CN104143938A - Control equipment and method for three-phase BLDC motor - Google Patents
Control equipment and method for three-phase BLDC motor Download PDFInfo
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- CN104143938A CN104143938A CN201310168206.0A CN201310168206A CN104143938A CN 104143938 A CN104143938 A CN 104143938A CN 201310168206 A CN201310168206 A CN 201310168206A CN 104143938 A CN104143938 A CN 104143938A
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Abstract
The invention provides control equipment and method for a three-phase BLDC motor. A motor body comprises a stator and a rotor, and the stator is formed by three-phase (A-B-C) windings in a star connection mode. The control equipment comprises a rotor position detection device, a control device, a drive device, a phase-changing circuit device and a voltage detection device, wherein a three-phase bridge circuit is adopted for the phase-changing circuit device, and the phase-changing circuit device is composed of three half-bridges formed by connecting six power logic switching units in pairs; a voltage detection signal output by the voltage detection device expresses that when a certain power logic switching unit in the phase-changing circuit device fails, the control device outputs a control signal in a failure state, so that the output of the half-bridge where the failed power logic switching unit is located in the phase-changing circuit device is shut off, and the power logic switching units in the other two half-bridges are fed through or shut off to control the on-off sequence and time of the windings of all phases on the stator of the motor body connected with the power logic switching units.
Description
Technical field
The present invention relates to control appliance and the control method of a kind of three-phase direct-current brushless (BLDC) motor, more specifically, during relating to a kind of power transistor in commutation circuit device and breaking down, can keep control appliance and the control method of three-phase direct-current brushless (BLDC) motor that motor works on.
Background technology
Brushless direct-current (BLDC) motor utilizes electronics phase changer to replace mechanical brush and mechanical phase changer, make this motor not only retain the advantage of DC motor, and there is again the advantage such as simple in structure, reliable, easy to maintenance of alternating current motor.Brushless direct-current (BLDC) motor can be configured to single-phase, two-phase and three-phase.The quantity of stator winding is corresponding with its type.Wherein three phase electric machine is most popular, uses the most general.
In various types of electric motor cars (including but not limited to electric bicycle and Segway Human Transporter etc.) of producing at present, conventionally adopt three-phase direct-current brushless (BLDC) motor as drive unit.Fig. 1 shows the control appliance of three-phase direct-current brushless (BLDC) motor in the electric motor car of prior art, wherein motor body 1 includes stator and rotor, stator is made up of the Y-connection of 3 phases (A-B-C) coil windings, described control appliance comprises: the position detecting device 2 being connected with described motor body 1, for detection of the rotor-position in motor body 1, output rotor position signalling; The controller 3 being connected with described position detecting device 2, decodes for the rotor-position signal that described position detecting device 2 is exported, to export corresponding control signal; The drive unit 4 being connected with described control device 3, for the control signal of exporting according to described control device 3, the corresponding signal that drives of output; The commutation circuit device 5 being connected with described stator with described drive unit 4 respectively, for the driving signal of exporting according to described drive unit 4, make the conducting of each logical power switch element or shutoff in described commutation circuit device 5, to control in coupled described motor body 1 order and the time of each phase winding break-make on stator, wherein, described commutation circuit device 5 adopts three-phase bridge circuit, by 6 logical power switch element Q
0-Q
53 half-bridges that connect between two combine, and the output of each half-bridge is connected with corresponding each phase coil winding in described motor stator respectively; And voltage check device 6, be connected between the output of described commutation circuit device 5 and the input of described control device 3, for detection of each described logical power switch element Q in described commutation circuit device 5
0-Q
5operating state, voltage sense signal is given described control device 3, wherein said control device 3 is in the time receiving voltage detection signal that described voltage check device 6 exports and represent that a certain logical power switch element in described commutation circuit device breaks down, described control device 3 stops the work of described control appliance, thereby stops the work of three-phase direct-current brushless (BLDC) motor.
Wherein, described control device 3 adopts 120 degree square waves or the sinusoidal wave control mode of 180 degree, makes the logical power switch element Q on each half-bridge in the three-phase bridge circuit of described commutation circuit device 5
0-Q
5oN time be one electricity the cycle 1/3.
