Permanent magnet synchronous motor, speed estimation method thereof, and air conditioner

Abstract

The present invention discloses a permanent magnet synchronous motor, a speed estimation method thereof, and an air conditioner. The permanent magnet synchronous motor comprises: a motor body, a controller, a first bridge arm switching device, a second bridge arm switching device, a third bridge arm switching device, and a bus capacitor. The first bridge arm switching device comprises a first upper bridge arm switching device and a first lower bridge arm switching device, the second bridge arm switching device comprises a second upper bridge arm switching device and a second lower bridge arm switching device, and the third bridge arm switching device comprises a third upper bridge arm switching device and a third lower bridge arm switching device. The controller is configured to output a pulse signal with a preset duty cycle to at least two of the first lower bridge arm switching device, the second lower bridge arm switching device, and the third lower bridge arm switching device, obtain a bus voltage across the bus capacitor during a low level period of the pulse signal, and estimate the speed of the permanent magnet synchronous motor based on the bus voltage. The motor speed can be estimated without adding hardware circuits, and the method is low in cost, simple, and convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a permanent magnet synchronous motor, a rotation speed estimation method thereof, and an air conditioner. Background Art

[0002] Permanent magnet synchronous motors used in electric fans and air conditioner outdoor fans, for example, rotate clockwise or counterclockwise when not in operation due to the influence of external airflow. However, these applications typically lack rotor position sensors, making it impossible to detect the motor's rotational speed before startup. Existing techniques typically involve adding a back-EMF sampling circuit to the hardware to detect the motor's back EMF before startup. Alternatively, position observers capable of detecting low and zero speeds, such as high-frequency injection, are employed to measure the rotational position before the motor starts. However, these methods are costly and complex. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention aims to provide a permanent magnet synchronous motor, a speed estimation method thereof, and an air conditioner.

[0004] A permanent magnet synchronous motor proposed in the present invention includes: a motor body, a controller, a first bridge arm switching device, a second bridge arm switching device, a third bridge arm switching device and a bus capacitor, wherein the first bridge arm switching device, the second bridge arm switching device, the third bridge arm switching device and the bus capacitor are connected in parallel with each other, and a three-phase motor winding is provided in the motor body; the first bridge arm switching device includes a first upper bridge arm switching device and a first lower bridge arm switching device, the second bridge arm switching device includes a second upper bridge arm switching device and a second lower bridge arm switching device, and the third bridge arm switching device includes a third upper bridge arm switching device and a third lower bridge arm switching device; the first upper bridge arm switching device, the first lower bridge arm switching device, the second upper bridge arm switching device, the second lower bridge arm switching device The device, the third upper bridge arm switching device and the third lower bridge arm switching device are each connected in reverse parallel with a diode; the connection point between the first upper bridge arm switching device and the first lower bridge arm switching device, the connection point between the second upper bridge arm switching device and the second lower bridge arm switching device and the connection point between the third upper bridge arm switching device and the third lower bridge arm switching device are respectively connected to one end of the three-phase motor winding of the permanent magnet synchronous motor; the controller is configured to: output a pulse signal with a preset duty cycle to at least two of the first lower bridge arm switching device, the second lower bridge arm switching device and the third lower bridge arm switching device, obtain the bus voltage across the bus capacitor during the low level period of the pulse signal, and estimate the speed of the permanent magnet synchronous motor based on the bus voltage.

[0005] In addition, the permanent magnet synchronous motor according to the embodiment of the present invention may also have the following additional technical features:

[0006] Furthermore, it also includes: a voltage sampling unit, which is connected in parallel with the bus capacitor, and the controller is specifically configured to: during the low level period of the pulse signal, sample the bus voltage across the bus capacitor through the voltage sampling unit.

[0007] Furthermore, the voltage sampling unit includes a first sampling resistor and a second sampling resistor connected in series, and the controller is specifically configured to: use the voltage at the connection point of the first sampling resistor and the second sampling resistor as the bus voltage.

[0008] Furthermore, the controller is specifically configured to: obtain the increase amplitude of the bus voltage; and estimate the rotation speed of the permanent magnet synchronous motor according to the increase amplitude of the bus voltage.

