CN104111420A - Phase-loss detection method of direct-current motor system and direct-current motor system - Google Patents

Abstract

The invention discloses a phase-loss detection method of a direct-current motor system. The direct-current motor system comprises N direct-current motors in parallel connection, an IPM module respectively connected to the N direct-current motors, and a master control module, wherein the master control module outputs six paths of PWM signals to the IPM module to control the N direct-current motors; and the N is larger than or equal to 2. The detection method comprises the following steps that: a first direct current Id1 is applied to straight shafts of the N direct-current motors; a maximum straight shaft voltage Vdmax and a minimum straight shaft voltage Vdmin of the N direct-current motors are obtained; when the ratio of the maximum straight shaft voltage Vdmax to the minimum straight shaft voltage Vdmin is larger than a preset threshold, the occurrence of the motor phase-loss situation at the N direct-current motors in the direct-current motor system is determined. According to the invention, the occurrence of the motor phase-loss situation at the N direct-current motors can be detected, thereby ensuring the normal operation of the direct-current motor system, guaranteeing the system performance, realizing reliable control of the system and avoiding potential safety hazard. In addition, the invention also discloses a direct-current motor system.

Description

The method for detecting open phase of direct current motor system and direct current motor system

Technical field

The present invention relates to technical field of motors, particularly a kind of method for detecting open phase of direct current motor system and a kind of direct current motor system.

Background technology

It is more energy-conservation, efficient that direct current generator is compared alternating current generator, and along with advocating that national energy-saving reduces discharging, more and more air-conditioning producer utilizes direct current generator development and Design air conditioner.Existing direct current motor system mostly adopts 1 IPM module of 1 master control module controls (Intelligent Power Module, Intelligent Power Module), then by 1 direct current generator of IPM module drive.But the shortcoming that prior art exists is that direct current generator cost than alternating current generator cost summary height a bit, correspondingly, compare AC motor system and want complicated, more expensive by direct current motor system.Particularly all dependence on import of IPM module major part, domestic little manufacturer production, thus cause the cost of IPM module high.For example, for two through-flow cabinet indoor units and two outdoor type of wind wheel of 2 direct current generators of needs, just need 2 IPM to drive 2 direct current generators, thereby make the cost of two through-flow cabinet indoor units and two outdoor types of wind wheel higher.Thus, the sky high cost of direct current motor system becomes the universal most important obstacle of obstruction direct current generator.

In correlation technique, propose a kind of direct current motor system, as shown in Figure 1, can adopt 1 main control module 30 ' to control 1 IPM module 20 ' and drive 1 direct current generator 1 '; As shown in Figure 2, also adopt 1 main control module 30 ' to control 2 direct current generators of 2 IPM module drive, IPM module 20 ' drives direct current generator 1 ' and IPM module 21 ' to drive direct current generator 2 '; As shown in Figure 3, also can adopt 1 main control module 30 ' to control 3 motors of 3 IPM module drive, IPM module 20 ' drives direct current generator 1 ', IPM module 21 ' to drive direct current generator 2 ' and IPM module 22 ' to drive direct current generator 3 '.And, because the main control module in correlation technique is up to the control interface of 3 IPM modules, just need to increase main control module if need to control more direct current generators.

To sum up, there are improved needs in the direct current motor system of correlation technique.

Summary of the invention

Object of the present invention is intended to solve at least to a certain extent above-mentioned technological deficiency.

For this reason, one object of the present invention is to propose a kind of method for detecting open phase that can accurately detect N direct current generator and whether exist the direct current motor system of motor phase failure situation.

Another object of the present invention is to propose a kind of direct current motor system.

For achieving the above object, the method for detecting open phase of a kind of direct current motor system that one aspect of the present invention embodiment proposes, described direct current motor system comprises N direct current generator in parallel, is connected respectively to IPM module and the extremely main control module of described IPM module so that a described N direct current generator is controlled of output six road pwm signals of a described N direct current generator, N is more than or equal to 2 integer, and described method for detecting open phase comprises the following steps: the d-axis to a described N direct current generator applies DC current I _d; Obtain the maximum direct-axis voltage V of a described N direct current generator _dmaxwith minimum direct-axis voltage V _dmin; As described maximum direct-axis voltage V _dmaxwith described minimum direct-axis voltage V _dminratio while being greater than predetermined threshold value, judge that described N direct current generator in described direct current motor system exists motor phase failure situation.

The method for detecting open phase of the direct current motor system proposing according to the embodiment of the present invention, first applies DC current I to the d-axis of N direct current generator _d, then obtain the maximum direct-axis voltage V of N direct current generator _dmaxwith minimum direct-axis voltage V _dmin, as maximum direct-axis voltage V _dmaxwith minimum direct-axis voltage V _dminratio while being greater than predetermined threshold value, judge that N direct current generator in direct current motor system exists motor phase failure situation.Thus, in the direct current motor system that adopts 1 IPM module to control N direct current generator, this method for detecting open phase can detect N direct current generator and whether have motor phase failure situation, thereby guarantee the normal operation of direct current motor system, ensure system performance, realize the reliable control of direct current motor system, avoid potential safety hazard.

In one embodiment of the invention, obtain the maximum direct-axis voltage V of a described N direct current generator _dmaxwith minimum direct-axis voltage V _dmin, specifically comprise: control a described N direct current generator to preset the operation of electric angle speed; In Preset Time, detect in real time the direct-axis voltage V of a described N direct current generator _dto obtain the maximum direct-axis voltage V of a described N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.

In another embodiment of the present invention, obtain the maximum direct-axis voltage V of a described N direct current generator _dmaxwith minimum direct-axis voltage V _dmin, specifically comprise: control described IPM module the three-phase of a described N direct current generator is exported to the first to the 6th control signal successively; During to the 6th control signal, obtain respectively the direct-axis voltage V of a described N direct current generator in output described first _dto obtain the maximum direct-axis voltage V of a described N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.

Preferably, the time of the time of the time of the time of the time of output the first control signal, output the second control signal, output the 3rd control signal, output the 4th control signal, the time of exporting the 5th control signal and output the 6th control signal equates and is 0.5-3 second.

In a specific embodiment of the present invention, when a direct current generator in a described N direct current generator lacks 1 phase time, described predetermined threshold value is calculated according to following formula:

$X=R\max /R\min =\frac{3}{4*(N-1)}+1$

Wherein, X is described predetermined threshold value, the maximum load resistance in the Rmax pull-up resistor between mutually that is pull-up resistor between mutually of the U phase of a described N direct current generator and VW, V phase with UW and the pull-up resistor between W phase and UV phase, and minimum load resistance in the Rmin pull-up resistor between mutually that is pull-up resistor between mutually of the U phase of a described N direct current generator and VW, V phase with UW and the pull-up resistor between W phase and UV phase, and $R\min =\frac{\frac{3*R}{2*(N-1)}*2*R}{\frac{3*R}{2*(N-1)}+2*R},$ R is the phase resistance of each described direct current generator.

