JP6098945B2 - Motor inverter device - Google Patents

Description

  The present invention relates to a motor inverter device that drives a motor with a variable voltage / variable frequency AC output obtained by switching a full-wave rectified output using a single-phase AC power supply as an input.

  FIG. 13 shows a schematic configuration of a conventional motor inverter device. The conventional motor inverter device shown in FIG. 13 has a rectifier circuit 102 that full-wave rectifies the output of the single-phase AC power supply 101, and a variable voltage / variable frequency AC output obtained by switching the rectified output of the rectifier circuit 102. And an inverter 104 for driving the motor 103. Further, the conventional motor inverter device includes a signal generator 105 for generating a PWM signal for turning on / off the switching element of the inverter 104 based on a voltage command value, and the pulse width increase control of the PWM signal. And a control means for performing control for advancing the phase of the inverter output voltage by advancing the output timing of the PWM signal when an inverter output voltage corresponding to the voltage command value cannot be obtained. .

  When the motor 103 is driven by the AC output obtained by switching the pulsating voltage from the rectifier circuit 102 by the inverter 104 in this way, during the period when the instantaneous voltage value of the pulsating voltage is lower than a predetermined level, Even if control is performed to increase the pulse width of the PWM signal, the inverter output voltage corresponding to the voltage command value cannot be obtained. When such a saturation state is reached, that is, when the motor induced voltage becomes higher than the inverter output voltage, the control means 106 controls the output timing of the PWM signal to be advanced to advance the phase of the inverter output voltage. (Phase advance control) is performed (see Patent Document 1).

  When such phase advance control is performed, a phenomenon (field weakening state) in which the terminal voltage of the motor 103 decreases is caused. For this reason, during the period when the terminal voltage of the motor 103 is lowered, the output current from the inverter 104 flows into the motor 103, and this increases the period during which torque is generated. As a result, torque pulsation of the motor 103 is suppressed and its efficiency is improved.

JP-A-10-150795

  In the conventional motor inverter device, when the inverter applied voltage becomes lower than a predetermined level, the output voltage phase of the inverter 104 is advanced and the inverter output is output during the period in which the torque supply from the single-phase AC power supply 101 to the motor 103 is interrupted by the regenerative current. The motor 103 is forcibly supplied with current. For this reason, a current forcibly flows from the inverter output to the motor 103 every half cycle of the single-phase AC power supply 101, the effective current value of the motor 103 increases, and the motor loss increases.

  In particular, in a motor inverter device for a compressor such as an air conditioner in which a stable DC voltage with a sufficiently large smoothing capacitor inserted on the input side of the inverter 104 and a small pulsation is applied to the inverter 104, the operation period of In order to improve efficiency in a long low-speed rotation speed range, it is common to use a motor 103 having a higher induced voltage. In a motor inverter device using such a motor 103, in a motor inverter device in which a single-phase AC power supply 101 is an input and the full-wave rectified output is not sufficiently smoothed, the inverter output is output every half cycle of the single-phase AC power supply 101. The amount of current that is forced to flow from the motor to the motor 103 increases. For this reason, in such a motor inverter apparatus, motor loss increases remarkably.

  Further, in the conventional motor inverter device, the output timing of the PWM signal is advanced, the phase of the inverter output voltage is advanced, and the field weakening control for forcibly flowing the current to the motor 103 is not performed, the single-phase AC power supply 101 The regenerative current flows from the motor 103 every half cycle, and the circuit loss due to the regenerative current increases in the inverter 104 and the capacitor. On the other hand, if the field-weakening control is performed by advancing the phase of the inverter output voltage so as not to generate a regenerative current, a large current is forced to flow to the motor 103, which has a problem that efficiency is deteriorated. . In addition, when the required torque is ensured by intermittently supplying power to the motor 103, the effective current value of the motor 103 increases, so that the motor loss increases. On the other hand, when a motor with a low induced voltage is simply used, there are problems that the inverter loss increases and the output torque is insufficient.

  An object of the present invention is to provide a highly efficient motor inverter device that suppresses the loss of each part including a motor loss while maintaining a motor output torque required for a motor that is a load.

In order to achieve the above object, the motor inverter device of the present invention provides:
A rectifier circuit with a single-phase AC power supply as input,
An inverter that converts the output DC power of the rectifier circuit into AC power;
A control unit for PWM driving control of the inverter;
A resonance frequency is set to 40 times or more of the frequency of the single-phase AC power source, and a reactor arranged on a connection line from the single-phase AC power source to the inverter and a capacitor connected in parallel to the input side of the inverter A configured smoothing section;
A motor that is driven and controlled by the inverter and is a permanent magnet motor including reluctance torque in output torque;
An advance angle adjusting device for adjusting the phase of the PWM control signal output from the control unit,
The advance angle adjusting device is configured such that when the torque from the single-phase AC power source to the motor is interrupted, the regenerative current regenerated from the motor becomes a value within a predetermined range by the advance angle adjustment.

  ADVANTAGE OF THE INVENTION According to this invention, the motor inverter apparatus with high efficiency which suppressed each part loss including motor loss, maintaining the motor output torque required in the motor which is load can be provided.

The figure which shows the schematic structure of the motor inverter apparatus of Embodiment 1 which concerns on this invention in a partial block. The figure which shows schematic structure for demonstrating the voltage and electric current in a motor inverter apparatus. Waveform diagrams of inverter applied voltage waveform Vdc (a), input current waveform Iac (b), and inverter bus current waveform Iinv (c) for explanation in the motor inverter device Schematic configuration diagram showing a state (a) in which a current flows in the “powering state” in the motor inverter device and a state (b) in which a current flows in the “regenerative state” Graph showing magnet torque τm, reluctance torque τr, and total combined output torque τt when current phase angle β is changed in a constant current state Characteristic diagram showing an example of the relationship between the current phase (advance) β and the torque command value Trq * The figure which shows the schematic structure of the motor inverter apparatus of Embodiment 2 which concerns on this invention in a partial block. (A) A figure which shows an example of the waveform of inverter applied voltage Vdc, and an example of the state of (b) adjusted adjustment advance value ((beta)). The figure which shows schematic structure of the motor inverter apparatus of Embodiment 3 which concerns on this invention in a partial block (A) Waveform diagram showing an example of the voltage waveform Vac of the single-phase AC power supply, (b) Diagram showing the applied voltage Vdc to the inverter. The figure which shows schematic structure of the motor inverter apparatus of Embodiment 4 which concerns on this invention in a partial block (A) Waveform diagram showing an example of the inverter applied voltage Vdc, (b) an example of the differential voltage (Vdc−ABS (Vac)) between the inverter applied voltage Vdc and the absolute value ABS (Vac) of the voltage of the single-phase AC power supply. Waveform diagram FIG. 1 is a diagram showing a schematic configuration of a conventional motor inverter device. Part or all of the drawings are drawn in a schematic representation for the purpose of illustration, and the actual relative sizes and positions of the elements shown therein are not necessarily true. Please consider that this is not always the case.

The motor inverter device according to the first aspect of the present invention includes:
A rectifier circuit with a single-phase AC power supply as input,
An inverter that converts the output DC power of the rectifier circuit into AC power;
A control unit for PWM driving control of the inverter;
A resonance frequency is set to 40 times or more of the frequency of the single-phase AC power source, and a reactor arranged on a connection line from the single-phase AC power source to the inverter and a capacitor connected in parallel to the input side of the inverter A configured smoothing section;
A motor that is driven and controlled by the inverter and is a permanent magnet motor including reluctance torque in output torque;
An advance angle adjusting device for adjusting the phase of the PWM control signal output from the control unit,
The advance angle adjusting device is configured such that when the torque from the single-phase AC power source to the motor is interrupted, the regenerative current regenerated from the motor becomes a value within a predetermined range by the advance angle adjustment.

