushless dc electromechanical source
Gesture direction is identical, and the inductive current direction that its winding is constituted is consistent with power-off transient current direction, hinders electric current in inductor winding
Reduction.Self induction electromotive force E ' estimate as the following formula：
E '=L × dI/dt
E ' is self induction electromotive force；L is the inductance value that direct current generator winding is constituted；Curent changes of the dI/dt for direct current generator
Rate；I is the electric current that direct current generator is instantaneously flow through in power-off.
The size of self induction electromotive force depends on the intrinsic parameter of direct current generator, and the curent change of the instantaneous direct current generator of power-off
Rate.
If not having self induction electromotive force to produce the loop of electric current, self induction electromotive force is up to very high numerical value, or even can be high
In direct current generator supply voltage switch VCC.
But self induction electromotive force only works in shutdown transient, last till that the energy being stored in direct current generator coil is discharged
Till, after power-off, in very short time, self induction electromotive force is higher than counter electromotive force, and electric current flows according to former direction, i.e. self induction electromotive force pair
Rotor does work, and rotor should accelerate, but the energy of direct current generator winding magnetic field storage compares with rotor inertia energy storage
Much smaller, the self induction electromotive force persistent period is very short, therefore the rotor acceleration time is very short.Therefore, self induction electromotive force is in shutdown transient
Work, self induction electromotive force numerical value is very high but the persistent period is extremely short.
When the working condition of brshless DC motor is working condition, brshless DC motor Running at a constant speed.
VCC=E+IR+ Δ U
VCC is brshless DC motor supply voltage switch；E is counter electromotive force；I is armature supply；R is armature resistance；ΔU
It is the brush pressure drop of brshless DC motor.
When the working condition of brshless DC motor is working condition, counter electromotive force E is less than brshless DC motor Switching Power Supply
Voltage.
Counter electromotive force be due to when brshless DC motor is rotated, what winding conductor cutting magnetic line was produced, brushless dc
Machine does not turn then no counter electromotive force.Counter electromotive force direction in direct current generator normal work with Switching Power Supply electromotive force direction phase
Instead.Direct current generator direction of rotation is constant, and counter electromotive force direction is also constant.
When the working condition of brshless DC motor is working condition, the machinery inertial of brushless DC motor rotor and load is dragged
Dynamic rotor is rotated further, till counter electromotive force is produced and lasts till that brshless DC motor stops.Rotor rotates faster, anti-electronic
Gesture is bigger.Therefore, counter electromotive force is maximum in the moment of power-off, and counter electromotive force reduces with the reduction of brshless DC motor rotating speed,
Counter electromotive force maximum is less than direct current generator supply voltage switch VCC.
When by detecting that control circuit monitors that motor occurs power-off, detection control circuit controls braking circuit of releasing
Controlled switch K1 is closed, and the braking circuit of releasing that self induction electromotive force and counter electromotive force can only be consisted of K1 and RL is converted electrical energy into
Energy is discharged by the heat energy for RL.During self induction electromotive force and counter electromotive force are released, self induction electromotive force is only instantaneous in power-off
Play a major role in very short time afterwards, hereafter counter electromotive force is in overall process of the DC motor rotor coasting until stalling
Play a major role, self induction electromotive force is there is also during direct current generator electric current is tapered into, but do not played a major role.
When detecting that control circuit monitors that motor occurs power-up, detection control circuit controls the controlled of braking circuit of releasing
Switch K1 is opened, motor normal work.
Second embodiment of the invention, a kind of motor protection method, as shown in Figure 6 and Figure 7, the methods described bag of the present embodiment
Include step in detail below：
Step S201, arranges release braking circuit and detection control circuit between motor switch power supply and motor.
Wherein, braking circuit of releasing includes bleeder resistance and controlled switch；
Braking circuit of releasing is connected in parallel between the positive pole and negative pole of motor feeder ear；
The power detecting end of detection control circuit is connected with motor switch power supply, detects the control signal output of control circuit
End is connected with the controlled switch of braking circuit of releasing.