Wherein, described logical power switch element Q
0-Q
5conventionally adopt power transistor.
Wherein, described position probing apparatus adopts three Hall elements or shaft-position encoder or back-emf sensing circuit conventionally.
Wherein, described control device 3 adopts single-chip microcomputer or DSP conventionally.
Fig. 2 shows the control method of three-phase direct-current brushless (BLDC) motor of prior art, includes following steps:
(S1-S2) detect the rotor-position in motor body, output rotor position signalling by a position detecting device;
(S3) by a voltage check device, the operating state of the each logical power switch element in one commutation circuit device is detected, voltage sense signal, wherein said commutation circuit device adopts three-phase bridge circuit, 3 half-bridges that connected between two by 6 described logical power switch elements form, and the output of each half-bridge is connected with corresponding each phase coil winding in described motor stator respectively;
(S4) if described voltage detection signal represents that the operating state of the each logical power switch element in described commutation circuit device is normal, a control device is decoded to the rotor-position signal of described position detecting device output, to export the control signal under corresponding normal condition;
(S5) if representing the operating state of a certain logical power switch element in described commutation circuit device, described voltage detection signal breaks down, described control device sends out-of-work instruction, thereby stops the work of three-phase direct-current brushless (BLDC) motor;
(S6) receive the control signal under the normal condition of described control device output, the corresponding signal that drives of output by a drive unit; And
(S7-S8) receive by described commutation circuit device the driving signal that described drive unit is exported, make the conducting of each logical power switch element or shutoff in described commutation circuit device, to control in coupled described motor body order and the time of each phase winding break-make on stator.
Wherein, described control device adopts 120 degree square waves or the sinusoidal wave control mode of 180 degree, and making the ON time of the logical power switch element on each half-bridge in the three-phase bridge circuit of described commutation circuit device is 1/3 of an electricity cycle.
In the use of electric motor car, because motor damages, power tube itself of poor quality or select rank deficient, device is installed or vibration is become flexible, motor overload, the unreasonable many reasons that waits of power device parameter designing can cause that the logical power switch element in commutation circuit device breaks down, as mentioned above, once a certain logical power switch element in commutation circuit device breaks down, control device will stop the work of three-phase direct-current brushless (BLDC) motor, make the user of the electric motor car go-cart of requiring great effort of having to, shoulder car and even call out rescue, to this, bring very large inconvenience to the user of electric motor car.
Summary of the invention
For this reason, the object of the present invention is to provide control appliance and the control method of a kind of three-phase direct-current brushless (BLDC) motor, when it can a certain logical power switch element in commutation circuit device breaks down, still make described motor continue maintenance work.
According to an aspect of the present invention, the control method of a kind of three-phase direct-current brushless (BLDC) motor is provided, wherein motor body includes stator and rotor, and stator is made up of the Y-connection of 3 phases (A-B-C) coil windings, and described method includes following steps:
(S1-S2) detect the rotor-position in motor body, output rotor position signalling by a position detecting device;
(S3) by a voltage check device, the operating state of the each logical power switch element in one commutation circuit device is detected, voltage sense signal, wherein said commutation circuit device adopts three-phase bridge circuit, 3 half-bridges that connected between two by 6 described logical power switch elements form, and the output of each half-bridge is connected with corresponding each phase coil winding in described motor stator respectively;
(S4) if described voltage detection signal represents that the operating state of the each logical power switch element in described commutation circuit device is normal, a control device is decoded to the rotor-position signal of described position detecting device output, to export the control signal under corresponding normal condition;
(S5) if described voltage detection signal represents the operating state of a certain logical power switch element in described commutation circuit device to break down, the control signal under described control device output malfunction;
(S6) receive control signal under the normal condition of described control device output or the control signal under malfunction, the corresponding signal that drives of output by a drive unit; And
(S7-S8) receive by described commutation circuit device the driving signal that described drive unit is exported, make the conducting of each logical power switch element or shutoff in described commutation circuit device, to control in coupled described motor body order and the time of each phase winding break-make on stator
Wherein in the time that described control device is exported the control signal under malfunction, the output of the half-bridge at the logical power switch element place of breaking down in described commutation circuit device is turned off, thereby the normal logical power switch element of operating state in another two half-bridges in described commutation circuit device except the half-bridge that described output is turned off is switched on or turn-offs, to control in coupled described motor body order and the time of each phase winding break-make on stator.