For achieving the above object, the direct current motor system that another aspect of the present invention embodiment proposes, is characterized in that, comprising: N direct current generator, and a described N direct current generator is connected in parallel, and wherein, N is more than or equal to 2 integer; Be connected respectively to the IPM module of a described N direct current generator; Export six road pwm signals to the main control module of described IPM module so that a described N direct current generator is controlled, described main control module is for applying DC current I to the d-axis of a described N direct current generator _dand obtain the maximum direct-axis voltage V of a described N direct current generator _dmaxwith minimum direct-axis voltage V _dmin, as described maximum direct-axis voltage V _dmaxwith described minimum direct-axis voltage V _dminratio while being greater than predetermined threshold value, judge that described N direct current generator in described direct current motor system exists motor phase failure situation.

The direct current motor system proposing according to the embodiment of the present invention, main control module applies DC current I to the d-axis of N direct current generator _d, and obtain again the maximum direct-axis voltage V of N direct current generator _dmaxwith minimum direct-axis voltage V _dmin, as maximum direct-axis voltage V _dmaxwith minimum direct-axis voltage V _dminratio while being greater than predetermined threshold value, judge that N direct current generator in direct current motor system exists motor phase failure situation.Thus, this direct current motor system adopts 1 IPM module to control N direct current generator, can effectively save system cost, and can detect N direct current generator and whether have motor phase failure situation, thereby guarantee the normal operation of direct current motor system, ensure system performance, realize the reliable control of direct current motor system, avoid potential safety hazard.

In one embodiment of the invention, described main control module moves to preset electric angle speed specifically for controlling a described N direct current generator, and in Preset Time, detects in real time the direct-axis voltage V of a described N direct current generator _d, to obtain the maximum direct-axis voltage V of a described N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.

In another embodiment of the present invention, described main control module is exported the first to the 6th control signal specifically for controlling described IPM module successively to the three-phase of a described N direct current generator, and during to the 6th control signal, obtain respectively the direct-axis voltage V of a described N direct current generator in output described first _dto obtain the maximum direct-axis voltage V of a described N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.

Preferably, the time of the time of the time of the time of the time of output the first control signal, output the second control signal, output the 3rd control signal, output the 4th control signal, the time of exporting the 5th control signal and output the 6th control signal equates and is 0.5-3 second.

In a specific embodiment of the present invention, when a direct current generator in a described N direct current generator lacks 1 phase time, described predetermined threshold value is calculated according to following formula:

$X=R\max /R\min =\frac{3}{4*(N-1)}+1$

Wherein, X is described predetermined threshold value, the maximum load resistance in the Rmax pull-up resistor between mutually that is pull-up resistor between mutually of the U phase of a described N direct current generator and VW, V phase with UW and the pull-up resistor between W phase and UV phase, and minimum load resistance in the Rmin pull-up resistor between mutually that is pull-up resistor between mutually of the U phase of a described N direct current generator and VW, V phase with UW and the pull-up resistor between W phase and UV phase, and $R\min =\frac{\frac{3*R}{2*(N-1)}*2*R}{\frac{3*R}{2*(N-1)}+2*R},$ R is the phase resistance of each described direct current generator.

The aspect that the present invention is additional and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.

Brief description of the drawings

The present invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments obviously and easily and understand, wherein:

Fig. 1 is the direct current motor system structural representation that drives 1 direct current generator in correlation technique;

Fig. 2 is the direct current motor system structural representation that drives 2 direct current generators in correlation technique;

Fig. 3 is the direct current motor system structural representation that drives 3 direct current generators in correlation technique;

Fig. 4 is according to the process flow diagram of the method for detecting open phase of the direct current motor system of the embodiment of the present invention;

Fig. 5 a is the pull-up resistor connection diagram that does not have UVW three-phase in the situation of phase shortage according to 2 of the embodiment of the present invention direct current generators;

Fig. 5 b is according to the pull-up resistor connection diagram of UVW three-phase in the situation of the scarce U phase of 2 of the embodiment of the present invention direct current generators;

Fig. 5 c is according to the pull-up resistor connection diagram of UVW three-phase in the situation of the scarce V phase of 2 of the embodiment of the present invention direct current generators;

Fig. 5 d is according to the pull-up resistor connection diagram of UVW three-phase in the situation of the scarce W phase of 2 of the embodiment of the present invention direct current generators;

Fig. 6 is the process flow diagram of the method for detecting open phase of direct current motor system according to an embodiment of the invention;

Fig. 7 is the process flow diagram of the method for detecting open phase of direct current motor system in accordance with another embodiment of the present invention;

Fig. 8 is the process flow diagram of the method for detecting open phase of the direct current motor system of a specific embodiment according to the present invention;

Fig. 9 is direct-axis current and direct-axis voltage waveform schematic diagram in a specific embodiment according to the present invention;

Figure 10 is the process flow diagram of the method for detecting open phase of the direct current motor system of another specific embodiment according to the present invention;

Figure 11 is the schematic diagram of six control signals that in another specific embodiment, IPM module is exported successively to the three-phase of 3 direct current generators according to the present invention;

Figure 12 is according to the structural representation of the direct current motor system of the embodiment of the present invention;

Figure 13 is the structural representation of the direct current motor system of a specific embodiment according to the present invention; And

Figure 14 is the structural representation of the direct current motor system of another specific embodiment according to the present invention.

Reference numeral:

N direct current generator 10, IPM module 20 and main control module 30.

Embodiment

Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Be exemplary below by the embodiment being described with reference to the drawings, only for explaining the present invention, and can not be interpreted as limitation of the present invention.

Disclosing below provides many different embodiment or example to be used for realizing different structure of the present invention.Of the present invention open in order to simplify, hereinafter the parts to specific examples and setting are described.Certainly, they are only example, and object does not lie in restriction the present invention.In addition, the present invention can be in different examples repeat reference numerals and/or letter.This repetition is in order to simplify and object clearly, itself do not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique the invention provides and the example of material, but those of ordinary skill in the art can recognize the property of can be applicable to of other techniques and/or the use of other materials.In addition, First Characteristic described below Second Characteristic it " on " structure can comprise that the first and second Characteristics creations are the direct embodiment of contact, also can comprise the embodiment of other Characteristics creation between the first and second features, such the first and second features may not be direct contacts.

In description of the invention, it should be noted that, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be interpreted broadly, for example, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be to be directly connected, and also can indirectly be connected by intermediary, for the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term.

With reference to description and accompanying drawing below, these and other aspects of embodiments of the invention will be known.In these descriptions and accompanying drawing, specifically disclose some specific implementations in embodiments of the invention, represent some modes of the principle of implementing embodiments of the invention, but should be appreciated that the scope of embodiments of the invention is not limited.On the contrary, embodiments of the invention comprise all changes, amendment and the equivalent within the scope of spirit and the intension that falls into additional claims.

Method for detecting open phase and the direct current motor system of the direct current motor system proposing according to the embodiment of the present invention are described with reference to the accompanying drawings.

