CN113466683B - Switch reluctance motor and fault detection method thereof and chef machine - Google Patents
Switch reluctance motor and fault detection method thereof and chef machine Download PDFInfo
- Publication number
- CN113466683B CN113466683B CN202110651137.3A CN202110651137A CN113466683B CN 113466683 B CN113466683 B CN 113466683B CN 202110651137 A CN202110651137 A CN 202110651137A CN 113466683 B CN113466683 B CN 113466683B
- Authority
- CN
- China
- Prior art keywords
- phase
- lower bridge
- current
- driving circuit
- bridge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 52
- 230000002159 abnormal effect Effects 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims description 33
- 238000004590 computer program Methods 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
The invention relates to a switch reluctance motor, a fault detection method thereof and a chef machine, which comprise the following steps: when the switch reluctance motor is started, the drive circuit of the switch reluctance motor is controlled to be conducted; acquiring the conduction current of a driving circuit; detecting whether the driving circuit is abnormal or not according to the on-current of the driving circuit. The invention can effectively detect whether the driving circuit is open or not, whether the phase is lost or not, whether the switching tube in the driving circuit is short-circuited or not, and the like, can avoid the controller of the switch reluctance motor from being damaged due to the phase loss or the short circuit, and effectively improve the reliability and the stability of the switch reluctance motor and the chef machine.
Description
Technical Field
The invention relates to the technical field of fault detection of a switched reluctance motor, in particular to a switched reluctance motor, a fault detection method thereof and a chef machine.
Background
Switched reluctance motors, such as four-phase switched reluctance motors, in principle require two MOS transistor controls per phase winding, while requiring two anti-parallel diodes. The MOS transistor and diode connected to the bus voltage VDC are upper bridges, and the MOS transistor and diode connected to the ground are lower bridges, and the circuit configuration shown in fig. 1 is generally adopted in view of cost and circuit configuration. As shown in fig. 1, the a-phase and the C-phase share the upper bridge MOS transistor Q1 and the diode D5, and the B-phase and the D-phase share the upper bridge MOS transistor Q5 and the diode D6, and the resistor R1 is a current detection resistor. Because of the driving characteristics of the switched reluctance motor, if the current detection R1 is short-circuited, or any one of the four phases of the A phase, the B phase, the C phase and the D phase or the multiphase phase is out of phase, the motor controller can be damaged.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art and provides a switch reluctance motor, a fault detection method thereof and a chef machine.
The technical scheme adopted for solving the technical problems is as follows: a fault detection method for constructing a switch reluctance motor comprises the following steps:
When the switch reluctance motor is started, controlling a driving circuit of the switch reluctance motor to be conducted;
Acquiring the conduction current of the driving circuit;
Detecting whether the driving circuit is abnormal according to the on current of the driving circuit.
In the fault detection method of a switched reluctance motor of the present invention, the controlling the conduction of the driving circuit of the switched reluctance motor includes:
When the switch reluctance motor is started, the driving circuit of the switch reluctance motor is controlled to be conducted and continuously conducted to a preset time period.
In the fault detection method of a switched reluctance motor of the present invention, the obtaining the on current of the driving circuit includes:
acquiring current of the driving circuit in a preset time period in real time in the preset time period when the driving circuit is continuously conducted;
After reaching a preset time period, controlling the driving circuit to be closed, and selecting the maximum current from the current of the driving current in the preset time period;
the maximum current is the on current.
In the fault detection method of a switched reluctance motor of the present invention, the detecting whether the driving circuit is abnormal according to the on current of the driving circuit includes:
Comparing the conduction current with a preset threshold value;
And if the conducting current is larger than a preset threshold value, judging that the driving circuit is not open.
In the fault detection method of a switched reluctance motor of the present invention, the detecting whether the driving circuit is abnormal according to the on current of the driving circuit further includes:
If the conduction current is smaller than the preset threshold value, controlling the driving circuit to conduct again;
after the drive circuit is turned on again, the continuous current of the drive circuit is obtained in real time;
judging whether the driving circuit is abnormal or not according to the continuous current of the driving circuit.
In the fault detection method of a switched reluctance motor of the present invention, the judging whether the driving circuit is abnormal according to the continuous current of the driving circuit includes:
Comparing the continuous current of the driving circuit with the preset threshold value;
And if the continuous current of the driving circuit is continuously smaller than the preset threshold value for a plurality of times, judging that the driving circuit is abnormal.
In the fault detection method of the switched reluctance motor of the invention,
The switched reluctance motor includes: a first phase, a second phase, a third phase, and a fourth phase;
the first phase and the second phase share an upper bridge, and the third phase and the fourth phase share an upper bridge.
In the fault detection method of the switched reluctance motor, the method further comprises the following steps:
if the drive circuit is not open, then:
detecting whether an upper bridge of the driving circuit is short-circuited;
the upper bridge of the driving circuit includes: an upper bridge common to the first phase and the second phase, and an upper bridge common to the third phase and the fourth phase.
In the fault detection method of a switched reluctance motor of the present invention, the detecting whether the upper bridge of the driving circuit is shorted includes:
Controlling closing of an upper bridge common to the first phase and the second phase, and controlling closing of an upper bridge common to the third phase and the fourth phase;
Controlling the conduction of the lower bridge of the first phase, the lower bridge of the second phase, the lower bridge of the third phase and the lower bridge of the fourth phase for a first duration;
Continuously detecting a lower bridge current during a period when the lower bridge of the first phase, the lower bridge of the second phase, the lower bridge of the third phase and the lower bridge of the fourth phase are continuously conducted;
judging whether the lower bridge current is smaller than a threshold value or not;
if yes, judging that the upper bridge of the driving circuit is normal;
if not, judging whether the lower bridge current is continuously larger than a threshold value for multiple times;
And if the lower bridge current is continuously and repeatedly larger than the threshold value, judging that the upper bridge of the driving circuit is short-circuited.