In one embodiment, in described commutation circuit device in the normal situation of operating state of each logical power switch element, 120 degree square wave control signals under described control device output normal condition, control the corresponding signal that drives of driver output, make the conducting of each logical power switch element or shutoff in described commutation circuit device, logical power switch element ON time on each half-bridge is 1/3 of an electricity cycle, thereby switch on commutation to control in coupled motor body the order of each phase winding break-make and time on stator with the order of AB-AC-BC-BA-CA-CB-AB.
In one embodiment, a certain logical power switch element in described commutation circuit device breaks down, control signal under described control device output malfunction, control the corresponding signal that drives of driver output, make in described commutation circuit device except described in operating state normal logical power switch element conducting or shutoff in another two half-bridges the half-bridge at the logical power switch element place of breaking down, thereby in situation about breaking down with a certain logical power switch element in half-bridge that in motor stator, C phase winding is connected with AB-BA(), or in AC-CA(situation about breaking down with a certain logical power switch element in half-bridge that in motor stator, B phase winding is connected), or in BC-CB(situation about breaking down with a certain logical power switch element in half-bridge that in motor stator, A phase winding is connected) order switch on commutation to control in coupled motor body the order of corresponding windings break-make and time on stator.
In one embodiment, a certain logical power switch element in described commutation circuit device breaks down, 180 degree square wave control signals under described control device output malfunction, control the corresponding signal that drives of driver output, make in described commutation circuit device except described in the ON time of the normal logical power switch element of operating state on each half-bridge in another two half-bridges the half-bridge at the logical power switch element place of breaking down be 1/2 of an electricity cycle, thereby vibration and noise that described three-phase direct-current brushless (BLDC) motor produces in the time of phase-deficient operation are greatly weakened.
According to a further aspect in the invention, provide the control appliance of a kind of three-phase direct-current brushless (BLDC) motor, wherein motor body includes stator and rotor, and stator is made up of the Y-connection of 3 phases (A-B-C) coil windings, and described control appliance comprises:
The position detecting device being connected with described motor body, for detection of the rotor-position in motor body, output rotor position signalling;
The control device being connected with described position detecting device, for the rotor-position signal of described position detecting device output is decoded, exports corresponding control signal;
The drive unit being connected with described control device, for according to the control signal of described control device output, exports the corresponding signal that drives;
The commutation circuit device being connected with described stator with described drive unit respectively, for the driving signal of exporting according to described drive unit, make the conducting of each logical power switch element or shutoff in described commutation circuit device, to control in coupled described motor body order and the time of each phase winding break-make on stator, wherein, described commutation circuit device adopts three-phase bridge circuit, 3 half-bridges that connected between two by 6 logical power switch elements form, and the output of each half-bridge is connected with corresponding each phase coil winding in described motor stator respectively; And
Voltage check device, be connected between the output of described commutation circuit device and the input of described control device, for detection of the operating state of each described logical power switch element in described commutation circuit device, voltage sense signal is given described control device
Wherein said control device is in the time that the voltage detection signal that receives the output of described voltage check device represents that a certain logical power switch element in described commutation circuit device breaks down, the control signal under described control device output malfunction, the output of the half-bridge at the logical power switch element place of breaking down in described commutation circuit device is turned off, thereby the normal logical power switch element of operating state in another two half-bridges in described commutation circuit device except the half-bridge that described output is turned off is switched on or turn-offs, to control in coupled described motor body order and the time of each phase winding break-make on stator.
In one embodiment, described logical power switch element is power transistor.
In one embodiment, described position detecting device adopts three Hall elements or shaft-position encoder or back-emf sensing circuit.
In one embodiment, described control device adopts single-chip microcomputer or DSP.