Fig. 4 is according to the process flow diagram of the method for detecting open phase of the direct current motor system of the embodiment of the present invention.Direct current motor system comprises N direct current generator in parallel, is connected respectively to IPM module (the Intelligent Power Module of N direct current generator, Intelligent Power Module) and output six road PWM (Pulse Width Modulation, pulse-length modulation) signal is to the main control module of IPM module so that N direct current generator controlled, and N is more than or equal to 2 integer.Specifically, IPM module is used for receiving main control module output Liu road pwm signal, and simultaneously to N direct current generator output U, V, W three-phase driving signal, N direct current generator module is according to U, the V of the output of IPM module, the running of W three-phase driving signal, i.e. speech, the U of N direct current generator is all connected with the U phase output terminal of IPM module mutually, and the V of N direct current generator is all connected with the V phase output terminal of IPM module mutually, and the W of N direct current generator is all connected with the W phase output terminal of IPM module mutually.

In one embodiment of the invention, the model of N direct current generator is identical.It should be noted that, here identical refers to the identical of broad sense, approximate identical.That is to say, the direct current motor system of the embodiment of the present invention is adapted to the occasion that need to simultaneously adopt the model of two or more direct current generators and multiple direct current generators identical, load is approaching, for example, the direct current motor system of the embodiment of the present invention is adapted to the two through-flow bi-motor indoor sets of air-conditioning, two wind wheel off-premises stations etc.

In addition, it should be noted that, compared with adopting 1 direct current generator of 1 IPM module drive in correlation technique, there is following technical barrier in N direct current generator of 1 IPM module drive of employing of the embodiment of the present invention: if 1 direct current generator of 1 IPM module drive, in the time there is motor phase failure situation, that of phase shortage, once in off-state, cannot detect this phase current, thereby can quote open-phase fault, reminding user; If N direct current generator of 1 IPM module drive, in the time of 1 direct current generator phase shortage wherein, because U, V, the W three-phase of other direct current generator are still communicated with, the phase current that still can detect U, V, W three-phase, thus, correlation technique cannot detect scarce electrical fault, in the time there is open-phase fault, if continue operation direct current motor system, can affect the performance of system, and may have potential safety hazard.Based on this, the embodiment of the present invention proposes a kind of method for detecting open phase of direct current motor system.

In embodiments of the present invention, as shown in Figure 4, the phase shortage detection system of this direct current motor system comprises the following steps:

S1: apply DC current I to the d-axis of N direct current generator _d.

Specifically, can be by IPM module to N in parallel direct current generator output DC current I _d.Preferably, DC current I _dcurrent value can be less than the demagnetization current of single direct current generator in N direct current generator.For example, the demagnetization current of single direct current generator can be 1.5 amperes, DC current I _dcurrent value can be 0.6 ampere.

Wherein, it should be noted that, in an embodiment of the present invention, can regard N direct current generator as an integrated motor model, the d-axis of N direct current generator is the d-axis of this integrated motor model, applies DC current I to the d-axis of N direct current generator _dbe to the d-axis of integrated motor model and apply DC current I _d.

S2: the maximum direct-axis voltage V that obtains N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.

In one embodiment of the invention, step S2 specifically comprises: control N direct current generator to preset the operation of electric angle speed omega, control each direct current generator to preset the operation of electric angle speed omega; In Preset Time, detect in real time the direct-axis voltage V of N direct current generator _dto obtain the maximum direct-axis voltage V of N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.

That is to say, can control N direct current generator to preset electric angle speed omega operation, N direct current generator with the process of presetting electric angle speed omega and turning round in, the direct-axis voltage V of real time record N direct current generator _d, after Preset Time, according to the direct-axis voltage V of N direct current generator of record _dobtain maximum direct-axis voltage V _dmaxwith minimum direct-axis voltage V _dmin.

Wherein, it should be noted that, Preset Time should be greater than the machine operation cycle of single direct current generator in N direct current generator, the direct-axis voltage V of N direct current generator _dfor the direct-axis voltage of integrated motor model, default electric angle speed omega can be within the scope of 0.1Hz-3Hz value.

In another embodiment, step S2 specifically comprises: control IPM module the three-phase of N direct current generator is exported to the first to the 6th control signal successively; During to the 6th control signal, obtain respectively the direct-axis voltage V of N direct current generator in output first _dto obtain the maximum direct-axis voltage V of N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.Wherein, the time of the time of the time of the time of the time of output the first control signal, output the second control signal, output the 3rd control signal, output the 4th control signal, the time of exporting the 5th control signal and output the 6th control signal equates and is 0.5-3 second.

That is to say, control IPM module the UVW three-phase of direct current generator is exported to 100,110,010 successively, 011,001,101 6 state vectors, each state vector output time is T, when the state vector of output is 100, while exporting the first control signal, obtain the direct-axis voltage V of N direct current generator _d100; When the state vector of output becomes 110, while exporting the second control signal, obtain the direct-axis voltage V of N direct current generator _d110; When the state vector of output is 010, while exporting the 3rd control signal, obtain the direct-axis voltage V of N direct current generator _d010; When the state vector of output is 011, while exporting the 4th control signal, obtain the direct-axis voltage V of N direct current generator _d011; When the state vector of output is 001, while exporting the 5th control signal, obtain the direct-axis voltage V of N direct current generator _d001; When the state vector of output is 101, while exporting the 6th control signal, obtain the direct-axis voltage V of N direct current generator _d101.By V _d100, V _d110, V _d010, V _d011, V _d001and V _d101in maximal value be designated as maximum direct-axis voltage V _dmax, minimum value is designated as minimum direct-axis voltage V _dminthereby, obtain the maximum direct-axis voltage V of N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.

Wherein, it should be noted that, IPM module can comprise the inverter being become by six set of power switches, if the conducting state of the device for power switching of the upper brachium pontis of inverter is represented with " 1 ", off state represents with " 0 ", six state vectors 100,110,010,011,001,101 is the on off state of the device for power switching of the corresponding upper brachium pontis of UVW tri-.For example, in the time that the device for power switching of the corresponding upper brachium pontis of device for power switching conducting, the VW of the corresponding upper brachium pontis of control U turn-offs, IPM module is exported the first control signal to the UVW three-phase of N direct current generator, i.e. state vector 100.

Thus, control the on off state of the device for power switching of the corresponding upper brachium pontis of UVW tri-in IPM module, to control IPM module, the three-phase of N direct current generator is exported to the first to the 6th control signal, i.e. six state vectors 100,110 successively, 010,011,001,101, and during to the 6th control signal, obtain respectively the direct-axis voltage V of N direct current generator in output first _dto obtain the maximum direct-axis voltage V of N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.

Be understandable that, the time of the time of output the first control signal, the time of output the second control signal, output the 3rd control signal, the time of output the 4th control signal, the time of output the 5th control signal and the time of output the 6th control signal are each state vector output time T.Due to DC current I _d, direct-axis voltage V _dafter stable, direct current generator can be regarded pure resistive load as, so each state vector output time T should be and ensures DC current I _d, direct-axis voltage V _dreach and stablize the required retention time.Preferably, preset time T can be between 0.5 second-3 seconds value.

S3: as maximum direct-axis voltage V _dmaxwith minimum direct-axis voltage V _dminratio while being greater than predetermined threshold value X, judge that N direct current generator in direct current motor system exists motor phase failure situation.

