JP3693825B2 - Rotor position detector, sensorless switched reluctance motor rotor position detector, rotor position detecting method, sensorless switched reluctance motor rotor position detecting method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a device for detecting a positional relationship between a stator and a rotor by using a change in inductance of a stator winding, and automatically changes the relative positional relationship between the stator and the rotor even if a motor is changed. The present invention relates to a rotor position detecting device for setting, a rotor position detecting device for a sensorless switched reluctance motor, a rotor position detecting method, and a rotor position detecting method for a sensorless switched reluctance motor.
[0002]
[Prior art]
FIG. 7 shows a configuration diagram of a sensorless SR (switched reluctance) motor driving device including a conventional rotor position detecting device. Reference numeral 1 denotes an SR motor, and 2 denotes a drive circuit for supplying a current for driving the SR motor 1. The SR motor 1 is rotated by the drive current supplied from the drive circuit 2. Reference numeral 3 denotes a control circuit for generating a stator winding excitation signal 4 for sending the timing of the drive current supplied to the stator winding of the SR motor 1 to the drive circuit 2, and usually a microprocessor or the like is used. The timing of the current supplied to the SR motor 1 is created by the control circuit 3.
[0003]
Reference numeral 6 denotes an inductance detection circuit for detecting the stator winding inductance of the SR motor 1. Reference numeral 5 denotes a rotational position detection circuit that detects that the rotor of the SR motor 1 has reached a predetermined position based on a signal from the inductance detection circuit 6 and generates a rotational position detection signal. The control circuit 3 detects that the rotor of the SR motor 1 has reached a predetermined rotational position based on a signal from the rotational position detection circuit 5, and is a fixed drive timing signal that is optimal for the SR motor 1 to rotate smoothly. A child winding excitation signal 4 is generated.
[0004]
FIG. 8 is a diagram showing a positional relationship between a stator and a rotor of a typical SR motor ((a) in FIG. 8) and a change in inductance of the stator winding ((b) in FIG. 8). The stator winding of the SR motor increases in inductance depending on the position of the rotor, and is maximized when the stator salient pole and the rotor salient pole coincide. Further, when the rotor rotates, the inductance decreases and becomes minimum when the stator salient pole and the rotor salient pole are farthest from each other. The SR motor 1 rotates by supplying a current from the drive circuit 2 during a period when the inductance increases (drive torque generation range). In order to supply current in a range where the inductance increases, it is necessary to know the position of the rotor. Since the change in inductance changes linearly after the generation of the drive torque as shown in FIG. 8, the position of the rotor can be estimated by detecting the magnitude of the inductance in this range (the rotational position). range of detection). The magnitude of this inductance is detected by the inductance detection circuit 6, and the rotation position detection circuit 5 compares it with the detection level to detect that the rotor has reached a predetermined rotation position. The control circuit 3 generates a stator winding excitation signal 4 optimum for driving the SR motor 1 from the relationship between the signal from the rotational position detection circuit 5 and a predetermined rotor driving position.
[0005]
Thus, the rotor position can be estimated by detecting the change in inductance of the stator winding, and the SR motor can be driven sensorlessly.
[0006]
[Problems to be solved by the invention]
The conventional rotor position detecting device is configured as described above. However, as shown in FIG. 9, even in the SR motor of the same specification, the inductance of the stator winding varies among individual motors. For this reason, even if the optimum detection level is set for the motor A, when another motor B is connected, the signal from the rotational position detection circuit 5 is shifted from the original position of the rotor due to variations in inductance. Will come out. For this reason, another SR motor does not achieve the optimum drive timing, so that the efficiency is lowered and the worst operation may not be possible.
[0007]
For this reason, it is necessary to individually set the detection level so that the combination of the SR motor and the rotor position detection circuit is optimal.
[0008]
Setting them individually is impractical and very difficult to mass produce. Therefore, if the detection level is set based on the maximum and minimum values of the individual inductances in order to correct variations in the individual stator winding inductances, even if the combination of the SR motor and the rotor position detection device changes. There is no need to reset the detection level.
