JP2004304965A - Method and device for controlling motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly return a motor to its original state of rotation when power supply is restored after instantaneous service interruption. <P>SOLUTION: A motor control device comprises: a voltage detection section 17 which detects the voltage on the input side of an inverter 4; an instantaneous service interruption control section 18 which performs a predetermined processing, using the detected DC voltage as an input, and outputs first and second switching signals; a first switching section 19 which is operated according to the first switching signal and selects a preset current command value I0 for regeneration or a preset current command value I1 for powering; and a second switching section 10 which is operated according to the first switching signal, and selects a current command I* from a speed control section 14 or the current command value selected by the first switching section 19 and supplies it to a current control section 15. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a motor control method and a motor control device, and more particularly, to a system for controlling a supply current or a supply voltage based on a position of a magnetic pole of a rotor when an instantaneous stop (instantaneous stop) of a power supply occurs. In addition, the present invention relates to a motor control method and an apparatus for quickly restoring the original control state when power is restored.
[0002]
[Prior art]
Conventionally, an inverter circuit that receives DC power, a permanent magnet synchronous motor connected to the inverter circuit, a rotation speed control circuit that controls the rotation speed of the permanent magnet synchronous motor, and a control power supply are obtained from the DC power. A power failure detection circuit that detects the stop of the supply of DC power, and a power failure operation circuit that controls the rotation speed of the permanent magnet synchronous motor so that the DC voltage becomes a predetermined value at the time of the power failure. Permanent magnet synchronous motor that controls the rotation speed of the permanent magnet synchronous motor, secures the power of the control power supply and continues the rotation speed control of the permanent magnet synchronous motor at the same time, and recovers the power at the same time when the power failure is recovered. A driving device has been proposed (see Patent Document 1).
[0003]
If this permanent magnet synchronous motor drive device is adopted, the number of rotations of the motor during a power failure is controlled to keep the DC voltage constant, and power is stably supplied to the control circuit and the like, and at the same time, the deceleration control of the motor is performed to reduce the deceleration time. Can be shortened.
[0004]
[Patent Document 1]
JP-A-2002-374700
[0005]
[Problems to be solved by the invention]
If a momentary power outage occurs while the motor driven by the inverter is operating under speed control, the microcomputer is stopped, so the motor continues to rotate due to inertia when power is restored. In this case, the rotor pole position cannot be accurately estimated, or the integral term of the control system is not in the optimum state, so that the motor loses synchronism and returns to the original rotational position normally. There are inconveniences such as inability to do so.
[0006]
[Object of the invention]
The present invention has been made in view of the above-described problems, and provides a motor control method and a motor control method capable of promptly returning a motor to an original rotation state when power is restored from a momentary power failure. It is an object.
[0007]
[Means for Solving the Problems]
The motor control method according to claim 1 detects the magnetic pole position of the rotor when the permanent magnet motor is driven by supplying an output from an inverter that receives DC power to the permanent magnet motor, and detects the detected magnetic pole position. A motor control method for controlling an inverter to perform speed control of a permanent magnet motor based on
In response to detecting the momentary power interruption, the speed control is stopped, and in controlling the current command value so as to have a predetermined DC voltage,
Two target voltages of the DC voltage are set, and in response to the DC voltage having reached one of the target voltages, the current command value is set so that the powering operation / regeneration operation is performed according to the reached target voltage. Is the way.
[0008]
The motor control method according to claim 2 is a method in which the inverter control can be continued during the power running operation and a voltage that hardly decelerates the permanent magnet motor is used as the target voltage for the regenerative operation.
[0009]
A motor control method according to a third aspect is a method in which a current value that can estimate a magnetic pole position of a rotor is used as a current command value during power running operation.
[0010]
According to a fourth aspect of the present invention, when the permanent magnet motor is driven by supplying an output from an inverter that receives DC power to the permanent magnet motor, a magnetic pole position of the rotor is detected, and the detected magnetic pole position is detected. A motor control method for controlling an inverter to perform speed control of a permanent magnet motor based on
In response to detecting the momentary power interruption, the speed control is stopped, and in controlling the current command value so as to have a predetermined DC voltage,
In this method, a difference between the target voltage of the DC voltage and the detected DC voltage is calculated, and PI control is performed on the difference to set a current command value.