In the time judging that N direct current generator in direct current motor system exists motor phase failure situation, can point out user.

In a specific embodiment of the present invention, when a direct current generator in N direct current generator lacks 1 phase time, predetermined threshold value X calculates according to following formula:

$X=R\max /R\min =\frac{3}{4*(N-1)}+1---\left(1\right)$

Wherein, X is predetermined threshold value, the maximum load resistance in the Rmax pull-up resistor between mutually that is pull-up resistor between mutually of the U phase of N direct current generator and VW, V phase with UW and the pull-up resistor between W phase and UV phase, and minimum load resistance in the Rmin pull-up resistor between mutually that is pull-up resistor between mutually of the U phase of N direct current generator and VW, V phase with UW and the pull-up resistor between W phase and UV phase, and $R\min =\frac{\frac{3*R}{2*(N-1)}*2*R}{\frac{3*R}{2*(N-1)}+2*R},$ R is the phase resistance of each direct current generator.

That is to say, predetermined threshold value X can determine according to the quantity N of parallel connection direct motor, when a direct current generator in N direct current generator lacks 1 phase time, can obtain respectively the pull-up resistor between pull-up resistor between pull-up resistor between mutually of N direct current generator U phase and VW, a N direct current generator V phase and UW phase and N direct current generator W phase and UV phase, and using maximal value wherein as maximum equivalent pull-up resistor Rmax, using minimum value wherein as minimum load resistance R min.

Particularly, be example with 2 parallel connection direct motors and six state vectors 100,110,010,011,001,101, describe the pull-up resistor between U phase and VW phase in detail.As shown in Fig. 5 a-Fig. 5 d, in the time of output state vector 100, V phase and W are connected together; In the time of output state vector 110, U phase and V are connected together; In the time of output state vector 010, U phase and W are connected together; In the time of output state vector 011, V phase and W are connected together; In the time of output state vector 001, U phase and V are connected together; In the time of output state vector 101, U phase and W are connected together.Like this, as shown in Figure 5 a, under normal circumstances, there is not the situation of phase shortage in 2 direct current generators, and in six state vectors 100,110,010,011,001,101 time, U phase and the VW pull-up resistor between is mutually 3R/4.As shown in Figure 5 b, lack U phase in the situation that at 1 direct current generator, when output state vector 100,011 o'clock, U phase and the VW pull-up resistor between was mutually 3R/2, and when output state vector 110,010,001,101 o'clock, the pull-up resistor between U phase and VW phase was 6R/7.As shown in Figure 5 c, lack V phase in the situation that at 1 direct current generator, when output state vector 010,101 o'clock, U phase and the VW pull-up resistor between was mutually 3R/2, and when output state vector 100,110,011,001 o'clock, the pull-up resistor between U phase and VW phase was 6R/7.As shown in Fig. 5 d, lack W phase in the situation that at 1 direct current generator, when output state vector 110,001 o'clock, U phase and the VW pull-up resistor between was mutually 3R/2, when output state vector 100,010,011,101 o'clock, the pull-up resistor between U phase and VW phase was 6R/7.

In like manner, also can obtain the pull-up resistor between pull-up resistor, W phase and the UV phase between V phase and UW phase.

Thus, can obtain respectively the pull-up resistor between pull-up resistor between mutually of pull-up resistor between mutually of 2 direct current generator U phases and VW, 2 direct current generator V phases and UW and 2 direct current generator W phases and UV phase, and using maximal value wherein as maximum equivalent pull-up resistor Rmax, for example Rmax=3R/2, using minimum value wherein for example, as minimum load resistance R min, Rmin=6R/7.

In addition, when predetermined threshold value X is set, can suitably adjust predetermined threshold value X actual in conjunction with formula (1) and actual test result.

Generally speaking, in one embodiment of the invention, as shown in Figure 6, the method for detecting open phase of this direct current motor system comprises the following steps:

S101: apply DC current I to the d-axis of N direct current generator _d.

S102: control N direct current generator to preset the operation of electric angle speed omega.

S103: in Preset Time, detect in real time the direct-axis voltage V of N direct current generator _d.

S104: the maximum direct-axis voltage V that obtains N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.

S105: judge maximum direct-axis voltage V _dmaxwith minimum direct-axis voltage V _dminratio whether be greater than predetermined threshold value X.If so, perform step S106; If not, perform step S107.

S106: the direct current generator of the N in direct current motor system exists motor phase failure situation.

S107: the direct current generator of the N in direct current motor system does not exist motor phase failure situation.

In another embodiment of the present invention, as shown in Figure 7, the method for detecting open phase of this direct current motor system comprises the following steps:

S201: apply DC current I to the d-axis of N direct current generator _d.

S202: control IPM module the three-phase of N direct current generator is exported to the first to the 6th control signal successively.

Control IPM module the UVW three-phase of direct current generator is exported to 100,110,010,011 successively, 001,101 six state vector.

S203: during to the 6th control signal, obtain respectively the direct-axis voltage V of N direct current generator in output first _d.

In the time of 100,110,010,011,001,101 six state vector of output, obtain respectively the direct-axis voltage V of N direct current generator _d.

S204: the maximum direct-axis voltage V that obtains N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.

S205: judge maximum direct-axis voltage V _dmaxwith minimum direct-axis voltage V _dminratio whether be greater than predetermined threshold value X.If so, perform step S206; If not, perform step S207.

S206: the direct current generator of the N in direct current motor system exists motor phase failure situation.

S207: the direct current generator of the N in direct current motor system does not exist motor phase failure situation.

Below as an example of N=2 example and N=3 be example, describe the method for detecting open phase of the direct current motor system of the embodiment of the present invention in detail.

In a specific embodiment of the present invention, work as N=2, the quantity of direct current generator is 2 o'clock, as shown in Figure 8, the method for detecting open phase of the direct current motor system of the embodiment of the present invention comprises the following steps:

S301: apply DC current I to the d-axis of 2 direct current generators _d.For example, DC current I _dcan be 0.6 ampere.

S302: control 2 direct current generators to preset the operation of electric angle speed omega.For example, default electric angle speed omega can be 0.5Hz.

S303: in Preset Time, detect in real time the direct-axis voltage V of 2 direct current generators _d.

In the present embodiment, the waveform schematic diagram of the direct-axis current of 2 direct current generators and direct-axis voltage is illustrated in figure 9.At phase shortage detection-phase, if while there is motor phase failure situation, direct-axis voltage is as shown in curve 1; If there is no motor phase failure situation, direct-axis voltage is as shown in curve 2.

S304: the maximum direct-axis voltage V that obtains 2 direct current generators _dmaxwith minimum direct-axis voltage V _dmin.

S305: judge maximum direct-axis voltage V _dmaxwith minimum direct-axis voltage V _dminratio whether be greater than predetermined threshold value X.If so, perform step S306; If not, perform step S307.

Particularly, predetermined threshold value $X=R\max /R\min =\frac{3}{4*(N-1)}+1=\frac{3}{4*(2-1)}+1=1.75.$ In the present embodiment, predetermined threshold value X can be set to 1.75.