  The motor inverter device according to the first aspect of the present invention configured as described above can suppress the period during which the supply torque from the single-phase AC power supply to the motor is interrupted. That is, an increase in motor current due to intermittent torque supply can be suppressed and motor loss can be suppressed. In addition, by suppressing the regenerative current by utilizing the reluctance torque, it is possible to suppress the charging / discharging of the capacitor due to the regenerative current that does not contribute to the motor drive. It is possible to suppress a decrease in system efficiency.

In the motor inverter device according to the second aspect of the present invention, the advance angle adjusting device according to the first aspect includes:
A current detector for detecting the inverter bus current;
A rotation speed estimation calculation unit that estimates and calculates a motor rotation speed based on a detection value of the current detection unit;
A torque command calculation unit that calculates a torque command value required to drive the motor at the indicated rotation number based on an instruction rotation number for the motor and an estimated rotation number estimated by the rotation number estimation calculation unit;
A voltage phase detector for detecting the voltage phase of the single-phase AC power source or the inverter applied voltage;
An advance angle adjustment unit that performs advance angle adjustment based on information from the current detection unit, the torque command calculation unit, and the voltage phase detection unit,
The advance angle adjustment unit has a period during which a charging current flows from the motor to the capacitor based on a detection value of the current detection unit (regeneration period; torque cutoff period) at an arbitrary motor speed. The torque command value calculated by the torque command calculation unit is set to be substantially the minimum while being set to be less than approximately one quarter of a half cycle.

  In the motor inverter device according to the second aspect of the present invention configured as described above, an inverter based on the regenerative current generated by the influence of the permanent magnet while securing the torque necessary for driving the motor in addition to the magnet torque and the reluctance torque In addition, it is possible to perform motor driving that can suppress the circuit loss in the capacitor and further utilize the reluctance torque to the maximum to suppress the decrease in efficiency.

In the motor inverter device according to the third aspect of the present invention, the advance angle adjusting device according to the first aspect includes
A current detector for detecting the inverter bus current;
A rotation speed estimation calculation unit that estimates and calculates a motor rotation speed based on a detection value of the current detection unit;
A torque command calculation unit that calculates a torque command value required to drive the motor at the indicated rotation number based on an instruction rotation number for the motor and an estimated rotation number estimated by the rotation number estimation calculation unit;
A voltage phase detector for detecting the voltage phase of the single-phase AC power source or the inverter applied voltage;
An advance angle adjustment unit that performs advance angle adjustment based on information from the current detection unit, the torque command calculation unit, and the voltage phase detection unit,
The advance adjustment unit is configured such that an average current value of a charging current flowing from the motor to the capacitor at an arbitrary motor rotation number is a product of a capacitance of the capacitor and an effective voltage value of the single-phase AC power source. The torque command value calculated by the torque command calculation unit is adjusted to be substantially the minimum while being set to be less than the value divided by 10 times the half cycle of the AC power supply.

  In the motor inverter device according to the third aspect of the present invention configured as described above, an inverter based on the regenerative current generated by the influence of the permanent magnet while securing the torque necessary for driving the motor in addition to the magnet torque by the reluctance torque In addition, it is possible to perform motor driving that can suppress the circuit loss in the capacitor and further utilize the reluctance torque to the maximum to suppress the decrease in efficiency.

In the motor inverter device according to the fourth aspect of the present invention, the advance angle adjusting device according to the first aspect includes
A current detector for detecting the inverter bus current;
A rotation speed estimation calculation unit that estimates and calculates a motor rotation speed based on a detection value of the current detection unit;
A torque command calculation unit that calculates a torque command value required to drive the motor at the indicated rotation number based on an instruction rotation number for the motor and an estimated rotation number estimated by the rotation number estimation calculation unit;
A voltage phase detector for detecting the voltage phase of the single-phase AC power source 1 or the inverter applied voltage;
A DC voltage detector for detecting a DC voltage applied to the inverter;
An advance angle adjustment unit that adjusts an advance angle based on information from the torque command calculation unit and the voltage phase detection unit,
The advance angle adjustment unit is set so that an average voltage value detected by the DC voltage detection unit is less than an effective voltage value of the single-phase AC power supply at an arbitrary motor rotation speed, and the torque command calculation unit The torque command value calculated by is adjusted so as to be substantially minimum.

  In the motor inverter device according to the fourth aspect of the present invention configured as described above, an inverter based on the regenerative current generated by the influence of the permanent magnet while securing the torque necessary for driving the motor in addition to the magnet torque by the reluctance torque In addition, it is possible to perform motor driving that can suppress the circuit loss in the capacitor and further utilize the reluctance torque to the maximum to suppress the decrease in efficiency.

In the motor inverter device according to the fifth aspect of the present invention, the advance angle adjusting device according to the first aspect includes
A current detector for detecting the inverter bus current;
A rotation speed estimation calculation unit that estimates and calculates a motor rotation speed based on a detection value of the current detection unit;
A torque command calculation unit that calculates a torque command value required to drive the motor at the indicated rotation number based on an instruction rotation number for the motor and an estimated rotation number estimated by the rotation number estimation calculation unit;
A voltage phase detector for detecting the voltage phase of the single-phase AC power source or the inverter applied voltage;
A DC voltage detector for detecting a DC voltage applied to the inverter;
An AC voltage detector for detecting the voltage of the single-phase AC power supply;
An advance angle adjustment unit that performs advance angle adjustment based on information from the torque command calculation unit, the voltage phase detection unit, the DC voltage detection unit, and the AC voltage detection unit,
The advance adjustment device is configured to calculate a DC voltage value applied to an inverter detected by the DC voltage detection unit and a voltage value of the single-phase AC power source detected by the AC voltage detection unit at an arbitrary motor speed. The average voltage value calculated by the difference from the absolute value calculated based on the torque is set to be less than 10% of the effective voltage value of the single-phase AC power supply, and the torque calculated by the torque command calculation unit The command value is adjusted to be approximately the minimum.

  In the motor inverter device according to the fifth aspect of the present invention configured as described above, an inverter based on the regenerative current generated by the influence of the permanent magnet while securing the torque necessary for driving the motor in addition to the magnet torque and the reluctance torque In addition, it is possible to perform motor driving that can suppress the circuit loss in the capacitor and further utilize the reluctance torque to the maximum to suppress the decrease in efficiency.

In the motor inverter device according to the sixth aspect of the present invention, the advance angle adjusting device according to the first aspect includes
A current detector for detecting the inverter bus current;
A rotation speed estimation calculation unit that estimates and calculates a motor rotation speed based on a detection value of the current detection unit;
A torque command calculation unit that calculates a torque command value required to drive the motor at the indicated rotation number based on an instruction rotation number for the motor and an estimated rotation number estimated by the rotation number estimation calculation unit;
A voltage phase detector for detecting the voltage phase of the single-phase AC power source or the inverter applied voltage;
A DC voltage detector for detecting a DC voltage applied to the inverter;
An AC voltage detector for detecting the voltage of the single-phase AC power supply;
An advance angle adjustment unit that performs advance angle adjustment based on information from the torque command calculation unit, the voltage phase detection unit, the DC voltage detection unit, and the AC voltage detection unit,
The advance angle adjustment unit is configured to obtain a voltage value of the single-phase AC power source detected by the AC voltage detection unit as a DC voltage value applied to an inverter detected by the DC voltage detection unit at an arbitrary motor rotation number. The period larger than the absolute value calculated based on the basic phase is set to be less than about half of the half cycle of the single-phase AC power supply, and the torque command value calculated by the torque command calculation unit is substantially minimized. It has been adjusted.