[0009]
In the rotor position detection device that detects the position of the rotor of the SR motor using the change in inductance, the present invention sets the rotor position detection level from the maximum and minimum values of the inductance, or the maximum value. Rotor position detection device, sensorless switched reluctance motor rotor position detection device, rotor position so as not to affect SR motor drive characteristics even if the combination of SR motor and rotor position detection device changes It is an object of the present invention to obtain a detection method and a rotor position detection method of a sensorless switched reluctance motor.
[0010]
[Means for Solving the Problems]
In view of the above object, the present invention provides a rotor position detection device that detects the position of a rotor with respect to the magnetic salient pole by detecting the magnitude of the winding inductance of a stator having a plurality of magnetic salient poles. Means for detecting the magnitude of the winding inductance of the stator relative to the position of the magnetic salient poles of the stator and the rotor, means for holding the maximum and minimum values of the detected winding inductance, Means for generating a detection level indicating the magnitude of the inductance corresponding to the desired rotor position by multiplying the difference between the maximum value and the minimum value of the inductance by a proportional multiplier, and the magnitude of the winding inductance detected by the detection means And a means for generating a position detection signal when the height reaches the detection level.
[0011]
According to another aspect of the present invention, there is provided a rotor position detecting device for detecting a position of a rotor with respect to the magnetic salient pole by detecting a winding inductance of a stator having a plurality of magnetic salient poles. Means for detecting the magnitude of the winding inductance of the stator relative to the position of the salient pole and the rotor; means for holding the maximum value of the detected winding inductance; and a proportional multiplier to the maximum value of the inductance. Means for generating a detection level indicating the magnitude of the inductance corresponding to the desired rotor position, and a position detection signal when the magnitude of the winding inductance detected by the detection means reaches the detection level. And a means for generating the rotor position detecting device.
[0012]
The present invention also detects the position of the rotor relative to the magnetic salient pole by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles, and the rotor position is within the drive torque generation range. In a rotor position detecting device of a sensorless switched reluctance motor driven by exciting a stator winding for a period of time, a magnetic salient pole of the stator of the motor and a winding inductance of the stator with respect to the position of the rotor The drive torque generation range obtained by multiplying the difference between the maximum value and the minimum value of the inductance by a proportional multiplier; Means for generating a detection level indicating the magnitude of an inductance corresponding to a predetermined rotor position for indicating the winding, and a winding inductor detected by the detection means Means for size of Nsu generates a position detection signal when it reaches the detection level, the rotor position detecting apparatus of sensorless switched reluctance motor, characterized in that with a certain.
[0013]
The present invention also detects the position of the rotor relative to the magnetic salient pole by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles, and the rotor position is within the drive torque generation range. In a rotor position detecting device of a sensorless switched reluctance motor driven by exciting a stator winding for a period of time, a magnetic salient pole of the stator of the motor and a winding inductance of the stator with respect to the position of the rotor Means for detecting the magnitude of the winding, means for holding the maximum value of the detected winding inductance, and a predetermined rotor for indicating the drive torque generation range obtained by multiplying the maximum value of the inductance by a proportional multiplier Means for generating a detection level indicating the magnitude of the inductance corresponding to the position, and the magnitude of the winding inductance detected by the detection means is Means for generating a position detection signal when it reaches the level output, the lying to the rotor position detecting apparatus sensorless switched reluctance motor, characterized in comprising.
[0014]
According to another aspect of the present invention, there is provided a rotor position detection method for detecting a position of a rotor relative to the magnetic salient pole by detecting a magnitude of a winding inductance of a stator having a plurality of magnetic salient poles. Detecting the magnitude of the winding inductance of the stator with respect to the position of the salient pole and the rotor, obtaining the maximum and minimum values of the detected winding inductance, and the maximum value of the inductance; A step of generating a detection level indicating the magnitude of the inductance corresponding to a desired rotor position by multiplying the difference between the minimum values by a proportional multiplier, and the magnitude of the winding inductance detected in the detection step is the detection level And a step of generating a position detection signal when the value reaches the rotor position.