S306: 2 direct current generators in direct current motor system exist motor phase failure situation.

S307: 2 direct current generators in direct current motor system do not exist motor phase failure situation.

In another specific embodiment of the present invention, work as N=3, the quantity of direct current generator is 3 o'clock, as shown in figure 10, the method for detecting open phase of the direct current motor system of the embodiment of the present invention comprises the following steps:

S401: apply DC current I to the d-axis of 3 direct current generators _d.

S402: control IPM module the three-phase of 3 direct current generators is exported to the first to the 6th control signal successively.

Control IPM module the UVW three-phase of direct current generator is exported to 100,110,010,011 successively, 001,101 six state vector, as shown in figure 11.

S403: during to the 6th control signal, obtain respectively the direct-axis voltage V of 3 direct current generators in output first _d.

In the time of 100,110,010,011,001,101 six state vector of output, obtain respectively the direct-axis voltage V of N direct current generator _d.

S404: the maximum direct-axis voltage V that obtains 3 direct current generators _dmaxwith minimum direct-axis voltage V _dmin.

S405: judge maximum direct-axis voltage V _dmaxwith minimum direct-axis voltage V _dminratio whether be greater than predetermined threshold value X.If so, perform step S406; If not, perform step S407.

Particularly, predetermined threshold value $X=R\max /R\min =\frac{3}{4*(N-1)}+1=\frac{3}{4*(3-1)}+1=\frac{11}{8}.$ In the present embodiment, predetermined threshold value X can be set to 1.4.

S406: 3 direct current generators in direct current motor system exist motor phase failure situation.

S407: 3 direct current generators in direct current motor system do not exist motor phase failure situation.

To sum up, the method for detecting open phase of the direct current motor system proposing according to the embodiment of the present invention, first applies DC current I to the d-axis of N direct current generator _d, then obtain the maximum direct-axis voltage V of N direct current generator _dmaxwith minimum direct-axis voltage V _dmin, as maximum direct-axis voltage V _dmaxwith minimum direct-axis voltage V _dminratio while being greater than predetermined threshold value, judge that N direct current generator in direct current motor system exists motor phase failure situation.Thus, in the direct current motor system that adopts 1 IPM module to control N direct current generator, this method for detecting open phase can detect N direct current generator and whether have motor phase failure situation, thereby guarantee the normal operation of direct current motor system, ensure system performance, realize the reliable control of direct current motor system, avoid potential safety hazard.

Figure 12 is according to the structural representation of the direct current motor system of the embodiment of the present invention.As shown in figure 12, direct current motor system comprises N direct current generator 10, IPM module 20 and main control module 30.

The direct current motor system of the embodiment of the present invention can adopt a main control module 30 to control an IPM module 20 driving N direct current generator 10.Main control module 30 is for sending six road pwm control signals to IPM module 20, and obtain U, V, the W three-phase current of N direct current generator, to estimate rotating speed and the position of N DC motor rotor according to the U, the V that obtain, W three-phase current, realize the real-time control to N direct current generator, wherein, can gather N direct current generator U, V, W three-phase current by the current sensor of IPM module 20 outsides or current sampling resistor.IPM module 20 is exported Liu road pwm control signal for receiving main control module 30, and exports U, V, W three-phase driving signal to N direct current generator 10 simultaneously, and N direct current generator 10 turns round for U, V, the W three-phase driving signal exported according to IPM module 20.Wherein, the U of N direct current generator 10 is all connected with the U phase output terminal of IPM module 20 mutually, and the V of N direct current generator 10 is all connected with the V phase output terminal of IPM module 20 mutually, and the W of N direct current generator 10 is all connected with the W phase output terminal of IPM module 20 mutually.

Thus, compared with adopting 1 direct current generator of 1 IPM module drive in correlation technique, there is following technical barrier in N direct current generator of 1 IPM module drive of employing of the embodiment of the present invention: if 1 direct current generator of 1 IPM module drive, in the time there is motor phase failure situation, that of phase shortage is once in off-state, this phase current cannot be detected, thereby open-phase fault, reminding user can be quoted; If N direct current generator of 1 IPM module drive, in the time of 1 direct current generator phase shortage wherein, because U, V, the W three-phase of other direct current generator are still communicated with, the phase current that still can detect U, V, W three-phase, thus, correlation technique cannot detect scarce electrical fault, in the time there is open-phase fault, if continue operation direct current motor system, can affect the performance of system, and may have potential safety hazard.Based on this, the embodiment of the present invention proposes a kind of direct current motor system.

In embodiments of the present invention, as shown in figure 12, N direct current generator 10 is connected in parallel, and N can be the integer that is more than or equal to 2, for example, N direct current generator 10 can be direct current generator 1, direct current generator 2 ..., direct current generator N; IPM module 20 is connected respectively to N direct current generator 10; Main control module 30 for export six road pwm signals to IPM module 20 so that N direct current generator 10 controlled, main control module 30 is for applying DC current I to the d-axis of N direct current generator _dand obtain the maximum direct-axis voltage V of N direct current generator _dmaxwith minimum direct-axis voltage V _dmin, as maximum direct-axis voltage V _dmaxwith minimum direct-axis voltage V _dminratio while being greater than predetermined threshold value, judge that N direct current generator 10 in direct current motor system exists motor phase failure situation.

In one embodiment of the invention, main control module 30 moves to preset electric angle speed specifically for controlling N direct current generator 10, and in Preset Time, detects in real time the direct-axis voltage V of N direct current generator _d, to obtain the maximum direct-axis voltage V of N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.

Specifically, main control module 30 can be controlled IPM module 20 and export DC current I to a N in parallel direct current generator 10 _d, and control N direct current generator 10 to preset electric angle speed operation, N direct current generator 10 with the process of presetting electric angle speed and moving in, the direct-axis voltage V of real time record N direct current generator _d, after Preset Time, main control module 30 can be according to the direct-axis voltage V of N direct current generator of record _dobtain maximum direct-axis voltage V _dmaxwith minimum direct-axis voltage V _dmin.Like this, as maximum direct-axis voltage V _dmaxwith minimum direct-axis voltage V _dminratio while being greater than predetermined threshold value X, main control module 30 judges that N direct current generator in direct current motor system exists motor phase failure situation, meanwhile, main control module 30 can be controlled alarm set and point out to user.

Preferably, DC current I _dcurrent value can be less than the demagnetization current of single direct current generator in N direct current generator.For example, the demagnetization current of single direct current generator can be 1.5 amperes, DC current I _dcurrent value can be 0.6 ampere.Preset Time should be greater than the machine operation cycle of single direct current generator in N direct current generator, default electric angle speed omega can be within the scope of 0.1Hz-3Hz value.

Wherein, it should be noted that, in an embodiment of the present invention, can regard N direct current generator as an integrated motor model, the d-axis of N direct current generator is the d-axis of this integrated motor model, applies DC current I to the d-axis of N direct current generator _dbe to the d-axis of integrated motor model and apply DC current I _d, the direct-axis voltage V of N direct current generator _dfor the direct-axis voltage of integrated motor model.

