CN116260362A - Method for adjusting the lead angle of a brushless DC motor - Google Patents
Method for adjusting the lead angle of a brushless DC motor Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000007423 decrease Effects 0.000 claims abstract description 6
- 238000004891 communication Methods 0.000 claims description 17
- 230000001965 increasing effect Effects 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 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
Abstract
The present disclosure relates to a method for adjusting the lead angle of a brushless direct current motor, wherein the method comprises the steps of: -detecting a rotational speed of the brushless direct current motor or a control command for the brushless direct current motor, -generating a lead angle adjustment value for the brushless direct current motor as a function of the rotational speed or the control command, wherein the lead angle adjustment value increases as a function of a first lead angle adjustment value with an increase in the rotational speed if the rotational speed is below a first rotational speed threshold and decreases as a function of a second lead angle adjustment value with an increase in the rotational speed if the rotational speed is above a first rotational speed threshold, -adjusting the lead angle of the brushless direct current motor as a function of the lead angle adjustment value.
Description
Technical Field
The present disclosure relates to a method for adjusting the lead angle of a brushless direct current motor.
Background
The brushless DC motor is similar to synchronous motor in structure, and the rotation speed of the rotor is affected by the speed of the stator rotating magnetic field and the number of poles of the rotor. The DC brushless motor has a series of advantages of simple structure, reliable operation, convenient maintenance and the like of the AC motor, and has a plurality of advantages of high operation efficiency, good speed regulation performance and the like of the DC motor. Nowadays, the brushless dc motor has been widely used in modern production equipment, instruments and meters, and home appliances.
The rotation of the brushless DC motor is realized by a corresponding control device. The control device firstly rectifies alternating current into direct current, and then based on the direct current, the stator winding of the brushless direct current motor is powered by controlling the on-off of a plurality of electronic devices in a specific sequence to establish a rotating magnetic field, so that a rotor formed by magnetic poles is driven to rotate.
Since the stator windings of a brushless dc motor are inductive loads, the current in the windings is delayed somewhat with respect to the command applied to the stator windings, which affects the efficiency of the brushless dc motor and generates noise. Under the condition that the control logic of the control device, namely the on-off sequence of a plurality of electronic devices is not changed, the operation efficiency of the brushless direct current motor can be obviously improved by selecting a proper lead angle.
Disclosure of Invention
The present disclosure provides a method for adjusting a lead angle of a brushless direct current motor, which is capable of setting an appropriate lead angle according to a rotational speed of the brushless direct current motor within a normal rotational speed range of the brushless direct current motor, so that the brushless direct current motor is efficiently operated. And the lead angle can be reduced to stabilize the rotation speed under the condition that the normal rotation speed range is exceeded. Furthermore, the method according to the present disclosure can prevent the occurrence of an excessively large lead angle under low load, especially under no-load conditions.
Embodiments of the present disclosure provide a method for adjusting a lead angle of a brushless direct current motor, wherein the method includes the steps of: detecting the rotating speed of the brushless direct current motor or a control instruction of the brushless direct current motor; generating an advance angle adjustment value of the brushless direct current motor according to the rotation speed or the control command, wherein the advance angle adjustment value increases as a function of a first advance angle adjustment value with the increase of the rotation speed when the rotation speed is lower than a first rotation speed threshold value, and decreases as a function of a second advance angle adjustment value with the increase of the rotation speed when the rotation speed is higher than the first rotation speed threshold value; and adjusting the lead angle of the brushless direct current motor according to the lead angle adjusting value.
According to an embodiment of the present disclosure, the method further comprises the steps of: generating a lead angle limit value of the brushless direct current motor according to the control command, wherein the lead angle limit value is kept constant along with the increase of the control command when the control command is lower than a first control command threshold value, and the lead angle limit value is increased as a function of the first lead angle limit value along with the increase of the control command when the control command is higher than the first control command threshold value; comparing the lead angle adjustment value with the lead angle limit value; and adjusting the lead angle of the brushless direct current motor according to the minimum value of the lead angle adjusting value and the lead angle limiting value.
Control instructions include, but are not limited to: voltage signals, current signals, frequency signals, duty cycle signals, communication data, wireless signals (including all wireless transmission means known in the art), program instructions.
According to embodiments of the present disclosure, a motor winding of a brushless dc motor generates a current, and a current waveform of the current may be a square wave or a sine wave.