  In the motor inverter device according to the sixth aspect of the present invention configured as described above, an inverter based on the regenerative current generated by the influence of the permanent magnet while securing the torque necessary for driving the motor in addition to the magnet torque by the reluctance torque In addition, it is possible to perform motor driving that can suppress the circuit loss in the capacitor and further utilize the reluctance torque to the maximum to suppress the decrease in efficiency.

  In the motor inverter device according to the seventh aspect of the present invention, the advance angle adjusting device according to the first to sixth aspects is the advance angle adjusting device is the single-phase AC power source or the inverter applied voltage. The adjustment advance angle amount is changed based on the voltage phase. In the motor inverter device according to the seventh aspect of the present invention configured as described above, the regenerative current is effectively suppressed, the circuit loss in the inverter and the capacitor is suppressed, the torque interruption period is short, and the efficiency reduction is suppressed. The motor can be driven.

  In the motor inverter device according to the eighth aspect of the present invention, the motor according to the first to seventh aspects is for driving a compressor provided in an air conditioner. In the motor inverter device according to the eighth aspect of the present invention configured as described above, the motor inverter device for driving a compressor provided in the air conditioner is used to achieve a small size, light weight, low cost, It is resource-saving and can reduce power consumption throughout the year.

  Hereinafter, a motor inverter device according to an embodiment of the present invention will be described with reference to the accompanying drawings. The present invention is not limited by the specific configuration of the embodiment described below, and is a motor configured based on the technical idea equivalent to the technical idea described in the following embodiment. It includes an inverter device.

(Embodiment 1)
FIG. 1 is a block diagram showing a schematic configuration of a motor inverter device according to a first embodiment of the present invention.
As shown in FIG. 1, the motor inverter device according to the first embodiment includes a rectifier circuit 2 including a diode bridge that receives a single-phase AC power supply 1 and converts the output DC power of the rectifier circuit 2 into AC power. An inverter 4 composed of a plurality of semiconductor switching elements, a control unit 6 such as a microcomputer for controlling the inverter 4 by PWM drive, and a smoothing unit 7 whose resonance frequency is set to 40 times or more of the frequency of the single-phase AC power supply 1 And an advance adjustment device 80 that adjusts the phase of the PWM control signal from the control unit 6. In the motor inverter device of the first embodiment, the smoothing unit 7 includes a reactor 7a disposed on the line of the inverter 4 and the single-phase AC power supply 1, and a capacitor 7b connected in parallel to the input side of the inverter 4. ing. The motor 3 as a load is driven and controlled by the driving power from the inverter 4. The rectifier circuit 2 is a full-wave rectifier circuit.

  The motor inverter device according to the first embodiment is configured using a smoothing unit 7 having a resonance frequency set to 40 times or more of the frequency of the single-phase AC power supply 1 using the single-phase AC power supply 1 as an input power supply. In the motor inverter device of the first embodiment, the pulsating voltage obtained by full-wave rectification of the input of the single-phase AC power supply 1 is switched by performing the minimum smoothing by the smoothing unit 7 having a small capacity. Thus, AC power having a desired frequency for driving the motor is formed. For this reason, the motor inverter device of the first embodiment is configured such that electric power is intermittently supplied to the motor 3.

  In the motor inverter device of the first embodiment, in order to drive the motor 3 with high efficiency, the regenerative current is suppressed so as to be within a predetermined range, and the motor 3 driven under specified conditions within the range. The advance angle adjustment is performed so that a torque command value (Trq *), which will be described later, required in step S1 becomes substantially minimum.

Next, the operation and action of the motor inverter device of the first embodiment configured as described above will be described.
First, when a power supply having a frequency of 50 Hz is used for the single-phase AC power supply 1, the capacitance L1 of the reactor 7a and the capacitance C1 of the capacitor 7b constituting the smoothing unit 7 are resonant to improve the power harmonic current characteristics. The frequency fc = 1 / (2π × √ (L1 × C1)) is set to be 40 times or more of the single-phase AC power supply frequency, that is, 2000 Hz or more. For this reason, for example, by using the reactor 7a having the reactance value L1 = 0.5 mH and the capacitor 7b having the capacitance value C1 = 10 μF, the resonance frequency fc is set to 2000 Hz or more (≈2250 Hz)> (40 × 50 Hz ( Single-phase AC power supply frequency)), (40 × 50 Hz = 2000 Hz). When the reactor 7a and the capacitor 7b constituting the smoothing unit 7 are set to the above values, when the permanent magnet motor is driven by the inverter 4, the inverter applied voltage waveform Vdc, the input current waveform Iac, and the inverter bus current waveform Iinv Is as shown below.

  FIG. 2 is a diagram showing a schematic configuration of the motor inverter device. In the configuration shown in FIG. 2, an inverter applied voltage waveform Vdc, an input current waveform Iac, and an inverter bus current waveform Iinv are shown. FIG. 3 shows respective waveforms of the inverter applied voltage waveform Vdc (FIG. 3A), the input current waveform Iac (FIG. 3B), and the inverter bus current waveform Iinv (FIG. 3C). FIG.

  Here, the half cycle of the single-phase AC power supply 1 is T, the period during which torque is supplied from the single-phase AC power supply 1 to the motor 3 is Ton (torque supply period), and the torque from the single-phase AC power supply 1 to the motor 3 is cut off. Let Toff (torque interruption period) be a period during which regenerative current flows from the motor 3 and the capacitor is charged, Tr (charge period), and Td (discharge period) the period during which the capacitor is discharged to the motor 3.

  FIG. 4 shows a state in which a current flows in the “powering state” in the motor inverter device (FIG. 4A) and a state in which a current flows in the “regenerative state” (FIG. 4B). In the configuration of the motor inverter device of the first embodiment, a state in which torque is supplied from the single-phase AC power source 1 to the motor 3 in the “powering state” shown in FIG. 4A (torque supply period Ton in FIG. 3) The state in which the motor 3 acts as a generator in the “regenerative state” shown in FIG. 4B and charges and discharges the capacitor 7b by the regenerative current generated from the motor 3 (charging period Tr in FIG. 3) It is repeated every half cycle of the single-phase AC power source 1. Since the ratio between the “power running state” and the “regenerative state” depends on the magnitude relationship between the induced voltage of the motor 3 and the applied voltage of the inverter 4, the specifications of the single-phase AC power supply 1 and the motor 3, the motor speed by inverter control, And the advance angle setting state.

  When the regenerative current increases, the charging period Tr and the discharging period Td, that is, the torque cutoff period Toff becomes longer, and the torque supply period Ton becomes shorter. On the other hand, when the regenerative current decreases, the charging period Tr and the discharging period Td, that is, the torque cutoff period Toff becomes shorter, and the torque supply period Ton becomes longer. In such a case where the regenerative current is generated, the torque necessary for driving the motor 3 is intermittently supplied during the limited torque supply period Ton. For this reason, compared with the case where torque can be continuously supplied to the motor 3 without generating the regenerative current, the execution current value of the motor 3 increases when the regenerative current is generated. Loss increases.

  In addition, in the case where torque is intermittently supplied to the motor 3 that rotates at the indicated rotational speed, it is necessary to increase the power during the torque supply period Ton as the torque cutoff period Toff during which torque supply is interrupted becomes longer. The effective current value of the motor 3 increases and the motor loss increases.

  Furthermore, the charging operation to the capacitor 7b by the regenerative current moves waste power energy that does not contribute to motor driving from the motor 3 to the capacitor 7b through the inverter 4. For this reason, when the regenerative current increases, the circuit loss (converter loss, inverter loss) in each of the capacitor (converter) 7b and the inverter 4 also increases.

  In addition, as described above, when the field-weakening control is performed by advancing the phase of the inverter output voltage so as not to generate a regenerative current, a large current is forcibly supplied to the motor 3, resulting in efficiency. Have a problem. For this reason, in order to drive the motor 3 with high efficiency, it is an important condition to control the regenerative current to be within a predetermined range.