[0015]
According to another aspect of the present invention, there is provided a rotor position detection method for detecting a position of a rotor relative to the magnetic salient pole by detecting a magnitude of a winding inductance of a stator having a plurality of magnetic salient poles. A step of detecting the magnitude of the winding inductance of the stator relative to the position of the salient pole and the rotor, a step of obtaining a maximum value of the detected winding inductance, and a proportional multiplier to the maximum value of the inductance. A step of generating a detection level indicating the magnitude of the inductance corresponding to the desired rotor position, and a position detection signal when the magnitude of the winding inductance detected in the detection step reaches the detection level. And a step of generating the rotor position detecting method.
[0016]
The present invention also detects the position of the rotor relative to the magnetic salient pole by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles, and the rotor position is within the drive torque generation range. In a method for detecting a rotor position of a sensorless switched reluctance motor in which a stator winding is excited and driven for a period of time, a magnetic salient pole of the stator of the motor and a winding inductance of the stator with respect to the position of the rotor The step of detecting the magnitude of the winding, the step of obtaining the maximum and minimum values of the detected winding inductance, and the drive torque generation range obtained by multiplying the difference between the maximum and minimum values of the inductance by a proportional multiplier A step of generating a detection level indicating the magnitude of the inductance corresponding to a predetermined rotor position to indicate the winding, and the winding inductor detected in the detection step The size of Nsu is in process and, sensorless switched reluctance motor rotor position detecting method characterized by comprising a for generating a position detection signal when it reaches the detection level.
[0017]
The present invention also detects the position of the rotor relative to the magnetic salient pole by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles, and the rotor position is within the drive torque generation range. In a method for detecting a rotor position of a sensorless switched reluctance motor in which a stator winding is excited and driven for a period of time, the stator winding magnetic inductance and the stator winding inductance relative to the rotor position A predetermined rotor for indicating the driving torque generation range obtained by multiplying the maximum value of the inductance by a proportional multiplier; A step of generating a detection level indicating the magnitude of the inductance corresponding to the position, and the magnitude of the winding inductance detected in the detection step is A step of generating a position detection signal when it reaches the exit level, the are in sensorless switched rotor position detecting method reluctance motor, characterized in that it includes.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
1 is a block diagram of a sensorless switched reluctance motor driving apparatus including a rotor position detecting apparatus according to Embodiment 1 of the present invention. Reference numeral 1 denotes an SR motor, and 2 denotes a drive circuit for supplying a current for driving the SR motor 1. The SR motor 1 rotates by generating a rotational torque by the drive current supplied from the drive circuit 2. Reference numeral 7 denotes a control circuit for generating a stator winding excitation signal 4 for sending the timing of the drive current supplied to the stator winding of the SR motor 1 to the drive circuit 2, and usually a microprocessor or the like is used. The timing of the current supplied to the SR motor 1 is created by the control circuit 7.
[0019]
Reference numeral 6 denotes an inductance detection circuit for detecting the stator winding inductance of the SR motor 1. Reference numeral 8 denotes an inductance maximum value / minimum value holding circuit for holding the maximum value / minimum value of the stator winding inductance detected by the inductance detection circuit 6. Reference numeral 9 denotes a rotational position detection level generating circuit for generating a detection level corresponding to a predetermined rotational position from the maximum and minimum inductance values held in the inductance maximum / minimum value holding circuit 8. 5 compares the signal of the inductance detection circuit 6 with the detection level from the rotational position detection level generation circuit 9 to detect that the rotor of the SR motor 1 has reached a predetermined position and generates a position detection signal. It is a rotation position detection circuit. The control circuit 7 detects from the signal from the rotational position detection circuit 5 that the rotor of the SR motor 1 has reached a predetermined rotational position, and the SR motor 1 rotates smoothly from the relationship with the rotational position to be driven next. A stator winding excitation signal 4 that is an optimum drive timing signal for generating the signal is generated.
[0020]
FIG. 2 is a diagram for explaining an example of the inductance detection circuit 6 of FIG. 1, and shows a relationship among the inductance detection circuit 6, the drive circuit 2, and the SR motor 1. The transistor 15 is turned on and off by a signal from the step function signal generation circuit 17. When the transistor 15 is turned on, a current flows from the detection power source Vcc 18 to the transistor 15 through the resistor 14 and the stator winding in the SR motor 1. When the transistor 15 is turned on, the voltage V input to the voltage detection circuit 16 is
[0021]
V = Vcc * exp (−R * t · L) (1)
[0022]
It becomes. Here, Vcc is a voltage value of the detection power supply Vcc18 connected to the resistor 14, R is a resistance value of the resistance 14 connected between the detection power supply Vcc18 and the stator winding of the SR motor 1, and t is a transistor. The elapsed time since 15 is turned ON, L is the inductance of the stator winding of the SR motor 1. The voltage detection circuit 16 is a circuit that detects a voltage at an elapsed time t after the transistor 15 is turned on.