[0011]
According to a fifth aspect of the present invention, when the permanent magnet motor is driven by supplying an output from an inverter that receives DC power to the permanent magnet motor, a magnetic pole position of the rotor is detected, and the detected magnetic pole position is detected. A motor control method for controlling an inverter to perform speed control of a permanent magnet motor based on
In response to detecting the momentary power interruption, the speed control is stopped, and in controlling the current command value so as to have a predetermined DC voltage,
This is a method in which a target voltage of a DC voltage is set to an inverter maximum limit voltage, and a current command value is set so that power is regenerated when initial kinetic energy is large.
[0012]
A motor control method according to a sixth aspect is a method for detecting an instantaneous blackout of a power supply in response to a detected value of a DC voltage falling below a predetermined voltage level.
[0013]
The motor control device according to claim 7, when the permanent magnet motor is driven by supplying an output from an inverter that receives DC power to the permanent magnet motor, detects a magnetic pole position of the rotor, and detects the detected magnetic pole position. In the motor control device that controls the inverter to perform the speed control of the permanent magnet motor based on
In response to detecting the momentary power failure, stop the speed control and include control means for controlling the current command value so as to have a predetermined DC voltage,
As the control means, two target voltages of the DC voltage are set, and in response to the DC voltage reaching one of the target voltages, the current command is set so that the powering operation / regeneration operation is performed in accordance with the reached target voltage. The one that sets the value is adopted.
[0014]
The motor control device according to claim 8 employs, as the target voltage for the regenerative operation, a voltage which can continue the inverter control during the power running operation and hardly decelerates the permanent magnet motor.
[0015]
According to a ninth aspect of the present invention, the motor control device employs, as the current command value at the time of the power running operation, a current value that can estimate the magnetic pole position of the rotor.
[0016]
The motor control device according to claim 10 is configured to detect a magnetic pole position of the rotor and to detect the detected magnetic pole position when the permanent magnet motor is driven by supplying an output from an inverter that receives DC power to the permanent magnet motor. In the motor control device that controls the inverter to perform the speed control of the permanent magnet motor based on
In response to detecting the momentary power failure, stop the speed control and include control means for controlling the current command value so as to have a predetermined DC voltage,
As the control means, one that calculates a difference between the target voltage of the DC voltage and the detected DC voltage, performs PI control on the difference, and sets a current command value is adopted.
[0017]
The motor control device according to claim 11 detects a magnetic pole position of the rotor when the output from the inverter that receives DC power is supplied to the permanent magnet motor to drive the permanent magnet motor. In a motor control device that controls an inverter to perform speed control of a permanent magnet motor based on a magnetic pole position,
In response to detecting the momentary power failure, stop the speed control and include control means for controlling the current command value so as to have a predetermined DC voltage,
As the control means, one that sets the target voltage of the DC voltage to the inverter maximum limit voltage and sets the current command value so as to regenerate power when the initial kinetic energy is large is adopted.
[0018]
According to a twelfth aspect of the present invention, as the motor control unit, a control unit that detects an instantaneous interruption of the power supply in response to a detected value of the DC voltage falling below a predetermined voltage level is adopted.
[0019]
[Action]
According to the motor control method of the first aspect, when the permanent magnet motor is driven by supplying the output from the inverter that receives DC power to the permanent magnet motor, the magnetic pole position of the rotor is detected and detected. In a motor control method in which an inverter is controlled to perform speed control of a permanent magnet motor based on a magnetic pole position,
In response to detecting the momentary power interruption, the speed control is stopped, and in controlling the current command value so as to have a predetermined DC voltage,
Two target voltages of the DC voltage are set, and in response to the DC voltage having reached one of the target voltages, the current command value is set so that the powering operation / regeneration operation is performed according to the reached target voltage. Therefore, in the event of a power failure, the speed control is stopped, and the microcomputer that performs inverter control and the like can be driven while the permanent magnet motor keeps a state close to free-run regardless of the load state. When power is restored from a power outage, it is possible to quickly restore the original operation state.
[0020]
According to the motor control method of the present invention, the inverter control can be continued during the power running operation and the voltage that hardly decelerates the permanent magnet motor is adopted as the target voltage for the regenerative operation. In addition to minimizing the regenerative operation, which is a major cause of the above, the same operation as the first aspect can be achieved.
