CN110798103A - Motor drive control device, motor, and blower - Google Patents
Motor drive control device, motor, and blower Download PDFInfo
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- CN110798103A CN110798103A CN201910649052.4A CN201910649052A CN110798103A CN 110798103 A CN110798103 A CN 110798103A CN 201910649052 A CN201910649052 A CN 201910649052A CN 110798103 A CN110798103 A CN 110798103A
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- energization
- rotational direction
- motor
- drive control
- direction position
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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
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
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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
- H02P2203/00—Indexing scheme relating to controlling arrangements characterised by the means for detecting the position of the rotor
- H02P2203/09—Motor speed determination based on the current and/or voltage without using a tachogenerator or a physical encoder
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- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
A motor drive control device, a motor, and an air blowing device are provided. The motor drive control device includes: a drive control unit that controls driving of the motor unit to which the three-phase ac voltage is input, and switches an energization pattern of phase windings of the motor unit in a predetermined order; a voltage detection unit that detects a voltage of the phase winding; and a position information generating unit that generates rotational direction position information of the rotor of the motor unit based on a detection result of the voltage detecting unit. The drive control unit starts a lower synchronous operation in which the energization mode is switched based on the rotational direction position information, when the rotational direction position of the rotor can be detected as any one of the 1 st to 6 th rotational direction positions that are defined for every 60 ° in electrical angle based on the predetermined rotational direction position information after energization. On the other hand, when the drive control unit cannot detect the arbitrary rotational direction position, the drive control unit adds the energization in the energization mode.
Description
Technical Field
The invention relates to a motor drive control device, a motor and an air supply device.
Background
Conventionally, an air blower device equipped with a brushless DC motor of a sensorless control system is known. In a brushless DC motor of a sensorless control system, a rotational direction position of a rotor is detected based on an induced voltage generated by the rotor. However, when the motor is started, the rotor is stopped or rotated at a low speed, and therefore the rotational direction position of the rotor cannot be detected. Therefore, for example, in japanese patent application laid-open No. 2010-045941, the rotor is raised to a constant rotational speed by forced commutation, then the rotor is caused to rotate by inertia by stopping the forced commutation, and the rotational direction position of the rotor is detected in this state, and the process proceeds to sensorless control.
Patent document 1: japanese patent laid-open publication No. 2010-045941
In the starting by forced commutation, the rotor is rotated by a rotating magnetic field from the stator regardless of the rotational direction position of the rotor. Therefore, the rotor sometimes has difficulty in smoothly rotating. Further, at the start of the start, the level of the induced voltage generated by the rotor is low, and therefore it is also difficult to detect the rotational direction position of the rotor. Therefore, the transition from the forced change over at the time of startup to the sensorless control sometimes fails. When the transition to the sensorless control fails, in order to restart the brushless DC motor, it takes time to start the motor because initial processing such as short-time braking is performed to stop the rotor and then forced commutation is performed. Further, if forced commutation is repeated only through the initial process, the transition to the sensorless control may repeatedly fail.
Disclosure of Invention
The invention aims to provide a motor drive control device, a motor and an air supply device which can improve the starting success rate of a motor part.
An exemplary motor drive control device of the present invention includes: a drive control unit that controls driving of a motor unit to which a three-phase ac voltage is input, and switches an energization mode for energizing phase windings of the motor unit in a predetermined order; a voltage detection unit that detects a voltage of the phase winding; and a position information generating unit that generates rotational direction position information in a rotational direction of a rotor of the motor unit based on a detection result of the voltage detecting unit. The drive control unit starts a synchronous operation in which the energization mode is switched based on the rotational direction position information when the rotational direction position of the rotor can be detected as any one of the 1 st to 6 th rotational direction positions that are defined for every 60 ° in electrical angle based on the rotational direction position information after a predetermined energization. The drive control unit adds the energization mode when the rotational direction position of the rotor cannot be detected as the arbitrary rotational direction position based on the rotational direction position information after a predetermined energization.
An exemplary motor of the present invention includes: a motor unit to which a three-phase ac voltage is input; and the motor drive control device for controlling the drive of the motor unit.
An exemplary air blowing device of the present invention includes: an impeller having blades rotatable about a central axis extending in a vertical direction; and the motor described above that rotates the blades.
According to the exemplary motor drive control device, motor, and blower device of the present invention, the success rate of starting the motor unit can be improved.