In another embodiment, main control module 30 is exported the first to the 6th control signal specifically for controlling IPM module 20 successively to the three-phase of N direct current generator 10, and during to the 6th control signal, obtain respectively the direct-axis voltage V of N direct current generator in output first _dto obtain the maximum direct-axis voltage V of N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.Wherein, the time of the time of the time of the time of the time of output the first control signal, output the second control signal, output the 3rd control signal, output the 4th control signal, the time of exporting the 5th control signal and output the 6th control signal equates and is 0.5-3 second.

Specifically, main control module 30 can be controlled IPM module 20 and export DC current I to a N in parallel direct current generator 10 _dand IPM module 20 exports 100 successively to the UVW three-phase of N direct current generator 10,110,010,011,001,101 6 state vectors, each state vector output time is T, when the state vector of output is 100,, while exporting the first control signal, main control module 30 obtains the direct-axis voltage V of N direct current generator _d100; When the state vector of output becomes 110, while exporting the second control signal, main control module 30 obtains the direct-axis voltage V of N direct current generator _d110; When the state vector of output is 010, while exporting the 3rd control signal, main control module 30 obtains the direct-axis voltage V of N direct current generator _d010; When the state vector of output is 011, while exporting the 4th control signal, main control module 30 obtains the direct-axis voltage V of N direct current generator _d011; When the state vector of output is 001, while exporting the 5th control signal, main control module 30 obtains the direct-axis voltage V of N direct current generator _d001; When the state vector of output is 101, while exporting the 6th control signal, main control module 30 obtains the direct-axis voltage V of N direct current generator _d101.Main control module 30 is by V _d100, V _d110, V _d010, V _d011, V _d001and V _d101in maximal value be designated as maximum direct-axis voltage V _dmax, minimum value is designated as minimum direct-axis voltage V _dminthereby, obtain the maximum direct-axis voltage V of N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.Like this, as maximum direct-axis voltage V _dmaxwith minimum direct-axis voltage V _dminratio while being greater than predetermined threshold value X, main control module 30 judges that N direct current generator in direct current motor system exists motor phase failure situation, meanwhile, main control module 30 can be controlled alarm set and point out to user.

Wherein, it should be noted that, IPM module 20 can comprise the inverter being become by six set of power switches, if the conducting state of the device for power switching of the upper brachium pontis of inverter is represented with " 1 ", off state represents with " 0 ", six state vectors 100,110,010,011,001,101 is the on off state of the device for power switching of the corresponding upper brachium pontis of UVW tri-.For example, when the device for power switching of controlling the corresponding upper brachium pontis of device for power switching conducting, the VW of the corresponding upper brachium pontis of U in IPM module 20 when main control module 30 turn-offs, IPM module 20 is exported the first control signal to the UVW three-phase of N direct current generator 10, i.e. state vector 100.

Thus, main control module 30 is controlled the on off state of the device for power switching of the corresponding upper brachium pontis of UVW tri-in IPM module 20, to control IPM module, the three-phase of N direct current generator 10 is exported to the first to the 6th control signal, i.e. six state vectors 100,110 successively, 010,011,001,101, and in output first during to the 6th control signal, main control module 30 obtains respectively the direct-axis voltage V of N direct current generator _dto obtain the maximum direct-axis voltage V of N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.

Be understandable that, the time of the time of output the first control signal, the time of output the second control signal, output the 3rd control signal, the time of output the 4th control signal, the time of output the 5th control signal and the time of output the 6th control signal are each state vector output time T.Due to DC current I _d, direct-axis voltage V _dafter stable, direct current generator can be regarded pure resistive load as, so each state vector output time T should be and ensures DC current I _d, direct-axis voltage V _dreach and stablize the required retention time.Preferably, preset time T can be between 0.5 second-3 seconds value.

Further, in an embodiment of the present invention, when a direct current generator in N direct current generator lacks 1 phase time, predetermined threshold value X calculates according to following formula:

$X=R\max /R\min =\frac{3}{4*(N-1)}+1---\left(1\right)$

Wherein, X is predetermined threshold value, the maximum load resistance in the Rmax pull-up resistor between mutually that is pull-up resistor between mutually of the U phase of N direct current generator and VW, V phase with UW and the pull-up resistor between W phase and UV phase, and minimum load resistance in the Rmin pull-up resistor between mutually that is pull-up resistor between mutually of the U phase of N direct current generator and VW, V phase with UW and the pull-up resistor between W phase and UV phase, and $R\min =\frac{\frac{3*R}{2*(N-1)}*2*R}{\frac{3*R}{2*(N-1)}+2*R},$ R is the phase resistance of each direct current generator.

That is to say, predetermined threshold value X can determine according to the quantity N of parallel connection direct motor, when a direct current generator in N direct current generator lacks 1 phase time, can obtain respectively the pull-up resistor between pull-up resistor between pull-up resistor between mutually of N direct current generator U phase and VW, a N direct current generator V phase and UW phase and N direct current generator W phase and UV phase, and using maximal value wherein as maximum equivalent pull-up resistor Rmax, using minimum value wherein as minimum load resistance R min.

Particularly, be example with 2 parallel connection direct motors and six state vectors 100,110,010,011,001,101, describe the pull-up resistor between U phase and VW phase in detail.As shown in Fig. 5 a-Fig. 5 d, in the time of output state vector 100, V phase and W are connected together; In the time of output state vector 110, U phase and V are connected together; In the time of output state vector 010, U phase and W are connected together; In the time of output state vector 011, V phase and W are connected together; In the time of output state vector 001, U phase and V are connected together; In the time of output state vector 101, U phase and W are connected together.Like this, as shown in Figure 5 a, under normal circumstances, there is not the situation of phase shortage in 2 direct current generators, and in six state vectors 100,110,010,011,001,101 time, U phase and the VW pull-up resistor between is mutually 3R/4.As shown in Figure 5 b, lack U phase in the situation that at 1 direct current generator, when output state vector 100,011 o'clock, U phase and the VW pull-up resistor between was mutually 3R/2, and when output state vector 110,010,001,101 o'clock, the pull-up resistor between U phase and VW phase was 6R/7.As shown in Figure 5 c, lack V phase in the situation that at 1 direct current generator, when output state vector 010,101 o'clock, U phase and the VW pull-up resistor between was mutually 3R/2, and when output state vector 100,110,011,001 o'clock, the pull-up resistor between U phase and VW phase was 6R/7.As shown in Fig. 5 d, lack W phase in the situation that at 1 direct current generator, when output state vector 110,001 o'clock, U phase and the VW pull-up resistor between was mutually 3R/2, when output state vector 100,010,011,101 o'clock, the pull-up resistor between U phase and VW phase was 6R/7.

In like manner, also can obtain the pull-up resistor between pull-up resistor, W phase and the UV phase between V phase and UW phase.