In the fault detection method of the switched reluctance motor, the method further comprises the following steps:
if the drive circuit is not open, then:
detecting whether a lower bridge of the driving circuit is short-circuited;
the lower bridge of the driving circuit includes: a lower bridge of the first phase, a lower bridge of the second phase, a lower bridge of the third phase, and a lower bridge of the fourth phase.
In the fault detection method of a switched reluctance motor of the present invention, the detecting whether the lower bridge of the driving circuit is shorted includes:
Controlling an upper bridge shared by the third phase and the fourth phase, a lower bridge of the first phase, a lower bridge of the second phase, a lower bridge of the third phase, and a lower bridge of the fourth phase to close;
controlling the upper bridge shared by the first phase and the second phase to be conducted for a second duration;
continuously detecting a lower bridge current during a period when an upper bridge shared by the first phase and the second phase is continuously conducted;
judging whether the lower bridge current is smaller than a threshold value or not;
if yes, judging that the lower bridge of the first phase and the lower bridge of the second phase are normal;
if not, judging whether the lower bridge current is continuously larger than a threshold value for multiple times;
And if the lower bridge current connection is more than a threshold value, judging that the lower bridge of the first phase and/or the lower bridge of the second phase are short-circuited.
In the fault detection method of the switched reluctance motor, the method further comprises the following steps:
Recording current values of the first phase and the second phase when an upper bridge shared by the first phase and the second phase is continuously conducted for the second time period; the current value is a first reference value.
In the fault detection method of a switched reluctance motor of the present invention, the detecting whether the lower bridge of the driving circuit is shorted further includes:
Controlling the upper bridge shared by the first phase and the second phase, the lower bridge of the first phase, the lower bridge of the second phase, the lower bridge of the third phase and the lower bridge of the fourth phase to be closed;
controlling the upper bridge shared by the third phase and the fourth phase to be conducted for a second duration;
continuously detecting a lower bridge current during a period in which an upper bridge shared by the third phase and the fourth phase is continuously conducted;
judging whether the lower bridge current is smaller than a threshold value or not;
If yes, judging that the lower bridge of the third phase and the lower bridge of the fourth phase are normal;
if not, judging whether the lower bridge current is continuously larger than a threshold value for multiple times;
and if the lower bridge current connection is more than a threshold value, judging that the lower bridge of the third phase and/or the lower bridge of the fourth phase is short-circuited.
In the fault detection method of the switched reluctance motor, the method further comprises the following steps:
recording current values of the third phase and the fourth phase when an upper bridge shared by the third phase and the fourth phase is continuously conducted for the second duration; the present current values of the third phase and the fourth phase are second reference values.
In the fault detection method of the switched reluctance motor, the method further comprises the following steps:
if the drive circuit is not open and not shorted, then:
and detecting whether the driving circuit lacks phase.
In the fault detection method of a switched reluctance motor of the present invention, the detecting whether the driving circuit lacks phase includes:
Controlling closing of a lower bridge of the second phase, a lower bridge of the third phase, a lower bridge of the fourth phase, and an upper bridge common to the third phase and the fourth phase;
Controlling the upper bridge shared by the first phase and the second phase and the lower bridge of the first phase to be conducted for a second duration;
Recording a current value of the first phase when an upper bridge shared by the first phase and the second phase and a lower bridge of the first phase are continuously conducted to the second time period;
And judging whether the first phase is out of phase or not according to the current value of the first phase and the first reference value.
In the fault detection method of a switched reluctance motor of the present invention, the determining whether the first phase is out of phase according to the current value of the first phase and the first reference value includes:
the current value of the first phase is differenced with the first reference value to obtain a first difference value;
Judging whether the first difference value is larger than a reference value or not;
If yes, judging that the first phase is not in phase shortage;
if not, continuously acquiring the first difference value, and judging whether the first difference value is continuously smaller than the reference value for multiple times;
And if the first difference value is continuously smaller than the reference value for a plurality of times, judging that the first phase is out of phase.
In the fault detection method of a switched reluctance motor of the present invention, the detecting whether the driving circuit lacks phase further includes:
controlling the lower bridge of the first phase, the lower bridge of the third phase, the lower bridge of the fourth phase, and the upper bridge shared by the third phase and the fourth phase to be closed;
controlling the upper bridge shared by the first phase and the second phase and the lower bridge of the second phase to be conducted for a second duration;
Recording the current value of the second phase when the upper bridge shared by the first phase and the second phase and the lower bridge of the second phase are continuously conducted to the second time period;
And judging whether the second phase is out of phase or not according to the current value of the second phase and the first reference value.
In the fault detection method of a switched reluctance motor of the present invention, the determining whether the second phase is out of phase according to the current value of the second phase and the first reference value includes:
the current value of the second phase is differenced with the first reference value to obtain a second difference value;
judging whether the second difference value is larger than a reference value or not;
if yes, judging that the second phase is not in phase shortage;
if not, continuing to acquire the second difference value, and judging whether the second difference value is continuously smaller than the reference value for multiple times;
and if the second difference value is continuously smaller than the reference value for a plurality of times, judging that the second phase is out of phase.
In the fault detection method of a switched reluctance motor of the present invention, the detecting whether the driving circuit lacks phase further includes:
Controlling the upper bridge shared by the first phase and the second phase, the lower bridge of the first phase, the lower bridge of the second phase and the lower bridge of the fourth phase to be closed;
controlling the upper bridge shared by the third phase and the fourth phase and the lower bridge of the third phase to be conducted for a second duration;
recording a current value of the third phase when the upper bridge shared by the third phase and the fourth phase and the lower bridge of the third phase are continuously conducted to the second duration;
and judging whether the third phase is out of phase or not according to the current value of the third phase and the second reference value.