[0023]
In FIG. 2, 11a and 11b are transistors, 12a and 12b are diodes for preventing backflow, and 13 is a bus voltage (Vb).
[0024]
Next, an outline of the operation will be described with reference to FIG. First, as shown in FIG. 7 of the related art, the winding inductance of the stator of the SR motor 1 varies depending on the position of the rotor. By detecting the value of the winding inductance, the position of the rotor can be estimated.
[0025]
First, as shown in FIG. 2, by applying a step function voltage to the stator winding of the SR motor 1 via the resistor 14, the voltage expressed by the equation (1) can be obtained. The voltage at the elapsed time t of the voltage is detected by the voltage detection circuit 16. The voltage detected by the voltage detection circuit 16 is compared with a detection level preset by the rotational position detection circuit 5, and a position detection signal is generated when the detection level is reached. The detection level is a voltage corresponding to the winding inductance at a predetermined rotational position. The predetermined rotation position can detect a change in inductance as in the rotation position detection range shown in FIG. 8, and the drive timing is also used to minimize an error in drive timing due to a change in rotation between the detection position and the drive position. A position close to the rotation position is desirable.
[0026]
The control circuit 7 detects from the position detection signal from the rotational position detection circuit 5 that a predetermined rotational position has been reached, and generates a stator winding excitation signal 4 for optimal control of the SR motor 1. Thereby, it is possible to control without a position detection device such as an encoder.
[0027]
The detection level generated by the rotational position detection level generation circuit 9 is adjusted in advance so that the rotor detection position of the SR motor 1 set in the control circuit 7 and the actual rotor position of the SR motor 1 are the same. It is necessary to keep. However, if the combination of the SR motor 1 and the rotor position detection device changes as shown in FIG. 9, a deviation occurs between the rotor position set in advance in the control circuit 7 and the rotor position of the SR motor 1. End up. For this reason, it becomes impossible to drive the SR motor 1 at an optimal drive timing, resulting in a reduction in efficiency and rotational fluctuation.
[0028]
3A shows a change in the stator winding inductance of the SR motor A, FIG. 3B shows a change in the stator winding inductance of the SR motor B, and FIG. 3C shows the difference. As shown in FIG. 3, the stator winding inductance of the SR motor generally varies linearly with the position of the rotor. Here, the detection level is not fixed as shown in FIG. 9, but Ldiff, which is the difference between the maximum value and the minimum value of the stator winding inductance, is obtained from the inductance maximum value / minimum value holding circuit 8 as shown in FIG. The detection level corresponding to the rotor position to be obtained and set in the control circuit 7
[0029]
Detection level = α × Ldiff (0 ≦ α ≦ 1) (2)
[0030]
By setting the proportional multiplier α in advance, the detected position does not change even if the SR motor 1 to be connected is changed from the SR motor A to the SR motor B.
[0031]
FIG. 4 is an explanatory diagram in which the vicinity of the detection position in FIG. 3 is enlarged. The difference between the maximum value and the minimum value of the stator winding inductance of SR motor A is La, the difference between the maximum value and the minimum value of the stator winding inductance of SR motor B is Lb, and the inductance of SR motor A and SR motor B is The difference ratio is β, the SR motor stator winding inductance is the maximum and minimum rotor angle difference θ, the arbitrary detection position is θ1a, θ1b, the SR motor θ1a, θ1b stator winding inductance at When La ′ and Lb ′ are used, respectively, from equation (2)
[0032]
La ′ = α × La (3)
Lb ′ = α × Lb (4)
Lb = β × La (5)
[0033]
It becomes. In general, the change in the stator winding inductance of the SR motor is linear with respect to the rotor position.