Thus, obtain respectively the pull-up resistor between pull-up resistor between mutually of pull-up resistor between mutually of 2 direct current generator U phases and VW, 2 direct current generator V phases and UW and 2 direct current generator W phases and UV phase, and using maximal value wherein as maximum equivalent pull-up resistor Rmax, for example Rmax=3R/2, using minimum value wherein for example, as minimum load resistance R min, Rmin=6R/7.

In addition, when predetermined threshold value X is set, can suitably adjust predetermined threshold value X actual in conjunction with formula (1) and actual test result.

Below as an example of N=2 example and N=3 be example, describe the direct current motor system of the embodiment of the present invention in detail.

In a specific embodiment of the present invention, work as N=2, the quantity of direct current generator is 2 o'clock, as shown in figure 13, direct current motor system comprises: 2 direct current generators 10, IPM module 20, main control module 30.Wherein, 2 direct current generators 10 can be direct current generator 1 and direct current generator 2, main control module 30 is for sending six road pwm control signals to IPM module 20, and gather the electric current of 2 parallel connection direct motors, IPM module 20 is exported Liu road pwm control signal for receiving main control module 30, and export three-phase driving signal to 2 direct current generators 10,2 direct current generators 10 turn round for the three-phase driving signal of exporting according to IPM module 20.

Specifically, main control module 30 can be controlled IPM module 20 and export DC current I to 2 direct current generators 10 of parallel connection _d, and control 2 direct current generators 10 to preset electric angle speed operation, at 2 direct current generators 10 to preset in the process of electric angle speed operation, the direct-axis voltage V of 2 direct current generators of real time record _d, after Preset Time, main control module 30 can be according to the direct-axis voltage V of 2 direct current generators of record _dobtain maximum direct-axis voltage V _dmaxwith minimum direct-axis voltage V _dmin.Like this, as maximum direct-axis voltage V _dmaxwith minimum direct-axis voltage V _dminratio while being greater than predetermined threshold value X, main control module 30 judges that 2 direct current generators in direct current motor system exist motor phase failure situation, meanwhile, main control module 30 can be controlled alarm set and point out to user.Particularly, default electric angle speed omega can be 0.5Hz, predetermined threshold value $X=R\max /R\min =\frac{3}{4*(N-1)}+1=\frac{3}{4*(2-1)}+1=1.75.$ In the present embodiment, predetermined threshold value X can be set to 1.75.

In another specific embodiment of the present invention, work as N=3, the quantity of direct current generator is 3 o'clock, as shown in figure 14, direct current motor system comprises: 3 direct current generators 10, IPM module 20, main control module 30.Wherein, 3 direct current generators 10 can be direct current generator 1, direct current generator 2 and direct current generator 3, main control module 30 is for sending six road pwm control signals to IPM module 20, and gather the electric current of 3 parallel connection direct motors, IPM module 20 is exported Liu road pwm control signal for receiving main control module 30, and export three-phase driving signal to 3 direct current generators 10,3 direct current generators 10 turn round for the three-phase driving signal of exporting according to IPM module 20.

Specifically, main control module 30 can be controlled IPM module 20 and export DC current I to 3 direct current generators 10 of parallel connection _dand IPM module 20 exports 100 successively to the UVW three-phase of 3 direct current generators 10,110,010,011,001,101 6 state vectors, each state vector output time is T, when the state vector of output is 100,, while exporting the first control signal, main control module 30 obtains the direct-axis voltage V of 3 direct current generators _d100; When the state vector of output becomes 110, while exporting the second control signal, main control module 30 obtains the direct-axis voltage V of 3 direct current generators _d110; When the state vector of output is 010, while exporting the 3rd control signal, main control module 30 obtains the direct-axis voltage V of 3 direct current generators _d010; When the state vector of output is 011, while exporting the 4th control signal, main control module 30 obtains the direct-axis voltage V of 3 direct current generators _d011; When the state vector of output is 001, while exporting the 5th control signal, main control module 30 obtains the direct-axis voltage V of 3 direct current generators _d001; When the state vector of output is 101, while exporting the 6th control signal, main control module 30 obtains the direct-axis voltage V of 3 direct current generators _d101.Main control module 30 is by V _d100, V _d110, V _d010, V _d011, V _d001and V _d101in maximal value be designated as maximum direct-axis voltage V _dmax, minimum value is designated as minimum direct-axis voltage V _dminthereby, obtain the maximum direct-axis voltage V of N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.Like this, as maximum direct-axis voltage V _dmaxwith minimum direct-axis voltage V _dminratio while being greater than predetermined threshold value X, main control module 30 judges that 3 direct current generators in direct current motor system exist motor phase failure situation, meanwhile, main control module 30 can be controlled alarm set and point out to user.Particularly, predetermined threshold value $X=R\max /R\min =\frac{3}{4*(N-1)}+1=\frac{3}{4*(3-1)}+1=\frac{11}{8}.$ In the present embodiment, predetermined threshold value X can be set to 1.4.

In addition, in embodiments of the present invention, the model of N direct current generator 10 is identical.It should be noted that, here identical refers to the identical of broad sense, approximate identical.That is to say, the direct current motor system of the embodiment of the present invention is adapted to the occasion that need to simultaneously adopt the model of two or more direct current generators and multiple direct current generators identical, load is approaching, for example, the direct current motor system of the embodiment of the present invention is adapted to the two through-flow bi-motor indoor sets of air-conditioning, two wind wheel off-premises stations etc.In a concrete example of the present invention, main control module 30 can be MCU (Micro Control Unit, micro-control unit).

To sum up, the direct current motor system proposing according to the embodiment of the present invention, main control module applies DC current I to the d-axis of N direct current generator _d, and obtain again the maximum direct-axis voltage V of N direct current generator _dmaxwith minimum direct-axis voltage V _dmin, as maximum direct-axis voltage V _dmaxwith minimum direct-axis voltage V _dminratio while being greater than predetermined threshold value, judge that N direct current generator in direct current motor system exists motor phase failure situation.Thus, this direct current motor system adopts 1 IPM module to control N direct current generator, can effectively save system cost, and can detect N direct current generator and whether have motor phase failure situation, thereby guarantee the normal operation of direct current motor system, ensure system performance, realize the reliable control of direct current motor system, avoid potential safety hazard.

Any process of otherwise describing in process flow diagram or at this or method are described and can be understood to, represent to comprise that one or more is for realizing module, fragment or the part of code of executable instruction of step of specific logical function or process, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can be not according to order shown or that discuss, comprise according to related function by the mode of basic while or by contrary order, carry out function, this should be understood by embodiments of the invention person of ordinary skill in the field.

The logic and/or the step that in process flow diagram, represent or otherwise describe at this, for example, can be considered to the sequencing list of the executable instruction for realizing logic function, may be embodied in any computer-readable medium, use for instruction execution system, device or equipment (as computer based system, comprise that the system of processor or other can and carry out the system of instruction from instruction execution system, device or equipment instruction fetch), or use in conjunction with these instruction execution systems, device or equipment.With regard to this instructions, " computer-readable medium " can be anyly can comprise, device that storage, communication, propagation or transmission procedure use for instruction execution system, device or equipment or in conjunction with these instruction execution systems, device or equipment.The example more specifically (non-exhaustive list) of computer-readable medium comprises following: the electrical connection section (electronic installation) with one or more wirings, portable computer diskette box (magnetic device), random access memory (RAM), ROM (read-only memory) (ROM), the erasable ROM (read-only memory) (EPROM or flash memory) of editing, fiber device, and portable optic disk ROM (read-only memory) (CDROM).In addition, computer-readable medium can be even paper or other the suitable medium that can print described program thereon, because can be for example by paper or other media be carried out to optical scanning, then edit, decipher or process in electronics mode and obtain described program with other suitable methods if desired, be then stored in computer memory.