For example：As shown in fig. 6, braking circuit of releasing is connected in parallel between the positive pole and negative pole of motor feeder ear；Release braking
Circuit includes：The bleeder resistance RL and controlled switch K1 of series connection.
Step S202, in the positive pole and releasing isolation circuit of arrange between braking circuit of motor switch power supply.
Wherein, isolation circuit is in motor power-off, carrying out insulation blocking to motor switch power supply.
Isolation circuit is diode；
The positive pole of the positive pole connecting valve power supply of diode；
The negative pole of diode connects the positive pole of motor feeder ear.
For example, as shown in fig. 6, in the positive pole and releasing isolation circuit of arrange between braking circuit of motor switch power supply.
Wherein, isolation circuit is in motor power-off, carrying out insulation blocking to motor switch power supply.
Isolation circuit is diode D1；
The positive pole of the positive pole connecting valve power supply of diode D1；
The negative pole of diode D1 connects the positive pole of motor feeder ear.
Isolation circuit D1 blocks the charging of self induction electromotive force and counter electromotive force to Switching Power Supply VCC
By detecting control circuit, step S203, monitors whether motor occurs power-off, if so, then control braking circuit of releasing
The energy of the self induction electromotive force and counter electromotive force of motor is released.
Specifically, step S203, including：
If by detecting that control circuit monitors that motor occurs power-off, detection control circuit controls braking circuit of releasing
Controlled switch is closed, and the energy of the self induction electromotive force and counter electromotive force of motor is released；
If by detecting that control circuit monitors that motor occurs power-up, detection control circuit controls braking circuit of releasing
Controlled switch is opened.
When the generation power-off of brshless DC motor, in brshless DC motor there is the winding structure on iron core in stator and armature
Into inductance, when in the inductance that winding is constituted, electric current is changed, the inductance that winding is constituted will produce self induction electromotive force.From electrification
Kinetic potential direction is judged that by Lenz's law self induction electromotive force always hinders the change of electric current.When electric current in the inductance that winding is constituted
During increase, self induction electromotive force direction increases to hinder electric current；When in the inductance that winding is constituted, electric current is reduced, self induction electromotive force side
To for hinder electric current reduce；Therefore, during brshless DC motor power-off, self induction electromotive force direction is electronic with brushless dc electromechanical source
Gesture direction is identical, and the inductive current direction that its winding is constituted is consistent with power-off transient current direction, hinders electric current in inductor winding
Reduction.Self induction electromotive force E ' estimate as the following formula：
E '=L × dI/dt
E ' is self induction electromotive force；L is the inductance value that direct current generator winding is constituted；Curent changes of the dI/dt for direct current generator
Rate；I is the electric current that direct current generator is instantaneously flow through in power-off.
The size of self induction electromotive force depends on the intrinsic parameter of direct current generator, and the curent change of the instantaneous direct current generator of power-off
Rate.
If not having self induction electromotive force to produce the loop of electric current, self induction electromotive force is up to very high numerical value, or even can be high
In direct current generator supply voltage switch VCC.
But self induction electromotive force only works in shutdown transient, last till that the energy being stored in direct current generator coil is discharged
Till, after power-off, in very short time, self induction electromotive force is higher than counter electromotive force, and electric current flows according to former direction, i.e. self induction electromotive force pair
Rotor does work, and rotor should accelerate, but the energy of direct current generator winding magnetic field storage compares with rotor inertia energy storage
Much smaller, the self induction electromotive force persistent period is very short, therefore the rotor acceleration time is very short.Therefore, self induction electromotive force is in shutdown transient
Work, self induction electromotive force numerical value is very high but the persistent period is extremely short.
When the working condition of brshless DC motor is working condition, brshless DC motor Running at a constant speed.