In one embodiment, a certain logical power switch element in described commutation circuit device breaks down, control signal under described control device output malfunction, control the corresponding signal that drives of driver output, make in described commutation circuit device except described in operating state normal logical power switch element conducting or shutoff in another two half-bridges the half-bridge at the logical power switch element place of breaking down, thereby in situation about breaking down with a certain logical power switch element in half-bridge that in motor stator, C phase winding is connected with AB-BA(), or in AC-CA(situation about breaking down with a certain logical power switch element in half-bridge that in motor stator, B phase winding is connected), or in BC-CB(situation about breaking down with a certain logical power switch element in half-bridge that in motor stator, A phase winding is connected) order switch on commutation to control in coupled motor body the order of corresponding windings break-make and time on stator.
In one embodiment, a certain logical power switch element in described commutation circuit device breaks down, 180 degree square wave control signals under described control device output malfunction, control the corresponding signal that drives of driver output, make in described commutation circuit device except described in the ON time of the normal logical power switch element of operating state on each half-bridge in another two half-bridges the half-bridge at the logical power switch element place of breaking down be 1/2 of an electricity cycle, thereby vibration and noise that described three-phase direct-current brushless (BLDC) motor produces in the time of phase-deficient operation are greatly weakened.
In electric motor car, use by control appliance and the control method of three-phase direct-current brushless provided by the invention (BLDC) motor, when a certain logical power switch element in can the commutation circuit device in electric motor car breaks down, described control device makes described three-phase direct-current brushless (BLDC) motor can work on to drive electric motor car, even call out the problem of rescue thereby the user charge of avoiding occurring electric motor car tries hard to recommend car, shoulder car, bring great convenience to the user of electric motor car.
Brief description of the drawings
According to the following description to embodiment by reference to the accompanying drawings, above-mentioned and/or other aspects of the present invention and advantage will become apparent and be easier to understanding, in accompanying drawing:
Fig. 1 shows the block diagram of the control appliance of three-phase direct-current brushless (BLDC) motor of prior art;
Fig. 2 shows the flow chart of the control method of three-phase direct-current brushless (BLDC) motor of prior art;
Fig. 3 shows according to the block diagram of the control appliance of three-phase direct-current brushless of the present invention (BLDC) motor;
Fig. 4 shows according to the flow chart of the control method of three-phase direct-current brushless of the present invention (BLDC) motor.
Embodiment
To describe embodiments of the invention below in detail, and illustrate example of the present invention in accompanying drawing, label similar in accompanying drawing represents similar element all the time.
Fig. 3 shows according to the block diagram of the control appliance of three-phase direct-current brushless of the present invention (BLDC) motor, wherein motor body 1 includes stator and rotor, stator is made up of the Y-connection of 3 phases (A-B-C) winding, comprises according to the control appliance of three-phase direct-current brushless of the present invention (BLDC) motor:
The position detecting device 2 being connected with described motor body 1, for detection of the rotor-position in motor body 1, output rotor position signalling;
The control device 3 being connected with described position detecting device 2, decodes for the rotor-position signal that described position detecting device 2 is exported, and exports corresponding control signal;
The drive unit 4 being connected with described control device 3, for the control signal of exporting according to described control device 3, the corresponding signal that drives of output;
The commutation circuit device 5 being connected with described stator with described drive unit 4 respectively, for the driving signal of exporting according to described drive unit 4, makes the each logical power switch element Q in described commutation circuit device 5
0-Q
5conducting or shutoff, to control in coupled described motor body 1 order and the time of each phase winding break-make on stator, wherein, described commutation circuit device 5 adopts three-phase bridge circuit, by 6 logical power switch element Q
0-Q
53 half-bridge compositions that connect between two, each half-bridge (Q
0-Q
1, Q
2-Q
3, Q
4-Q
5) output respectively with described motor stator in corresponding each phase (A phase, B phase, C phase) coil windings be connected; And
Voltage check device 6, is connected between the output of described commutation circuit device 5 and the input of described control device 3, for detection of each described logical power switch element Q in described commutation circuit device 5
0-Q
5operating state, voltage sense signal give described control device 3,
Wherein said control device 3 is in the time receiving voltage detection signal that described voltage check device 6 exports and represent that a certain logical power switch element in described commutation circuit device 5 breaks down, described control device 3 is exported the control signal under malfunction, the output of the half-bridge at the logical power switch element place of breaking down in described commutation circuit device 5 is turned off, thereby the normal logical power switch element of operating state in another two half-bridges in described commutation circuit device 6 except the half-bridge that described output is turned off is switched on or turn-offs, to control in coupled described motor body 1 order and the time of each phase winding break-make on stator.