[0034]
La ′ / (θ0−θ1a) = La / θ0 (6)
Lb ′ / (θ0−θ1b) = Lb / θ0 (7)
θ1a = θ0 × (1−α) (8)
θ1b = θ0 × (1−α) (9)
[0035]
Thus, θ1a and θ1b are at the same position.
[0036]
Since the maximum and minimum values of the stator winding inductance do not change if the SR motor is fixed, the maximum and minimum inductance values are measured when the combination of the SR motor 1 and the rotor position detection device is determined. If the value is held in the value holding circuit 8, it is not necessary to perform measurement thereafter.
[0037]
In this embodiment, the inductance maximum value / minimum value holding circuit 8 is provided. However, this function may be provided to the control circuit 7 and held in the memory thereof. Further, the detection level is generated from the value that holds the maximum value and the minimum value of the inductance of the inductance maximum value / minimum value holding circuit 8. After the detection level is generated, the detection level is held, and then this value is set. If is used, the maximum and minimum inductance values need not be maintained.
[0038]
In the present embodiment, the voltage detection circuit 16 generates a voltage at an elapsed time t after the transistor 15 is turned on. However, the voltage detection circuit 16 is not used, and the voltage of the expression (1) is used. The rotation position detection circuit 5 may compare the voltage at the elapsed time t with the detection level generated by the rotation position detection level generation circuit 9.
[0039]
In this embodiment, the SR motor is described. However, the present invention can also be used for other motors that detect the position of the rotor by using the magnitude of the inductance of the stator winding.
[0040]
As described above, the SR motor and the rotor position detecting device can be combined without changing the constant of the rotor position detecting device in accordance with the SR motor.
[0041]
Embodiment 2. FIG.
FIG. 5 is a block diagram of a sensorless switched reluctance motor driving apparatus including a rotor position detecting apparatus according to Embodiment 2 of the present invention. In FIG. 5, the same or corresponding parts as those described in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 10 denotes an inductance maximum value holding circuit for holding the maximum value of the stator winding inductance detected by the inductance detection circuit 6.
[0042]
Generally, the minimum value Lmin of the stator winding inductance is a very small value compared to the maximum value Lmax, and as shown in FIG.
[0043]
Lmax≈Lmax−Lmin (10)
[0044]
It can be. For this reason, the detection level corresponding to the predetermined rotor position is set to
[0045]
Detection level = α × Lmax (0 ≦ α ≦ 1) (11)
[0046]
It can be.
[0047]
Since the maximum value of the stator winding inductance does not change if the SR motor is fixed, the maximum value of the stator winding inductance is measured when the combination of the SR motor 1 and the rotor position detection device is determined, and held in the inductance maximum value holding circuit 10. If this is done, there is no need to measure after that.
[0048]
In this embodiment, the inductance maximum value holding circuit 10 is provided, but this function may be provided to the control circuit 7 and held in the memory thereof. Further, the detection level is generated from the value holding the maximum value of the inductance of the inductance maximum value holding circuit 10, but after the detection level is generated, the detection level is held, and if this value is used thereafter, the inductance level It is not necessary to keep the maximum value.
[0049]
In this embodiment, the SR motor is described. However, the present invention can also be used for other motors that detect the position of the rotor by using the magnitude of the inductance of the stator winding.
[0050]
As described above, the SR motor and the rotor position detecting device can be combined without changing the constant of the rotor position detecting circuit in accordance with the SR motor.
[0051]
【The invention's effect】
As described above, according to the present invention, in the rotor position detecting device for detecting the position of the rotor with respect to the magnetic salient pole by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles, Means for detecting the magnitude of the winding inductance of the stator relative to the position of the magnetic salient poles of the stator and the rotor, means for holding the maximum and minimum values of the detected winding inductance, Means for generating a detection level indicating the magnitude of the inductance corresponding to the desired rotor position by multiplying the difference between the maximum value and the minimum value of the inductance by a proportional multiplier, and the magnitude of the winding inductance detected by the detection means And a means for generating a position detection signal when the power reaches the detection level. The rotor can accurately detect the point in the desired relative position with respect to also the stator.