VCC=E+IR+ Δ U
VCC is brshless DC motor supply voltage switch；E is counter electromotive force；I is armature supply；R is armature resistance；ΔU
It is the brush pressure drop of brshless DC motor.
When the working condition of brshless DC motor is working condition, counter electromotive force E is less than brshless DC motor Switching Power Supply
Voltage.
Counter electromotive force be due to when brshless DC motor is rotated, what winding conductor cutting magnetic line was produced, brushless dc
Machine does not turn then no counter electromotive force.Counter electromotive force direction is in opposite direction with electromotive force of source in direct current generator normal work.Directly
Stream motor direction of rotation is constant, and counter electromotive force direction is also constant.
When the working condition of brshless DC motor is working condition, the machinery inertial of brushless DC motor rotor and load is dragged
Dynamic rotor is rotated further, till counter electromotive force is produced and lasts till that brshless DC motor stops.Rotor rotates faster, anti-electronic
Gesture is bigger.Therefore, counter electromotive force is maximum in the moment of power-off, and counter electromotive force reduces with the reduction of brshless DC motor rotating speed,
Counter electromotive force maximum is less than direct current generator supply voltage switch VCC.
When by detecting that control circuit monitors that motor occurs power-off, detection control circuit controls braking circuit of releasing
Controlled switch K1 is closed, and the braking circuit of releasing that self induction electromotive force and counter electromotive force can only be consisted of K1 and RL is converted electrical energy into
Energy is discharged by the heat energy for RL.During self induction electromotive force and counter electromotive force are released, self induction electromotive force is only instantaneous in power-off
Play a major role in very short time afterwards, hereafter counter electromotive force is in overall process of the DC motor rotor coasting until stalling
Play a major role, self induction electromotive force is there is also during direct current generator electric current is tapered into, but do not played a major role.Cause
This, direct current generator is instantaneous in power-off, will not have induction electromotive force to charge to Switching Power Supply VCC, while rapid to brushless dc
Machine is braked.
When detecting that control circuit monitors that motor occurs power-up, detection control circuit controls the controlled of braking circuit of releasing
Switch K1 is opened, motor normal work.
Third embodiment of the invention, the present embodiment introduce a kind of motor, as shown in figure 8, including consisting of part：
Motor switch power supply, release braking circuit and detection control circuit；
Braking circuit of releasing is connected in parallel between the positive pole and negative pole of motor feeder ear；
Detection control circuit is connected with motor switch power supply and braking circuit of releasing respectively；
Detection control circuit, for based on to the motor whether judged result of power-off, braking circuit is controlled to releasing；
Release braking circuit, under the control of detection control circuit, by the self induction electromotive force and counter electromotive force of motor
Energy released.
Wherein, braking circuit of releasing includes bleeder resistance RL and controlled switch K1；
Braking circuit of releasing is connected in parallel between the positive pole and negative pole of motor feeder ear；
The power detecting end of detection control circuit is connected with motor switch power supply, detects the control signal output of control circuit
End is connected with the controlled switch K1 of braking circuit of releasing.
Detection control circuit, specifically for：
If monitor motor occur power-off, control release braking circuit controlled switch K1 close, by the self-induction of motor
The energy of electromotive force and counter electromotive force is released；
If monitor motor occur power-up, control release braking circuit controlled switch K1 open.
For example：When detecting that control circuit monitors that motor occurs power-off, in brshless DC motor, stator and armature are present
Winding on iron core constitutes inductance, and when in the inductance that winding is constituted, electric current is changed, the inductance that winding is constituted will be produced from
Induction electromotive force.Self induction electromotive force direction is judged that by Lenz's law self induction electromotive force always hinders the change of electric current.When winding structure
Into inductance in electric current increase when, self induction electromotive force direction for hinder electric current increase；When in the inductance that winding is constituted, electric current is reduced
When, self induction electromotive force direction is reduced to hinder electric current；Therefore, during brshless DC motor power-off, self induction electromotive force direction with it is brushless
DC motor power electromotive force direction is identical, and the inductive current direction that its winding is constituted is consistent with power-off transient current direction, resistance
Hinder the reduction of electric current in inductor winding.Self induction electromotive force E ' estimate as the following formula：
E '=L × dI/dt
E ' is self induction electromotive force；L is the inductance value that direct current generator winding is constituted；Curent changes of the dI/dt for direct current generator
Rate；I is the electric current that direct current generator is instantaneously flow through in power-off.