Drawings
Fig. 1 is a block diagram showing an example of an air blowing device.
Fig. 2 is a graph showing terminal voltages detected in correspondence with the electrical angle of the rotor in the sensorless control of the motor section.
Fig. 3 is a flowchart for explaining an example of drive control of the motor unit.
Fig. 4 is a flowchart for explaining an example of the starting operation of the motor unit.
Description of the reference symbols
100: an air supply device; 110: an impeller; 111: a blade; 120: a motor; 200: a direct current power supply; 1: a motor section; 10: a rotor; 11: a stator; 12: a phase winding; 12 u: a U-phase winding; 12 v: a V-phase winding; 12 w: a W-phase winding; 12 c: a neutral point; 13 u: a U-phase terminal; 13 v: a V-phase terminal; 13 w: a W-phase terminal; 3: an inverter; 3 a: a resistance; 31u, 31v, 31 w: an upper arm switch; 32u, 32v, 32 w: a lower arm switch; 4: a motor drive control device; 41: a drive control unit; 42: a current detection unit; 43: a storage unit; 44: a voltage detection unit; 46: a position information generating unit; 47: a rotation speed detection unit; and Vu: a U-phase terminal voltage; vv: a V-phase terminal voltage; vw: a W-phase terminal voltage; and Vn: an imaginary neutral point voltage; CA: a central axis; n: the sequence of the power-on modes; m: 1, electrifying times; k: 2 nd power-on times; sk: the upper limit value of the 2 nd power-on times.
Detailed Description
Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings.
In the present specification, a direction parallel to the central axis CA of rotation of the motor unit 1 and the blades 111 in the blower 100 is referred to as an "axial direction".
The U-phase winding 12U, the V-phase winding 12V, and the W-phase winding 12W of the stator 11 of the motor unit 1 may be individually or collectively referred to as a phase winding 12. The phase in which the phase winding 12 is energized in the three-phase alternating voltage is referred to as an energized phase, and the phase in which the phase winding 12 is not energized is referred to as a non-energized phase. In addition, the combination of the two energized phase windings 12 is referred to as an energization pattern. The U-phase voltage, the V-phase voltage, and the W-phase voltage of the three-phase ac voltage may be referred to as phase voltages individually or collectively.
< 1. embodiment >
< 1-1. Structure of air blowing device
Fig. 1 is a block diagram showing an example of an air blowing device 100. In the present embodiment, the blower 100 is an axial fan that generates an airflow flowing from one axial side to the other axial side. However, the blower 100 is not limited to this example, and may be a centrifugal fan that sends out air taken in from the axial direction to the radial outside.
As shown in fig. 1, the air blowing device 100 includes an impeller 110 and a motor 120. The impeller 110 has blades 111 rotatable about a central axis CA extending in the vertical direction. The motor 120 drives the impeller 110 to rotate, thereby rotating the blades 111. Further, blower 100 is connected to dc power supply 200. The dc power supply 200 is a power source of the blower device 100. As shown in fig. 1, a high-voltage-side positive output terminal of the dc power supply 200 is connected to an inverter 3, which will be described later, of the motor 120. The negative output terminal of the low voltage side of the dc power supply 200 is grounded.
< 1-2. structural element of motor
Next, each component of the motor 120 will be explained. The motor 120 includes a motor unit 1, an inverter 3, and a motor drive control device 4.
As described above, the motor 120 has the motor portion 1. A three-phase ac voltage is input from the inverter 3 to the motor unit 1. The motor unit 1 is, for example, a three-phase brushless DC motor (BLDC motor). More specifically, the motor unit 1 includes a rotor 10 and a stator 11. A permanent magnet is provided in the rotor 10. The stator 11 is provided with a U-phase winding 12U, a V-phase winding 12V, and a W-phase winding 12W. In the present embodiment, one ends of the phase windings 12u, 12v, and 12w are connected to the terminals 13u, 13v, and 13w of the motor unit 1, respectively. The other ends of the phase windings 12u, 12v, and 12w may be connected by a Y connection line centered on the neutral point 12c as in the present embodiment, but may be connected by a Δ (delta) connection line.