The method for adjusting the lead angle of the brushless direct current motor can be used for increasing the lead angle along with the increase of the rotating speed or a motor control command in the normal rotating speed range of the brushless direct current motor according to the established function, so that the brushless direct current motor can operate with higher efficiency, and in addition, when the rotating speed of the brushless direct current motor is too high, the lead angle is gradually reduced along with the increase of the rotating speed, so that the increasing rate of the rotating speed is reduced, and finally the rotating speed tends to be stable. Therefore, damage to the motor bearing caused by too high rotating speed can be prevented, and the weak magnetic component caused by too large lead angle can also be prevented, so that the phenomenon that the rotor magnetic pole is demagnetized due to the weak magnetic component in too long running time is avoided. Further, in embodiments according to the present disclosure, by adding the lead angle limit function, it is possible to prevent an excessive lead angle from occurring at a lower load or no load, resulting in an excessively rapid, discontinuous, or jump in rotation speed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are required to be used in the description of the embodiments will be briefly described below. It should be apparent that the drawings in the following description are only some exemplary embodiments of the present disclosure, and that other drawings may be obtained from these drawings by those of ordinary skill in the art without undue effort.
Figure 1 shows a control device for a brushless dc motor according to the prior art,
figure 2 shows a flow chart of a method for adjusting the lead angle of a brushless dc motor according to the present disclosure,
figure 3 shows a graph of the lead angle adjustment value according to the present disclosure,
figure 4 shows a flow chart of another method for adjusting the lead angle of a brushless dc motor according to the present disclosure,
figure 5 shows a graph of the lead angle limit according to the present disclosure,
fig. 6 shows a schematic diagram of a relationship between a curve of an advance angle adjustment value and a curve of an advance angle limit value according to the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present disclosure more apparent, exemplary embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present disclosure and not all of the embodiments of the present disclosure, and that the present disclosure is not limited by the example embodiments described herein.
In the present specification and drawings, substantially the same or similar steps and elements are denoted by the same or similar reference numerals, and repeated descriptions of the steps and elements will be omitted. Meanwhile, in the description of the present disclosure, the terms "first," "second," and the like are used merely to distinguish the descriptions, and are not to be construed as indicating or implying relative importance or order.
In the present specification and drawings, elements are described in the singular or plural form according to an embodiment. However, the singular and plural forms are properly selected for the proposed case only for convenience of explanation and are not intended to limit the present disclosure thereto. Accordingly, the singular may include the plural and the plural may include the singular unless the context clearly indicates otherwise. In embodiments of the present disclosure, "connected" does not necessarily mean "directly connected" or "directly contacted" and only requires electrical communication, unless explicitly stated otherwise.
Fig. 1 shows a control device 100 of a brushless dc motor according to the prior art. The control device 100 of such a brushless dc motor is supplied with dc power and has a drive unit 110 and a control unit 120. The driving unit 110 is used to convert the direct current into alternating current so as to drive a brushless direct current motor. The drive unit 110 is composed of, for example, a plurality of electronic switches. These electronic switches may be, for example, transistors of switching characteristics. The rotor of the brushless DC motor can be rotated by controlling the on-off of the electronic switches in a certain switching sequence. The control unit 120 is configured to control the driving unit, for example, on/off of an electronic switch therein, to rotate the brushless dc motor, and may also adjust a control command and a lead angle of the brushless dc motor, thereby adjusting the rotation speed and efficiency of the brushless dc motor.
Fig. 2 shows a flowchart of a method for adjusting the lead angle of a brushless dc motor according to the present disclosure. In the method flow, the rotational speed and the control command of the brushless dc motor are first detected (step S201). Then, a lead angle adjustment value of the brushless DC motor is generated according to the rotational speed or the control command, wherein it is determined in step S202 whether the rotational speed of the brushless DC motor exceeds a first threshold value. Generating an advance angle adjustment value according to a first advance angle adjustment value function based on the rotational speed or the control command (S203) when the rotational speed of the brushless direct current motor is lower than a first rotational speed threshold, and generating an advance angle adjustment value according to a second advance angle adjustment value function based on the rotational speed and the control command (S204) when the rotational speed of the brushless direct current motor is higher than the first rotational speed threshold. Finally, in step S205, the lead angle of the brushless dc motor is adjusted according to the lead angle adjustment value.