The size of self induction electromotive force depends on the intrinsic parameter of direct current generator, and the curent change of the instantaneous direct current generator of power-off
Rate.
If not having self induction electromotive force to produce the loop of electric current, self induction electromotive force is up to very high numerical value, or even can be high
In direct current generator supply voltage switch VCC.
But self induction electromotive force only works in shutdown transient, last till that the energy being stored in direct current generator coil is discharged
Till, after power-off, in very short time, self induction electromotive force is higher than counter electromotive force, and electric current flows according to former direction, i.e. self induction electromotive force pair
Rotor does work, and rotor should accelerate, but the energy of direct current generator winding magnetic field storage compares with rotor inertia energy storage
Much smaller, the self induction electromotive force persistent period is very short, therefore the rotor acceleration time is very short.Therefore, self induction electromotive force is in shutdown transient
Work, self induction electromotive force numerical value is very high but the persistent period is extremely short.
When the working condition of brshless DC motor is working condition, brshless DC motor Running at a constant speed.
VCC=E+IR+ Δ U
VCC is brshless DC motor supply voltage switch；E is counter electromotive force；I is armature supply；R is armature resistance；ΔU
It is the brush pressure drop of brshless DC motor.
When the working condition of brshless DC motor is working condition, counter electromotive force E is less than brshless DC motor Switching Power Supply
Voltage.
Counter electromotive force be due to when brshless DC motor is rotated, what winding conductor cutting magnetic line was produced, brushless dc
Machine does not turn then no counter electromotive force.Counter electromotive force direction is in opposite direction with electromotive force of source in direct current generator normal work.Directly
Stream motor direction of rotation is constant, and counter electromotive force direction is also constant.
When the working condition of brshless DC motor is working condition, the machinery inertial of brushless DC motor rotor and load is dragged
Dynamic rotor is rotated further, till counter electromotive force is produced and lasts till that brshless DC motor stops.Rotor rotates faster, anti-electronic
Gesture is bigger.Therefore, counter electromotive force is maximum in the moment of power-off, and counter electromotive force reduces with the reduction of brshless DC motor rotating speed,
Counter electromotive force maximum is less than direct current generator supply voltage switch VCC.
When detecting that control circuit monitors that motor occurs power-off, detection control circuit controls the controlled of braking circuit of releasing
Switch K1 is closed, and the braking circuit of releasing that self induction electromotive force and counter electromotive force can only be consisted of K1 and RL converts electrical energy into RL
Heat energy energy is discharged.During self induction electromotive force and counter electromotive force are released, self induction electromotive force is only after power-off is instantaneous
Play a major role in very short time, hereafter counter electromotive force plays master in DC motor rotor coasting in the overall process for stalling
Act on, self induction electromotive force is there is also during direct current generator electric current is tapered into, but do not played a major role.Therefore, directly
Stream motor is instantaneous in power-off, and rapidly brshless DC motor is braked.
When detecting that control circuit monitors that motor occurs power-up, detection control circuit controls the controlled of braking circuit of releasing
Switch K1 is opened, motor normal work.