In addition, as described above, the motor 120 has the inverter 3. The inverter 3 outputs a three-phase ac voltage to the motor unit 1. The inverter 3 has upper arm switches 31u, 31v, 31w and lower arm switches 32u, 32v, 32 w. The upper arm switches 31u, 31v, and 31w and the lower arm switches 32u, 32v, and 32w form a bridge circuit that generates a three-phase ac voltage to be output to the motor unit 1. The bridge circuit has: a U-phase arm in which an upper arm switch 31U on a high voltage side and a lower arm switch 32U on a low voltage side are connected in series; a V-phase arm in which an upper arm switch 31V on a high voltage side and a lower arm switch 32V on a low voltage side are connected in series; and a W-phase arm in which an upper arm switch 31W on the high voltage side and a lower arm switch 32W on the low voltage side are connected in series. The arms are connected in parallel with each other. The high-voltage-side end of each arm is connected to the high-voltage-side terminal of the dc power supply 200. Therefore, a dc voltage from the dc power supply 200 is applied to each arm. The low-voltage side end of each arm is grounded via a current detection resistor 3 a.
The upper arm switches 31u, 31v, 31w and the lower arm switches 32u, 32v, 32w include switching elements and diodes, respectively. As the switching element, for example, an FET (field effect transistor), an IGBT (insulated gate bipolar transistor), or the like is used. The diode is connected in parallel with the switching element with a direction from the low voltage side to the high voltage side of the dc power supply 200 as a positive direction. In other words, the anode of the diode is connected to the low-voltage side end of the switching element, and the cathode is connected to the high-voltage side end of the switching element. The diode functions as a freewheeling diode (freewheeling diode). The diode may be a parasitic diode (i.e., a body diode incorporated in the FET), or may be externally provided to the switching element.
Next, as described above, the motor 120 includes the motor drive control device 4. The motor drive control device 4 controls the driving of the motor unit 1. More specifically, the motor drive control device 4 performs PWM control on the inverter 3, and controls driving of the motor unit 1 via the inverter 3.
< 1-3. structural element of motor drive control device
As shown in fig. 1, the motor drive control device 4 includes a drive control unit 41, a current detection unit 42, a storage unit 43, a voltage detection unit 44, a position information generation unit 46, and a rotation speed detection unit 47.
As described above, the motor drive control device 4 includes the drive control unit 41. The drive control unit 41 controls driving of the motor unit 1 to which the three-phase ac voltage is input, and switches the energization pattern to the phase winding 12 of the motor unit 1 in a predetermined order n. In addition, n is a positive integer. For example, the drive control unit 41 performs sensorless control of the drive of the motor unit 1 using a program and information stored in the storage unit 43. The drive control unit 41 controls the driving of the motor unit 1 by using the inverter 3 that outputs the three-phase ac voltage to the motor unit 1 by controlling on/off of the upper arm switches 31u, 31v, and 31w or the lower arm switches 32u, 32v, and 32w of the inverter 3 by the PWM pulses.
As described above, the motor drive control device 4 includes the current detection unit 42. The current detection unit 42 detects a current value flowing through the motor unit 1. In the present embodiment, the current detection unit 42 detects a current flowing through the current detection resistor 3a connected between the bridge circuit of the inverter 3 and the ground.
The storage unit 43 is a non-transitory storage medium that maintains storage even when power supply is stopped. The storage unit 43 stores information used in each component of the motor drive control device 4, particularly programs and control information used in the drive control unit 41.
As described above, the motor drive control device 4 includes the voltage detection unit 44. The voltage detection unit 44 detects the voltage of the phase winding 12. In the present embodiment, for example, the voltage detection unit 44 detects, as the voltage of the phase winding 12, the terminal voltage of the terminal 13 connected to the non-energized phase winding 12 among the terminal voltages Vu, Vv, Vw. More specifically, the voltage detection unit 44 detects the terminal voltage Vu of the terminal 13U when current is passed between the terminals 13v, 13w of the motor unit 1 as the U-phase voltage of the U-phase winding 12U. The voltage detection unit 44 detects a terminal voltage Vv of the terminal 13V when current is passed between the terminals 13W, 13u of the motor unit 1 as a V-phase voltage of the V-phase winding 12V, and detects a terminal voltage Vw of the terminal 13W when current is passed between the terminals 13u, 13V of the motor unit 1 as a W-phase voltage of the W-phase winding 12W.