In the fault detection method of a switched reluctance motor of the present invention, the determining whether the third phase is phase-missing according to the current value of the third phase and the second reference value includes:
the current value of the third phase is differenced with the second reference value to obtain a third difference value;
judging whether the third difference value is larger than a reference value or not;
if yes, judging that the third phase is not in phase shortage;
if not, continuously acquiring the third difference value, and judging whether the third difference value is continuously smaller than the reference value for multiple times;
and if the third difference value is continuously smaller than the reference value for a plurality of times, judging that the third phase is out of phase.
In the fault detection method of a switched reluctance motor of the present invention, the detecting whether the driving circuit lacks phase further includes:
Controlling an upper bridge shared by the first phase and the second phase, a lower bridge of the first phase, a lower bridge of the second phase and a lower bridge of the third phase to be closed;
controlling the upper bridge shared by the third phase and the fourth phase and the lower bridge of the fourth phase to be conducted for a second duration;
Recording a current value of the fourth phase when the upper bridge shared by the third phase and the fourth phase and the lower bridge of the fourth phase are continuously conducted to the second duration;
and judging whether the fourth phase is out of phase or not according to the current value of the fourth phase and the second reference value.
In the fault detection method of a switched reluctance motor of the present invention, the determining whether the fourth phase is open-phase according to the current value of the fourth phase and the second reference value includes:
The current value of the fourth phase is differenced with the second reference value to obtain a fourth difference value;
judging whether the fourth difference value is larger than a reference value or not;
If yes, judging that the fourth phase is not in a phase shortage state;
if not, continuously acquiring the fourth difference value, and judging whether the fourth difference value is continuously smaller than the reference value for multiple times;
and if the fourth difference value is continuously smaller than the reference value for a plurality of times, judging that the fourth phase is out of phase.
The invention also provides a switch reluctance motor, which comprises a memory and a processor;
the memory is used for storing a computer program;
the processor is configured to execute a computer program stored in the memory to implement the method for fault detection of a switched reluctance motor as described above.
The invention also provides a chef machine comprising the switch reluctance motor.
The switch reluctance motor, the fault detection method thereof and the chef machine have the following beneficial effects: the method comprises the following steps: when the switch reluctance motor is started, the drive circuit of the switch reluctance motor is controlled to be conducted; acquiring the conduction current of a driving circuit; detecting whether the driving circuit is abnormal or not according to the on-current of the driving circuit. The invention can effectively detect whether the drive circuit is in a phase failure state, whether the switching tube in the drive circuit is in a short circuit state or not, and the like, can avoid the controller of the switch reluctance motor from being damaged due to the phase failure or the short circuit state, and effectively improve the reliability and the stability of the switch reluctance motor and a chef machine.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic circuit diagram of a four-phase switched reluctance motor provided by an embodiment of the present invention;
Fig. 2 is a flow chart of a fault detection method of a switched reluctance motor according to an embodiment of the present invention.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
Referring to fig. 2, a flow chart of an alternative embodiment of a fault detection method for a switched reluctance motor according to the present invention is shown.
The fault detection method of the switch reluctance motor can be applied to the four-phase switch reluctance motor with the structure shown in fig. 1. Of course, it is understood that the fault detection method of the switched reluctance motor can also be applied to a six-phase, eight-equal switched reluctance motor having the same structure as the upper and lower bridges of fig. 1.
Specifically, as shown in fig. 2, the fault detection method of the switched reluctance motor includes the following steps:
step S101, when the switch reluctance motor is started, a driving circuit of the switch reluctance motor is controlled to be conducted.
In some embodiments, controlling the drive circuit of the switched reluctance motor to conduct includes: when the switch reluctance motor is started, the driving circuit of the switch reluctance motor is controlled to be conducted and continuously conducted to a preset time period.
Alternatively, the preset time period may be 200us. Of course, the preset time period can be adjusted according to the actual product, so that the current flowing through fig. 1 is large enough to be detected and the motor is required to be guaranteed to have a non-started rotating speed.
Step S102, obtaining the on-state current of the driving circuit.
In some embodiments, obtaining the on-current of the driving circuit includes: in a preset time period when the driving circuit is continuously conducted, acquiring current of the driving circuit in the preset time period in real time; after reaching the preset time period, controlling the driving circuit to be closed, and selecting the maximum current from the current of the driving current in the preset time period; the maximum current is the on current.
Further, after reaching the preset time period, the control driving circuit is turned off for a certain period of time, for example, may be 3ms. Of course, the time can be adjusted appropriately, and it is only necessary to satisfy the condition that the current is freewheeled to zero. As shown in fig. 1, the driving circuit may be turned off and on by controlling six MOS transistors (i.e., Q1, Q2, Q3, Q4, Q5, and Q6) in fig. 1. Specifically, the driving circuit is turned on when Q1, Q2, Q3, Q4, Q5, and Q6 are all on, and turned off when Q1, Q2, Q3, Q4, Q5, and Q6 are all off.
Step S103, detecting whether the driving circuit is abnormal or not according to the on-current of the driving circuit.
In some embodiments, detecting whether the driving circuit is abnormal according to the on-current of the driving circuit includes: comparing the conduction current with a preset threshold value; if the on current is larger than the preset threshold value, judging that the driving circuit is not open.
It will be appreciated that when the on-current is greater than the preset threshold, it is indicated that the drive circuit of the switched reluctance motor is not open.
Further, in some embodiments, detecting whether the driving circuit is abnormal according to the on-current of the driving circuit further includes: if the conduction current is smaller than the preset threshold value, the driving circuit is controlled to be conducted again; after the drive circuit is turned on again, the continuous current of the drive circuit is obtained in real time; judging whether the driving circuit is abnormal or not according to the continuous current of the driving circuit.