The lead angle of the brushless DC motor increases as a function of the first lead angle adjustment value as the rotational speed increases. In the case where the rotational speed of the brushless DC motor is higher than the first rotational speed threshold value, the lead angle of the brushless DC motor decreases as a function of the second lead angle adjustment value as the rotational speed increases.
Fig. 3 shows a graph of fig. 3 showing a lead angle adjustment value according to the present disclosure, which is composed of a first lead angle adjustment value function 301 and a second lead angle adjustment value function 302. It can be seen from the figure that below the first rotation speed threshold R 1 In the case of (a), the lead angle adjustment value β 1 As the rotational speed R increases, as a function of the first lead angle adjustment value 301, above the first rotational speed threshold R 1 In the case of (a), the lead angle adjustment value β 1 As the rotational speed r increases, it decreases as a function of the second lead angle adjustment value 302. The first and second lead angle adjustment value functions 301 and 302 may be generated according to the following formula:
wherein, the liquid crystal display device comprises a liquid crystal display device,
a s4 ＝D 2 -a s3 ，MAX(a s2 )<D 3 ，MAX(a 3 )<D 2 and D 2 ≤D 3 At the point of a s1 ，a s2 ，a s3 ，a s4 The following formula can be obtained after the formula (1) is taken
Wherein K is 1 、K 2 、K 3 、D 1 、D 2 、D 3 Is a real number constant, wherein D 3 For the maximum allowed lead angle, R 1 Representing a first rotation speed threshold, equation (2) describes the lead angle adjustment value β 1 And the rotation speed r and the control command V SP The relationship between the two,
wherein, according to the Sgn function, the rotation speed R is less than or equal to R 1 When b=0, c=1, so equation (2) is:
in some cases, K 1 ≠0；K 3 =0, i.e. adjusting the lead angle β only in dependence on the rotation speed r 1 In other cases, K 1 ＝0；K 3 Not equal to 0, i.e. based on control command V only SP To adjust the lead angle beta 1 。
At a rotational speed R greater than R 1 When b=1, c=0, so equation (2) is:
equation (3) is a first lead angle adjustment value function 301, which is a reciprocal function, whose trend is shown in FIG. 3, between 0 and R 1 As the rotation speed r increases, the lead angle also increases non-linearly.
Equation (4) is a second lead angle adjustment value function 302 that is a linear function whose trend is shown in FIG. 3, at R 1 To r max As the rotation speed r increases, the lead angle linearly decreases.
The management of the lead angle of the brushless dc motor 600 can be achieved by a combination of the first lead angle adjustment value function 301 and the second lead angle adjustment value function 302. In the normal rotational speed range, a suitable lead angle can be set as a function of rotational speed based on the first lead angle adjustment value function 301, so that the brushless dc motor operates with higher efficiency. In contrast, in the case of exceeding the normal rotation speed range, the efficiency priority may be abandoned and the principle of stabilizing the speed may be adopted, so that the lead angle is gradually reduced with the increase of the rotation speed based on the second lead angle adjustment value function 302, so that the increase rate of the rotation speed is reduced by reducing the lead angle, and the rotation speed is finally made to be stabilized. Therefore, damage to the motor bearing caused by too high rotating speed can be prevented, and the weak magnetic component caused by too large lead angle can also be prevented, so that the phenomenon that the rotor magnetic pole is demagnetized due to the weak magnetic component in too long running time is avoided.
Fig. 4 shows a flowchart of another method for adjusting the lead angle of a brushless dc motor according to the present disclosure. In the method flow, the rotational speed or a control command of the brushless dc motor is first detected (step S201). Then, a lead angle adjustment value of the brushless DC motor is generated according to the rotational speed or the control command, wherein it is determined in step S202 whether the rotational speed of the brushless DC motor exceeds a first threshold value. Generating a lead angle adjustment value according to a first lead angle adjustment value function based on the rotational speed or the control command (S203) when the rotational speed of the brushless direct current motor is below a first rotational speed threshold, and generating a lead angle adjustment value according to a second lead angle adjustment value function based on the rotational speed when the rotational speed of the brushless direct current motor is above the first rotational speed threshold (S204).
In step S402, a lead angle limit value of the brushless dc motor is generated according to the control command. Subsequently, in step S405, the lead angle adjustment value generated in step S203 or step S204 is compared with the lead angle limit value generated in step S402. Finally, in step S406, the lead angle of the brushless dc motor is adjusted according to the minimum value of the lead angle adjustment value and the lead angle limit value.