As described above, the motor drive control device 4 includes the position information generating unit 46. The position information generating unit 46 generates rotational direction position information in the rotational direction of the rotor 10 of the motor unit 1 based on the detection result of the voltage detecting unit 44. Fig. 2 is a graph showing terminal voltages Vu, Vv, Vw detected in accordance with the electrical angle of the rotor 10 in the sensorless control of the motor section 1. In fig. 2, the curves of the terminal voltages Vu, Vv, Vw represent voltages at the time of non-energization. The rotational direction position information is represented by any one of the 1 st to 6 th rotational direction positions that are defined by dividing the rotational direction position of the rotor 10 by every 60 ° in electrical angle.
For example, when the phase winding 12 is excited as shown in fig. 2, if the non-energized phase is the U-phase, the rotational direction position information indicates that the rotor 10 is at the 1 st rotational direction position at which the electrical angle is 0 ° when the U-phase terminal voltage Vu changes from a level lower than the virtual neutral point voltage Vn to a level higher than the virtual neutral point voltage Vn. When the U-phase terminal voltage Vu changes from a level higher than the virtual neutral point voltage Vn to a level lower than the virtual neutral point voltage Vn, the rotational direction position information indicates that the rotor 10 is at the 4 th rotational direction position having an electrical angle of 180 °. In other words, it is detected that the rotor 10 is located at the 1 st rotational direction position at which the electrical angle is 0 ° at the point where the terminal voltage Vu rises to become equal to the virtual neutral point voltage Vn. Further, it is detected that the rotor 10 is located at the 4 th rotation direction position having an electrical angle of 180 ° at a point where the terminal voltage Vu decreases and becomes equal to the virtual neutral point voltage Vn.
If the non-energized phase is the V-phase, the rotational direction position information indicates that the rotor 10 is at the 3 rd rotational direction position at an electrical angle of 120 ° when the V-phase terminal voltage Vv changes from a level lower than the virtual neutral point voltage Vn to a level higher than the virtual neutral point voltage Vn. When V-phase terminal voltage Vv changes from a level higher than virtual neutral point voltage Vn to a level lower than virtual neutral point voltage Vn, the rotational direction position information indicates that rotor 10 is at the 6 th rotational direction position at an electrical angle of 300 °. In other words, at a point where the terminal voltage Vv rises to become equal to the virtual neutral point voltage Vn, it is detected that the rotor 10 is at the 3 rd rotation direction position at an electrical angle of 120 °. It is detected that the rotor 10 is located at the 6 th rotation direction position at an electrical angle of 300 ° at a point where the terminal voltage Vv drops and becomes equal to the virtual neutral point voltage Vn.
If the non-energized phase is the W-phase, the rotational direction position information indicates that the rotor 10 is at the 2 nd rotational direction position at an electrical angle of 60 ° when the W-phase terminal voltage Vw changes from a level higher than the virtual neutral point voltage Vn to a level lower than the virtual neutral point voltage Vn. When the W-phase terminal voltage Vw changes from a level lower than the virtual neutral point voltage Vn to a level higher than the virtual neutral point voltage Vn, the rotational direction position information indicates that the rotor 10 is at the 5 th rotational direction position having an electrical angle of 240 °. In other words, at a point where the terminal voltage Vw decreases and becomes equal to the virtual neutral point voltage Vn, it is detected that the rotor 10 is at the 2 nd rotation direction position at an electrical angle of 60 °. Further, at a point where the terminal voltage Vw rises to be equal to the virtual neutral point voltage Vn, it is detected that the rotor 10 is at the 5 th rotation direction position where the electrical angle is 240 °.
For example, when the rotor 10 is decelerated, stopped, or reversed without smoothly rotating, the terminal voltages Vu, Vv, and Vw may not be equal to the virtual neutral point voltage Vn. In this case, since the rotational direction position of the rotor 10 is unclear, the position information generating unit 46 generates, for example, rotational direction position information indicating that the rotational direction position is unclear.
As described above, the motor drive control device 4 includes the rotation speed detection unit 47. The rotation speed detector 47 detects the rotation speed of the rotor 10 of the motor unit 1 based on the rotational direction position information.
< 1-4. example of drive control of Motor portion >
Next, an example of the drive control process of the motor unit 1 performed by the motor drive control device 4 will be described. Fig. 3 is a flowchart for explaining an example of drive control of the motor unit 1.