Wherein, judge whether drive circuit is unusual according to drive circuit's continuous current includes: comparing the continuous current of the driving circuit with a preset threshold value; if the continuous current of the driving circuit is continuously smaller than the preset threshold value for a plurality of times, judging that the driving circuit is abnormal. It can be understood that the continuous current is an on current obtained after repeating the steps S101 and S102, and if the on currents detected continuously and repeatedly are smaller than the preset threshold, it may be determined that the current detection resistor or the current detection circuit and/or the driving circuit is abnormal. The number of times may be 3,4, 5, or the like, as long as the stability determination is satisfied, thereby improving the stability and reliability of the failure detection.
The switched reluctance motor includes: a first phase, a second phase, a third phase, and a fourth phase. The first phase and the second phase share an upper bridge, and the third phase and the fourth phase share an upper bridge. Wherein, as shown in fig. 1, the first phase is: phase a, second phase: and C phase, the third phase is: a phase B; the fourth phase is: and D phase. The A phase and the C phase share an upper bridge (Q1), and the B phase and the D phase share an upper bridge (Q5). Q3 is the lower bridge of the A phase, Q4 is the lower bridge of the C phase, Q6 is the lower bridge of the B phase, and Q2 is the lower bridge of the D phase. R1 is a current sensing resistor.
Further, in some embodiments, the fault detection method of the switched reluctance motor further includes: if the drive circuit is not open, then: detecting whether an upper bridge of the driving circuit is short-circuited; the upper bridge of the driving circuit includes: an upper bridge common to the first phase and the second phase, and an upper bridge common to the third phase and the fourth phase.
Wherein detecting whether the upper bridge of the driving circuit is shorted includes: controlling the upper bridge shared by the first phase and the second phase to be closed, and controlling the upper bridge shared by the third phase and the fourth phase to be closed; controlling the conduction of the lower bridge of the first phase, the lower bridge of the second phase, the lower bridge of the third phase and the lower bridge of the fourth phase, and continuing for a first duration; continuously detecting a lower bridge current during the continuous conduction period of the lower bridge of the first phase, the lower bridge of the second phase, the lower bridge of the third phase and the lower bridge of the fourth phase; judging whether the lower bridge current is smaller than a threshold value or not; if yes, judging that the upper bridge of the driving circuit is normal; if not, judging whether the lower bridge current is continuously larger than the threshold value for multiple times; and if the lower bridge current is continuously and repeatedly larger than the threshold value, judging that the upper bridge of the driving circuit is short-circuited. It will be appreciated that the current flowing through the sense resistor is when the lower bridge currents at this time are all on for Q3, Q4, Q6 and Q2, and are all off for Q1 and Q5.
Alternatively, the first duration may be 1ms.
It can be understood that when the lower bridge current is detected to be greater than the threshold value for the first time, the above steps are repeated to obtain the lower bridge current, and whether the lower bridge current obtained repeatedly is greater than the threshold value is judged, and if the lower bridge current detected continuously for many times is greater than the threshold value, the upper bridge short circuit can be judged.
Further, in some embodiments, the fault detection method of the switched reluctance motor further includes: if the drive circuit is not open, then: detecting whether a lower bridge of the driving circuit is short-circuited; the lower bridge of the driving circuit includes: a lower bridge of the first phase, a lower bridge of the second phase, a lower bridge of the third phase, and a lower bridge of the fourth phase.
Wherein detecting whether the lower bridge of the driving circuit is shorted includes: controlling the upper bridge shared by the third phase and the fourth phase, the lower bridge of the first phase, the lower bridge of the second phase, the lower bridge of the third phase and the lower bridge of the fourth phase to be closed; controlling the upper bridge shared by the first phase and the second phase to be conducted for a second duration; continuously detecting a lower bridge current during a period that an upper bridge shared by the first phase and the second phase is continuously conducted; judging whether the lower bridge current is smaller than a threshold value or not; if yes, judging that the lower bridge of the first phase and the lower bridge of the second phase are normal; if not, judging whether the lower bridge current is continuously larger than the threshold value for multiple times; and if the current connection of the lower bridge is more than the threshold value, judging that the lower bridge of the first phase and/or the lower bridge of the second phase are short-circuited.
In this embodiment, the lower bridge current is: when Q1 is on, Q3 is off, Q4 is off, Q5 is off, Q6 is off, and Q2 is off, current flows through the current sensing resistor. I.e. the embodiment can determine if the lower bridges of the a-phase and the C-phase are shorted.
Alternatively, the second duration may be 200us.
In this embodiment, when the lower bridge currents of the a phase and the C phase are detected to be greater than the threshold value for the first time, the above steps are repeated to obtain the lower bridge currents of the a phase and the C phase, and whether the lower bridge currents of the a phase and the C phase are both greater than the threshold value is determined, and if the lower bridge currents detected continuously for multiple times are both greater than the threshold value, the lower bridge short circuit can be determined. Alternatively, 3 times, 4 times, 5 times, etc. may be successively judged.
Further, in this embodiment, the current values of the first phase and the second phase are recorded while the upper bridge common to the first phase and the second phase is continuously turned on for the second period of time. The present current value is a first reference value.
Further, in some embodiments, detecting whether the lower bridge of the driving circuit is shorted further includes: controlling the upper bridge shared by the first phase and the second phase, the lower bridge of the first phase, the lower bridge of the second phase, the lower bridge of the third phase and the lower bridge of the fourth phase to be closed; controlling the upper bridge shared by the third phase and the fourth phase to be conducted for a second duration; continuously detecting a lower bridge current during the period that the upper bridge shared by the third phase and the fourth phase is continuously conducted; judging whether the lower bridge current is smaller than a threshold value or not; if yes, judging that the lower bridge of the third phase and the lower bridge of the fourth phase are normal; if not, judging whether the lower bridge current is continuously larger than the threshold value for multiple times; and if the current connection of the lower bridge is more than the threshold value, judging that the lower bridge of the third phase and/or the lower bridge of the fourth phase is short-circuited.