Fourth embodiment of the invention, the present embodiment introduce a kind of motor, as shown in figure 9, including consisting of part：
Motor switch power supply, braking circuit of releasing, isolation circuit and detection control circuit；
Braking circuit of releasing is connected in parallel between the positive pole and negative pole of motor feeder ear；
Isolation circuit is connected between the positive pole of Switching Power Supply positive pole and motor feeder ear of motor；
Detection control circuit is connected with motor switch power supply and braking circuit of releasing respectively；
Detection control circuit, for based on to the motor whether judged result of power-off, braking circuit is controlled to releasing；
Release braking circuit, under the control of detection control circuit, by the self induction electromotive force and counter electromotive force of motor
Energy released；
Isolation circuit, in motor power-off, carrying out insulation blocking to motor switch power supply.
Wherein, isolation circuit is diode D1；
The positive pole of diode D1 connects the positive pole of on and off switch power supply；
The negative pole of diode D1 connects the positive pole of motor feeder ear.
Braking circuit of releasing includes bleeder resistance RL and controlled switch K1；
Braking circuit of releasing is connected in parallel between the positive pole and negative pole of motor feeder ear；
The power detecting end of detection control circuit is connected with motor switch power supply, detects the control signal output of control circuit
End is connected with the controlled switch K1 of braking circuit of releasing.
Detection control circuit, specifically for：
If monitor motor occur power-off, control release braking circuit controlled switch K1 close, by the self-induction of motor
The energy of electromotive force and counter electromotive force is released；
If monitor motor occur power-up, control release braking circuit controlled switch K1 open.
For example：When detecting that control circuit monitors that motor occurs power-off, in brshless DC motor, stator and armature are present
Winding on iron core constitutes inductance, and when in the inductance that winding is constituted, electric current is changed, the inductance that winding is constituted will be produced from
Induction electromotive force.Self induction electromotive force direction is judged that by Lenz's law self induction electromotive force always hinders the change of electric current.When winding structure
Into inductance in electric current increase when, self induction electromotive force direction for hinder electric current increase；When in the inductance that winding is constituted, electric current is reduced
When, self induction electromotive force direction is reduced to hinder electric current；Therefore, during brshless DC motor power-off, self induction electromotive force direction with it is brushless
DC motor power electromotive force direction is identical, and the inductive current direction that its winding is constituted is consistent with power-off transient current direction, resistance
Hinder the reduction of electric current in inductor winding.Self induction electromotive force E ' estimate as the following formula：
E '=L × dI/dt
E ' is self induction electromotive force；L is the inductance value that direct current generator winding is constituted；Curent changes of the dI/dt for direct current generator
Rate；I is the electric current that direct current generator is instantaneously flow through in power-off.
The size of self induction electromotive force depends on the intrinsic parameter of direct current generator, and the curent change of the instantaneous direct current generator of power-off
Rate.
If not having self induction electromotive force to produce the loop of electric current, self induction electromotive force is up to very high numerical value, or even can be high
In direct current generator supply voltage switch VCC.
But self induction electromotive force only works in shutdown transient, last till that the energy being stored in direct current generator coil is discharged
Till, after power-off, in very short time, self induction electromotive force is higher than counter electromotive force, and electric current flows according to former direction, i.e. self induction electromotive force pair
Rotor does work, and rotor should accelerate, but the energy of direct current generator winding magnetic field storage compares with rotor inertia energy storage
Much smaller, the self induction electromotive force persistent period is very short, therefore the rotor acceleration time is very short.Therefore, self induction electromotive force is in shutdown transient
Work, self induction electromotive force numerical value is very high but the persistent period is extremely short.
When the working condition of brshless DC motor is working condition, brshless DC motor Running at a constant speed.
VCC=E+IR+ Δ U
VCC is brshless DC motor supply voltage switch；E is counter electromotive force；I is armature supply；R is armature resistance；ΔU
It is the brush pressure drop of brshless DC motor.
When the working condition of brshless DC motor is working condition, counter electromotive force E is less than brshless DC motor Switching Power Supply
Voltage.