At the start time of fig. 3, the rotor 10 of the motor portion 1 is stopped or rotated at a low speed. Therefore, the drive control unit 41 performs the starting operation of the motor unit 1 in order to generate the induced voltage necessary for generating the rotational direction position information in each of the phase windings 12u, 12v, and 12w (step S1). In the starting operation, after an initial process such as a short-time brake is performed, the rotor 10 of the motor unit 1 is forcibly rotated by forced commutation. In forced commutation, specific two phase windings 12 of the three phase windings 12 of the motor portion 1 are energized and excited for each predetermined energization period. The combination of the two phase windings 12 is switched in a predetermined order n.
When the rotor 10 is rotated smoothly during the startup operation, the drive control unit 41 performs the synchronous operation of the motor unit 1 to accelerate the rotation of the rotor 10 (step S2). In the synchronous operation, the position information generating unit 46 generates the rotational direction position information based on the timing at which the phase voltage of the non-energized phase becomes equal to the virtual neutral point voltage Vn and the detection result of the trend of increase and decrease of the induced voltage at the timing, for example, in each energization mode (see fig. 2).
In the synchronous operation, the drive control unit 41 accelerates the rotation of the rotor 10 by switching the energization mode in accordance with the rotational direction position information every energization period corresponding to the rotational speed of the rotor 10.
When the rotation speed is equal to or higher than the predetermined value, the drive control unit 41 performs the steady control operation of the motor unit 1 (step S3). In the steady control operation, the rotor 10 rotates at a desired rotation speed, and the energization mode is switched according to the drive information and the rotational direction position information of the motor unit 1. When the driving of the motor unit 1 is stopped (yes in step S4), the drive control process of fig. 3 is ended.
< 1-4-1. example of starting operation of Motor portion >
Next, an example of the starting operation of the motor unit 1 will be specifically described. Fig. 4 is a flowchart for explaining a startup operation example of the motor unit 1.
First, after performing initial processing such as short-time braking, the drive control unit 41 starts a start operation by forced commutation (step S101). In the short-time braking, the rotor 10 is stopped by short-circuiting the terminals 13u, 13v, and 13w of the motor unit 1.
Next, the drive control unit 41 performs m times of total energization while switching the energization mode in a predetermined order n (step S102). The number of 1 st energization times m is a positive integer, and is 12 in the present embodiment. The voltage detection unit 44 detects a phase voltage of the non-energized phase (step S103). The position information generating unit 46 generates rotational direction position information (step S104). For example, if the non-energized phase is the U-phase at the m-th energization, the U-phase terminal voltage Vu is detected. Then, if the U-phase terminal voltage Vu tends to increase at a point where the U-phase terminal voltage Vu becomes equal to the virtual neutral point voltage Vn, rotational direction position information indicating that the rotor 10 is located at the 1 st rotational position is generated.
Here, when the drive control unit 41 can detect the rotational direction position of the rotor 10 from the rotational direction position information (yes in step S105), the processing of fig. 4 is ended, and the drive control unit 41 starts the synchronous operation of the motor unit 1.
On the other hand, when the drive control unit 41 cannot detect the rotational direction position of the rotor 10 from the rotational direction position information (no in step S105), the additional energization processing is started. For example, when the rotational direction position information indicates that the rotational direction position of the rotor 10 is not clear, the drive control unit 41 cannot detect the rotational direction position of the rotor 10. Therefore, the drive control unit 41 performs additional energization processing of switching the energization mode Sk times at most to energize (forcibly commutate) the phase winding 12 so as to be able to detect the rotational direction position. The upper limit value Sk is a positive integer of 2 or more, and is set to 6 in the present embodiment.
In the additional energization processing, first, if the 2 nd energization number k of times of energization performed in the additional energization processing does not reach the upper limit value Sk (no in step S106), the drive control unit 41 switches the energization mode in accordance with the sequence n to energize the phase winding 12 (step S107). For example, when the energization mode is switched 12 times before the additional energization processing is started, energization to the phase winding 12 in the 1 st energization mode is performed. Then, the process returns to S103 to detect the phase voltage of the non-energized phase.
On the other hand, if the 2 nd energization number k of times of energization in the additional energization processing reaches the upper limit value Sk (yes in step S106), the process of fig. 4 returns to step S101 to stop the driving and restart of the motor unit 1.