In this embodiment, the lower bridge current is: when Q5 is on, Q6 is off, Q2 is off, Q1 is off, Q3 is off, and Q4 is off, current flows through the current sensing resistor. I.e. the embodiment can determine if the lower bridges of the B-phase and D-phase are shorted.
Alternatively, the second duration may be 200us.
In this embodiment, when the lower bridge currents of the B phase and the D phase are detected to be greater than the threshold value for the first time, the above steps are repeated to obtain the lower bridge currents of the B phase and the D phase, and whether the lower bridge currents of the B phase and the D phase are both greater than the threshold value is determined, and if the lower bridge currents detected continuously for multiple times are both greater than the threshold value, the lower bridge short circuit can be determined. Alternatively, 3 times, 4 times, 5 times, etc. may be successively judged.
Further, in this embodiment, when the upper bridge shared by the third phase and the fourth phase is continuously turned on for the second period of time, the current values of the third phase and the fourth phase are recorded; the present current values of the third phase and the fourth phase are the second reference value.
Further, in some embodiments, the fault detection method of the switched reluctance motor further includes: if the drive circuit is not open and not shorted, then: and detecting whether the driving circuit is out of phase.
In some embodiments, detecting whether the drive circuit is open-phase comprises: controlling the lower bridge of the second phase, the lower bridge of the third phase, the lower bridge of the fourth phase and the upper bridge shared by the third phase and the fourth phase to be closed; controlling the upper bridge shared by the first phase and the second phase, and the lower bridge of the first phase to be conducted for a second duration; recording the current value of the first phase when the upper bridge shared by the first phase and the second phase and the lower bridge of the first phase are continuously conducted for a second time period; and judging whether the first phase is out of phase or not according to the current value of the first phase and the first reference value.
Wherein determining whether the first phase is open-phase based on the current value of the first phase and the first reference value comprises: the current value of the first phase is differenced with a first reference value to obtain a first difference value; judging whether the first difference value is larger than a reference value or not; if yes, judging that the first phase is not in phase shortage; if not, continuously acquiring the first difference value, and judging whether the first difference value is continuously smaller than the reference value for a plurality of times; if the first difference value is continuously smaller than the reference value for a plurality of times, judging the first phase failure.
In this embodiment, the current value of the first phase is: when Q1 is on and Q3 is on, Q4 is off, Q5 is off, Q6 is off, and Q2 is off, a current flows through the current sensing resistor.
Alternatively, in this embodiment, whether the a phase is out of phase may be determined by the above method. When the first difference value is determined to be smaller than the reference value for the first time, in order to ensure the stability and reliability of the determination result, the first difference value may be repeatedly obtained, and compared with the reference value, and if the first difference value is continuously smaller than the reference value for multiple times, the C-phase open-phase may be determined. Wherein 3,4, 5, etc. times may be consecutive.
In some embodiments, detecting whether the drive circuit is open-phase further comprises: controlling the lower bridge of the first phase, the lower bridge of the third phase, the lower bridge of the fourth phase and the upper bridge shared by the third phase and the fourth phase to be closed; controlling the upper bridge shared by the first phase and the second phase and the lower bridge of the second phase to be conducted for a second duration; recording the current value of the second phase when the upper bridge shared by the first phase and the second phase and the lower bridge of the second phase are continuously conducted for a second time period;
and judging whether the second phase is out of phase or not according to the current value of the second phase and the first reference value.
Judging whether the second phase is out of phase according to the current value of the second phase and the first reference value comprises the following steps: the current value of the second phase is differenced with the first reference value to obtain a second difference value; judging whether the second difference value is larger than a reference value or not; if yes, judging that the second phase is not in phase shortage; if not, continuously acquiring a second difference value, and judging whether the second difference value is continuously smaller than the reference value for multiple times; if the second difference value is continuously smaller than the reference value for a plurality of times, judging that the second phase is out of phase.
In this embodiment, the second phase current has a value of: when Q1 is on and Q4 is on, Q3 is off, Q5 is off, Q6 is off, and Q2 is off, a current flows through the current sensing resistor.
Alternatively, in this embodiment, whether the C phase is out of phase may be determined by the above method. When the second difference value is smaller than the reference value in the first determination, in order to ensure the stability and reliability of the determination result, the second difference value may be repeatedly obtained, and compared with the reference value, and if the second difference value is continuously smaller than the reference value multiple times, the phase loss of the phase a may be determined. Wherein 3,4, 5, etc. times may be consecutive.
In some embodiments, detecting whether the drive circuit is open-phase further comprises: controlling the upper bridge shared by the first phase and the second phase, the lower bridge of the first phase, the lower bridge of the second phase and the lower bridge of the fourth phase to be closed; controlling the upper bridge shared by the third phase and the fourth phase and the lower bridge of the third phase to be conducted for a second duration; recording a current value of the third phase when the upper bridge shared by the third phase and the fourth phase and the lower bridge of the third phase are continuously conducted for a second duration; and judging whether the third phase is out of phase or not according to the current value of the third phase and the second reference value.
Wherein determining whether the third phase is open-phase according to the current value of the third phase and the second reference value includes: the current value of the third phase is differenced with the second reference value to obtain a third difference value; judging whether the third difference value is larger than a reference value; if yes, judging that the third phase is not in phase shortage; if not, continuously acquiring a third difference value, and judging whether the third difference value is continuously smaller than the reference value for multiple times; if the third difference value is continuously smaller than the reference value for a plurality of times, judging that the third phase is out of phase.