Wherein, described logical power switch element Q
0-Q
5adopt power transistor; Described position detecting device 2 adopts three Hall elements (certainly also can adopt shaft-position encoder or back-emf sensing circuit); Described control device 3 adopts single-chip microcomputer (certainly also can adopt DSP).
Each described logical power switch element Q in described commutation circuit device 5
0-Q
5in the normal situation of operating state, described control device 3 is exported 120 under normal condition degree square wave or the sinusoidal wave control signal of 180 degree, and making the ON time of the logical power switch element on each half-bridge in the three-phase bridge circuit of described commutation circuit device 5 is 1/3 of an electricity cycle.
A certain logical power switch element in described commutation circuit device 5 breaks down, described control device 3 is exported the degree of 180 under malfunction square wave control signal, make in described commutation circuit device 5 except described in the ON time of the normal logical power switch element of operating state on each half-bridge in another two half-bridges the half-bridge at the logical power switch element place of breaking down be 1/2 of an electricity cycle, thereby greatly weakened vibration and the noise that described three-phase direct-current brushless (BLDC) motor produces in the time of phase-deficient operation.
Wherein, the logical power switch element Q in described commutation circuit device 5
0or Q
1in situation about breaking down, described control device 3 is exported 180 under malfunction degree square wave control signal, controls the corresponding signal that drives of driver 4 outputs, makes the logical power switch element Q breaking down described in removing in described commutation circuit device 5
0or Q
1half-bridge (the Q at place
0-Q
1) the normal logical power switch element of operating state (Q in another two half-bridges in addition
2-Q
3and Q
4-Q
5) conducting or shutoff, the logical power switch element (Q on each half-bridge
2-Q
3or Q
4-Q
5) ON time be one electricity the cycle 1/2, thereby with BC-CB(logical power switch element Q
0or Q
1the half-bridge at place is connected with A phase winding in motor stator) order switch on commutation to control in coupled motor body the order of corresponding windings break-make and time on stator.
Similarly, the logical power switch element Q in described commutation circuit device 5
2or Q
3in situation about breaking down, described control device 3 is exported 180 under malfunction degree square wave control signal, controls the corresponding signal that drives of driver 4 outputs, makes the logical power switch element Q breaking down described in removing in described commutation circuit device 5
2or Q
3half-bridge (the Q at place
2-Q
3) the normal logical power switch element of operating state (Q in another two half-bridges in addition
0-Q
1and Q
4-Q
5) conducting or shutoff, the logical power switch element (Q on each half-bridge
0-Q
1or Q
4-Q
5) ON time be one electricity the cycle 1/2, thereby with AC-CA(logical power switch element Q
2or Q
3the half-bridge at place is connected with B phase winding in motor stator) order switch on commutation to control in coupled motor body the order of corresponding windings break-make and time on stator.
Similarly, the logical power switch element Q in described commutation circuit device 5
4or Q
5in situation about breaking down, described control device 3 is exported 180 under malfunction degree square wave control signal, controls the corresponding signal that drives of driver 4 outputs, makes the logical power switch element Q breaking down described in removing in described commutation circuit device 5
4or Q
5half-bridge (the Q at place
4-Q
5) the normal logical power switch element of operating state (Q in another two half-bridges in addition
0-Q
1and Q
2-Q
3) conducting or shutoff, thereby with AB-BA(logical power switch element Q
4or Q
5the half-bridge at place is connected with C phase winding in motor stator) order switch on commutation to control in coupled motor body the order of corresponding windings break-make and time on stator.