[0009] Furthermore, the increase in the bus voltage is proportional to the rotational speed of the permanent magnet synchronous motor.

[0010] Furthermore, the controller is specifically configured to: before estimating the speed of the permanent magnet synchronous motor based on the increase in the bus voltage, establish a data table, wherein the data table is used to record the mapping relationship between the increase in the bus voltage and the speed of the permanent magnet synchronous motor.

[0011] Furthermore, the controller is specifically configured to: receive multiple sets of mapping relationship data between the bus voltage increase amplitude and the motor speed; and calibrate the data table according to the multiple sets of mapping relationship data between the bus voltage increase amplitude and the motor speed.

[0012] Furthermore, the controller is specifically configured to: search the data table for a target speed value of the permanent magnet synchronous motor corresponding to the bus voltage increase amplitude, and use the target speed value as the speed of the permanent magnet synchronous motor.

[0013] According to the permanent magnet synchronous motor of an embodiment of the present invention, before the permanent magnet synchronous motor is started, a pulse signal with a preset duty cycle is output to at least two of the first lower bridge arm switching device, the second lower bridge arm switching device and the third lower bridge arm switching device. During the low level period of the pulse signal, the bus voltage across the bus capacitor is obtained, and the speed of the permanent magnet synchronous motor is estimated based on the bus voltage. Without adding a back electromotive force detection circuit, the motor speed can be estimated, which has the advantages of low cost, simplicity and convenience.

[0014] A further embodiment of the present invention also discloses a method for estimating the speed of a permanent magnet synchronous motor, which is used for a permanent magnet synchronous motor as described in any of the above embodiments. The method includes: outputting a pulse signal with a preset duty cycle to at least two of the first lower bridge arm switching device, the second lower bridge arm switching device, and the third lower bridge arm switching device; obtaining the bus voltage across the bus capacitor during the low level period of the pulse signal; and estimating the speed of the permanent magnet synchronous motor based on the bus voltage.

[0015] According to the speed estimation method of a permanent magnet synchronous motor in an embodiment of the present invention, before the permanent magnet synchronous motor is started, a pulse signal with a preset duty cycle is output to at least two of the first lower bridge arm switching device, the second lower bridge arm switching device and the third lower bridge arm switching device. During the low level period of the pulse signal, the bus voltage across the bus capacitor is obtained, and the speed of the permanent magnet synchronous motor is estimated based on the bus voltage. The motor speed can be estimated without adding a back electromotive force detection circuit, which has the advantages of low cost, simplicity and convenience.

[0016] A further embodiment of the present invention also discloses an air conditioner, comprising the permanent magnet synchronous motor as described in any of the above embodiments.

[0017] According to an embodiment of the present invention, before the permanent magnet synchronous motor is started, the air conditioner outputs a pulse signal with a preset duty cycle to at least two of the first lower bridge arm switching device, the second lower bridge arm switching device and the third lower bridge arm switching device. During the low level period of the pulse signal, the bus voltage across the bus capacitor is obtained, and the speed of the permanent magnet synchronous motor is estimated based on the bus voltage. The motor speed can be estimated without adding a back electromotive force detection circuit, which has the advantages of low cost, simplicity and convenience.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0020] Figure 1 is a structural schematic diagram of a permanent magnet synchronous motor according to an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the induced current flow direction of a permanent magnet synchronous motor according to an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of the induced current flow direction of a permanent magnet synchronous motor according to another embodiment of the present invention;

[0023] Figure 4 is a flow chart of a method for estimating the speed of a permanent magnet synchronous motor according to one embodiment of the present invention;

[0024] Figure 5 is a flow chart of estimating motor speed based on bus voltage according to one embodiment of the present invention;

[0025] Figure 6 is a flowchart of establishing a data table according to one embodiment of the present invention. DETAILED DESCRIPTION

[0026] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention will be described in detail below.

[0027] Reference below Figures 1-6 A permanent magnet synchronous motor, a speed estimation method thereof, and an air conditioner according to embodiments of the present invention are described.