[0052]
According to the invention, in the rotor position detecting device for detecting the position of the rotor with respect to the magnetic salient pole by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles, the stator Means for detecting the magnitude of the winding inductance of the stator with respect to the position of the magnetic salient pole and the rotor, means for holding the maximum value of the detected winding inductance, and proportional to the maximum value of the inductance Means for generating a detection level indicating a magnitude of an inductance corresponding to a desired rotor position multiplied by a multiplier, and position detection when the magnitude of the winding inductance detected by the detection means reaches the detection level; And a means for generating a signal, the rotor position detecting device characterized in that the rotor is positioned relative to the stator for any motor. The point in the in the relative position can be accurately detected.
[0053]
According to the invention, the position of the rotor with respect to the magnetic salient pole is detected by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles, and the rotor position is within the drive torque generation range. In a rotor position detecting device for a sensorless switched reluctance motor in which a stator winding is excited and driven for a period of time, a winding of the stator relative to the position of the magnetic salient pole of the stator of the motor and the rotor Means for detecting the magnitude of the line inductance; means for holding the maximum and minimum values of the detected winding inductance; and the driving torque obtained by multiplying the difference between the maximum and minimum values of the inductance by a proportional multiplier. Means for generating a detection level indicating the magnitude of an inductance corresponding to a predetermined rotor position for indicating the generation range; and a winding impedance detected by the detection means. Means for generating a position detection signal when the magnitude of the ductance reaches the detection level, and the rotor position detection device of the sensorless switched reluctance motor is characterized by including, for example, a manufacturing error Even when the motor and rotor position detection device are combined, the time when the rotor is at the desired relative position with respect to the stator can be detected automatically and accurately, so the combination is easy and the productivity of the motor improves. To do.
[0054]
According to the invention, the position of the rotor with respect to the magnetic salient pole is detected by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles, and the rotor position is within the drive torque generation range. In a rotor position detecting device for a sensorless switched reluctance motor in which a stator winding is excited and driven for a period of time, a winding of the stator relative to the position of the magnetic salient pole of the stator of the motor and the rotor Means for detecting the magnitude of the line inductance; means for holding the maximum value of the detected winding inductance; and a predetermined multiplier for indicating the drive torque generation range obtained by multiplying the maximum value of the inductance by a proportional multiplier. Means for generating a detection level indicating the magnitude of the inductance corresponding to the rotor position, and the magnitude of the winding inductance detected by the detection means; Means for generating a position detection signal when the detection level is reached, and a rotor position detecting device for a sensorless switched reluctance motor, for example, a motor and a rotor position including manufacturing errors. Even when the detection devices are combined, the time when the rotor is at a desired relative position with respect to the stator can be automatically and accurately detected, so that the combination is easy and the productivity of the motor is improved.
[0055]
According to the invention, in the rotor position detecting method for detecting the position of the rotor with respect to the magnetic salient pole by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles, the stator Detecting the magnitude of the winding inductance of the stator with respect to the position of the magnetic salient poles and the rotor, determining the maximum and minimum values of the detected winding inductance, and A step of generating a detection level indicating a magnitude of the inductance corresponding to a desired rotor position by multiplying a difference between the value and the minimum value by a proportional multiplier, and a magnitude of the winding inductance detected in the detection step And a step of generating a position detection signal when the detection level is reached. The rotor can accurately detect the point in the desired relative position with respect to.
[0056]
According to another aspect of the present invention, there is provided a rotor position detection method for detecting a position of a rotor relative to the magnetic salient pole by detecting a magnitude of a winding inductance of a stator having a plurality of magnetic salient poles. A step of detecting the magnitude of the winding inductance of the stator relative to the position of the salient pole and the rotor, a step of obtaining a maximum value of the detected winding inductance, and a proportional multiplier to the maximum value of the inductance. A step of generating a detection level indicating the magnitude of the inductance corresponding to the desired rotor position, and a position detection signal when the magnitude of the winding inductance detected in the detection step reaches the detection level. A rotor position detecting method characterized in that the rotor has a desired phase relative to the stator for any motor. It can accurately detect the point in the position.