  Thus, since the regenerative current greatly affects the converter loss, inverter loss, and motor loss, it is particularly important to suppress the regenerative current within a predetermined range in order to achieve loss suppression of the entire system. It is a problem.

  In the motor inverter device of the first embodiment, the regenerative current regenerated from the motor 3 generated when the advance angle adjusting device 80 interrupts the torque from the single-phase AC power supply 1 to the motor 3 is an advance angle which will be described later. It is configured to be a value within a predetermined range by the adjustment process.

Hereinafter, in the motor inverter device of the first embodiment, a method for adjusting the advance angle β in the advance angle adjusting device 80 for suppressing the regenerative current within a predetermined range will be described.
The influence on the loss due to the regenerative current when the motor is driven includes the torque supply period Ton where torque is supplied from the single-phase AC power supply 1 to the motor 3 and the torque cutoff period where torque from the single-phase AC power supply 1 to the motor 3 is cut off. Depends on the ratio to Toff.

In order to suppress the influence of the increase in loss due to the regenerative current, the torque at which the torque from the single-phase AC power supply 1 to the motor 3 is interrupted at least during the torque supply period Ton where the torque is supplied from the single-phase AC power supply 1 to the motor 3. It is necessary to set longer than the cutoff period Toff (Ton> Toff). Therefore, the advance angle adjusting device 80 detects the torque interruption period Toff, which is the charging period Tr and the discharge period Td, and the torque supply period Ton during which torque is supplied from the single-phase AC power supply 1 to the motor 3 to detect torque. The advance angle β is adjusted so that the supply period Ton becomes longer than the torque cutoff period Toff.
As described above, the loss due to the regenerative current can be suppressed by adjusting the advance angle β so that the torque supply period Ton becomes longer than the torque cutoff period Toff.

  In the motor inverter device of the first embodiment, the motor loss is further suppressed after the loss due to the regenerative current is suppressed as described above. In the motor inverter device according to the first embodiment, as the motor 3, a permanent magnet motor that includes a reluctance torque in its output torque, for example, an IPM is used.

Here, the total output torque of a permanent magnet motor, for example, an IPM motor, that includes reluctance torque in the output torque will be described.
FIG. 5 is a graph showing the magnet torque τm, the reluctance torque τr, and the total combined output torque τt when the current phase angle β is changed while the current is constant. The magnet torque τm is maximum at the current phase angle β = 0 °, and is maximum in the negative direction at the current phase angle β = 180 °. On the other hand, the reluctance torque τr becomes maximum at the current phase angle β = 45, −135 °, and becomes maximum in the minus direction at the current phase angle β = −45 °, 135 °. As a result, the total combined output torque τt is maximum when the current phase is in the range of 0 ° <β <45 °, and is maximum in the minus direction in the range of 135 ° <β <180 °.

  Since the torque and the current phase β have the characteristics as described above, when the motor 3 is driven with a predetermined load and rotation speed, the advance angle (current phase) β adjusted by the advance angle adjusting device 80. FIG. 6 shows an example of the relationship between the torque command value Trq * indicating the torque required to drive the motor 3 at the indicated rotational speed. In FIG. 6, the vertical axis represents the torque command value Trq *, and the horizontal axis represents the advance angle β adjusted by the advance angle adjusting device 80. The torque command value Trq * indicates a torque required to drive the motor 3 at the instructed number of rotations (instructed number of rotations) based on the estimated number of rotations of the motor 3 estimated by the advance angle adjusting device 80.

  In advance angle adjusting device 80 in the motor inverter device of the first embodiment, calculation is performed in advance angle adjusting device 80 in a state in which motor 3 is driven so that the estimated rotational speed of motor 3 is substantially equal to the indicated rotational speed. The advance angle β is adjusted so that the torque command value Trq * is substantially minimized. In FIG. 6, the advance angle β is set to βset where the torque command value Trq * indicates a substantially minimum value. In the advance angle adjusting device 80, as described above, the advance angle β is adjusted so that the torque supply period Ton is longer than the torque cutoff period Toff.

  For example, in FIG. 6, assuming that the adjustable range of the advance angle β necessary for suppressing the loss due to the regenerative current is β> βa, the estimated rotational speed of the motor and the instruction calculated by the advance angle adjusting device 80 In a state where the motor 3 is driven so that the rotation speeds are substantially equal, the advance angle adjusting device 80 adjusts the advance angle β to βset (> βa) so that the torque command value Trq * is substantially minimized.

  Compared with the permanent magnet motor having only the magnet torque (advance angle β = 0 ° at which the total combined output torque is maximum) as described above, the motor inverter device according to the first embodiment has a permanent magnet motor including reluctance torque ( At the advance angle 0 ° <β <45 ° at which the total combined output torque is maximum, the regenerative current can be suppressed while maximizing the motor output by setting the advance angle β to maximize the total combined output torque. . Moreover, in the motor inverter apparatus of Embodiment 1, suppression of the regenerative current by the induced voltage fall by magnet torque reduction can also be expected.

  As described above, in the motor inverter device of the first embodiment, by providing the control unit 6 and the advance angle adjusting device 80, the motor loss is maintained while maintaining the motor output torque required for the motor 3 that is a load. In this way, the motor inverter device is highly efficient with the loss of each part including the above being suppressed.

(Embodiment 2)
Next, a motor inverter device according to a second embodiment of the present invention will be described with reference to the accompanying drawings. The motor inverter device according to the second embodiment more specifically shows the configuration of the advance angle adjusting device 80 in the motor inverter device according to the first embodiment. In the motor inverter device according to the second embodiment, components having substantially the same functions, configurations, and operations as those in the motor inverter device according to the first embodiment are denoted by the same reference numerals, and the descriptions thereof are the same as those in the first embodiment. Apply the description.

FIG. 7 is a partial block diagram showing a schematic configuration of the motor inverter device according to the second embodiment of the present invention.
As shown in FIG. 7, the motor inverter device according to the second embodiment is similar to the motor inverter device according to the first embodiment described above, and includes a rectifier circuit 2 including a diode bridge that receives a single-phase AC power supply 1. An inverter 4 composed of a plurality of semiconductor switch elements that convert the output DC power of the rectifier circuit 2 into AC power, a control unit 6 such as a microcomputer that controls the PWM drive of the inverter 4, and a resonance frequency of a single-phase AC power source 1 is provided with a smoothing unit 7 set to 40 times the frequency of 1 and an advance adjustment device 80 that performs advance adjustment. In the motor inverter device of the second embodiment, the advance angle adjusting device 80 includes an advance angle adjusting device 8 that adjusts the phase of the PWM control signal from the control unit 6, a current detection unit 9 that detects the inverter bus current, A rotation speed estimation calculation unit 10 that estimates and calculates the motor rotation speed based on the detection value of the detection unit 9, and drives the motor 3 at the specified rotation speed based on the estimated rotation speed and the estimated rotation speed estimated by the rotation speed estimation calculation unit 10. A torque command calculation unit 11 for calculating a torque command value necessary for the operation, and a voltage phase detection unit 12 for detecting the voltage phase of the single-phase AC power supply voltage 1 or the inverter applied voltage.

Hereinafter, in the motor inverter device of the second embodiment, a method for adjusting the advance angle β in the advance angle adjusting device 80 for suppressing the regenerative current within a predetermined range will be described.
The effects on the loss due to the regenerative current when the motor is driven are the torque supply period Ton where torque is supplied from the single-phase AC power supply 1 to the motor 3 and the torque cutoff period Toff where the torque from the single-phase AC power supply 1 to the motor 3 is cut off. And depends on the ratio.

  These periods (Ton, Toff) are periods in which the sign of the current value Iinv detected by the current detector 9 that detects the bus current of the inverter 4 is negative, that is, the charging period Tr in which the capacitor 7b is charged by the regenerative current. Can be estimated.