Should be appreciated that each several part of the present invention can realize with hardware, software, firmware or their combination.In the above-described embodiment, multiple steps or method can realize with being stored in software or the firmware carried out in storer and by suitable instruction execution system.For example, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: there is the discrete logic for data-signal being realized to the logic gates of logic function, there is the special IC of suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.

Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is can carry out the hardware that instruction is relevant by program to complete, described program can be stored in a kind of computer-readable recording medium, this program, in the time carrying out, comprises step of embodiment of the method one or a combination set of.

In addition, the each functional unit in each embodiment of the present invention can be integrated in a processing module, can be also that the independent physics of unit exists, and also can be integrated in a module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.If described integrated module realizes and during as production marketing independently or use, also can be stored in a computer read/write memory medium using the form of software function module.

The above-mentioned storage medium of mentioning can be ROM (read-only memory), disk or CD etc.

In the description of this instructions, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And specific features, structure, material or the feature of description can be with suitable mode combination in any one or more embodiment or example.

Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, amendment, replacement and modification to these embodiment, scope of the present invention is by claims and be equal to and limit.

Claims (10)

1. the method for detecting open phase of a direct current motor system, it is characterized in that, described direct current motor system comprises N direct current generator in parallel, is connected respectively to IPM module and the extremely main control module of described IPM module so that a described N direct current generator is controlled of output six road pwm signals of a described N direct current generator, N is more than or equal to 2 integer, and described method for detecting open phase comprises the following steps:

D-axis to a described N direct current generator applies DC current I _d;

Obtain the maximum direct-axis voltage V of a described N direct current generator _dmaxwith minimum direct-axis voltage V _dmin;

As described maximum direct-axis voltage V _dmaxwith described minimum direct-axis voltage V _dminratio while being greater than predetermined threshold value, judge that described N direct current generator in described direct current motor system exists motor phase failure situation.

2. the method for detecting open phase of direct current motor system according to claim 1, is characterized in that, obtains the maximum direct-axis voltage V of a described N direct current generator _dmaxwith minimum direct-axis voltage V _dmin, specifically comprise:

Control a described N direct current generator to preset the operation of electric angle speed;

In Preset Time, detect in real time the direct-axis voltage V of a described N direct current generator _dto obtain the maximum direct-axis voltage V of a described N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.

3. the method for detecting open phase of direct current motor system according to claim 1, is characterized in that, obtains the maximum direct-axis voltage V of a described N direct current generator _dmaxwith minimum direct-axis voltage V _dmin, specifically comprise:

Control described IPM module the three-phase of a described N direct current generator is exported to the first to the 6th control signal successively;

During to the 6th control signal, obtain respectively the direct-axis voltage V of a described N direct current generator in output described first _dto obtain the maximum direct-axis voltage V of a described N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.

4. the method for detecting open phase of direct current motor system according to claim 3, it is characterized in that, the time of the time of the time of output the first control signal, the time of output the second control signal, output the 3rd control signal, the time of output the 4th control signal, the time of exporting the 5th control signal and output the 6th control signal equates and is 0.5-3 second.

5. according to the method for detecting open phase of the direct current motor system described in any one in claim 1-4, it is characterized in that, when a direct current generator in a described N direct current generator lacks 1 phase time, described predetermined threshold value is calculated according to following formula:

$X=R\max /R\min =\frac{3}{4*(N-1)}+1$

Wherein, X is described predetermined threshold value, the maximum load resistance in the Rmax pull-up resistor between mutually that is pull-up resistor between mutually of the U phase of a described N direct current generator and VW, V phase with UW and the pull-up resistor between W phase and UV phase, and minimum load resistance in the Rmin pull-up resistor between mutually that is pull-up resistor between mutually of the U phase of a described N direct current generator and VW, V phase with UW and the pull-up resistor between W phase and UV phase, and $R\min =\frac{\frac{3*R}{2*(N-1)}*2*R}{\frac{3*R}{2*(N-1)}+2*R},$ R is the phase resistance of each described direct current generator.

6. a direct current motor system, is characterized in that, comprising:

N direct current generator, a described N direct current generator is connected in parallel, and wherein, N is more than or equal to 2 integer;

Be connected respectively to the IPM module of a described N direct current generator;

Export six road pwm signals to the main control module of described IPM module so that a described N direct current generator is controlled, described main control module is for applying DC current I to the d-axis of a described N direct current generator _dand obtain the maximum direct-axis voltage V of a described N direct current generator _dmaxwith minimum direct-axis voltage V _dmin, as described maximum direct-axis voltage V _dmaxwith described minimum direct-axis voltage V _dminratio while being greater than predetermined threshold value, judge that described N direct current generator in described direct current motor system exists motor phase failure situation.

7. direct current motor system according to claim 6, is characterized in that, described main control module moves to preset electric angle speed specifically for controlling a described N direct current generator, and in Preset Time, detects in real time the direct-axis voltage V of a described N direct current generator _d, to obtain the maximum direct-axis voltage V of a described N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.

8. direct current motor system according to claim 6, it is characterized in that, described main control module is exported the first to the 6th control signal specifically for controlling described IPM module successively to the three-phase of a described N direct current generator, and during to the 6th control signal, obtain respectively the direct-axis voltage V of a described N direct current generator in output described first _dto obtain the maximum direct-axis voltage V of a described N direct current generator _dmaxwith minimum direct-axis voltage V _dmin.

9. direct current motor system according to claim 8, it is characterized in that, the time of the time of the time of output the first control signal, the time of output the second control signal, output the 3rd control signal, the time of output the 4th control signal, the time of exporting the 5th control signal and output the 6th control signal equates and is 0.5-3 second.

10. according to the direct current motor system described in any one in claim 6-9, it is characterized in that, when a direct current generator in a described N direct current generator lacks 1 phase time, described predetermined threshold value is calculated according to following formula:

$X=R\max /R\min =\frac{3}{4*(N-1)}+1$

Wherein, X is described predetermined threshold value, the maximum load resistance in the Rmax pull-up resistor between mutually that is pull-up resistor between mutually of the U phase of a described N direct current generator and VW, V phase with UW and the pull-up resistor between W phase and UV phase, and minimum load resistance in the Rmin pull-up resistor between mutually that is pull-up resistor between mutually of the U phase of a described N direct current generator and VW, V phase with UW and the pull-up resistor between W phase and UV phase, and $R\min =\frac{\frac{3*R}{2*(N-1)}*2*R}{\frac{3*R}{2*(N-1)}+2*R},$ R is the phase resistance of each described direct current generator.