[0057]
The present invention also detects the position of the rotor relative to the magnetic salient pole by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles, and the rotor position is within the drive torque generation range. In a method for detecting a rotor position of a sensorless switched reluctance motor in which a stator winding is excited and driven for a period of time, the stator winding magnetic inductance and the stator winding inductance relative to the rotor position The step of detecting the magnitude of the winding, the step of obtaining the maximum and minimum values of the detected winding inductance, and the drive torque generation range obtained by multiplying the difference between the maximum and minimum values of the inductance by a proportional multiplier A step of generating a detection level indicating the magnitude of the inductance corresponding to a predetermined rotor position to indicate the winding, and the winding inductor detected in the detection step A sensorless switched reluctance motor rotor position detecting method characterized by comprising a step of generating a position detection signal when the magnitude of the sensor reaches the detection level. Even when the motor and rotor position detection device are combined, the time when the rotor is at the desired relative position with respect to the stator can be detected automatically and accurately, so the combination is easy and the productivity of the motor improves. To do.
[0058]
The present invention also detects the position of the rotor relative to the magnetic salient pole by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles, and the rotor position is within the drive torque generation range. In a method for detecting a rotor position of a sensorless switched reluctance motor in which a stator winding is excited and driven for a period of time, the stator winding magnetic inductance and the stator winding inductance relative to the rotor position A predetermined rotor for indicating the driving torque generation range obtained by multiplying the maximum value of the inductance by a proportional multiplier; A step of generating a detection level indicating the magnitude of the inductance corresponding to the position, and the magnitude of the winding inductance detected in the detection step is A sensorless switched reluctance motor rotor position detection method characterized by comprising a step of generating a position detection signal when the output level is reached. Even when the devices are combined, the time when the rotor is at a desired relative position with respect to the stator can be automatically and accurately detected, so that the combination is easy and the productivity of the motor is improved.
[Brief description of the drawings]
1 is a configuration diagram of an SR motor drive device including a rotor position detection device according to Embodiment 1 of the present invention;
2 is a configuration diagram of an example of an inductance detection circuit of FIG. 1;
FIG. 3 is a diagram showing a relationship between a stator winding inductance, a detection position, and a detection level according to the first embodiment of the present invention.
FIG. 4 is an enlarged view showing a relationship between a stator winding inductance, a detection position, and a detection level according to the first embodiment of the present invention.
FIG. 5 is a configuration diagram of an SR motor drive device including a rotor position detection device according to Embodiment 2 of the present invention.
FIG. 6 is a diagram showing a relationship between a stator winding inductance, a detection position, and a detection level according to the second embodiment of the present invention.
FIG. 7 is a configuration diagram of an SR motor driving device including a conventional rotor position detecting device.
FIG. 8 is a diagram illustrating a positional relationship between a stator and a rotor of a typical SR motor and a change in inductance of a stator winding.
FIG. 9 is a diagram showing a difference in detection position due to variations in stator winding inductance of a conventional general SR motor.
[Explanation of symbols]
1 SR motor, 2 drive circuit, 4 stator winding excitation signal, 5 rotation position detection circuit, 6 inductance detection circuit, 7 control circuit, 8 inductance maximum value / minimum value holding circuit, 9 rotation position detection level generation circuit, 10 Inductance maximum value holding circuit, 11a, 11b, 15 transistor, 12a, 12b diode, 13 bus voltage, 14 resistance, 16 voltage detection circuit, 17 step function signal generation circuit, 18 detection power supply.