Fig. 5 shows a graph of the lead angle limit value according to the present disclosure when the control command is a voltage signal. As can be seen from the figure, at voltage U sp Below the first voltage threshold U s In the case of (a), the lead angle limit value beta 2 With voltage U sp Is kept constant at voltage U sp Above a first voltage threshold U s In the case of (a), the lead angle limit value beta 2 As the voltage increasesIncreasing as a function of the first lead angle limit.
Fig. 5 shows a graph of the lead angle limit value according to the present disclosure when the control command is a current signal. As can be seen from the figure, at current I sp Below the first current threshold I s In the case of (a), the lead angle limit value beta 2 With current I sp Is kept constant at current I sp Above a first current threshold I s In the case of (a), the lead angle limit value beta 2 And increases as a function of the first lead angle limit as the current increases.
Fig. 5 shows a graph of the lead angle limit value according to the present disclosure when the control command is a frequency signal. As can be seen from the figure, at frequency f sp Below the first frequency threshold f s In the case of (a), the lead angle limit value beta 2 With frequency f sp Is kept constant at a frequency f sp Above a first frequency threshold f s In the case of (a), the lead angle limit value beta 2 And increases as the frequency increases as a function of the first lead angle limit.
Fig. 5 shows a graph of the lead angle limit value according to the present disclosure when the control command is a duty cycle signal. As can be seen from the figure, at duty cycle D sp Below the first duty cycle threshold D s In the case of (a), the lead angle limit value beta 2 With duty cycle D sp Is kept constant at a duty cycle D sp Above the first duty cycle threshold D s In the case of (a), the lead angle limit value beta 2 The first lead angle limit value increases as a function of the increase in duty cycle.
Fig. 5 shows a graph of the lead angle limit value according to the present disclosure when the control command is communication data. As can be seen from the figure, in the communication data value C sp Below the first communication data threshold C s In the case of (a), the lead angle limit value beta 2 With the communication data value C sp Is kept constant at the communication data value C sp Above the first communication data threshold C s In the case of (a), the lead angle limit value beta 2 The communication data value increases as a function of the first lead angle limit value.
Fig. 5 shows a graph of the lead angle limit value according to the present disclosure when the control command is a wireless signal. As can be seen from the figure, at the radio signal value W sp Below the first radio signal threshold W s In the case of (a), the lead angle limit value beta 2 With the wireless signal value W sp Is kept constant at the radio signal value W sp Above the first radio signal threshold W s In the case of (a), the lead angle limit value beta 2 The first lead angle limit value function increases as the wireless signal value increases.
Fig. 5 shows a graph of the lead angle limit value according to the present disclosure when the control command is a program command. As can be seen from the figure, at the program instruction value P sp Below the first program instruction threshold P s In the case of (a), the lead angle limit value beta 2 With the program instruction value P sp Is kept constant at the program instruction value P sp Above the first program instruction threshold P s In the case of (a), the lead angle limit value beta 2 The first lead angle limit value increases as a function of the increase in the program command value.
Where the control command value uses V SP Representative, the first control command threshold uses V s And (3) representing. The curve of the lead angle limit may be generated as follows:
wherein D is 4 、K 4 、V s Equation (5) describes the lead angle limit β for low load conditions, especially no load conditions, as a constant 2 And control command V SP The relationship between the two,
at V SP ≤V s In the case of (c), d=0,
β 2 ＝D 4 (6)
at V SP >V s In the case of (c), d=1,
β 2 ＝D 4 +(V SP -V s )/K 4 (7)
equation (7) is a first lead angle limit value function 501 according to the present disclosure. The lead angle limit value beta depicted in formulas (6) and (7) 2 The curve of (2) is shown in figure 5. The curve represents a limitation of the lead angle adjustment of the brushless dc motor 400. In the case of low loads, in particular no load, the adjustment of the lead angle according to the first and second lead angle adjustment value functions alone may result in a maximum lead angle for the current speed of the no load motor being exceeded in some speed intervals. The problem of excessive lead angle under low load, especially no load, can be effectively limited by the lead angle limiting value curve.
