CN110808697A - Method for operating a brushless DC motor - Google Patents
Method for operating a brushless DC motor Download PDFInfo
- Publication number
- CN110808697A CN110808697A CN201910712213.XA CN201910712213A CN110808697A CN 110808697 A CN110808697 A CN 110808697A CN 201910712213 A CN201910712213 A CN 201910712213A CN 110808697 A CN110808697 A CN 110808697A
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- Prior art keywords
- motor
- brushless
- mot
- value
- current
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000003111 delayed effect Effects 0.000 claims abstract description 9
- 238000004590 computer program Methods 0.000 claims description 9
- 230000010355 oscillation Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/08—Arrangements for controlling the speed or torque of a single motor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention relates to a method for operating a brushless DC motor, wherein an electrical variable of the brushless DC motor is determined when a change in the speed of the brushless DC motor is required, and the execution (35) of the request (30) is delayed until the value (I) of the electrical variableMot) And/or gradient (dI)Mot) Is located within a preset range.
Description
Technical Field
The invention relates to a method for operating a brushless direct current motor. Furthermore, the invention relates to a computer program for carrying out each step of the method and to a machine-readable storage medium on which the computer program is stored. Finally, the invention also relates to an electronic control unit provided for carrying out the method.
Background
Brushless direct current motors (BLDC) are used, for example, in the automotive field in order to drive reciprocating piston pumps, which are used as pumps or fuel pumps in transport modules of SCR Catalytic systems (Selective Catalytic Reduction). Like three-phase current synchronous motors, brushless dc motors are constructed with excitation caused by permanent magnets. The three-phase current windings are operated via suitable circuits, so that the three-phase current windings generate a rotating magnetic field which moves the (mitziehen) permanent-magnet excited rotor synchronously. The stator coils are usually energized by means of a bridge circuit.
Reciprocating piston pumps result in variable loads acting on the motor shaft of a brushless dc motor. Since the supply current of the motor is proportional to its required torque, the current curve oscillates in the case of such a use of a brushless direct current motor.
Disclosure of Invention
In a method for operating a brushless DC motor, an electrical variable of the brushless DC motor is determined when a change in the speed of the brushless DC motor is required. The application of the request is delayed until the value and/or the gradient of the electrical variable lies within a predefinable range.
The electrical variable is in particular a variable which is proportional to the required torque of the brushless direct current motor, for example the supply current, the phase current, the supply voltage or the phase voltage of the brushless direct current motor.
This method can be used particularly advantageously when the brushless direct current motor is operated with a variable load acting on its motor shaft, for example because it drives a reciprocating piston pump. The variable load causes an oscillation of the supply current of the brushless dc motor. If the requested speed change is now carried out at a point in time at which the current is close to or is already at its local maximum, the current requested for the speed increase is also added to the already high current intensity, so that a high peak current occurs. The power supply system of brushless dc motors must be designed to tolerate high peak currents. However, the current peaks load not only the electrical components of the brushless dc motor but also the mechanical components.
The method now enables a gentle acceleration of the brushless dc motor, in that the speed change is no longer carried out immediately independently of the current currently present, but rather is delayed as a function of the electrical variable, so that high peak currents can be prevented.
When the brushless direct current motor is operating in motoring mode, the implementation of the demand is delayed until the value is below a first threshold value and/or until the gradient is below a second threshold value. By comparing this value with the first threshold value, it is ensured that the already high absolute value of the electrical variable is not further increased by the implementation of this requirement. By comparing the gradient with the second threshold value, it is ensured that during the rise of the supply current, this requirement is not fulfilled. For this purpose, a value smaller than or equal to zero is selected in particular for the second threshold value.
The method can also be used in generator-type operation of brushless dc motors. In this case, too, the method prevents current peaks from occurring, the sign of which is, however, interchanged with respect to the motor mode of operation. It is therefore preferred here to delay the application of this requirement until the value exceeds the third threshold value and/or the gradient exceeds the fourth threshold value. The fourth threshold value is in particular greater than or equal to zero.
When current peaks are to be avoided particularly reliably, the method is preferably carried out such that the requirement is delayed until both the value and the gradient lie within a predefinable range. For motor operation, this means that, preferably, the value is below the first threshold value and the gradient is below the second threshold value. In generator-type operation of the brushless dc motor, it is therefore preferred that this value exceeds the third threshold value and the gradient exceeds the fourth threshold value.
The computer program is provided for carrying out each step of the method, in particular when the computer program is executed on a calculator or an electronic controller. The computer program enables implementation of the different embodiments of the method in the electronic control unit without structural changes being necessary here. For this purpose, the computer program is stored on a machine-readable storage medium.
The electronic control unit, which is provided for operating the brushless dc motor by means of the method, is obtained by running the computer program on a conventional electronic control unit.
Drawings
Fig. 1 schematically shows a brushless dc motor which can be operated by means of an embodiment of the method according to the invention.
Fig. 2 shows the motor speed, torque and time course of the supply current of a brushless dc motor which operates in a conventional manner.
Fig. 3 shows a flow diagram of a method according to an embodiment of the invention.
Fig. 4 shows a time profile of the motor speed, the torque and the supply current of a brushless dc motor which is operated by means of a method according to an embodiment of the invention.