[0028] Figure 1 FIG. 1 is a schematic diagram of the structure of a permanent magnet synchronous motor according to an embodiment of the present invention. Figure 1 As shown, a permanent magnet synchronous motor includes: a motor body M, a controller (not shown in the figure), a first bridge arm switch device, a second bridge arm switch device, a third bridge arm switch device and a bus capacitor C1. The first bridge arm switch device, the second bridge arm switch device, the third bridge arm switch device and the bus capacitor C1 are connected in parallel with each other, and a three-phase motor winding is provided in the motor body M; the first bridge arm switch device includes a first upper bridge arm switch device Q1 and a first lower bridge arm switch device Q4, the second bridge arm switch device includes a second upper bridge arm switch device Q2 and a second lower bridge arm switch device Q5, and the third bridge arm switch device includes a third upper bridge arm switch device Q3 and a third lower bridge arm switch device Q6; the first upper bridge arm switch device Q1, the first lower arm switch device A diode is connected in reverse parallel to each of the first upper-arm switching device Q4, the second upper-arm switching device Q2, the second lower-arm switching device Q5, the third upper-arm switching device Q3, and the third lower-arm switching device Q6. The connection point between the first upper-arm switching device Q1 and the first lower-arm switching device Q4, the connection point between the second upper-arm switching device Q2 and the second lower-arm switching device Q5, and the connection point between the third upper-arm switching device Q3 and the third lower-arm switching device Q6 are respectively connected to one end of the three-phase motor winding of the permanent magnet synchronous motor, namely, U, W, and Y. The controller is configured to output a pulse signal with a preset duty cycle to at least two of the first lower-arm switching device Q4, the second lower-arm switching device Q5, and the third lower-arm switching device Q6, obtain a bus voltage across the bus capacitor C1 during the low-level period of the pulse signal, and estimate the speed of the permanent magnet synchronous motor based on the bus voltage.

[0029] Specifically, before the permanent magnet synchronous motor is started, when it is in a rotating state due to the influence of external forces, such as external airflow, there will be an induced electromotive force between the three-phase motor windings. At this time, if a pulse signal with a preset duty cycle is output to at least two of the first lower bridge arm switch device Q4, the second lower bridge arm switch device Q5 and the third lower bridge arm switch device Q6, such as the first lower bridge arm switch device Q4 and the second lower bridge arm switch device Q5, during the high level period of the pulse signal, the first lower bridge arm switch device Q4 and the second lower bridge arm switch device Q5 are in the on state, then an induced current will be generated between U-Q4-Q5-W (such as Figure 2 As shown), during the low level period of the pulse signal, the first lower bridge arm switch device Q4 and the second lower bridge arm switch device Q5 are in the off state. When the first lower bridge arm switch device Q4 and the second lower bridge arm switch device Q5 are switched from the on state to the off state, the loop between U and W is cut off. However, due to the existence of the motor winding inductance, the induced current cannot drop to zero immediately, but continues to flow in the original direction. At this time, the voltage at the U terminal will be raised above the bus voltage, causing the diode in anti-parallel connection with the first upper bridge arm switch device Q1 to conduct, and the induced current charges the bus capacitor C1 through the diode in anti-parallel connection with the first upper bridge arm switch device Q1 (as shown). Figure 3 As shown in FIG, the voltage across the bus capacitor C1 is raised. Therefore, the speed of the permanent magnet synchronous motor can be estimated based on the bus voltage across the bus capacitor C1. This method for estimating the speed of the permanent magnet synchronous motor does not require adding a back electromotive force detection circuit. The motor speed can be estimated before the permanent magnet synchronous motor is started, so as to further control the starting process of the permanent magnet synchronous motor. This method has the advantages of low cost, simplicity and convenience.

[0030] In one embodiment of the present invention, the permanent magnet synchronous motor further comprises: a voltage sampling unit. The voltage sampling unit is connected in parallel with the bus capacitor C1, and the controller is specifically configured to: during the low level period of the pulse signal, sample the bus voltage across the bus capacitor C1 through the voltage sampling unit. Specifically, Figure 1-3 As shown, the voltage sampling unit includes a first sampling resistor R1 and a second sampling resistor R2 connected in series, and the voltage at the connection point of the first sampling resistor R1 and the second sampling resistor R2 is used as the bus voltage.