Counter electromotive force be due to when brshless DC motor is rotated, what winding conductor cutting magnetic line was produced, brushless dc
Machine does not turn then no counter electromotive force.Counter electromotive force direction is in opposite direction with electromotive force of source in direct current generator normal work.Directly
Stream motor direction of rotation is constant, and counter electromotive force direction is also constant.
When the working condition of brshless DC motor is working condition, the machinery inertial of brushless DC motor rotor and load is dragged
Dynamic rotor is rotated further, till counter electromotive force is produced and lasts till that brshless DC motor stops.Rotor rotates faster, anti-electronic
Gesture is bigger.Therefore, counter electromotive force is maximum in the moment of power-off, and counter electromotive force reduces with the reduction of brshless DC motor rotating speed,
Counter electromotive force maximum is less than direct current generator supply voltage switch VCC.
When detecting that control circuit monitors that motor occurs power-off, detection control circuit controls the controlled of braking circuit of releasing
Switch K1 is closed, and the braking circuit of releasing that self induction electromotive force and counter electromotive force can only be consisted of K1 and RL converts electrical energy into RL
Heat energy energy is discharged.During self induction electromotive force and counter electromotive force are released, self induction electromotive force is only after power-off is instantaneous
Play a major role in very short time, hereafter counter electromotive force plays master in DC motor rotor coasting in the overall process for stalling
Act on, self induction electromotive force is there is also during direct current generator electric current is tapered into, but do not played a major role.Therefore, directly
Stream motor is instantaneous in power-off, will not have induction electromotive force to charge to Switching Power Supply VCC, while carrying out to brshless DC motor rapidly
Braking.
When detecting that control circuit monitors that motor occurs power-up, detection control circuit controls the controlled of braking circuit of releasing
Switch K1 is opened, motor normal work.
By the explanation of specific embodiment, should to the present invention for reach technological means that predetermined purpose is taken and
Effect is able to more go deep into and specific understanding, but appended diagram is only to provide reference and purposes of discussion, not for originally
Invention is any limitation as.
Claims (10)
1. a kind of motor, it is characterised in that include：Release braking circuit and detect control circuit；
The braking circuit of releasing is connected in parallel between the positive pole and negative pole of motor feeder ear；
The detection control circuit is connected with the motor switch power supply and the braking circuit of releasing respectively；
The detection control circuit, for based on to the motor whether judged result of power-off, to the braking circuit of releasing
It is controlled；
The braking circuit of releasing, under the control of the detection control circuit, by the self induction electromotive force of the motor and
The energy of counter electromotive force is released.
2. motor according to claim 1, it is characterised in that the motor also includes：Isolation circuit；
The isolation circuit is connected between the positive pole of Switching Power Supply positive pole and motor feeder ear of motor；
The isolation circuit is in the motor power-off, carrying out insulation blocking to the motor switch power supply.
3. motor according to claim 2, it is characterised in that the isolation circuit is diode；
The positive pole of the diode connects the positive pole of the on and off switch power supply；
The negative pole of the diode connects the positive pole of the motor feeder ear.
4. motor according to claim 1, it is characterised in that the braking circuit of releasing includes bleeder resistance and controlled opens
Close；
The braking circuit of releasing is connected in parallel between the positive pole and negative pole of motor feeder ear；
The power detecting end of the detection control circuit is connected with the motor switch power supply, the control of the detection control circuit
Signal output part is connected with the controlled switch of the braking circuit of releasing.
5. motor according to claim 4, it is characterised in that the detection control circuit, specifically for：
If monitoring the motor generation power-off, the controlled switch of braking circuit of releasing described in control is closed, by the motor
Self induction electromotive force and the energy of counter electromotive force released；
If monitoring, the motor occurs to power up, and the controlled switch of braking circuit of releasing described in control is opened.
6. a kind of motor protection method, it is characterised in that methods described includes：
Release braking circuit and detection control circuit are set between motor switch power supply and motor；
Monitor whether the motor occurs power-off by detecting control circuit, braking circuit of if so, then releasing described in control is by institute
The energy for stating the self induction electromotive force and counter electromotive force of motor is released.