[0021]
According to the motor control method of the third aspect, since the current value that can estimate the magnetic pole position of the rotor is used as the current command value during the power running operation, the estimation calculation of the magnetic pole position of the rotor can be normally continued. In addition, the same operation as the first aspect can be achieved.
[0022]
According to the motor control method of the fourth aspect, when the permanent magnet motor is driven by supplying the output from the inverter that receives DC power to the permanent magnet motor, the magnetic pole position of the rotor is detected and detected. In a motor control method in which an inverter is controlled to perform speed control of a permanent magnet motor based on a magnetic pole position,
In response to detecting the momentary power interruption, the speed control is stopped, and in controlling the current command value so as to have a predetermined DC voltage,
Since the difference between the target voltage of the DC voltage and the detected DC voltage is calculated and the current command value is set by performing the PI control on the difference, the rapid operation of the permanent magnet motor while maintaining the inverter DC voltage at a certain level is performed. It is possible to keep the free-run state without deceleration, and to quickly restore the original operating state when the power is restored from the momentary power failure.
[0023]
According to the motor control method of the fifth aspect, when the permanent magnet motor is driven by supplying the output from the inverter that receives DC power to the permanent magnet motor, the magnetic pole position of the rotor is detected and detected. In a motor control method in which an inverter is controlled to perform speed control of a permanent magnet motor based on a magnetic pole position,
In response to detecting the momentary power interruption, the speed control is stopped, and in controlling the current command value so as to have a predetermined DC voltage,
The target voltage of the DC voltage is set to the inverter's maximum limit voltage, and the current command value is set so that the power is regenerated when the initial kinetic energy is large. The motor can be prevented from stopping, and in the event of a power failure, speed control is stopped, and the microcomputer that performs inverter control etc. is driven while the permanent magnet motor keeps a state close to free run regardless of the load state. As a result, when the power is restored after a momentary power failure, the original operating state can be promptly restored.
[0024]
According to the motor control method of claim 6, since the instantaneous interruption of the power supply is detected in response to the detected value of the DC voltage falling below the predetermined voltage level, the instantaneous interruption of the power supply is detected based on the DC voltage. In this case, the same operation as any one of claims 1 to 5 can be achieved.
[0025]
According to the motor control device of the present invention, when the permanent magnet motor is driven by supplying the output from the inverter that receives DC power to the permanent magnet motor, the magnetic pole position of the rotor is detected and detected. In a motor control device that controls an inverter to perform speed control of a permanent magnet motor based on a magnetic pole position,
In response to the detection of the momentary blackout of the power supply, the control means stops the speed control, and in controlling the current command value so as to have a predetermined DC voltage,
The control means sets two target voltages of the DC voltage, and in response to the DC voltage having reached one of the target voltages, a current command to perform the powering operation / the regenerative operation according to the reached target voltage. Value can be set.
[0026]
Therefore, at the time of power failure, the speed control is stopped, and the microcomputer that performs inverter control and the like can be continuously driven while the permanent magnet motor keeps a state close to free-run regardless of the load state. When the power is restored, the original operation state can be promptly restored.
[0027]
According to the motor control device of the eighth aspect, since the inverter control can be continued during the power running operation and the voltage that hardly decelerates the permanent magnet motor is adopted as the target voltage for the regenerative operation, the deceleration of the permanent magnet motor is reduced. In addition to minimizing the regenerative operation, which is a major cause of the above, the same operation as in the seventh aspect can be achieved.
[0028]
According to the motor control device of the ninth aspect, since the current value for estimating the magnetic pole position of the rotor is adopted as the current command value during the power running operation, the calculation for estimating the magnetic pole position of the rotor can be normally continued. In addition, the same operation as the seventh aspect can be achieved.
[0029]
According to the motor control device of the tenth aspect, when the permanent magnet motor is driven by supplying the output from the inverter that receives DC power to the permanent magnet motor, the magnetic pole position of the rotor is detected and detected. In a motor control device that controls an inverter to perform speed control of a permanent magnet motor based on a magnetic pole position,
In response to the detection of the momentary blackout of the power supply, the control means stops the speed control, and in controlling the current command value so as to have a predetermined DC voltage,
The control means can calculate the difference between the target DC voltage and the detected DC voltage, and perform PI control on the difference to set the current command value.