In this embodiment, the current value of the third phase is: when Q5 is on and Q6 is on, Q2 is off, Q1 is off, Q3 is off, and Q4 is off, a current flows through the current sensing resistor.
Alternatively, in this embodiment, whether the B phase is out of phase may be determined by the above method. When the third difference value is smaller than the reference value in the first determination, in order to ensure the stability and reliability of the determination result, the third difference value may be repeatedly obtained, and compared with the reference value, and if the third difference value is continuously smaller than the reference value multiple times, the B-phase open-phase may be determined. Wherein 3,4, 5, etc. times may be consecutive.
In some embodiments, detecting whether the drive circuit is open-phase further comprises: controlling the upper bridge shared by the first phase and the second phase, the lower bridge of the first phase, the lower bridge of the second phase and the lower bridge of the third phase to be closed; controlling the upper bridge shared by the third phase and the fourth phase and the lower bridge of the fourth phase to be conducted for a second duration; recording a current value of the fourth phase when the upper bridge shared by the third phase and the fourth phase and the lower bridge of the fourth phase are continuously conducted for a second time period; and judging whether the fourth phase is out of phase or not according to the current value of the fourth phase and the second reference value.
Wherein determining whether the fourth phase is open-phase based on the current value of the fourth phase and the second reference value includes: the current value of the fourth phase is differenced with the second reference value to obtain a fourth difference value; judging whether the fourth difference value is larger than a reference value; if yes, judging that the fourth phase is not in phase failure; if not, continuously acquiring a fourth difference value, and judging whether the fourth difference value is continuously smaller than the reference value for multiple times; if the fourth difference value is continuously smaller than the reference value for a plurality of times, judging the fourth phase failure.
In this embodiment, the current value of the fourth phase is: when Q5 is on and Q6Q2 is on, Q6 is off, Q1 is off, Q3 is off, and Q4 is off, current flows through the current sensing resistor.
Alternatively, in this embodiment, whether the D phase is out of phase may be determined by the method described above. When the fourth difference value is determined to be smaller than the reference value for the first time, in order to ensure the stability and reliability of the determination result, the fourth difference value may be repeatedly obtained, and compared with the reference value, and if the fourth difference value is continuously smaller than the reference value for multiple times, the D-phase loss may be determined. Wherein 3,4, 5, etc. times may be consecutive.
Further, the present invention also provides a switched reluctance motor, which may include a memory and a processor; the memory is used for storing a computer program; the processor is used for executing the computer program stored in the memory to realize the fault detection method of the switch reluctance motor disclosed by the embodiment of the invention.
Furthermore, the invention also provides a chef machine which comprises the switched reluctance motor disclosed by the embodiment of the invention.
The switch reluctance motor and the chef machine can effectively detect faults such as short circuit of the current detection resistor, faults of the current detection circuit, phase failure, short circuit of the MOS tube and the like by adopting the fault detection method of the switch reluctance motor disclosed by the embodiment of the invention, so that the motor controller is prevented from being damaged by the faults, the reliability, the stability and the safety of products are improved, and the competitiveness of the products is improved.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same according to the content of the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made with the scope of the claims should be covered by the claims.
Claims (23)
1. The fault detection method of the switched reluctance motor is characterized by comprising the following steps of:
When the switch reluctance motor is started, controlling a driving circuit of the switch reluctance motor to be conducted;
Acquiring the conduction current of the driving circuit;
Detecting whether the driving circuit is abnormal according to the conduction current of the driving circuit; the detecting whether the driving circuit is abnormal according to the on-current of the driving circuit includes: comparing the conduction current with a preset threshold value; if the on current is larger than a preset threshold value, judging that the driving circuit is not open;
the method further comprises the steps of: if the drive circuit is not open, then: detecting whether an upper bridge of the driving circuit is short-circuited and/or detecting whether a lower bridge of the driving circuit is short-circuited;
If the drive circuit is not open and not shorted, then: and detecting whether the driving circuit lacks phase.
2. The method of claim 1, wherein controlling the conduction of the drive circuit of the switched reluctance motor comprises:
When the switch reluctance motor is started, the driving circuit of the switch reluctance motor is controlled to be conducted and continuously conducted to a preset time period.
3. The method of claim 2, wherein the obtaining the on-current of the driving circuit comprises:
acquiring current of the driving circuit in a preset time period in real time in the preset time period when the driving circuit is continuously conducted;
after a preset time period is reached, the driving circuit is controlled to be closed, and the maximum current is selected from the current of the driving circuit in the preset time period;
the maximum current is the on current.
4. The fault detection method of a switched reluctance motor according to claim 1, wherein the detecting whether the driving circuit is abnormal according to an on-current of the driving circuit further comprises:
If the conduction current is smaller than the preset threshold value, controlling the driving circuit to conduct again;
after the drive circuit is turned on again, the continuous current of the drive circuit is obtained in real time;
judging whether the driving circuit is abnormal or not according to the continuous current of the driving circuit.
5. The fault detection method of a switched reluctance motor according to claim 4, wherein the judging whether the driving circuit is abnormal according to the continuous current of the driving circuit comprises:
Comparing the continuous current of the driving circuit with the preset threshold value;
And if the continuous current of the driving circuit is continuously smaller than the preset threshold value for a plurality of times, judging that the driving circuit is abnormal.
6. The method for detecting a failure of a switched reluctance motor according to claim 1, wherein,
The switched reluctance motor includes: a first phase, a second phase, a third phase, and a fourth phase;
the first phase and the second phase share an upper bridge, and the third phase and the fourth phase share an upper bridge.