  Assuming that the charging period Tr and the discharging period Td are substantially equal in the charging / discharging period of the capacitor 7b, approximately twice the period Tr charged in the capacitor 7b by the regenerative current is supplied from the single-phase AC power supply 1 to the motor. This corresponds to the period Toff during which is interrupted. In order to suppress the influence of the increase in loss due to the regenerative current, the torque at which the torque from the single-phase AC power supply 1 to the motor 3 is interrupted at least during the torque supply period Ton where the torque is supplied from the single-phase AC power supply 1 to the motor 3 It is necessary to make it longer than the cutoff period Toff (Ton> Toff). Therefore, the advance angle adjustment unit 8 adjusts the advance angle β so that the charging period Tr in which the capacitor 7b is charged by the regenerative current is less than at least a quarter of the half cycle (T / 2) of the single-phase AC power supply 1. (T / 2> 4 (Tr)).

  In the motor inverter device of the second embodiment, the motor loss suppression operation is further performed after the loss due to the regenerative current is suppressed as described above. In the motor inverter device of the second embodiment, as the motor 3, a permanent magnet motor, for example, an IPM, that includes a reluctance torque in its output torque is used. The torque characteristics in the permanent magnet motor including the reluctance torque have been described in the first embodiment.

  Since the motor 3 which is a permanent magnet motor including reluctance torque has torque characteristics as shown in FIG. 5, when the motor 3 is driven at a predetermined load and rotation speed, it is adjusted by the advance angle adjustment unit 8. The relationship between the advance angle β and the torque command value Trq * calculated by the torque command calculation unit 11 is as shown in FIG.

  For example, assuming that the adjustable range of the advance angle β necessary for suppressing the loss due to the regenerative current is β> βa, the estimated rotational speed of the motor 3 calculated by the rotational speed estimation calculation unit 10 and the torque command In a state where the motor 3 is driven so that the indicated rotational speeds input from the outside to the calculation unit 11 are substantially equal, the advance angle adjustment unit 8 is a torque command value Trq calculated by the torque command calculation unit 11. The advance angle β is adjusted to βset (> βa) so that * becomes substantially minimum.

  Compared with the permanent magnet motor having only the magnet torque as described above (advance angle β = 0 ° at which the total combined output torque is maximum), the motor inverter device according to the second embodiment has a permanent magnet motor including reluctance torque ( At the advance angle 0 ° <β <45 ° at which the total combined output torque is maximum, the regenerative current can be suppressed while maximizing the motor output by setting the advance angle to maximize the total combined output torque. Moreover, in the motor inverter apparatus of Embodiment 2, suppression of the regenerative current by the induced voltage fall by magnet torque reduction can also be expected.

  In the motor inverter device according to the second embodiment, the advance angle β is adjusted by the advance angle adjusting unit 8 regardless of the power phase θ of the single-phase AC power source 1 detected by the voltage phase detecting unit 12. You may adjust so that you may change. 8A shows an example of the waveform of the inverter applied voltage Vdc that is in phase with the power supply phase θ of the single-phase AC power supply 1, and FIG. 8B shows the adjusted advance value (β). It is a figure which shows the example of a state.

  The advance angle β adjusted by the advance angle adjusting unit 8 is a constant advance value regardless of the power supply phase θ of the single-phase AC power supply 1, as indicated by the adjustment advance value β1 in FIG. You may adjust so that it may become.

  Further, the advance angle β adjusted by the advance angle adjusting unit 8 is shown in FIG. 8B in order to more effectively suppress the regenerative current from the motor 3 and maximize the motor output torque utilizing the reluctance torque. ), The adjustment advance angle value β (θ) may be changed by changing the adjustment width (advance angle β2 · phase θa) of the adjustment advance angle β in accordance with the power supply phase θ.

  For example, the adjustment advance value β1 that is constant regardless of the power supply phase θ of the single-phase AC power supply 1 detected by the voltage phase detection unit 12, and the power supply phase of the single-phase AC power supply 1 detected by the voltage phase detection unit 12 It may be a combined value of the adjustment advance value β2 that increases or decreases according to θ and the adjustment advance value β (θ) that pulsates with the adjustment width phase value θa. In particular, when the advance angle setting value necessary for suppressing the regenerative current and the advance angle setting value necessary for maximizing the motor output torque are greatly different, the above advance angle adjustment method (β (θ)) is effective. Works.

  As described above, in the motor inverter device of the second embodiment, by providing the control unit 6 and the advance angle adjusting device 80, the motor loss is maintained while maintaining the motor output torque required for the motor 3 as a load. In this way, the motor inverter device is highly efficient with the loss of each part including the above being suppressed.

(Embodiment 3)
Next, a motor inverter device according to a third embodiment of the present invention will be described with reference to the accompanying drawings. The motor inverter device according to the third embodiment more specifically shows the configuration of the advance angle adjusting device 80 in the motor inverter device according to the first embodiment. In the motor inverter device according to the third embodiment, components having substantially the same functions, configurations, and operations as those in the motor inverter devices according to the first and second embodiments are denoted by the same reference numerals, and the description thereof will be omitted. The description of Embodiment 1 and Embodiment 2 is applied.

FIG. 9 is a block diagram showing a schematic configuration of the motor inverter device according to the third embodiment of the present invention.
As shown in FIG. 9, the motor inverter device according to the third embodiment is similar to the motor inverter device according to the first embodiment described above, and includes a rectifier circuit 2 including a diode bridge that receives a single-phase AC power supply 1. An inverter 4 composed of a plurality of semiconductor switch elements that convert the output DC power of the rectifier circuit 2 into AC power, a control unit 6 such as a microcomputer that controls the PWM drive of the inverter 4, and a resonance frequency of a single-phase AC power source 1 is provided with a smoothing unit 7 set to 40 times the frequency of 1 and an advance adjustment device 80 that performs advance adjustment. In the motor inverter device of the second embodiment, the advance angle adjusting device 80 includes an advance angle adjusting device 8 that adjusts the phase of the PWM control signal from the control unit 6, a current detection unit 9 that detects the inverter bus current, A rotation speed estimation calculation unit 10 that estimates and calculates the motor rotation speed based on the detection value of the detection unit 9, and drives the motor 3 at the specified rotation speed based on the estimated rotation speed and the estimated rotation speed estimated by the rotation speed estimation calculation unit 10. A torque command calculation unit 11 for calculating a torque command value necessary for the operation, a voltage phase detection unit 12 for detecting the voltage phase of the single-phase AC power supply voltage 1 or the inverter applied voltage, and a DC voltage applied to the inverter 4. DC voltage detecting means 13 for detecting. In the motor inverter device according to the third embodiment, as the motor 3, a permanent magnet motor that includes a reluctance torque in its output torque, for example, an IPM is used.

Hereinafter, in the motor inverter device of the third embodiment, a method for adjusting the advance angle β in the advance angle adjusting device 80 for suppressing the regenerative current within a predetermined range will be described.
The influence on the loss due to the regenerative current at the time of driving the motor also depends on the current amount of the regenerative current, that is, the amount of charge charged in the capacitor 7b every half cycle T of the single-phase AC power supply 1. This amount of charge can be estimated from the capacitance C of the capacitor 7b and the average value Vdc (av) of the DC voltage value Vdc detected by the DC voltage detector 13 that detects the voltage applied to the inverter 4.