Therefore, the lead angle adjustment value curve shown in fig. 3 and the lead angle limit value curve shown in fig. 5 can be considered simultaneously in a minimum manner, that is, the lead angle β of the brushless dc motor is
β＝MIN(β 1 ,β 2 ) (8)
Fig. 6 is a schematic diagram showing a relationship between a curve of an advance angle adjustment value and a curve of an advance angle limit value according to the present disclosure, wherein a hollow line represents the advance angle adjustment value curve and a dotted line represents the advance angle limit value curve. In adjusting the lead angle of the brushless direct current motor, on the one hand, a lead angle adjustment value is generated based on the rotational speed or the control command of the current brushless direct current motor, and the lead angle of the brushless direct current motor is adjusted according to the first and second lead angle adjustment functions described in detail above based on the lead angle adjustment value, and on the other hand, a limit on the adjustment of the lead angle, that is, a lead angle limit value curve is also generated based on the control command of the brushless direct current motor, whereby the lead angle can be prevented from being excessively large under low load or no load. Therefore, when the lead angle of the brushless DC motor is adjusted, the lead angle adjustment value curve and the lead angle limit value curve are considered at the same time, namely, the minimum value of the lead angle adjustment value curve and the lead angle limit value curve is taken.
The method for comprehensively adjusting the lead angle of the brushless direct current motor can realize that the lead angle is increased with a set function along with the increase of the rotating speed or a motor control command in the normal rotating speed range of the brushless direct current motor, so that the brushless direct current motor can operate with higher efficiency, and the lead angle is gradually reduced along with the increase of the rotating speed when the rotating speed of the brushless direct current motor is too high, so that the increasing rate of the rotating speed is reduced, and finally the rotating speed tends to be stable. Therefore, damage to the motor bearing caused by too high rotating speed can be prevented, and the weak magnetic component caused by too large lead angle can also be prevented, so that the phenomenon that the rotor magnetic pole is demagnetized due to the weak magnetic component in too long running time is avoided. In addition, an excessively large advance angle can be prevented in the case of low loads or no loads, so that the rotational speed changes too quickly, discontinuously or in a jump.
The block diagrams of circuits, units, devices, apparatus, devices, systems referred to in this disclosure are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the circuits, units, devices, apparatuses, devices, systems may be connected, arranged, configured in any manner as long as the desired purpose is achieved. Circuits, elements, devices, means referred to in this disclosure may be implemented in any suitable manner, e.g., as an application specific integrated circuit, field Programmable Gate Array (FPGA), etc. or may be implemented with a general purpose processor in combination with a program.
It will be appreciated by persons skilled in the art that the above-described embodiments are merely examples and that various modifications, combinations, partial combinations and substitutions may be made to the embodiments of the present disclosure according to design requirements and other factors, provided that they fall within the scope of the appended claims or their equivalents, i.e., within the scope of the claims to be protected by the present disclosure.
Claims (10)
1. A method for adjusting the lead angle of a brushless dc motor, wherein the method comprises the steps of:
detecting the rotational speed of the brushless DC motor or a control command for the brushless DC motor,
generating a lead angle adjustment value for the brushless DC motor as a function of the rotational speed or the control command,
wherein the lead angle adjustment value increases as a function of a first lead angle adjustment value as the rotational speed increases in the case where the rotational speed is below a first rotational speed threshold, and decreases as a function of a second lead angle adjustment value as the rotational speed increases in the case where the rotational speed is above the first rotational speed threshold,
-adjusting the lead angle of the brushless dc motor in dependence of the lead angle adjustment value.
2. The method of claim 1, wherein the method further comprises the steps of:
generating a lead angle limit value for the brushless DC motor in dependence on the rotational speed or the control command,
wherein the lead angle limit value is kept constant with an increase in the control command in the case where the control command is lower than the first control command threshold value, and is increased as a function of the first lead angle limit value with an increase in the control command in the case where the control command is higher than the first control command threshold value,
comparing the lead angle adjustment value with the lead angle limit value,
-adjusting the lead angle of the brushless dc motor in dependence of the minimum of the lead angle adjustment value and the lead angle limit value.
3. The method of claim 1, wherein the method further comprises the steps of:
the control command refers to a voltage signal,
generating a lead angle limit value for the brushless dc motor as a function of the rotational speed or the voltage signal,
wherein the lead angle limit value remains constant with an increase in voltage in the case where the voltage is below a first voltage threshold, and increases as a function of the first lead angle limit value with an increase in voltage in the case where the voltage is above the first voltage threshold,
comparing the lead angle adjustment value with the lead angle limit value,
-adjusting the lead angle of the brushless dc motor in dependence of the minimum of the lead angle adjustment value and the lead angle limit value.