Fig. 4 shows according to the flow chart of the control method of three-phase direct-current brushless of the present invention (BLDC) motor, wherein motor body 1 includes stator and rotor, stator is made up of the Y-connection of 3 phases (A-B-C) coil windings, according to the control method of three-phase direct-current brushless of the present invention (BLDC) motor, include following steps:
(S1-S2) detect the rotor-position in motor body 1 by a position detecting device 2, output rotor position signalling, described position detecting device 2 adopts three Hall elements (certainly also can adopt shaft-position encoder or back-emf sensing circuit);
(S3) by a voltage check device 6 to the each logical power switch element Q in a commutation circuit device 5
0-Q
5operating state detect, voltage sense signal, wherein said commutation circuit device 5 adopts three-phase bridge circuit, by 6 described logical power switch element Q
0-Q
5connect between two 3 half-bridge compositions, each half-bridge (Q
0-Q
1, Q
2-Q
3, Q
4-Q
5) output respectively with described motor stator in corresponding each phase (A phase, B phase, C phase) coil windings be connected, each described logical power switch element Q
0-Q
5adopt power transistor;
(S4) if described voltage detection signal represents the each logical power switch element Q in described commutation circuit device 5
0-Q
5operating state normal, the rotor-position signal that a control device 3 is exported described position detecting device 2 is decoded, to export the control signal under corresponding normal condition, described control device 3 adopts single-chip microcomputer (certainly also can adopt DSP);
(S5) if described voltage detection signal represents a certain logical power switch element Q in described commutation circuit device 5
0-Q
5operating state break down, described control device 3 is exported the control signal under malfunction;
(S6) receive control signal under the normal condition that described control device 3 exports or the control signal under malfunction, the corresponding signal that drives of output by a drive unit 4; And
(S7-S8) receive by described commutation circuit device 5 the driving signal that described drive unit 4 is exported, make the each logical power switch element Q in described commutation circuit device 5
0-Q
5conducting or shutoff, to control in coupled described motor body 1 order and the time of each phase winding break-make on stator,
Wherein in the time that described control device 3 is exported the control signal under malfunction, the output of the half-bridge at the logical power switch element place of breaking down in described commutation circuit device 5 is turned off, thereby the normal logical power switch element of operating state in another two half-bridges in described commutation circuit device 5 except the half-bridge that described output is turned off is switched on or turn-offs, to control in coupled described motor body 1 order and the time of each phase winding break-make on stator.
Wherein, each logical power switch element Q in described commutation circuit device 5
0-Q
5the normal situation of operating state under, described control device 3 is exported 120 under normal condition degree square wave control signal, the corresponding signal that drives of accessory drive 4 outputs, makes the each logical power switch element Q in described commutation circuit device 5
0-Q
5conducting or shutoff, the ON time of the logical power switch element on each half-bridge is 1/3 of an electricity cycle, thereby switches on commutation to control in coupled motor body 1 order of each phase winding break-make and time on stator with the order of AB-AC-BC-BA-CA-CB-AB.
Wherein, the logical power switch element Q in described commutation circuit device 5
0or Q
1in situation about breaking down, described control device 3 is exported 180 under malfunction degree square wave control signal, controls the corresponding signal that drives of driver 4 outputs, makes the logical power switch element Q breaking down described in removing in described commutation circuit device 5
0or Q
1half-bridge (the Q at place
0-Q
1) the normal logical power switch element of operating state (Q in another two half-bridges in addition
2-Q
3and Q
4-Q
5) conducting or shutoff, the logical power switch element (Q on each half-bridge
2-Q
3or Q
4-Q
5) ON time be one electricity the cycle 1/2, thereby with BC-CB(logical power switch element Q
0or Q
1the half-bridge at place is connected with A phase winding in motor stator) order switch on commutation to control in coupled motor body the order of corresponding windings break-make and time on stator.
Similarly, the logical power switch element Q in described commutation circuit device 5
2or Q
3in situation about breaking down, described control device 3 is exported 180 under malfunction degree square wave control signal, controls the corresponding signal that drives of driver 4 outputs, makes the logical power switch element Q breaking down described in removing in described commutation circuit device 5
2or Q
3half-bridge (the Q at place
2-Q
3) the normal logical power switch element of operating state (Q in another two half-bridges in addition
0-Q
1and Q
4-Q
5) conducting or shutoff, the logical power switch element (Q on each half-bridge
0-Q
1or Q
4-Q
5) ON time be one electricity the cycle 1/2, thereby with AC-CA(logical power switch element Q
2or Q
3the half-bridge at place is connected with B phase winding in motor stator) order switch on commutation to control in coupled motor body the order of corresponding windings break-make and time on stator.