[0030]
Therefore, the permanent magnet motor can be maintained in a free-run state without a rapid deceleration of the permanent magnet motor while maintaining the inverter DC voltage at a certain level. The operating state can be restored.
[0031]
According to the motor control device of the present invention, when the permanent magnet motor is driven by supplying an output from an inverter that receives DC power to the permanent magnet motor, the magnetic pole position of the rotor is detected and detected. A motor control device that controls an inverter to perform speed control of a permanent magnet motor based on the determined magnetic pole position;
In response to the detection of the momentary blackout of the power supply, the control means stops the speed control, and in controlling the current command value so as to have a predetermined DC voltage,
The control means sets the target voltage of the DC voltage to the inverter maximum limit voltage, and sets the current command value so as to regenerate power when the initial kinetic energy is large.
[0032]
Therefore, it is possible to prevent the permanent magnet motor from stopping by performing the regenerative processing when the kinetic energy is small, and to stop the speed control at the time of the power failure to bring the permanent magnet motor into a state close to free run regardless of the load state. The microcomputer that performs the inverter control or the like can be continuously driven while holding the voltage, and the original operation state can be promptly restored when the power is restored from the momentary power failure.
[0033]
According to the motor control device of claim 12, as the control means, a device that detects an instantaneous interruption of the power supply in response to the detection value of the DC voltage falling below a predetermined voltage level is employed. The instantaneous interruption of the power supply can be detected based on this, and in this case, the same operation as any one of claims 7 to 11 can be achieved.
[0034]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a motor control method and apparatus according to the present invention will be described in detail with reference to the accompanying drawings.
[0035]
FIG. 1 is a block diagram showing one embodiment of the motor control device of the present invention.
[0036]
The motor control device includes a rectifier circuit 2 connected to an AC power supply 1 and outputting DC power, a capacitor 3 for smoothing DC voltage, an inverter 4 receiving DC power and outputting three-phase AC power, And a permanent magnet motor 5 that rotates when the phase AC power is supplied.
[0037]
Then, while inputting the supply currents for the two phases of the permanent magnet motor 5 and inputting the voltage command V *, a conventionally known process is performed to estimate the magnetic pole position θ of the rotor of the permanent magnet motor 5 (this estimation). Is a mode of detection) a position estimating unit 11, a speed detecting unit 12 that performs a conventionally known speed detecting process using a magnetic pole position θ estimation signal as an input, and calculates a difference between the speed command ω * and the actual speed ω. A subtraction unit 13, a speed control unit 14 that calculates a current command I * by performing a conventionally known process using a difference between the speed command ω * and the actual speed ω as an input, and a supply current for two phases of the permanent magnet motor 5. A current control unit 15 that performs a conventionally known current control operation with a magnetic pole position θ estimation signal and a current command I * as inputs and outputs a voltage command V *, and a voltage control V * from the current control unit 15 as an input. Perform known processing to drive the inverter A gate signal generator 16 for outputting a gate signal for controlling each of the switching elements, a voltage detector 17 for detecting a voltage (DC voltage) on the input side of the inverter 4, and a predetermined process using the detected DC voltage as an input. An instantaneous power failure control unit 18 that outputs the first and second switching signals, and is operated by the first switching signal to set a preset regenerative current command value I0 or a preset powering current A first switching unit 19 for selecting the command value I1, and a current command I * from the speed control unit 14 which is operated by the first switching signal or a current command value selected by the second switching unit 19 to select a current. And a second switching unit 10 that supplies the control unit 15 with the second switching unit 10.
[0038]
Although not particularly shown, the power supply voltage of each of the above-described units is supplied from the DC voltage of the inverter 4. The microcomputer from the position estimation unit 11 to the instantaneous stop control unit is included.
[0039]
FIG. 2 is a block diagram showing another embodiment of the motor control device of the present invention.
[0040]
This motor control device differs from the motor control device of FIG. 1 only in that an encoder 11 a for detecting the magnetic pole position of the rotor of the permanent magnet motor 5 is provided instead of the position estimating unit 11.
[0041]
FIG. 3 is a schematic diagram for explaining the process of the instantaneous stop control unit 18.