4. The method of claim 1, wherein the method further comprises the steps of:
the control command refers to a current signal,
generating a lead angle limit value for the brushless dc motor as a function of the rotational speed or the current signal,
wherein the lead angle limit value remains constant with an increase in current when the current is below a first current threshold, wherein the lead angle limit value increases as a function of the first lead angle limit value with an increase in current when the current is above a first current signal threshold,
comparing the lead angle adjustment value with the lead angle limit value,
-adjusting the lead angle of the brushless dc motor in dependence of the minimum of the lead angle adjustment value and the lead angle limit value.
5. The method of claim 1, wherein the method further comprises the steps of:
the control command refers to a wireless signal,
generating a lead angle limit value for the brushless dc motor as a function of the rotational speed or the wireless signal,
wherein the lead angle limit value remains constant as the value of the wireless signal increases in the event that the value of the wireless signal is below a first wireless signal threshold, and wherein the lead angle limit value increases as the value of the wireless signal increases as a function of the first lead angle limit value,
comparing the lead angle adjustment value with the lead angle limit value,
-adjusting the lead angle of the brushless dc motor in dependence of the minimum of the lead angle adjustment value and the lead angle limit value.
6. The method of claim 1, wherein the method further comprises the steps of:
the control commands refer to program instructions that,
generating a lead angle limit value for said brushless dc motor in dependence on said rotational speed or said program instructions,
wherein the lead angle limit value remains constant as the program command value increases in the case where the program command value is below the first program command threshold, and increases as the program command value increases as a function of the first lead angle limit value in the case where the program command value is above the first program command threshold,
comparing the lead angle adjustment value with the lead angle limit value,
-adjusting the lead angle of the brushless dc motor in dependence of the minimum of the lead angle adjustment value and the lead angle limit value.
7. The method of claim 1, wherein the method further comprises the steps of:
the control command refers to a frequency signal,
generating a lead angle limit value for the brushless dc motor as a function of the rotational speed or the frequency signal,
wherein the lead angle limit value remains constant with increasing frequency in the event that the frequency is below a first frequency threshold, and wherein the lead angle limit value increases as a function of the first lead angle limit value with increasing frequency in the event that the frequency is above the first frequency threshold,
comparing the lead angle adjustment value with the lead angle limit value,
-adjusting the lead angle of the brushless dc motor in dependence of the minimum of the lead angle adjustment value and the lead angle limit value.
8. The method of claim 1, wherein the method further comprises the steps of:
the control command refers to a duty cycle signal,
generating a lead angle limit value for the brushless dc motor as a function of the rotational speed or the duty cycle signal,
wherein the lead angle limit value remains constant with an increase in duty cycle in the case where the duty cycle is below a first duty cycle threshold, and increases as a function of a first lead angle limit value with an increase in duty cycle in the case where the duty cycle is above the first duty cycle threshold,
comparing the lead angle adjustment value with the lead angle limit value,
-adjusting the lead angle of the brushless dc motor in dependence of the minimum of the lead angle adjustment value and the lead angle limit value.
9. The method of claim 1, wherein the method further comprises the steps of:
the control command refers to communication data,
generating a lead angle limit value for said brushless dc motor based on said rotational speed or said communication data,
wherein the lead angle limit value remains constant as the communication data value increases in the event that the communication data value is below the first communication data threshold, and increases as a function of the first lead angle limit value as the communication data value increases in the event that the communication data value is above the first communication data threshold,
comparing the lead angle adjustment value with the lead angle limit value,
-adjusting the lead angle of the brushless dc motor in dependence of the minimum of the lead angle adjustment value and the lead angle limit value.
10. The method according to claim 1 or 2, characterized in that: the motor windings of the brushless dc motor generate a current, which may have a square wave or a sine wave current waveform.
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| CN202111505563.2A CN116260362A (en) | 2021-12-10 | 2021-12-10 | Method for adjusting the lead angle of a brushless DC motor |
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| CN202111505563.2A CN116260362A (en) | 2021-12-10 | 2021-12-10 | Method for adjusting the lead angle of a brushless DC motor |
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