Logical power switch element Q in described commutation circuit device 5
4or Q
5in situation about breaking down, described control device 3 is exported 180 under malfunction degree square wave control signal, controls the corresponding signal that drives of driver 4 outputs, makes the logical power switch element Q breaking down described in removing in described commutation circuit device 5
4or Q
5half-bridge (the Q at place
4-Q
5) the normal logical power switch element of operating state (Q in another two half-bridges in addition
0-Q
1and Q
2-Q
3) conducting or shutoff, the logical power switch element (Q on each half-bridge
0-Q
1or Q
2-Q
3) ON time be one electricity the cycle 1/2, thereby with AB-BA(logical power switch element Q
4or Q
5the half-bridge at place is connected with C phase winding in motor stator) order switch on commutation to control in coupled motor body the order of corresponding windings break-make and time on stator.
In sum, the invention provides control appliance and the control method of a kind of three-phase direct-current brushless (BLDC) motor, when a certain logical power switch element in can the commutation circuit device in electric motor car is damaged, described control appliance and control method make described three-phase direct-current brushless (BLDC) motor can work on to drive electric motor car, even call out the problem of rescue thereby the user charge of avoiding occurring electric motor car tries hard to recommend car, shoulder car, bring great convenience to the user of electric motor car.
The foregoing is only the preferred embodiments of the present invention, all equivalence replacement or modification of doing according to the present invention, all should belong to protection scope of the present invention.
Claims (10)
1. a control method for three-phase direct-current brushless (BLDC) motor, wherein motor body includes stator and rotor, and stator is made up of the Y-connection of 3 phases (A-B-C) coil windings, and described method includes following steps:
(S1-S2) detect the rotor-position in motor body, output rotor position signalling by a position detecting device;
(S3) by a voltage check device, the operating state of the each logical power switch element in one commutation circuit device is detected, voltage sense signal, wherein said commutation circuit device adopts three-phase bridge circuit, 3 half-bridges that connected between two by 6 described logical power switch elements form, and the output of each described half-bridge is connected with corresponding each phase coil winding in described motor stator respectively;
(S4) if described voltage detection signal represents that the operating state of the each logical power switch element in described commutation circuit device is normal, a control device is decoded to the rotor-position signal of described position detecting device output, to export the control signal under corresponding normal condition;
(S5) if described voltage detection signal represents the operating state of a certain logical power switch element in described commutation circuit device to break down, the control signal under described control device output malfunction;
(S6) receive control signal under the normal condition of described control device output or the control signal under malfunction, the corresponding signal that drives of output by a drive unit; And
(S7-S8) receive by described commutation circuit device the driving signal that described drive unit is exported, make the conducting of each logical power switch element or shutoff in described commutation circuit device, to control in coupled described motor body order and the time of each phase winding on/off on stator
Wherein in the time that described control device is exported the control signal under malfunction, the output of the half-bridge at the logical power switch element place of breaking down in described commutation circuit device is turned off, thereby the normal logical power switch element of operating state in another two half-bridges in described commutation circuit device except the half-bridge that described output is turned off is switched on or turn-offs, to control in coupled described motor body order and the time of each phase winding break-make on stator.
2. method according to claim 1, wherein in step (S4), in described commutation circuit device in the normal situation of operating state of each logical power switch element, 120 degree square wave control signals under described control device output normal condition, control the corresponding signal that drives of described driver output, make the conducting of each logical power switch element or shutoff in described commutation circuit device, logical power switch element ON time on each half-bridge is 1/3 of an electricity cycle, thereby switch on commutation to control in coupled motor body the order of each phase winding on/off and time on stator with the order of AB-AC-BC-BA-CA-CB-AB.
3. method according to claim 1, wherein in step (S5), a certain logical power switch element in described commutation circuit device and in half-bridge that in motor stator, C phase winding is connected breaks down, control signal under described control device output malfunction, control the corresponding signal that drives of described driver output, make to be turned off with the output of the half-bridge that in motor stator, C phase winding is connected in described commutation circuit device, operating state normal logical power switch element conducting or shutoff in two half-bridges that are connected with A phase in motor stator and B phase winding, thereby switch on commutation to control in coupled motor body the order of corresponding windings on/off and time on stator with the order of AB-BA.