FIG. 10A is a waveform diagram showing an example of the voltage waveform Vac of the single-phase AC power supply 1, and FIG. 10B shows the voltage Vdc applied to the inverter.
When the capacitor 7b is not charged by the regenerative current, the DC voltage value Vdc applied to the inverter 4 is substantially equal to the absolute value ABS (Vac) of the single-phase AC power supply 1. That is, as shown in FIG. 10A, if the voltage waveform Vac of the single-phase AC power supply 1 is a sinusoidal waveform having a peak value Vmax (= √ (2) * Ve) and an effective value Ve, the inverter 4 The applied DC voltage waveform Vdc is an absolute value waveform as shown in FIG. Therefore, the average voltage value Vdc (av) is (2√2 * Ve) / π, which is approximately 90% of the effective voltage value Ve.

  On the other hand, when the capacitor 7b is charged by the regenerative current, the voltage waveform Vdc applied to the inverter 4 is different from the sinusoidal waveform as shown in FIG. Becomes a deformed waveform. In the waveform shown in FIG. 3A, the shaded portion is the voltage generated by charging the capacitor 7b with the regenerative current. Therefore, the average voltage value Vdc (av) (1) at this time is larger than the average voltage value Vdc (av) (= (2√2 * Ve) / π) shown in FIG. Therefore, the amount of charge charged in the capacitor 7b by the regenerative current can be estimated by detecting the average value of the capacitor capacitance C and the inverter applied voltage Vdc (Vdc (av) (1) −Vdc (av)).

  In order to suppress the influence of the increase in loss due to the regenerative current, the inventor at least increases the average voltage value Vdc (av) detected by the DC voltage detector 13 by approximately 10% of (2√2 * Ve) / π. It has been found that it needs to be less than, that is, substantially less than the effective voltage value Ve. Therefore, the average voltage value Vdc (av) (1) of the inverter applied voltage Vdc considering the charging voltage to the capacitor by the regenerative current shown in FIG. 3A is less than the substantially effective voltage value Ve of the single-phase AC power supply 1 ( The advance angle β is adjusted by the advance angle adjustment unit 8 so that Vdc (av) (1) <Ve).

  Furthermore, limiting the average voltage value Vav by charging the capacitor C of the capacitor C with the regenerative current to be less than about 10% of the effective voltage value Ve of the single-phase AC power supply 1 is a current detection for detecting the bus current of the inverter 4. The product of the capacitor C and the effective voltage value Ve of the single-phase AC power supply 1 is 10 times the single-phase AC power supply half cycle T. The average current value Iinv (av) in which the sign of the current value Iinv detected by the unit 9 is negative. (Iinv (av) <(C * Ve / 10T)). Therefore, the advance angle β is adjusted by the advance angle adjusting unit 8 so that Iinv (av) <(C * Ve / 10T).

  In the motor inverter device according to the third embodiment, the motor loss suppressing operation described in the second embodiment is further performed after suppressing the loss due to the regenerative current as described above.

  As described above, in the motor inverter device of the third embodiment, by providing the control unit 6 and the advance angle adjusting device 80, the motor loss is maintained while maintaining the motor output torque required for the motor 3 as a load. In this way, the motor inverter device is highly efficient with the loss of each part including the above being suppressed.

(Embodiment 4)
Next, a motor inverter device according to a fourth embodiment of the present invention will be described with reference to the accompanying drawings. The motor inverter device of the fourth embodiment more specifically shows the configuration of the advance angle adjusting device 80 in the motor inverter device of the first embodiment. In the motor inverter device according to the fourth embodiment, components having substantially the same functions, configurations, and operations as those in the motor inverter device according to the first to third embodiments are denoted by the same reference numerals, and the description thereof will be omitted. The description of Embodiment 1 to Embodiment 3 is applied.

FIG. 11 is a partial block diagram showing the schematic configuration of the motor inverter device according to the fourth embodiment of the present invention.
As shown in FIG. 11, the motor inverter device according to the fourth embodiment is similar to the motor inverter device according to the first embodiment described above, and includes a rectifier circuit 2 including a diode bridge that receives a single-phase AC power supply 1 as an input. An inverter 4 composed of a plurality of semiconductor switch elements that convert the output DC power of the rectifier circuit 2 into AC power, a control unit 6 such as a microcomputer that controls the PWM drive of the inverter 4, and a resonance frequency of a single-phase AC power source 1 is provided with a smoothing unit 7 set to 40 times the frequency of 1 and an advance adjustment device 80 that performs advance adjustment. In the motor inverter device of the second embodiment, the advance angle adjusting device 80 includes an advance angle adjusting device 8 that adjusts the phase of the PWM control signal from the control unit 6, a current detection unit 9 that detects the inverter bus current, A rotation speed estimation calculation unit 10 that estimates and calculates the motor rotation speed based on the detection value of the detection unit 9, and drives the motor 3 at the specified rotation speed based on the estimated rotation speed and the estimated rotation speed estimated by the rotation speed estimation calculation unit 10. A torque command calculation unit 11 for calculating a torque command value necessary for the operation, a voltage phase detection unit 12 for detecting the voltage phase of the single-phase AC power supply voltage 1 or the inverter applied voltage, and a DC voltage applied to the inverter 4. DC voltage detecting means 13 for detecting and AC voltage detecting means 14 for detecting a single-phase AC power supply voltage are provided. In the motor inverter device according to the fourth embodiment, as the motor 3, a permanent magnet motor that includes a reluctance torque in its output torque, for example, an IPM is used.

Hereinafter, in the motor inverter device of the fourth embodiment, a method for adjusting the advance angle β in the advance angle adjusting device 80 for suppressing the regenerative current within a predetermined range will be described.
The effects on the loss due to the regenerative current when the motor is driven are the torque supply period Ton where torque is supplied from the single-phase AC power supply 1 to the motor 3 and the torque cutoff period Toff where the torque from the single-phase AC power supply 1 to the motor 3 is cut off. And depends on the ratio.

  During these periods (Ton, Toff), the DC voltage value Vdc detected by the DC voltage detector 13 that detects the voltage applied to the inverter 4 and the AC voltage detector 14 that detects the voltage of the single-phase AC power supply 1. The absolute value ABS (Vac) of the AC voltage detected by the above is compared, and the period of Vdc> ABS (Vac) corresponds to the period Toff in which the torque from the single-phase AC power supply 1 to the motor 3 is interrupted.

  Therefore, in order to suppress the influence of the increase in loss due to the regenerative current, the torque from the single-phase AC power supply 1 to the motor 3 is interrupted at least during the torque supply period Ton during which torque is supplied from the single-phase AC power supply 1 to the motor 3. The advance angle β is set by the advance angle adjustment unit 8 so that the torque cutoff period Toff is longer (Ton> Toff), that is, the period in which Vdc> ABS (Vac) is less than half of the half cycle T of the single-phase AC power supply 1. adjust.

  Further, as described in the third embodiment, the influence on the loss due to the regenerative current when the motor is driven is charged to the capacitor 7b for each regenerative current amount, that is, every half cycle T of the single-phase AC power supply 1. It also depends on the amount of charge. This amount of charge can be estimated from the capacitance C of the capacitor 7b and the average value Vdc (av) of the DC voltage value Vdc detected by the DC voltage detector 13 that detects the voltage applied to the inverter 4.

  Further, the amount of charge charged in the capacitor 7b by the regenerative current can be estimated by another means. The amount of charge charged in the capacitor 7b is determined by the capacitance C of the capacitor 7b, the DC voltage value Vdc detected by the DC voltage detector 13 that detects the voltage applied to the inverter 4, and the voltage of the single-phase AC power source 1. It can be estimated from the differential voltage value with the absolute value ABS (Vac) of the AC voltage detected by the AC voltage detection unit 14 to be detected.

  12A is a waveform diagram showing an example of the inverter applied voltage Vdc in consideration of the charging voltage to the capacitor 7b due to the regenerative current. FIG. 12B shows the waveform of the inverter applied voltage Vdc and the single-phase AC power source 1. It is a wave form diagram which shows the example of the difference voltage (Vdc-ABS (Vac)) with the absolute value ABS (Vac) of a voltage.