[0042]
In the instantaneous stop control unit 18, three target voltages V1, V2, and V3 (V1 <V2 <V3) are set, and when the DC voltage detected by the voltage detection unit 17 decreases to the target voltage V3, It is determined that a stop has occurred, the second switching unit 10 is switched to select the current command value selected by the first switching unit 19 and supply the current command value to the current control unit 15, and conversely, the voltage detection unit 17 When the detected DC voltage rises to the target voltage V3, it is determined that the power has been restored, and the second switching unit 10 is switched to select the current command I * from the speed control unit 14 and supply it to the current control unit 15. Let it work. Therefore, when an instantaneous stop occurs, the speed control can be stopped.
[0043]
When an instantaneous power failure occurs, the DC voltage drops. When the DC voltage decreases to the target voltage V1, the first switching unit 19 selects the current command value I0 at the time of regeneration, so that a regenerative operation is performed to increase the DC voltage. When the DC voltage rises to the target voltage V2 as a result of the regenerative operation, the first switching unit 19 selects the current command value I1 at the time of powering, so that the powering operation is performed to reduce the DC voltage. Therefore, during the instantaneous power failure period, the components of FIG. 1 or 2, in particular, the position estimating unit 11 and the speed detecting unit 12 can be continuously operated to continuously detect the speed of the permanent magnet motor 5.
[0044]
FIG. 4 is a schematic diagram for explaining another example of the process of the instantaneous interruption control unit.
[0045]
In the instantaneous interruption processing unit, two target voltages V4 and V3 (V4 <V3) are set, and an instantaneous interruption occurs when the DC voltage detected by the voltage detection unit 17 drops to the target voltage V3. And the second switching unit 10 is switched to select the current command value selected by the first switching unit 19 and supply the selected current command value to the current control unit 15. When the voltage rises to the target voltage V3, it is determined that the power has been restored, and the second switching unit 10 is switched to select and supply the current command I * from the speed control unit 14 to the current control unit 15. Therefore, when an instantaneous stop occurs, the speed control can be stopped.
[0046]
When an instantaneous power failure occurs, the DC voltage drops. Then, the difference between the target voltage V4 and the DC voltage detected by the voltage detection unit 17 is calculated by the subtraction unit 10a, the PI calculation is performed by the PI calculation unit 10b using the difference as an input, and the current command value is output. The voltage can be controlled to approximately the target voltage V4.
[0047]
FIG. 5 is a schematic diagram illustrating still another example of the instantaneous stop control unit.
[0048]
In the instantaneous power failure control unit, the maximum DC voltage is set as the target voltage, and when the kinetic energy at the beginning of the instantaneous power failure is large, regenerative operation is performed to increase the DC voltage. When the DC voltage reaches the maximum DC voltage, the first switching unit 19 is operated to select the current command value I1 at the time of power running.
[0049]
In addition, an instantaneous power failure detecting unit 18a that detects an instantaneous power failure by inputting AC power on the upstream side of the rectifier circuit 2 (for example, by comparing with a reference voltage) is provided, and the second switching is performed by an output from the instantaneous power failure detecting unit 18a. The switching operation of the unit 10 is performed.
[0050]
FIG. 6 is a diagram illustrating a specific example of a change in the actual speed of the permanent magnet motor, a change in the estimated speed of the permanent magnet motor, and a change in the DC voltage of the inverter due to the occurrence of the instantaneous blackout.
[0051]
As can be seen from FIG. 6, if an instantaneous power failure occurs, the permanent magnet motor 5 enters a free-run state and the actual speed gradually decreases. However, since the speed detection unit continues to operate, high accuracy with respect to the actual speed is obtained. It is possible to obtain an estimated speed that can be approximated by
[0052]
Then, the DC voltage of the inverter is restored by the power restoration, and the actual speed of the permanent magnet motor 5 is increased by performing the speed control. From the beginning of this operation, it is necessary to obtain an estimated speed that can approximate the actual speed with high accuracy. And a highly accurate current control operation can be performed, so that the original state can be quickly restored.
[0053]
In addition, it goes without saying that the processing of each unit in the above embodiment can be performed by a computer program.
[0054]
【The invention's effect】
The invention according to claim 1 can stop the speed control at the time of a power failure and continue to drive the microcomputer that performs the inverter control or the like while keeping the permanent magnet motor close to the free-run state regardless of the load state. When the power is restored from a momentary power failure, a specific effect is obtained that the original operation state can be promptly restored.