Claims (8)

In the rotor position detecting device for detecting the position of the rotor with respect to the magnetic salient pole by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles,
Means for detecting the magnitude of the winding inductance of the stator relative to the position of the magnetic salient poles of the stator and the rotor;
Means for holding the maximum and minimum values of the detected winding inductance;
Means for generating a detection level indicating a magnitude of the inductance corresponding to a desired rotor position by multiplying the difference between the maximum value and the minimum value of the inductance by a proportional multiplier;
Means for generating a position detection signal when the magnitude of the winding inductance detected by the detection means reaches the detection level;
A rotor position detecting device comprising: In the rotor position detecting device for detecting the position of the rotor with respect to the magnetic salient pole by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles,
Means for detecting the magnitude of the winding inductance of the stator relative to the position of the magnetic salient poles of the stator and the rotor;
Means for holding a maximum value of the detected winding inductance;
Means for generating a detection level indicating a magnitude of the inductance corresponding to a desired rotor position by multiplying the maximum value of the inductance by a proportional multiplier;
Means for generating a position detection signal when the magnitude of the winding inductance detected by the detection means reaches the detection level;
A rotor position detecting device comprising: The position of the rotor with respect to the magnetic salient pole is detected by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles. In the rotor position detecting device of the sensorless switched reluctance motor driven by exciting the wire,
Means for detecting the magnitude of the winding inductance of the stator relative to the position of the magnetic salient poles of the stator of the motor and the rotor;
Means for holding the maximum and minimum values of the detected winding inductance;
Means for generating a detection level indicating a magnitude of the inductance corresponding to a predetermined rotor position for indicating the driving torque generation range by multiplying a difference multiplier between the maximum value and the minimum value of the inductance by a proportional multiplier;
Means for generating a position detection signal when the magnitude of the winding inductance detected by the detection means reaches the detection level;
A rotor position detecting device for a sensorless switched reluctance motor, comprising: The position of the rotor with respect to the magnetic salient pole is detected by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles. In the rotor position detecting device of the sensorless switched reluctance motor driven by exciting the wire,
Means for detecting the magnitude of the winding inductance of the stator relative to the position of the magnetic salient poles of the stator of the motor and the rotor;
Means for holding a maximum value of the detected winding inductance;
Means for generating a detection level indicating the magnitude of the inductance corresponding to a predetermined rotor position for indicating the drive torque generation range obtained by multiplying the maximum value of the inductance by a proportional multiplier;
Means for generating a position detection signal when the magnitude of the winding inductance detected by the detection means reaches the detection level;
A rotor position detecting device for a sensorless switched reluctance motor, comprising: In the rotor position detection method for detecting the position of the rotor with respect to the magnetic salient pole by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles,
Detecting the magnitude of the winding inductance of the stator relative to the position of the magnetic salient poles of the stator and the rotor;
Obtaining a maximum value and a minimum value of the detected winding inductance;
Generating a detection level indicating a magnitude of an inductance corresponding to a desired rotor position by multiplying a difference multiplier between a maximum value and a minimum value of the inductance by a proportional multiplier;
Generating a position detection signal when the magnitude of the winding inductance detected in the detection step reaches the detection level;
A rotor position detection method comprising: In the rotor position detection method for detecting the position of the rotor with respect to the magnetic salient pole by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles,
Detecting the magnitude of the winding inductance of the stator relative to the position of the magnetic salient poles of the stator and the rotor;
Obtaining a maximum value of the detected winding inductance;
Generating a detection level indicating the magnitude of the inductance corresponding to the desired rotor position by multiplying the maximum value of the inductance by a proportional multiplier;
Generating a position detection signal when the magnitude of the winding inductance detected in the detection step reaches the detection level;
A rotor position detection method comprising: The position of the rotor with respect to the magnetic salient pole is detected by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles. In the rotor position detection method of a sensorless switched reluctance motor driven by exciting a wire,
Detecting the magnitude of the winding inductance of the stator relative to the position of the magnetic salient poles of the stator of the motor and the rotor;
Obtaining a maximum value and a minimum value of the detected winding inductance;
Generating a detection level indicating a magnitude of an inductance corresponding to a predetermined rotor position for indicating the driving torque generation range by multiplying a difference between the maximum value and the minimum value of the inductance by a proportional multiplier;
Generating a position detection signal when the magnitude of the winding inductance detected in the detection step reaches the detection level;
A method for detecting the rotor position of a sensorless switched reluctance motor. The position of the rotor with respect to the magnetic salient pole is detected by detecting the magnitude of the winding inductance of the stator having a plurality of magnetic salient poles. In the rotor position detection method of a sensorless switched reluctance motor driven by exciting a wire,
Detecting the magnitude of the winding inductance of the stator relative to the position of the magnetic salient poles of the stator of the motor and the rotor;
Obtaining a maximum value of the detected winding inductance;
Generating a detection level indicating a magnitude of an inductance corresponding to a predetermined rotor position for indicating the driving torque generation range obtained by multiplying the maximum value of the inductance by a proportional multiplier;
Generating a position detection signal when the magnitude of the winding inductance detected in the detection step reaches the detection level;
A method for detecting the rotor position of a sensorless switched reluctance motor.

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