7. The method for detecting a failure of a switched reluctance motor according to claim 6, wherein,
The upper bridge of the driving circuit includes: an upper bridge common to the first phase and the second phase, and an upper bridge common to the third phase and the fourth phase.
8. The method of claim 7, wherein detecting whether the upper bridge of the driving circuit is shorted comprises:
Controlling closing of an upper bridge common to the first phase and the second phase, and controlling closing of an upper bridge common to the third phase and the fourth phase;
Controlling the conduction of the lower bridge of the first phase, the lower bridge of the second phase, the lower bridge of the third phase and the lower bridge of the fourth phase for a first duration;
Continuously detecting a lower bridge current during a period when the lower bridge of the first phase, the lower bridge of the second phase, the lower bridge of the third phase and the lower bridge of the fourth phase are continuously conducted;
judging whether the lower bridge current is smaller than a threshold value or not;
if yes, judging that the upper bridge of the driving circuit is normal;
if not, judging whether the lower bridge current is continuously larger than a threshold value for multiple times;
And if the lower bridge current is continuously and repeatedly larger than the threshold value, judging that the upper bridge of the driving circuit is short-circuited.
9. The method for detecting a failure of a switched reluctance motor according to claim 7,
The lower bridge of the driving circuit includes: a lower bridge of the first phase, a lower bridge of the second phase, a lower bridge of the third phase, and a lower bridge of the fourth phase.
10. The method of claim 9, wherein detecting whether the lower bridge of the driving circuit is shorted comprises:
Controlling an upper bridge shared by the third phase and the fourth phase, a lower bridge of the first phase, a lower bridge of the second phase, a lower bridge of the third phase, and a lower bridge of the fourth phase to close;
controlling the upper bridge shared by the first phase and the second phase to be conducted for a second duration;
continuously detecting a lower bridge current during a period when an upper bridge shared by the first phase and the second phase is continuously conducted;
judging whether the lower bridge current is smaller than a threshold value or not;
if yes, judging that the lower bridge of the first phase and the lower bridge of the second phase are normal;
if not, judging whether the lower bridge current is continuously larger than a threshold value for multiple times;
And if the lower bridge current connection is more than a threshold value, judging that the lower bridge of the first phase and/or the lower bridge of the second phase are short-circuited.
11. The method of claim 10, further comprising:
Recording current values of the first phase and the second phase when an upper bridge shared by the first phase and the second phase is continuously conducted for the second time period; the current value is a first reference value.
12. The method of claim 11, wherein detecting whether the lower bridge of the driving circuit is shorted further comprises:
Controlling the upper bridge shared by the first phase and the second phase, the lower bridge of the first phase, the lower bridge of the second phase, the lower bridge of the third phase and the lower bridge of the fourth phase to be closed;
controlling the upper bridge shared by the third phase and the fourth phase to be conducted for a second duration;
continuously detecting a lower bridge current during a period in which an upper bridge shared by the third phase and the fourth phase is continuously conducted;
judging whether the lower bridge current is smaller than a threshold value or not;
If yes, judging that the lower bridge of the third phase and the lower bridge of the fourth phase are normal;
if not, judging whether the lower bridge current is continuously larger than a threshold value for multiple times;
and if the lower bridge current connection is more than a threshold value, judging that the lower bridge of the third phase and/or the lower bridge of the fourth phase is short-circuited.
13. The method of claim 12, further comprising:
recording current values of the third phase and the fourth phase when an upper bridge shared by the third phase and the fourth phase is continuously conducted for the second duration; the present current values of the third phase and the fourth phase are second reference values.
14. The method of claim 13, wherein detecting whether the drive circuit is open-phase comprises:
Controlling closing of a lower bridge of the second phase, a lower bridge of the third phase, a lower bridge of the fourth phase, and an upper bridge common to the third phase and the fourth phase;
Controlling the upper bridge shared by the first phase and the second phase and the lower bridge of the first phase to be conducted for a second duration;
Recording a current value of the first phase when an upper bridge shared by the first phase and the second phase and a lower bridge of the first phase are continuously conducted to the second time period;
And judging whether the first phase is out of phase or not according to the current value of the first phase and the first reference value.
15. The method of claim 14, wherein the determining whether the first phase is open based on the current value of the first phase and the first reference value comprises:
the current value of the first phase is differenced with the first reference value to obtain a first difference value;
Judging whether the first difference value is larger than a reference value or not;
If yes, judging that the first phase is not in phase shortage;
if not, continuously acquiring the first difference value, and judging whether the first difference value is continuously smaller than the reference value for multiple times;
And if the first difference value is continuously smaller than the reference value for a plurality of times, judging that the first phase is out of phase.
16. The method of claim 13, wherein detecting whether the drive circuit is open-phase further comprises:
controlling the lower bridge of the first phase, the lower bridge of the third phase, the lower bridge of the fourth phase, and the upper bridge shared by the third phase and the fourth phase to be closed;
controlling the upper bridge shared by the first phase and the second phase and the lower bridge of the second phase to be conducted for a second duration;
Recording the current value of the second phase when the upper bridge shared by the first phase and the second phase and the lower bridge of the second phase are continuously conducted to the second time period;
And judging whether the second phase is out of phase or not according to the current value of the second phase and the first reference value.
17. The method of claim 16, wherein determining whether the second phase is open based on the current value of the second phase and the first reference value comprises:
the current value of the second phase is differenced with the first reference value to obtain a second difference value;
judging whether the second difference value is larger than a reference value or not;
if yes, judging that the second phase is not in phase shortage;
if not, continuing to acquire the second difference value, and judging whether the second difference value is continuously smaller than the reference value for multiple times;
and if the second difference value is continuously smaller than the reference value for a plurality of times, judging that the second phase is out of phase.