As described above, in the starting operation example of fig. 4, when the rotational direction position of the rotor 10 can be detected based on the rotational direction position information (generated when the number of times of energization is switched in the predetermined order n and reaches the 1 st energization number m), the drive control unit 41 starts the synchronous operation. In other words, when the rotational direction position of the rotor 10 can be detected as any one of the 1 st to 6 th rotational direction positions divided by an electrical angle of 60 ° based on the predetermined rotational direction position information after the energization, the drive control unit 41 starts the synchronous operation in which the energization mode is switched based on the rotational direction position information. When the rotational direction position of the rotor cannot be detected as the above-described arbitrary rotational direction position based on the predetermined rotational direction position information after the energization, the drive control unit 41 adds the energization in the energization mode. That is, the drive control unit 41 performs an additional energization process of switching the energization mode Sk at most and energizing (forced commutation) the phase winding 12.
As described above, for example, when the rotational direction position of the rotor 10 cannot be detected at the end of predetermined energization, the drive control unit 41 adds energization in the energization mode to attempt start-up of the motor unit 1. This can improve the success rate of starting the motor unit 1. Further, since the motor unit 1 is easily started successfully without restarting requiring initial processing such as short-time braking, the success rate of starting the motor unit 1 can be increased. Further, the start-up time of the motor unit 1 can be shortened.
Here, the predetermined energization is performed m times in the energization mode without using the rotational direction position information. That is, forced commutation can be performed by predetermined energization.
In the starting operation example of fig. 4, the number of 1 st energization times m is 12 as described above. That is, the 1 st energization number m is the energization number until the rotor 10 rotates by an electrical angle of 720 ° assuming that the rotor 10 rotates smoothly. If the energization in the energization mode is performed before the rotor 10 rotates by an electrical angle of 720 °, the rotational direction position of the rotor 10 can be detected without adding the energization in many cases. Therefore, the start of the motor unit 1 is more easily successful. In addition, in most cases, since the starting operation of the motor unit 1 is the same every time, the user is less likely to feel discomfort in the starting operation of the motor unit 1.
When the rotational direction position of the rotor 10 can be detected in the additional energization process, the drive control unit 41 immediately starts the synchronous operation based on the rotational direction position information. Specifically, when the rotational direction position of the rotor 10 can be detected as any one of the 1 st to 6 th rotational direction positions after the energization in the energization mode is added, the drive control unit 41 starts the synchronous operation. In this way, the rotational direction position of the rotor 10 can be detected, and the phase winding 12 more suitable for smooth rotation of the rotor 10 can be excited according to the detected rotational direction position. Therefore, the synchronous operation can be started in a shorter time.
In the starting operation example of fig. 4, in the additional energization processing, when the 2 nd energization number k of energization in the energization mode added after the predetermined energization reaches the upper limit Sk, the drive control unit 41 restarts the motor unit 1. By setting the upper limit Sk to the 2 nd energization number k in the additional energization period, it is possible to restart the motor unit 1 when it is very difficult to successfully start the motor unit.
In the starting operation example of fig. 4, as described above, the upper limit value Sk of the 2 nd energization number k is 6. That is, when the rotor 10 is assumed to rotate smoothly, the upper limit value Sk of the 2 nd energization number k is the energization number until the rotor 10 rotates by an electrical angle of 360 ° from the rotational direction position at the end of the predetermined energization. In this way, the phase winding 12 of the motor unit 1 can be energized in all the energization patterns until the 2 nd energization count k reaches the upper limit value Sk. Therefore, the success rate of starting the motor unit 1 becomes higher than that in the case where the energization is performed only in a partial energization mode.
< 2. other >)
The present invention has been described above with reference to exemplary embodiments. In addition, the scope of the present invention is not limited to the present invention. The present invention can be implemented with various modifications without departing from the scope of the present invention. In addition, the matters described in the present invention can be arbitrarily combined as appropriate within a range not inconsistent with each other.
Industrial applicability
The present invention is provided with a motor drive control device, a motor, and an air blowing device for sensorless control of a motor unit.