[0055]
According to the second aspect of the invention, the regenerative operation, which is a major cause of deceleration of the permanent magnet motor, can be minimized, and the same effects as those of the first aspect can be obtained.
[0056]
According to the third aspect of the present invention, the calculation of the magnetic pole position of the rotor can be normally continued, and the same effect as that of the first aspect can be obtained.
[0057]
According to the invention of claim 4, it is possible to keep the free-run state without rapidly decelerating the permanent magnet motor while maintaining the inverter DC voltage at a certain level, and furthermore, at the time of power recovery from a momentary power failure of the power supply. This has a specific effect that the original operation state can be promptly restored.
[0058]
The invention according to claim 5 can prevent the permanent magnet motor from stopping by performing regenerative processing when the kinetic energy is small, and at the time of a power failure, stop the speed control to keep the permanent magnet motor free regardless of the load state. A microcomputer that performs inverter control, etc., can be driven while maintaining a state close to a run, and as a result, when power is restored after a momentary power failure, it can be quickly restored to the original operating state. It works.
[0059]
According to the invention of claim 6, an instantaneous interruption of the power supply can be detected based on the DC voltage, and in this case, the same effect as any of claims 1 to 5 is obtained.
[0060]
The invention according to claim 7 can stop the speed control at the time of a power failure and continue to drive the microcomputer that performs the inverter control and the like while keeping the permanent magnet motor in a state close to the free run regardless of the load state. When the power is restored from a momentary power failure, a specific effect is obtained that the original operation state can be promptly restored.
[0061]
According to the eighth aspect of the invention, the regenerative operation, which is a major cause of the deceleration of the permanent magnet motor, can be minimized, and the same effect as that of the seventh aspect is obtained.
[0062]
According to the ninth aspect of the present invention, the calculation for estimating the magnetic pole position of the rotor can be normally continued, and the same effect as that of the seventh aspect can be obtained.
[0063]
The invention according to claim 10 can maintain the free-run state without rapidly decelerating the permanent magnet motor while maintaining the inverter DC voltage at a certain level. This has a specific effect that the original operation state can be promptly restored.
[0064]
According to the eleventh aspect of the present invention, the permanent magnet motor can be prevented from stopping by performing regenerative processing when the kinetic energy is small. At the time of a power failure, the speed control is stopped and the permanent magnet motor is free regardless of the load state. A microcomputer that performs inverter control, etc., can be driven while maintaining a state close to the run, and as a result, when power is restored after a momentary power failure, it can be quickly restored to the original operating state It works.
[0065]
According to the twelfth aspect, an instantaneous power failure of the power supply can be detected based on the DC voltage. In this case, the same effect as any one of the seventh to eleventh aspects is obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a motor control device according to the present invention.
FIG. 2 is a block diagram showing another embodiment of the motor control device of the present invention.
FIG. 3 is a schematic diagram illustrating a process of an instantaneous interruption control unit.
FIG. 4 is a schematic diagram illustrating another example of the process of the instantaneous stop control unit.
FIG. 5 is a schematic diagram illustrating still another example of the process of the instantaneous interruption control unit.
FIG. 6 is a diagram illustrating a specific example of a change in the actual speed of the permanent magnet motor, a change in the estimated speed of the permanent magnet motor, and a change in the DC voltage of the inverter in response to the occurrence of a momentary power failure.
[Explanation of symbols]
1 AC power supply 4 Inverter
5 Permanent magnet motor 10 Second switching unit
17 Voltage detector 18 Momentary power failure controller
18a Instantaneous stop detection unit 19 First switching unit
19a Subtraction unit 19b PI operation unit

Claims (12)

When the permanent magnet motor (5) is driven by supplying the output from the inverter (4) having DC power as input to the permanent magnet motor (5), the magnetic pole position of the rotor is detected, and the detected magnetic pole position is detected. A motor control method for controlling the inverter (4) to control the speed of the permanent magnet motor (5) on the basis of
In response to detecting the momentary power failure of the power supply (1), the speed control is stopped, and the current command value is controlled to a predetermined DC voltage.