  In order to suppress the influence of the increase in loss due to the regenerative current, the inventor must at least calculate the difference average value Vav (= (Vdc−ABS (Vac)) between the inverter applied voltage and the absolute value of the AC voltage of the single-phase AC power supply 1. It was found that the average value of the single-phase AC power supply 1 must be less than 10% of the effective voltage value Ve of the single-phase AC power supply 1 (10 * Vav (1) <Ve).

  Therefore, the average value Vav of the difference (Vdc−ABS (Vac)) between the inverter applied voltage Vdc and the absolute value ABS (Vac) of the single-phase AC power supply voltage shown in FIG. The advance angle β is adjusted by the advance angle adjustment unit 8 so that the voltage value Ve is less than approximately 10% (10 * Vav (1) <Ve). Here, the average value Vav (1) is an exemplary calculation.

  In the motor inverter device of the fourth embodiment, the motor loss suppression operation described in the above-described second embodiment is further performed after suppressing the loss due to the regenerative current as described above.

  As described above, in the motor inverter device of the fourth embodiment, by providing the control unit 6 and the advance angle adjusting device 80, while maintaining the motor output torque required for the motor 3 as a load, the motor loss In this way, the motor inverter device is highly efficient with the loss of each part including the above being suppressed.

  In the configuration of each embodiment described above, the case where the insertion position of the reactor 7a is on the single-phase AC power supply side from the rectifier circuit 2 has been described. However, the present invention is not limited to such a configuration. However, even if it is inserted on the inverter side (between the rectifier circuit 2 and the capacitor), the same effect is obtained and there is no problem.

  Further, in the configuration of each of the above-described embodiments, the method of adjusting the advance angle in inverter control has been described for reducing the loss of the entire motor inverter device by suppressing the regenerative current. However, the induced voltage, magnet torque, and reluctance torque in the motor have been described. It is also important to adjust the motor specifications to be used, such as the ratio, in advance.

  Although the present invention has been described in each embodiment with a certain degree of detail, the disclosure content of these embodiments should be changed in details of the configuration, and the combination and order of elements in each embodiment should be changed. Changes may be made without departing from the scope and spirit of the claimed invention.

  In addition, the various advance angle adjustment methods in the advance angle adjustment device 80 described in each embodiment can be used in appropriate combination, and by providing a plurality of advance angle adjustment methods, the advance in the motor inverter device of the present invention can be achieved. The angle adjustment can be made more reliable.

  As described above, in the motor inverter device of the present invention, a permanent magnet motor including a reluctance torque in the output torque is used as the motor.

  In the motor inverter device of the present invention, at any motor rotation speed, the advance angle adjustment device performs various advance angle adjustments shown below to maintain the motor output torque required in the motor inverter device, while maintaining the motor loss. It is possible to perform highly efficient drive control on the motor that is a load, which can suppress the loss of each part including the above.

In the advance angle adjusting device in the present invention, at an arbitrary motor rotational speed,
(1) Advancing adjustment in which the charging period (Tr) in which the charging current flows from the motor to the capacitor based on the detection value of the current detection unit is less than about a quarter of the half cycle (T / 2) of the single-phase AC power supply Processing; T / 2> 4Tr: or
(2) The average regenerative current value (Iinv (av)) based on the detection value of the current detection unit is the product of the capacitor capacity (C) and the effective voltage value (Ve) of the single-phase AC power supply. Advance angle adjustment processing to be less than a value divided by 10 times the half cycle (T / 2); Iinv (av) <(C * Ve / 10T):
(3) Lead angle adjustment processing in which the average voltage value detected by the DC voltage detection unit is less than the effective voltage value of the single-phase AC power supply; (Vdc (av) <Ve): or (4) Detection by the DC voltage detection unit The average voltage value calculated by the difference between the DC voltage value applied to the inverter and the absolute value calculated based on the voltage value of the single-phase AC power source detected by the AC voltage detector is a single-phase AC power source. (10 * Vav <Ve): or (5) The DC voltage value applied to the inverter detected by the DC voltage detector is detected by the AC voltage detector. The advance angle adjustment process is performed so that the period of time greater than the absolute value calculated based on the voltage value of the single-phase AC power supply is less than about half of the half cycle of the single-phase AC power supply.

  Furthermore, in the advance angle adjusting device according to the present invention, the advance angle adjustment is performed so that the torque command value (Trq *), which is the required torque, is substantially minimized on the condition that the at least one advance angle adjustment process is performed. Thus, it is possible to configure a highly efficient motor inverter device that suppresses the loss of each part including the motor loss while maintaining the motor output torque required for the motor 3 that is the load.

  As described above, in the motor inverter device of the present invention, by using a reluctance torque motor capable of suppressing the regenerative current without reducing the motor output torque, the sum of converter loss, inverter loss, and motor loss is obtained. It is possible to suppress an increase in system loss. That is, the motor inverter device of the present invention can suppress a decrease in efficiency due to the regenerative current.

  In the present invention, by using the reluctance torque motor to adjust the advance angle so as to realize the regenerative current suppression and the motor output torque maximization, it is possible to realize a system that most suppresses the reduction in the efficiency of the entire motor inverter device. .

  In the present invention, it is possible to suppress the influence of the regenerative current while maintaining the required maximum torque, and in particular, it is possible to improve the efficiency in the low-speed rotation speed region where the influence of the regenerative current is small. It is a highly versatile device that can be applied to the compressor motor drive of air conditioners and refrigerators that are used in such a way that the motor drive at a low rotation speed occupies most of the operation period although the change width is large. is there.

DESCRIPTION OF SYMBOLS 1 Single-phase alternating current power supply 2 Rectifier circuit 3 Motor 4 Inverter 5 Signal generation part 6 Control part 7 Smoothing part 8 Lead angle adjustment part 9 Current detection part 10 Rotation speed estimation calculation part 11 Torque command calculation part 12 Voltage phase detection part 13 DC voltage Detector 14 AC voltage detector 80 Lead angle adjustment device

Claims (7)