Claims (8)
1. A motor drive control device includes:
a drive control unit that controls driving of a motor unit to which a three-phase ac voltage is input, and switches an energization mode for energizing phase windings of the motor unit in a predetermined order;
a voltage detection unit that detects a voltage of the phase winding; and
a position information generating unit that generates rotational direction position information in a rotational direction of a rotor of the motor unit based on a detection result of the voltage detecting unit,
the drive control unit starts a synchronous operation in which the energization mode is switched based on the rotational direction position information when the rotational direction position of the rotor can be detected as any one of a 1 st rotational direction position to a 6 th rotational direction position which are divided every 60 ° in electrical angle based on the rotational direction position information after a predetermined energization,
the drive control unit adds the energization mode when the rotational direction position of the rotor cannot be detected as the arbitrary rotational direction position based on the rotational direction position information after a predetermined energization.
2. The motor drive control device according to claim 1,
the predetermined energization is performed for the 1 st energization number in the energization mode without using the rotational direction position information.
3. The motor drive control device according to claim 2,
the 1 st energization number is an energization number until the rotor rotates by an electrical angle of 720 °.
4. The motor drive control device according to any one of claims 1 to 3,
when the rotational direction position of the rotor can be detected as any one of the 1 st to 6 th rotational direction positions after the energization in the energization mode is added, the drive control unit starts the synchronous operation.
5. The motor drive control device according to any one of claims 1 to 4,
the drive control unit restarts the motor unit when a number of 2 nd energization times of energization in the energization mode added after the predetermined energization reaches an upper limit value.
6. The motor drive control device according to claim 5,
the upper limit value of the 2 nd energization count is an energization count until the rotor is rotated by an electrical angle of 360 ° from the rotational direction position at the time of completion of the predetermined energization.
7. A motor, comprising:
a motor unit to which a three-phase ac voltage is input; and
the motor drive control device according to any one of claims 1 to 6, which controls driving of the motor section.
8. An air supply device includes:
an impeller having blades rotatable about a central axis extending in a vertical direction; and
the motor of claim 7, which rotates the blades.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018142308A JP2020022219A (en) | 2018-07-30 | 2018-07-30 | Motor drive control device, motor, and blowing device |
| JP2018-142308 | 2018-07-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110798103A true CN110798103A (en) | 2020-02-14 |
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|---|---|---|---|
| CN201910649052.4A Pending CN110798103A (en) | 2018-07-30 | 2019-07-18 | Motor drive control device, motor, and blower |
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| JP (1) | JP2020022219A (en) |
| CN (1) | CN110798103A (en) |
Citations (5)
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|---|---|---|---|---|
| JPH1169866A (en) * | 1997-08-11 | 1999-03-09 | Matsushita Electric Ind Co Ltd | Device and method for controlling and driving sensorless dc brushless motor |
| JP2003219684A (en) * | 2003-02-13 | 2003-07-31 | Sanyo Electric Co Ltd | Brushless motor driving device |
| CN106664042A (en) * | 2014-08-14 | 2017-05-10 | 皮尔伯格泵技术有限责任公司 | Method for starting a drive motor of an auxiliary assembly of a motor vehicle, and drive motor of an auxiliary assembly of a motor vehicle |
| CN106887978A (en) * | 2015-11-27 | 2017-06-23 | 美蓓亚株式会社 | Motor drive control device |
| CN107241036A (en) * | 2016-03-28 | 2017-10-10 | 株式会社丰田自动织机 | Control device for inverter and vehicle-mounted fluid device |
-
2018
- 2018-07-30 JP JP2018142308A patent/JP2020022219A/en active Pending
-
2019
- 2019-07-18 CN CN201910649052.4A patent/CN110798103A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1169866A (en) * | 1997-08-11 | 1999-03-09 | Matsushita Electric Ind Co Ltd | Device and method for controlling and driving sensorless dc brushless motor |
| JP2003219684A (en) * | 2003-02-13 | 2003-07-31 | Sanyo Electric Co Ltd | Brushless motor driving device |
| CN106664042A (en) * | 2014-08-14 | 2017-05-10 | 皮尔伯格泵技术有限责任公司 | Method for starting a drive motor of an auxiliary assembly of a motor vehicle, and drive motor of an auxiliary assembly of a motor vehicle |
| CN106887978A (en) * | 2015-11-27 | 2017-06-23 | 美蓓亚株式会社 | Motor drive control device |
| CN107241036A (en) * | 2016-03-28 | 2017-10-10 | 株式会社丰田自动织机 | Control device for inverter and vehicle-mounted fluid device |
Also Published As
| Publication number | Publication date |
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| JP2020022219A (en) | 2020-02-06 |
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