Two target voltages of the DC voltage are set, and in response to the DC voltage having reached one of the target voltages, the current command value is set so that the powering operation / regeneration operation is performed according to the reached target voltage. A motor control method characterized by the above-mentioned. The motor control method according to claim 1, wherein the target voltage for the regenerative operation is a voltage that can continue the inverter control during the power running operation and hardly decelerates the permanent magnet motor (5). The motor control method according to claim 1, wherein the current command value during the power running operation is a current value that can estimate a magnetic pole position of the rotor. When the permanent magnet motor (5) is driven by supplying the output from the inverter (4) having DC power as input to the permanent magnet motor (5), the magnetic pole position of the rotor is detected, and the detected magnetic pole position is detected. A motor control method for controlling the inverter (4) to control the speed of the permanent magnet motor (5) on the basis of
In response to detecting the momentary power failure of the power supply (1), the speed control is stopped, and the current command value is controlled to a predetermined DC voltage.
A motor control method comprising: calculating a difference between a target voltage of a DC voltage and a detected DC voltage, performing PI control on the difference, and setting a current command value. When the permanent magnet motor (5) is driven by supplying the output from the inverter (4) having DC power as input to the permanent magnet motor (5), the magnetic pole position of the rotor is detected, and the detected magnetic pole position is detected. A motor control method for controlling the inverter (4) to control the speed of the permanent magnet motor (5) on the basis of
In response to detecting the momentary power failure of the power supply (1), the speed control is stopped, and the current command value is controlled to a predetermined DC voltage.
A motor control method comprising: setting a target voltage of a DC voltage to an inverter maximum limit voltage; and setting a current command value so as to regenerate power when initial kinetic energy is large. The motor control method according to any one of claims 1 to 5, wherein an instantaneous blackout of the power supply (1) is detected in response to a detected value of the DC voltage falling below a predetermined voltage level. When the permanent magnet motor (5) is driven by supplying the output from the inverter (4) having DC power as input to the permanent magnet motor (5), the magnetic pole position of the rotor is detected, and the detected magnetic pole position is detected. A motor control device that controls the inverter (4) to control the speed of the permanent magnet motor (5) on the basis of
Control means (17), (18), (19), (10) for stopping the speed control and controlling the current command value so as to attain a predetermined DC voltage in response to the detection of the momentary interruption of the power supply (1). ),
The control means (18) and (19) set two target voltages of the DC voltage, and in response to the DC voltage having reached one of the target voltages, the powering operation / the regenerative operation according to the target voltage reached. A motor control device for setting a current command value so that The motor control device according to claim 7, wherein the target voltage for the regenerative operation is a voltage that can continue the inverter control during the power running operation and hardly decelerates the permanent magnet motor (5). The motor control device according to claim 7, wherein the current command value during the power running operation is a current value that can estimate a magnetic pole position of the rotor. When the permanent magnet motor (5) is driven by supplying the output from the inverter (4) having DC power as input to the permanent magnet motor (5), the magnetic pole position of the rotor is detected, and the detected magnetic pole position is detected. A motor control device that controls the inverter (4) to control the speed of the permanent magnet motor (5) on the basis of
Control means (17), (18), (19a), (19b) for stopping the speed control and controlling the current command value so as to attain a predetermined DC voltage in response to the detection of the momentary interruption of the power supply (1). ) (10),
The control means (19a) (19b) calculates a difference between the target voltage of the DC voltage and the detected DC voltage, and performs PI control on the difference to set a current command value. Control device. When the permanent magnet motor (5) is driven by supplying the output from the inverter (4) having DC power as input to the permanent magnet motor (5), the magnetic pole position of the rotor is detected, and the detected magnetic pole position is detected. A motor control device that controls the inverter (4) to control the speed of the permanent magnet motor (5) on the basis of
Control means (17), (18), (18a), (19) for stopping the speed control and controlling the current command value so as to attain a predetermined DC voltage in response to the detection of the momentary interruption of the power supply (1). ) (10),
The control means (18) and (19) set a target voltage of the DC voltage to the inverter maximum limit voltage, and set a current command value so as to regenerate power when the initial kinetic energy is large. Motor control device. The control means (18) (18a) detects an instantaneous interruption of the power supply (1) in response to a detected value of the DC voltage falling below a predetermined voltage level. 3. The motor control device according to claim 1.

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