7. method according to claim 6, it is characterised in that methods described, also includes：
In the positive pole and releasing isolation circuit of arrange between braking circuit of motor switch power supply, the isolation circuit is for described
During motor power-off, insulation blocking is carried out to the motor switch power supply.
8. method according to claim 7, it is characterised in that the isolation circuit is diode；
The positive pole of the diode connects the positive pole of the Switching Power Supply；
The negative pole of the diode connects the positive pole of the motor feeder ear.
9. method according to claim 6, it is characterised in that the braking circuit of releasing includes bleeder resistance and controlled opens
Close；
The middle setting between motor switch power supply and motor is released braking circuit and detects control circuit, including：
The braking circuit of releasing is connected in parallel between the positive pole and negative pole of motor feeder ear；
The power detecting end of the detection control circuit is connected with the motor switch power supply, the control of the detection control circuit
Signal output part is connected with the controlled switch of the braking circuit of releasing.
10. method according to claim 9, it is characterised in that described by detecting that control circuit monitors the motor to be
No generation power-off, if so, then releases braking circuit by the energy of the self induction electromotive force and counter electromotive force of the motor described in control
Released, specifically included：
If by detecting that control circuit monitors that the motor occurs power-off, detecting braking electricity of releasing described in control circuit control
The controlled switch on road is closed, and the energy of the self induction electromotive force and counter electromotive force of the motor is released；
If by detecting that control circuit monitors that the motor occurs power-up, detecting braking electricity of releasing described in control circuit control
The controlled switch on road is opened.
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| CN201610928865.3A CN106549362A (en) | 2016-10-31 | 2016-10-31 | A kind of motor and motor protection method |
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| CN106997025A (en) * | 2017-05-23 | 2017-08-01 | 核工业理化工程研究院 | The measurement apparatus of counter electromotive force of motor |
| CN108412731A (en) * | 2018-02-09 | 2018-08-17 | 青岛海尔智能技术研发有限公司 | A kind of stroke evaluation method and device for Linearkompressor |
| CN109585234A (en) * | 2019-01-25 | 2019-04-05 | 无锡凯绎科技有限公司 | A kind of control circuit of frame-type circuit breaker electric motor operating mechanism |
| CN110236419A (en) * | 2018-03-07 | 2019-09-17 | 广东美的生活电器制造有限公司 | Food processor and its control system and power down display control method |
| CN111342439A (en) * | 2020-03-19 | 2020-06-26 | 浙江威星智能仪表股份有限公司 | Power supply voltage fluctuation improvement method based on motor driving circuit |
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| CN112713823A (en) * | 2020-12-18 | 2021-04-27 | 博奥生物集团有限公司 | Method and system for inhibiting back electromotive force interference of direct current motor on power supply system |
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| CN111342439A (en) * | 2020-03-19 | 2020-06-26 | 浙江威星智能仪表股份有限公司 | Power supply voltage fluctuation improvement method based on motor driving circuit |
| CN112713823A (en) * | 2020-12-18 | 2021-04-27 | 博奥生物集团有限公司 | Method and system for inhibiting back electromotive force interference of direct current motor on power supply system |
| CN112713823B (en) * | 2020-12-18 | 2022-08-02 | 博奥生物集团有限公司 | Method and system for inhibiting back electromotive force interference of direct current motor on power supply system |
| CN113479333A (en) * | 2021-08-16 | 2021-10-08 | 清航空天(北京)科技有限公司 | Miniature turbojet engine control system |
| CN113479333B (en) * | 2021-08-16 | 2022-03-04 | 清航空天(北京)科技有限公司 | Miniature turbojet engine control system |
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Inventor after: Guan Hongxing Inventor after: Yan Tingxin Inventor after: Wei Tiecheng Inventor after: Song Yanfeng Inventor before: Guan Hongxing |
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