4. according to the method described in claim 1 or 3, wherein in step (S5), breaking down with a certain logical power switch element in half-bridge that in motor stator, C phase winding is connected in described commutation circuit device, 180 degree square wave control signals under described control device output malfunction, control the corresponding signal that drives of described driver output, make to be turned off with the output of the half-bridge that in motor stator, C phase winding is connected in described commutation circuit device, the normal logical power switch element of operating state ON time in two half-bridges that are connected with A phase in motor stator and B phase winding is 1/2 of an electricity cycle.
5. a control appliance for three-phase direct-current brushless (BLDC) motor, wherein motor body includes stator and rotor, and stator is made up of the Y-connection of 3 phases (A-B-C) winding, and described control appliance comprises:
The position detecting device being connected with described motor body, for detection of the rotor-position in motor body, output rotor position signalling;
The control device being connected with described position detecting device, for the rotor-position signal of described position detecting device output is decoded, exports corresponding control signal;
The drive unit being connected with described control device, for according to the control signal of described control device output, exports the corresponding signal that drives;
The commutation circuit device being connected with described stator with described drive unit respectively, for the driving signal of exporting according to described drive unit, make the conducting of each logical power switch element or shutoff in described commutation circuit device, to control in coupled described motor body order and the time of each phase winding break-make on stator, wherein, described commutation circuit device adopts three-phase bridge circuit, 3 half-bridges that connected between two by 6 logical power switch elements form, and the output of each described half-bridge is connected with corresponding each phase coil winding in described motor stator respectively; And
Voltage check device, be connected between the output of described commutation circuit device and the input of described control device, for detection of the operating state of each described logical power switch element in described commutation circuit device, voltage sense signal is given described control device
Wherein said control device is in the time that the voltage detection signal that receives the output of described voltage check device represents that a certain logical power switch element in described commutation circuit device breaks down, the control signal under described control device output malfunction, the output of the half-bridge at the logical power switch element place of breaking down in described commutation circuit device is turned off, thereby the normal logical power switch element of operating state in another two half-bridges in described commutation circuit device except the half-bridge that described output is turned off is switched on or turn-offs, to control in coupled described motor body order and the time of each phase winding break-make on stator.
6. control appliance according to claim 5, wherein said logical power switch element is power transistor.
7. control appliance according to claim 5, wherein said position detecting device adopts three Hall elements or shaft-position encoder or back-emf sensing circuit.
8. control appliance according to claim 5, wherein said control device adopts single-chip microcomputer or DSP.
9. control appliance according to claim 5, wherein, a certain logical power switch element in described commutation circuit device and in half-bridge that in motor stator, C phase winding is connected breaks down, control signal under described control device output malfunction, control the corresponding signal that drives of driver output, make to be turned off with the output of the half-bridge that in motor stator, C phase winding is connected in described commutation circuit device, operating state normal logical power switch element conducting or shutoff in two half-bridges that are connected with A phase in motor stator and B phase winding, thereby switch on commutation to control in coupled motor body the order of corresponding windings break-make and time on stator with the order of AB-BA.
10. according to the control appliance described in claim 5 or 9, wherein a certain logical power switch element in described commutation circuit device and in half-bridge that in motor stator, C phase winding is connected breaks down, 180 degree square wave control signals under described control device output malfunction, control the corresponding signal that drives of driver output, make to be turned off with the output of the half-bridge that in motor stator, C phase winding is connected in described commutation circuit device, the normal logical power switch element of operating state ON time on each half-bridge in two half-bridges that are connected with A phase in motor stator and B phase winding is 1/2 of an electricity cycle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310168206.0A CN104143938A (en) | 2013-05-06 | 2013-05-06 | Control equipment and method for three-phase BLDC motor |
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| CN201310168206.0A CN104143938A (en) | 2013-05-06 | 2013-05-06 | Control equipment and method for three-phase BLDC motor |
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| CN104143938A true CN104143938A (en) | 2014-11-12 |
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| CN114447885A (en) * | 2020-10-30 | 2022-05-06 | 茂达电子股份有限公司 | Three-phase motor driving circuit and method |
| CN114732300A (en) * | 2022-04-29 | 2022-07-12 | 深圳朗特智能控制股份有限公司 | Food processing equipment and food processing method thereof |
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Application publication date: 20141112 |