Detailed Description
Fig. 1 shows a brushless dc motor 10 with three-phase (dreistraengig) current windings, which has a motor shaft 11. The speed sensor 12 is arranged to measure its motor speed. The brushless dc motor 10 is controlled by an electronic controller 20 by means of a bridge circuit 21, in which a supply voltage U is presentMotAnd supplying a current IMotFlows in the bridge circuit. The brushless dc motor 10 drives a reciprocating piston diaphragm pump, not shown in the transport module of the SCR catalytic system.
By means of the individual pump strokes, a variable load M or a variable torque acts on the motor shaft 11. As shown in fig. 2, the load M changes with the rotation angle ω of the motor shaft 11, wherein 2 pi corresponds to 360 ° rotation. Attention is paid to the oscillation of the load M. Supply current IMotOscillates over time t in synchronism with the current load M. When at the time point t1When it is required to accelerate the hitherto constant motor speed v to a higher value, this can only be achieved by suddenly increasing the supply current IMotTo be implemented. If at the point of time t1At the supply current IMotThen this leads to a current peak in the manner shown.
Fig. 3 shows an exemplary embodiment of the method according to the present invention for the motorized operation of the brushless dc motor 10. The method is carried out along with the time point t1The request 30 starts by increasing the speed v of the brushless dc motor 10. In the electronic controller 20, the current value I of the supply current is measuredMot Detection 31 is performed. This value is compared with a first threshold value S in a first comparison 321And (6) comparing. When the value I isMotNot lower than a first threshold S1Then wait until the condition is met. Subsequent gradient dI to supply currentMotDetection 33 is performed. The gradient is compared with a second threshold value S in a second comparison 342And (6) comparing. When gradient dIMotNot lower than a second threshold S2The same holds true until this condition is also met. The implementation 35 of the speed change is only carried out if both conditions are met, and the method ends in a final step 36.
Fig. 4 shows in a diagram similar to fig. 2 when the implementation 35 is delayed to a time point t2Effect of the embodiment of the method according to the invention at which point in time the value I of the supply current isMotAt a local minimum and a gradient dIMotAnd is therefore zero. Although here too a sudden increase in the supply current occurs, the maximum current intensity achieved here is only slightly above the maximum value of the current intensity that is always achieved in the region of the oscillation.
In a further exemplary embodiment of the method according to the invention, in which the brushless dc motor 10 is operated in generator mode, the method sequence according to fig. 3 is modified in that the value I is used in step 32MotIf the third threshold value is exceeded, and the gradient dI is compared in step 34MotIf the fourth threshold is exceeded. In the same way as in the case of motor operation, the method according to the invention prevents current peaks from occurring here, wherein the current peaks however have a negative sign in generator operation.
Claims (8)
1. Method for operating a brushless DC motor (10), wherein the brushless DC motor (10) is changed on demand (30)Is determined, and the implementation (35) of the request (30) is delayed until the value (I) of the electrical variableMot) And/or gradient (dI)Mot) Is located within a preset range.
2. The method according to claim 1, wherein the electrical parameter is a supply current, a phase current, a supply voltage or a phase voltage of the brushless dc motor.
3. A method according to claim 1 or 2, characterized in that the brushless dc motor (10) is operated with a variable load (M) acting on its motor shaft (11).
4. Method according to any one of claims 1 to 3, characterized in that, in motored operation of the brushless DC motor (10), the implementation (35) of the demand (30) is delayed until the value (I ™)Mot) Is lower than a first threshold value (S)1) And/or said gradient (dI)Mot) Is lower than a second threshold value (S)2）。
5. Method according to any one of claims 1 to 4, characterized in that, in generator-type operation of the brushless DC motor (10), the implementation (35) of the demand (30) is delayed until the value (I)Mot) Exceeds a third threshold value, and/or the gradient (dI)Mot) The fourth threshold is exceeded.
6. Computer program arranged to perform each step of the method according to any of claims 1 to 5.
7. A machine-readable storage medium on which the computer program according to claim 6 is stored.
8. An electronic controller (20) arranged for operating a brushless direct current motor by means of a method according to any one of claims 1 to 5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018212991.6A DE102018212991A1 (en) | 2018-08-03 | 2018-08-03 | Method of operating a brushless DC motor |
| DE102018212991.6 | 2018-08-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110808697A true CN110808697A (en) | 2020-02-18 |
Family
ID=69168513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910712213.XA Pending CN110808697A (en) | 2018-08-03 | 2019-08-02 | Method for operating a brushless DC motor |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR20200015396A (en) |
| CN (1) | CN110808697A (en) |
| DE (1) | DE102018212991A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300640A (en) * | 2021-05-25 | 2021-08-24 | 上海飞象健康科技有限公司 | Jet flow blockage protection method, computer readable storage medium and tooth flushing device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5221612B2 (en) * | 2010-09-14 | 2013-06-26 | 株式会社日立カーエンジニアリング | Motor control device and control method for electric oil pump |
| DE102015202777A1 (en) * | 2015-02-16 | 2016-08-18 | Continental Automotive Gmbh | Method for controlling a fuel delivery pump |
-
2018
- 2018-08-03 DE DE102018212991.6A patent/DE102018212991A1/en active Pending
-
2019
- 2019-07-30 KR KR1020190092116A patent/KR20200015396A/en not_active Application Discontinuation
- 2019-08-02 CN CN201910712213.XA patent/CN110808697A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300640A (en) * | 2021-05-25 | 2021-08-24 | 上海飞象健康科技有限公司 | Jet flow blockage protection method, computer readable storage medium and tooth flushing device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102018212991A1 (en) | 2020-02-06 |
| KR20200015396A (en) | 2020-02-12 |
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