A rectifier circuit with a single-phase AC power supply as input,
An inverter that converts the output DC power of the rectifier circuit into AC power;
A control unit for PWM driving control of the inverter;
A resonance frequency is set to 40 times or more of the frequency of the single-phase AC power source, and a reactor arranged on a connection line from the single-phase AC power source to the inverter and a capacitor connected in parallel to the input side of the inverter A configured smoothing section;
A motor that is driven and controlled by the inverter and is a permanent magnet motor including reluctance torque in output torque;
An advance angle adjusting device for adjusting the phase of the PWM control signal output from the control unit,
The advance angle adjustment device is configured such that a regenerative current regenerated from the motor when the torque from the single-phase AC power supply to the motor is interrupted becomes a value within a predetermined range by advance angle adjustment ,
The advance angle adjusting device includes:
A current detector for detecting the inverter bus current;
A rotation speed estimation calculation unit that estimates and calculates a motor rotation speed based on a detection value of the current detection unit;
A torque command calculation unit that calculates a torque command value required to drive the motor at the indicated rotation number based on an instruction rotation number for the motor and an estimated rotation number estimated by the rotation number estimation calculation unit;
A voltage phase detector for detecting the voltage phase of the single-phase AC power source or the inverter applied voltage;
An advance angle adjustment unit that performs advance angle adjustment based on information from the current detection unit, the torque command calculation unit, and the voltage phase detection unit,
The advance angle adjustment unit has a period during which a charging current flows from the motor to the capacitor based on a detection value of the current detection unit (regeneration period; torque cutoff period) at an arbitrary motor speed. A motor inverter device that is set to be less than approximately one-fourth of a half cycle and adjusted so that the torque command value calculated by the torque command calculation unit is substantially minimum . A rectifier circuit with a single-phase AC power supply as input,
An inverter that converts the output DC power of the rectifier circuit into AC power;
A control unit for PWM driving control of the inverter;
A resonance frequency is set to 40 times or more of the frequency of the single-phase AC power source, and a reactor arranged on a connection line from the single-phase AC power source to the inverter and a capacitor connected in parallel to the input side of the inverter A configured smoothing section;
A motor that is driven and controlled by the inverter and is a permanent magnet motor including reluctance torque in output torque;
An advance angle adjusting device for adjusting the phase of the PWM control signal output from the control unit,
The advance angle adjustment device is configured such that a regenerative current regenerated from the motor when the torque from the single-phase AC power supply to the motor is interrupted becomes a value within a predetermined range by advance angle adjustment,
The advance angle adjusting device includes:
A current detector for detecting the inverter bus current;
A rotation speed estimation calculation unit that estimates and calculates a motor rotation speed based on a detection value of the current detection unit;
A torque command calculation unit that calculates a torque command value required to drive the motor at the indicated rotation number based on an instruction rotation number for the motor and an estimated rotation number estimated by the rotation number estimation calculation unit;
A voltage phase detector for detecting the voltage phase of the single-phase AC power source or the inverter applied voltage;
An advance angle adjustment unit that performs advance angle adjustment based on information from the current detection unit, the torque command calculation unit, and the voltage phase detection unit,
The advance adjustment unit is configured such that an average current value of a charging current flowing from the motor to the capacitor at an arbitrary motor rotation number is a product of a capacitance of the capacitor and an effective voltage value of the single-phase AC power source. while being set to be smaller than a value obtained by dividing the 10 times value of the half cycle of the AC power source, the torque command motors inverter device wherein the torque command value calculated is adjusted to be substantially minimized by computing unit. A rectifier circuit with a single-phase AC power supply as input,
An inverter that converts the output DC power of the rectifier circuit into AC power;
A control unit for PWM driving control of the inverter;
A resonance frequency is set to 40 times or more of the frequency of the single-phase AC power source, and a reactor arranged on a connection line from the single-phase AC power source to the inverter and a capacitor connected in parallel to the input side of the inverter A configured smoothing section;
A motor that is driven and controlled by the inverter and is a permanent magnet motor including reluctance torque in output torque;
An advance angle adjusting device for adjusting the phase of the PWM control signal output from the control unit,
The advance angle adjustment device is configured such that a regenerative current regenerated from the motor when the torque from the single-phase AC power supply to the motor is interrupted becomes a value within a predetermined range by advance angle adjustment,
The advance angle adjusting device includes:
A current detector for detecting the inverter bus current;
A rotation speed estimation calculation unit that estimates and calculates a motor rotation speed based on a detection value of the current detection unit;
A torque command calculation unit that calculates a torque command value required to drive the motor at the indicated rotation number based on an instruction rotation number for the motor and an estimated rotation number estimated by the rotation number estimation calculation unit;
A voltage phase detector for detecting the voltage phase of the single-phase AC power source 1 or the inverter applied voltage;
A DC voltage detector for detecting a DC voltage applied to the inverter;
An advance angle adjustment unit that adjusts an advance angle based on information from the torque command calculation unit and the voltage phase detection unit,
The advance angle adjustment unit is set so that an average voltage value detected by the DC voltage detection unit is less than an effective voltage value of the single-phase AC power supply at an arbitrary motor rotation speed, and the torque command calculation unit motor inverter device wherein the torque command value calculated is adjusted to be substantially minimized by. A rectifier circuit with a single-phase AC power supply as input,
An inverter that converts the output DC power of the rectifier circuit into AC power;
A control unit for PWM driving control of the inverter;
A resonance frequency is set to 40 times or more of the frequency of the single-phase AC power source, and a reactor arranged on a connection line from the single-phase AC power source to the inverter and a capacitor connected in parallel to the input side of the inverter A configured smoothing section;
A motor that is driven and controlled by the inverter and is a permanent magnet motor including reluctance torque in output torque;
An advance angle adjusting device for adjusting the phase of the PWM control signal output from the control unit,
The advance angle adjustment device is configured such that a regenerative current regenerated from the motor when the torque from the single-phase AC power supply to the motor is interrupted becomes a value within a predetermined range by advance angle adjustment,
The advance angle adjusting device includes:
A current detector for detecting the inverter bus current;
A rotation speed estimation calculation unit that estimates and calculates a motor rotation speed based on a detection value of the current detection unit;
A torque command calculation unit that calculates a torque command value required to drive the motor at the indicated rotation number based on an instruction rotation number for the motor and an estimated rotation number estimated by the rotation number estimation calculation unit;
A voltage phase detector for detecting the voltage phase of the single-phase AC power source or the inverter applied voltage;
A DC voltage detector for detecting a DC voltage applied to the inverter;
An AC voltage detector for detecting the voltage of the single-phase AC power supply;
An advance angle adjustment unit that performs advance angle adjustment based on information from the torque command calculation unit, the voltage phase detection unit, the DC voltage detection unit, and the AC voltage detection unit,
The advance adjustment device is configured to calculate a DC voltage value applied to an inverter detected by the DC voltage detection unit and a voltage value of the single-phase AC power source detected by the AC voltage detection unit at an arbitrary motor speed. The average voltage value calculated by the difference from the absolute value calculated based on the torque is set to be less than 10% of the effective voltage value of the single-phase AC power supply, and the torque calculated by the torque command calculation unit motor inverter device command value is adjusted to be substantially minimized. A rectifier circuit with a single-phase AC power supply as input,
An inverter that converts the output DC power of the rectifier circuit into AC power;
A control unit for PWM driving control of the inverter;
A resonance frequency is set to 40 times or more of the frequency of the single-phase AC power source, and a reactor arranged on a connection line from the single-phase AC power source to the inverter and a capacitor connected in parallel to the input side of the inverter A configured smoothing section;
A motor that is driven and controlled by the inverter and is a permanent magnet motor including reluctance torque in output torque;
An advance angle adjusting device for adjusting the phase of the PWM control signal output from the control unit,
The advance angle adjustment device is configured such that a regenerative current regenerated from the motor when the torque from the single-phase AC power supply to the motor is interrupted becomes a value within a predetermined range by advance angle adjustment,
The advance angle adjusting device includes:
A current detector for detecting the inverter bus current;
A rotation speed estimation calculation unit that estimates and calculates a motor rotation speed based on a detection value of the current detection unit;
A torque command calculation unit that calculates a torque command value required to drive the motor at the indicated rotation number based on an instruction rotation number for the motor and an estimated rotation number estimated by the rotation number estimation calculation unit;
A voltage phase detector for detecting the voltage phase of the single-phase AC power source or the inverter applied voltage;
A DC voltage detector for detecting a DC voltage applied to the inverter;
An AC voltage detector for detecting the voltage of the single-phase AC power supply;
An advance angle adjustment unit that performs advance angle adjustment based on information from the torque command calculation unit, the voltage phase detection unit, the DC voltage detection unit, and the AC voltage detection unit,
The advance angle adjustment unit is configured to obtain a voltage value of the single-phase AC power source detected by the AC voltage detection unit as a DC voltage value applied to an inverter detected by the DC voltage detection unit at an arbitrary motor rotation number. The period larger than the absolute value calculated based on the basic phase is set to be less than about half of the half cycle of the single-phase AC power supply, and the torque command value calculated by the torque command calculation unit is substantially minimized. adjusted motors inverter. The advance angle adjustment device, motor inverter apparatus according to any one of claims 1 to 5 configured to change the adjustment amount of advance based on the voltage phase of the single-phase AC power source or inverter applied voltage. The motor inverter device according to any one of claims 1 to 6 , wherein the motor is for driving a compressor provided in an air conditioner.

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