[0031] In one embodiment of the present invention, the controller is specifically configured to: obtain the bus voltage increase amplitude; and estimate the speed of the permanent magnet synchronous motor based on the bus voltage increase amplitude. The bus voltage increase amplitude is proportional to the speed of the permanent magnet synchronous motor.

[0032] Specifically, when the permanent magnet synchronous motor is subjected to external force, the greater its rotation speed, the greater the increase in bus voltage. Therefore, the speed of the permanent magnet synchronous motor can be estimated by the increase in bus voltage. That is, there is no need to add a back electromotive force detection circuit. The motor speed can be estimated before the permanent magnet synchronous motor starts, so as to further control the starting process of the permanent magnet synchronous motor. It has the advantages of low cost, simplicity and convenience.

[0033] In one embodiment of the present invention, before estimating the speed of the permanent magnet synchronous motor based on the increase in bus voltage, a data table is created to record the mapping relationship between the increase in bus voltage and the speed of the permanent magnet synchronous motor.

[0034] Specifically, the data table shows a one-to-one correspondence between the bus voltage increase and the permanent magnet synchronous motor's speed. When the permanent magnet synchronous motor is subjected to an external force, once the bus voltage increase is determined, the motor's speed can be retrieved from the table based on the current bus voltage increase. Therefore, before estimating the motor's speed, a data table must be established to estimate the motor's speed.

[0035] In one embodiment of the present invention, the controller is specifically configured to: receive multiple sets of mapping relationship data between the increase amplitude of bus voltage and motor speed; and calibrate the data table based on the mapping relationship data between the increase amplitude of bus voltage and motor speed.

[0036] In a specific embodiment, when establishing a data table, it is necessary to receive multiple sets of mapping relationship data between the bus voltage increase amplitude and the motor speed. The mapping relationship data between the bus voltage increase amplitude and the motor speed can be determined based on experiments, that is, the motor speed is calibrated for different bus voltage increase amplitudes. Furthermore, based on the mapping relationship data between the bus voltage increase amplitude and the motor speed, a relationship curve between the bus voltage increase amplitude and the motor speed can be fitted. After obtaining the bus voltage increase amplitude, the target motor speed corresponding to the increase amplitude can be obtained based on the fitted relationship curve.

[0037] In one embodiment of the present invention, the controller is specifically configured to: look up the target speed value of the permanent magnet synchronous motor corresponding to the bus voltage increase amplitude in the data table, and use the target speed value as the speed of the permanent magnet synchronous motor.

[0038] Specifically, the bus voltage increase in the data table can represent multiple continuous data ranges. In practical applications, once the bus voltage increase is determined, the target speed corresponding to the bus voltage increase is determined based on the range of values ​​within which the bus voltage increase falls. This target speed is the speed of the permanent magnet synchronous motor. This means that before the permanent magnet synchronous motor starts, the motor speed can be estimated without adding a back-electromotive force detection circuit, offering the advantages of low cost, simplicity, and convenience.

[0039] According to the permanent magnet synchronous motor of an embodiment of the present invention, before the permanent magnet synchronous motor is started, a pulse signal with a preset duty cycle is output to at least two of the first lower bridge arm switching device Q4, the second lower bridge arm switching device Q5 and the third lower bridge arm switching device Q6. During the low level period of the pulse signal, the bus voltage across the bus capacitor C1 is obtained, and the speed of the permanent magnet synchronous motor is estimated based on the bus voltage. Without adding a back electromotive force detection circuit, the motor speed can be estimated, which has the advantages of low cost, simplicity and convenience.

[0040] A further embodiment of the present invention further discloses a method for estimating the rotational speed of a permanent magnet synchronous motor, which is used for the permanent magnet synchronous motor as described in any of the above embodiments. Figure 4 FIG. 1 is a flow chart of a method for estimating the speed of a permanent magnet synchronous motor according to an embodiment of the present invention. Figure 4 As shown, a method for estimating the speed of a permanent magnet synchronous motor includes the following steps:

[0041] Step S1: outputting a pulse signal with a preset duty cycle to at least two of the first lower bridge arm switching device, the second lower bridge arm switching device, and the third lower bridge arm switching device.

[0042] Step S2: During the low level period of the pulse signal, the bus voltage across the bus capacitor is obtained.

[0043] Step S3: Estimate the speed of the permanent magnet synchronous motor according to the bus voltage.

[0044] In one embodiment of the present invention, obtaining the bus voltage across the bus capacitor during the low level period of the pulse signal includes: sampling the bus voltage across the bus capacitor through a voltage sampling unit during the low level period of the pulse signal.

[0045] In one embodiment of the present invention, the voltage sampling unit includes a first sampling resistor and a second sampling resistor connected in series, and the voltage at the connection point between the first sampling resistor and the second sampling resistor is used as the bus voltage.

[0046] In one embodiment of the present invention, Figure 5As shown, estimating the speed of the permanent magnet synchronous motor according to the bus voltage includes: obtaining the increase amplitude of the bus voltage; and estimating the speed of the permanent magnet synchronous motor according to the increase amplitude of the bus voltage.

[0047] In one embodiment of the present invention, the increase amplitude of the bus voltage is proportional to the rotation speed of the permanent magnet synchronous motor.

[0048] In one embodiment of the present invention, before estimating the speed of the permanent magnet synchronous motor based on the increase in bus voltage, it also includes: establishing a data table, wherein the data table is used to record the mapping relationship between the increase in bus voltage and the speed of the permanent magnet synchronous motor.

[0049] In one embodiment of the present invention, Figure 6 As shown, establishing a data table includes: receiving multiple sets of mapping relationship data between the increase amplitude of bus voltage and the motor speed; and calibrating the data table according to the mapping relationship data between the increase amplitude of bus voltage and the motor speed.

[0050] In one embodiment of the present invention, the speed of the permanent magnet synchronous motor is estimated based on the increase in bus voltage, including: looking up the target speed value of the permanent magnet synchronous motor corresponding to the increase in bus voltage in a data table, and using the target speed value as the speed of the permanent magnet synchronous motor.

[0051] It should be noted that when the speed estimation method of the permanent magnet synchronous motor in an embodiment of the present invention is performing the speed estimation of the permanent magnet synchronous motor, its specific implementation method is similar to the specific implementation method of the control method of the permanent magnet synchronous motor controller in an embodiment of the present invention. Please refer to the description of the method part for details. In order to reduce redundancy, it will not be repeated here.

[0052] According to the speed estimation method of a permanent magnet synchronous motor in an embodiment of the present invention, before the permanent magnet synchronous motor is started, a pulse signal with a preset duty cycle is output to at least two of the first lower bridge arm switching device, the second lower bridge arm switching device and the third lower bridge arm switching device. During the low level period of the pulse signal, the bus voltage across the bus capacitor is obtained, and the speed of the permanent magnet synchronous motor is estimated based on the bus voltage. The motor speed can be estimated without adding a back electromotive force detection circuit, which has the advantages of low cost, simplicity and convenience.

[0053] A further embodiment of the present invention also discloses an air conditioner, comprising the permanent magnet synchronous motor as described in any of the above embodiments.

[0054] It should be noted that when the air conditioner in the embodiment of the present invention estimates the speed of the permanent magnet synchronous motor, its specific implementation method is similar to the specific implementation method of the control method of the permanent magnet synchronous motor controller in the embodiment of the present invention. Please refer to the description of the method part for details. In order to reduce redundancy, it will not be repeated here.

[0055] According to an embodiment of the present invention, before the permanent magnet synchronous motor is started, the air conditioner outputs a pulse signal with a preset duty cycle to at least two of the first lower bridge arm switching device, the second lower bridge arm switching device and the third lower bridge arm switching device. During the low level period of the pulse signal, the bus voltage across the bus capacitor is obtained, and the speed of the permanent magnet synchronous motor is estimated based on the bus voltage. The motor speed can be estimated without adding a back electromotive force detection circuit, which has the advantages of low cost, simplicity and convenience.

[0056] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0057] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A permanent magnet synchronous motor, characterized in that: include: A motor body, a controller, a first bridge arm switching device, a second bridge arm switching device, a third bridge arm switching device and a bus capacitor, wherein the first bridge arm switching device, the second bridge arm switching device, the third bridge arm switching device and the bus capacitor are connected in parallel with each other, and a three-phase motor winding is provided in the motor body; The first bridge arm switching device includes a first upper bridge arm switching device and a first lower bridge arm switching device, the second bridge arm switching device includes a second upper bridge arm switching device and a second lower bridge arm switching device, and the third bridge arm switching device includes a third upper bridge arm switching device and a third lower bridge arm switching device; A diode is connected in reverse parallel to each of the first upper bridge arm switching device, the first lower bridge arm switching device, the second upper bridge arm switching device, the second lower bridge arm switching device, the third upper bridge arm switching device, and the third lower bridge arm switching device; The connection point between the first upper bridge arm switching device and the first lower bridge arm switching device, the connection point between the second upper bridge arm switching device and the second lower bridge arm switching device, and the connection point between the third upper bridge arm switching device and the third lower bridge arm switching device are respectively connected to one end of the three-phase motor winding of the permanent magnet synchronous motor; The controller is configured to: output a pulse signal with a preset duty cycle to at least two of the first lower bridge arm switching device, the second lower bridge arm switching device and the third lower bridge arm switching device, obtain the increase amplitude of the bus voltage across the bus capacitor during the low level period of the pulse signal, and estimate the speed of the permanent magnet synchronous motor based on the increase amplitude of the bus voltage.

2. The permanent magnet synchronous motor according to claim 1, characterized in that: Also includes: A voltage sampling unit is connected in parallel with the bus capacitor, and the controller is specifically configured as follows: During the low level period of the pulse signal, the bus voltage across the bus capacitor is sampled by the voltage sampling unit.

3. The permanent magnet synchronous motor according to claim 2, characterized in that: The voltage sampling unit includes a first sampling resistor and a second sampling resistor connected in series, and the controller is specifically configured to use a voltage at a connection point between the first sampling resistor and the second sampling resistor as the bus voltage.

4. The permanent magnet synchronous motor according to claim 1, characterized in that: The increase amplitude of the bus voltage is proportional to the rotation speed of the permanent magnet synchronous motor.

5. The permanent magnet synchronous motor according to claim 1, characterized in that: The controller is specifically configured to: before estimating the speed of the permanent magnet synchronous motor based on the increase in the bus voltage, establish a data table, wherein the data table is used to record the mapping relationship between the increase in the bus voltage and the speed of the permanent magnet synchronous motor.

6. The permanent magnet synchronous motor according to claim 5, characterized in that: The controller is specifically configured to: Receive multiple sets of mapping relationship data between bus voltage increase amplitude and motor speed; The data table is obtained by calibrating a plurality of sets of mapping relationship data between the increase amplitude of the bus voltage and the motor speed.

7. The permanent magnet synchronous motor according to claim 6, characterized in that: The controller is specifically configured to: The target speed value of the permanent magnet synchronous motor corresponding to the bus voltage increase amplitude is searched in the data table, and the target speed value is used as the speed of the permanent magnet synchronous motor.

8. A method for estimating the speed of a permanent magnet synchronous motor, characterized in that: For the permanent magnet synchronous motor according to any one of claims 1 to 7, the method comprises: Outputting a pulse signal with a preset duty cycle to at least two of the first lower bridge arm switching device, the second lower bridge arm switching device, and the third lower bridge arm switching device; During the low level period of the pulse signal, obtaining the increase amplitude of the bus voltage across the bus capacitor; The rotation speed of the permanent magnet synchronous motor is estimated according to the increase amplitude of the bus voltage.

9. An air conditioner, characterized in that: It comprises the permanent magnet synchronous motor as described in any one of claims 1 to 7.

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