18. The method of claim 13, wherein detecting whether the drive circuit is open-phase further comprises:
Controlling the upper bridge shared by the first phase and the second phase, the lower bridge of the first phase, the lower bridge of the second phase and the lower bridge of the fourth phase to be closed;
controlling the upper bridge shared by the third phase and the fourth phase and the lower bridge of the third phase to be conducted for a second duration;
recording a current value of the third phase when the upper bridge shared by the third phase and the fourth phase and the lower bridge of the third phase are continuously conducted to the second duration;
and judging whether the third phase is out of phase or not according to the current value of the third phase and the second reference value.
19. The method of claim 18, wherein the determining whether the third phase is open-phase based on the current value of the third phase and the second reference value comprises:
the current value of the third phase is differenced with the second reference value to obtain a third difference value;
judging whether the third difference value is larger than a reference value or not;
if yes, judging that the third phase is not in phase shortage;
if not, continuously acquiring the third difference value, and judging whether the third difference value is continuously smaller than the reference value for multiple times;
and if the third difference value is continuously smaller than the reference value for a plurality of times, judging that the third phase is out of phase.
20. The method of claim 13, wherein detecting whether the drive circuit is open-phase further comprises:
Controlling an upper bridge shared by the first phase and the second phase, a lower bridge of the first phase, a lower bridge of the second phase and a lower bridge of the third phase to be closed;
controlling the upper bridge shared by the third phase and the fourth phase and the lower bridge of the fourth phase to be conducted for a second duration;
Recording a current value of the fourth phase when the upper bridge shared by the third phase and the fourth phase and the lower bridge of the fourth phase are continuously conducted to the second duration;
and judging whether the fourth phase is out of phase or not according to the current value of the fourth phase and the second reference value.
21. The method of claim 20, wherein the determining whether the fourth phase is open based on the current value of the fourth phase and the second reference value comprises:
The current value of the fourth phase is differenced with the second reference value to obtain a fourth difference value;
judging whether the fourth difference value is larger than a reference value or not;
If yes, judging that the fourth phase is not in a phase shortage state;
if not, continuously acquiring the fourth difference value, and judging whether the fourth difference value is continuously smaller than the reference value for multiple times;
and if the fourth difference value is continuously smaller than the reference value for a plurality of times, judging that the fourth phase is out of phase.
22. A switched reluctance motor comprising a memory and a processor;
the memory is used for storing a computer program;
The processor is configured to execute a computer program stored in the memory to implement the fault detection method of a switched reluctance motor as claimed in any one of claims 1 to 21.
23. A chef machine comprising the switched reluctance motor of claim 22.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110651137.3A CN113466683B (en) | 2021-06-10 | Switch reluctance motor and fault detection method thereof and chef machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110651137.3A CN113466683B (en) | 2021-06-10 | Switch reluctance motor and fault detection method thereof and chef machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113466683A CN113466683A (en) | 2021-10-01 |
| CN113466683B true CN113466683B (en) | 2024-07-02 |
Family
ID=
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666858A (en) * | 2009-09-09 | 2010-03-10 | 中国矿业大学 | Switch reluctance motor double master switch power converter master switch fault diagnosis method |
| CN105572586A (en) * | 2015-11-09 | 2016-05-11 | 上海凌翼动力科技有限公司 | Phase-precise-timing three-phase AC motor high-voltage safety dynamic simulation system |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666858A (en) * | 2009-09-09 | 2010-03-10 | 中国矿业大学 | Switch reluctance motor double master switch power converter master switch fault diagnosis method |
| CN105572586A (en) * | 2015-11-09 | 2016-05-11 | 上海凌翼动力科技有限公司 | Phase-precise-timing three-phase AC motor high-voltage safety dynamic simulation system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5142917B2 (en) | Multi-phase motor drive device | |
| KR101698302B1 (en) | Motor control device and motor control method | |
| JP5436592B2 (en) | Motor control device, current control method applied to motor control device, and electric power steering device using motor control device | |
| CN103151976B (en) | Control system for multiphase electric rotating machine | |
| TWI544225B (en) | Motor control system with electrical insulation deterioration detecting device and method of detecting electrical insulation deterioration of motor | |
| JP5157372B2 (en) | Multi-phase rotating electrical machine control device and multi-phase rotating electrical machine device | |
| CN101499773B (en) | Motor control system including electrical insulation deterioration detecting system | |
| JP5057661B2 (en) | Electric motor drive system | |
| US10601357B2 (en) | Method for emulating a three-phase electric motor using a load emulator, and a corresponding load emulator | |
| CN101960712A (en) | Inverter device | |
| CN102893524A (en) | Short-circuit protection method | |
| CN113466683B (en) | Switch reluctance motor and fault detection method thereof and chef machine | |
| US11201579B2 (en) | Method of diagnosing a fault in a motor circuit | |
| CN111366844B (en) | Vehicle, motor drive control system, and method and device for detecting phase failure of motor | |
| JP5401965B2 (en) | PWM inverter output current detection method | |
| US6882121B2 (en) | Control device | |
| CN113466683A (en) | Switched reluctance motor, fault detection method thereof and cook machine | |
| JP3514229B2 (en) | Inverter circuit failure detection method | |
| CN101207350B (en) | Operation of an electrical drive system | |
| KR102661750B1 (en) | Machine learning method for diagnosing fault of inverter and inverter for diagnosing fault through learning data | |
| JPH06233402A (en) | Drive control circuit for electric vehicle | |
| US4937530A (en) | Apparatus for monitoring phase voltages of a polyphase tachometer generator to detect phase failures | |
| JP2001086785A (en) | Motor control method and motor control apparatus | |
| CN113740622B (en) | Electric tool, direct-current brushless motor and phase failure detection method thereof | |
| JPH1023783A (en) | Dc brushless motor drive method and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |