CN108288939B - Compressor and refrigeration equipment - Google Patents

Compressor and refrigeration equipment Download PDF

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Publication number
CN108288939B
CN108288939B CN201810308110.2A CN201810308110A CN108288939B CN 108288939 B CN108288939 B CN 108288939B CN 201810308110 A CN201810308110 A CN 201810308110A CN 108288939 B CN108288939 B CN 108288939B
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CN
China
Prior art keywords
permanent magnet
magnet motor
compressor
rotating speed
equal
Prior art date
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Application number
CN201810308110.2A
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Chinese (zh)
Other versions
CN108288939A (en
Inventor
乔正忠
毛临书
宋万杰
邱小华
徐飞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Meizhi Compressor Co Ltd
Original Assignee
Guangdong Meizhi Compressor Co Ltd
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Publication date
Application filed by Guangdong Meizhi Compressor Co Ltd filed Critical Guangdong Meizhi Compressor Co Ltd
Publication of CN108288939A publication Critical patent/CN108288939A/en
Priority to PCT/CN2018/102031 priority Critical patent/WO2019134375A1/en
Application granted granted Critical
Publication of CN108288939B publication Critical patent/CN108288939B/en
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
    • H02P25/184—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays wherein the motor speed is changed by switching from a delta to a star, e.g. wye, connection of its windings, or vice versa
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278—Surface mounted magnets; Inset magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

The invention provides a compressor and refrigeration equipment. Wherein, the compressor for refrigeration plant, refrigeration plant include coupling assembling and the converter compressor who is connected with coupling assembling's one end includes: a first housing; the permanent magnet motor is arranged in the first shell and is connected with the other end of the connecting component; the critical rotation speed of the permanent magnet motor is n0; the preset rotating speed of the permanent magnet motor is n'; when the rotating speed a of the permanent magnet motor is in the range of n0-n' < a < n0, the effective value of the line voltage output by the frequency converter is U1; when the rotating speed a of the permanent magnet motor is in the range that n0 is more than or equal to n0 plus n', the effective value of the line voltage output by the frequency converter is U2; the relationship of U1 and U2 satisfies: 1.1U2 is less than or equal to U1 is less than or equal to 1.6U2; wherein, the value range of n 'is 0r/s < n' less than or equal to 1r/s. The compressor of the invention ensures that the product has higher performance in the full frequency band.

Description

Compressor and refrigeration equipment
Technical Field
The invention relates to the technical field of compressor manufacturing, in particular to a compressor and refrigeration equipment.
Background
The compressor is an important and core component of refrigeration equipment, and related technology proposes a technical scheme of winding switching, namely: when the motor of the compressor runs at a low speed, the stator windings of the compressor are in star connection, and when the motor of the compressor runs at a high speed, the stator windings of the compressor are in triangle connection. In the related art, the technical scheme of switching the critical rotation speed is not involved, if the critical rotation speed is improperly designed, the impact is possibly caused to be large when the connection mode of the winding is converted, the energy consumption is large, clamping stagnation is easy to occur, the working efficiency of a product is seriously affected, and the user experience is poor.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art or related art.
To this end, a first aspect of the invention proposes a compressor.
A second aspect of the present invention proposes a refrigeration appliance.
In view of this, a first aspect of the present invention proposes a compressor for a refrigeration appliance comprising a connection assembly and a inverter compressor connected to one end of the connection assembly, comprising: a first housing; the permanent magnet motor is arranged in the first shell and is connected with the other end of the connecting component; the critical rotation speed of the permanent magnet motor is n0; the preset rotating speed of the permanent magnet motor is n'; when the rotating speed a of the permanent magnet motor is in the range of n0-n' < a < n0, the effective value of the line voltage output by the frequency converter is U1; when the rotating speed a of the permanent magnet motor is in the range that n0 is more than or equal to n0 plus n', the effective value of the line voltage output by the frequency converter is U2; the relationship of U1 and U2 satisfies: 1.1U2 is less than or equal to U1 is less than or equal to 1.6U2; wherein, the value range of n 'is 0r/s < n' less than or equal to 1r/s.
The critical rotation speed of the permanent magnet motor of the compressor provided by the invention is n0, when the windings of the permanent magnet motor are in star connection, the rotation speed of the permanent magnet motor is smaller than n0, when the windings of the permanent magnet motor are in angular connection, the rotation speed of the permanent magnet motor is larger than n0, so that when the rotation speed of the permanent magnet motor is smaller than the critical rotation speed n0 and very close to the rotation speed of the critical rotation speed n0, namely, the rotation speed a of the permanent magnet motor is in the range of n0-n '. Ltoreq.a < n0, the line voltage effective value output by the frequency converter is U1, and meanwhile, when the rotation speed of the permanent magnet motor is larger than the critical rotation speed n0 and very close to the rotation speed of the critical rotation speed n0, namely, the rotation speed a of the permanent magnet motor is in the range of n0 < a+n 0', the line voltage effective value output by the frequency converter is U2, and the relationship between U1 and U2 is satisfied by reasonable control: 1.1U2 is less than or equal to U1 and less than or equal to 1.6U2, namely, U1 and U2 meet the relation, so that when the rotating speed of the permanent magnet motor is extremely close to the critical rotating speed, the permanent magnet motor with the star-shaped windings has certain field weakening depth, and the permanent magnet motor with the angular windings does not enter the field weakening area, thereby ensuring that the product has higher performance in the full frequency band; further, by reasonably setting the preset rotating speed, the value range is 0r/s < n' < 1r/s, and the range close to the critical rotating speed of the permanent magnet motor is further limited: n0-n 'is more than or equal to a and less than or equal to n0, and n0 is more than or equal to n0 and less than or equal to n0 plus n', so that when the connection mode of the windings of the permanent magnet motor is switched in the area, the switching is smoother, the impact can be greatly reduced, the transition is more stable, the operation energy efficiency of the product is improved, and the usability and the market competitiveness of the product are improved.
The compressor according to the present invention may further have the following additional technical features:
In the above technical scheme, preferably, when the rotation speed a of the permanent magnet motor is in the range of n 0-n'. Ltoreq.a < n0 and the compressor is under the same suction and exhaust pressure, the line current output by the frequency converter is I1; when the rotating speed a of the permanent magnet motor is in the range that n0 is more than or equal to n0 plus n', the line current output by the frequency converter is I2; the relationship of I1 and I2 satisfies: i2 is less than or equal to 1.7I1.
In the technical scheme, when the rotating speed of the permanent magnet motor is smaller than the critical rotating speed n0 and is very close to the rotating speed of the critical rotating speed n0, namely, the rotating speed a of the permanent magnet motor is in the range of n0-n '. Ltoreq.a < n0, the line current output by the frequency converter is I1, and when the rotating speed of the permanent magnet motor is larger than the critical rotating speed n0 and is very close to the rotating speed of the critical rotating speed n0, namely, the rotating speed a of the permanent magnet motor is in the range of n0 < a.ltoreq.n0+n', the line current output by the frequency converter is I2, and the relationship between I1 and I2 is reasonably set to be satisfied: i2 is less than or equal to 1.7I1, so that when the rotating speed of the permanent magnet motor is close to the critical rotating speed, the permanent magnet motor with the star-shaped windings has certain weak magnetic depth, and the permanent magnet motor with the angular windings does not enter the weak magnetic area, so that the product is ensured to have higher performance in the full frequency band, the switching of the connection mode of the windings of the permanent magnet motor is ensured to be free from clamping stagnation, the switching is smoother, and the transitional stability is ensured.
In any of the above technical solutions, preferably, when the rotation speed a of the permanent magnet motor is in the range of n 0-n'. Ltoreq.a < n0 when the compressor is under the same suction and exhaust pressure, the input power of the compressor is P1; when the rotating speed a of the permanent magnet motor is in the range that n0 is more than or equal to n0 plus n', the input power of the compressor is P2; the relationship between P1 and P2 satisfies: 0.95P2P 1 is less than or equal to 1.05P2.
In the technical scheme, when the rotating speed of the permanent magnet motor is smaller than the critical rotating speed n0 and is very close to the rotating speed of the critical rotating speed n0, namely, the rotating speed a of the permanent magnet motor is in the range of n0-n '. Ltoreq.a < n0, the input power of the compressor is P1, when the rotating speed of the permanent magnet motor is larger than the critical rotating speed n0 and is very close to the rotating speed of the critical rotating speed n0, namely, the rotating speed a of the permanent magnet motor is in the range of n0 < a.ltoreq.n 0+ n', the input power of the compressor is P2, and the relationship between P1 and P2 is reasonably set to ensure that P1 is not more than 0.95P2 and is not more than 1.05P2, namely, the power difference between the winding connection modes of the permanent magnet motor is reduced, the product performance transition stability of the rotating speed a of the permanent magnet motor in the range of n0-n '. Ltoreq.n 0 and n0+ n' is ensured, and the stability and reliability of the product use are ensured.
In any of the above solutions, preferably, the permanent magnet motor includes: a stator provided with a stator core and a winding wound on the stator core; and a rotor provided with a rotor core and permanent magnets positioned on the rotor core.
In the technical scheme, the stator comprises a stator core and a winding, the stator is stationary when the compressor operates by winding the winding on the stator core, and when current passes through the winding, the stator generates a magnetic field; the rotor comprises a rotor core and permanent magnets, the magnetic poles of the permanent magnets are not changed, and the permanent magnets are arranged on the rotor core, so that when the compressor works, the stator generates a rotating magnetic field, and the rotor is cut by magnetic lines of force in the rotating magnetic field to generate output current, so that power is provided for the operation of the compressor.
In any of the above technical solutions, preferably, the permanent magnet is a rare earth permanent magnet; or the permanent magnet is an ferrite permanent magnet.
In any of the above technical solutions, preferably, the rotor core includes slots, the number of slots is at least one, all slots are distributed at intervals along a circumferential direction of the rotor core, and the permanent magnets are disposed in the slots.
In this technical solution, a permanent magnet arrangement of the rotor is defined in particular. Through processing the slot on the rotor core, can provide the mounted position for the permanent magnet, the location and the assembly of the permanent magnet of being convenient for. Meanwhile, the structure has the advantages of few processing procedures, simple processing technology, low production cost and convenient mass production.
In any of the above technical solutions, preferably, the permanent magnet is cylindrical, and the permanent magnet is sleeved on an outer wall of the rotor core.
In this technical solution, a permanent magnet arrangement of the rotor is defined in particular. The permanent magnets are sleeved on the outer wall of the rotor core, the rotor core plays a supporting role, and the positioning and the assembly of the permanent magnets are facilitated. Meanwhile, the structure has the advantages of few processing procedures, simple processing technology, low production cost and convenient mass production.
A second aspect of the present invention proposes a refrigeration apparatus comprising: a second housing; the frequency converter is arranged in the second shell; the compressor of any one of the first aspects, wherein the compressor is disposed in the second casing; the connecting component is arranged in the second shell and is respectively connected with the frequency converter and the compressor; the controller is arranged in the second shell, is connected with the connecting assembly, the frequency converter and the compressor and is used for controlling the frequency converter, so that the relation between U1 and U2 is satisfied: 1.1U2U 1 is less than or equal to 1.6U2.
The refrigeration equipment provided by the invention comprises: the device comprises a second shell, a frequency converter, a compressor, a connecting component and a controller. By arranging the controller, when the wiring mode of the windings of the permanent magnet motor is switched within the range of n0 < a < n0+ n 'and n0-n' < a < n0, the controller controls the frequency converter, so that the line voltage effective values U1 and U2 output by the frequency converter meet the relation of 1.1U2 < U1 < 1.6U2, the permanent magnet motor with the windings being in star connection has certain weak magnetic depth when the rotating speed of the permanent magnet motor is extremely close to the critical rotating speed, the permanent magnet motor with the windings being in angle connection does not enter the weak magnetic area, the product is guaranteed to have higher performance in the full frequency band, the switching of the wiring mode of the windings of the permanent magnet motor is guaranteed to be free from clamping stagnation, the switching place is smoother, and the transitional stability is guaranteed.
In the above technical solution, preferably, the refrigeration apparatus further includes: and the detection device is arranged in the second shell, is connected with the controller and the compressor and is used for detecting the rotating speed of the permanent magnet motor.
In the technical scheme, the detection device is arranged in the second shell, and is used for detecting the rotating speed of the permanent magnet motor in real time, so that real-time data is provided for controlling and judging whether the rotating speed of the permanent magnet motor enters or leaves the range of n0 < a < n0+ n 'and n0-n' < a < n0, and the controller can accurately and timely control the actions of other parts, thereby ensuring the reliability and the accuracy of product use.
In any of the foregoing solutions, preferably, the connection assembly includes: and the change-over switch is used for realizing the switching of star connection and angular connection of the windings of the permanent magnet motor.
In the technical scheme, the connection state of the windings of the permanent magnet motor and the frequency converter is realized by setting the change-over switch and utilizing the on or off of the change-over switch, so that the star connection of the windings of the permanent magnet motor and the angular connection of the windings of the permanent magnet motor are realized. Meanwhile, the structure is convenient to process, install and detach and replace, and has strong interchangeability.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
Fig. 1 is a schematic structural diagram of a frequency converter, a permanent magnet motor and a change-over switch according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a frequency converter, a permanent magnet motor and a switch according to a second embodiment of the present invention;
Fig. 3 is a schematic structural diagram of a frequency converter, a permanent magnet motor and a switch according to a third embodiment of the present invention;
FIG. 4 is a graphical representation of the efficiency of a permanent magnet motor as a function of rotational speed according to one embodiment of the present invention;
FIG. 5 is a cross-sectional view of a permanent magnet motor according to one embodiment of the present invention;
Fig. 6 is a sectional view of a compressor according to an embodiment of the present invention.
The correspondence between the reference numerals and the component names in fig. 1 to 6 is:
1 compressor, 10 converter, 20 permanent magnet motor, 202 stator, 204 stator core, 206 winding, 208 rotor, 210 rotor core, 212 permanent magnet, 214 head connector, 216 tail connector, 30 second casing, 40 change-over switch.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
A compressor 1 and a refrigerating apparatus according to some embodiments of the present invention are described below with reference to fig. 1 to 6.
As shown in fig. 1 to 3, an embodiment of a first aspect of the present invention proposes a compressor 1 for a refrigeration apparatus including a connection assembly and a frequency converter 10 connected to one end of the connection assembly, the compressor 1 comprising: a first housing; the permanent magnet motor 20 is arranged in the first shell and is connected with the other end of the connecting component; the critical rotation speed of the permanent magnet motor 20 is n0; the preset rotational speed of the permanent magnet motor 20 is n'; when the rotating speed a of the permanent magnet motor 20 is in the range of n 0-n'. Ltoreq.a < n0, the effective value of the line voltage output by the frequency converter 10 is U1; when the rotating speed a of the permanent magnet motor 20 is in the range of n 0< a < n0+ n', the effective value of the line voltage output by the frequency converter 10 is U2; the relationship of U1 and U2 satisfies: 1.1U2 is less than or equal to U1 is less than or equal to 1.6U2; wherein, the value range of n 'is 0r/s < n' less than or equal to 1r/s.
According to the permanent magnet motor 20 of the compressor 1 provided by the invention, the critical rotation speed of the permanent magnet motor 20 is n0, when the windings 206 of the permanent magnet motor 20 are in star connection, the rotation speed of the permanent magnet motor 20 is smaller than n0, when the windings 206 of the permanent magnet motor 20 are in angular connection, the rotation speed of the permanent magnet motor 20 is larger than n0, so that when the rotation speed of the permanent magnet motor 20 is smaller than the critical rotation speed n0 and is very close to the rotation speed of the critical rotation speed n0, namely, the rotation speed a of the permanent magnet motor 20 is in the range of n0-n '. Ltoreq.a < n 0', the line voltage effective value output by the frequency converter 10 is U1, and meanwhile, when the rotation speed a of the permanent magnet motor 20 is very close to the critical rotation speed n0, namely, the rotation speed a of the permanent magnet motor 20 is in the range of n0 & ltoreq.n 0+n ', the line voltage effective value output by the frequency converter 10 is U2, and the relationship between U1 and U2 is satisfied by reasonable control: 1.1U2 is less than or equal to U1 and less than or equal to 1.6U2, namely, U1 and U2 meet the relation, so that when the rotating speed of the permanent magnet motor 20 is extremely close to the critical rotating speed, the permanent magnet motor 20 with the star connection of the winding 206 has a certain weak magnetic depth, and the permanent magnet motor 20 with the angle connection of the winding 206 does not enter the weak magnetic area, thereby ensuring that the product has higher performance in the full frequency band; further, by reasonably setting the preset rotation speed, the value range is 0r/s < n'. Ltoreq.1r/s, and the range close to the critical rotation speed of the permanent magnet motor 20 is further limited: n0-n 'is less than or equal to a and less than or equal to n0, and n0 is less than or equal to n0 and less than or equal to n0+ n', so that when the connection mode of the windings 206 of the permanent magnet motor 20 is switched in the area, the switching is smoother, the impact can be greatly reduced, the transition is smoother, the operation energy efficiency of the product is improved, and the usability and the market competitiveness of the product are improved. Specifically, the current output by the power supply flows into the frequency converter 10 through the lead, so that the frequency converter 10 can transmit electric energy to the compressor 1 through the connecting component by changing the frequency of the power supply according to specific practical use requirements.
In the embodiment, as shown in fig. 1, the number of the switches 40 is 6, and S1, S2, S3, S4, S5 and S6 are respectively used. The permanent magnet motor 20 is powered by the frequency converter 10 and 6 change-over switches 40 are provided in the connection assembly. As shown in fig. 2, when S1, S2, and S3 are on, S4, S5, and S6 are off, windings 206 of permanent magnet motor 20 are connected in a star shape. As shown in fig. 3, when S1, S2, and S3 are off, and S4, S5, and S6 are on, windings 206 of permanent magnet motor 20 are connected in an angular shape. As shown in fig. 1 to 3, the directions of the partial currents I, I and I2 outputted from the inverter 10 and the line voltage effective values U, U1 and U2 outputted from the inverter 10 are labeled.
In a specific embodiment, as shown in fig. 4, the arrow indicates the direction of gradually increasing the rotation axis of the permanent magnet motor 20 and gradually increasing the efficiency of the permanent magnet motor 20, the critical rotation speed of the permanent magnet motor 20 is n0, when the windings 206 of the permanent magnet motor 20 are in star connection, the rotation speed of the permanent magnet motor 20 is less than n0, and when the windings 206 of the permanent magnet motor 20 are in angular connection, the rotation speed of the permanent magnet motor 20 is greater than n0. As can be seen, the efficiency curve of the permanent magnet motor 20 of the star connection winding 206 is in the falling mode at the critical rotation speed n0, and the efficiency curve of the permanent magnet motor 20 of the star connection winding 206 is in the rising mode at the critical rotation speed n0. In the star connection, it is assumed that the efficiency of the permanent magnet motor 20 decreases with an increase in the rotational speed when the rotational speed of the permanent magnet motor 20 is equal to or greater than n1, and that the rotational speed of the permanent magnet motor 20 is 1.1n1, which is the lower limit value of the critical rotational speed n0. In the angular connection, it is assumed that the efficiency of the permanent magnet motor 20 decreases with an increase in the rotation speed when the rotation speed of the permanent magnet motor 20 is equal to or greater than n2, and that the upper limit value of the critical rotation speed n0 is set when the rotation speed of the permanent magnet motor 20 is 0.9n2. Thereby ensuring that near the critical rotation speed n0, the star connection has a certain field weakening depth, and the angular connection has a certain range of the rotation speed of the permanent magnet motor 20 rising without field weakening. Therefore, 1.1n1.ltoreq.n0.ltoreq.0.9n2 is selected comprehensively.
In a specific embodiment, as shown in fig. 1 to 3, when the permanent magnet motor 20 is not weak in the rotation speed within the range of n0-n '. Ltoreq.a < n0 and n0 < a.ltoreq.n0+n', u1≡ 1.732U2; assuming that the permanent magnet motor 20 is weak in the rotation speed range of n0-n '< a < n0 and n0 < a < n0+ n', U1 is approximately equal to U2. In order to give consideration to the comprehensive performance of the full frequency band of the product, according to the comprehensive selection: 1.1n1.ltoreq.n0.ltoreq.0.9n2, thereby obtaining the optimal control range of 1.1U2.ltoreq.U1.ltoreq. 1.6U2.
In one embodiment of the present invention, preferably, when the rotational speed a of the permanent magnet motor 20 is within the range of n 0-n'. Ltoreq.a < n0 while the compressor 1 is under the same suction and discharge pressure, the line current outputted from the inverter 10 is I1; when the rotating speed a of the permanent magnet motor 20 is in the range of n0 < a < n0+ n', the line current output by the frequency converter 10 is I2; the relationship of I1 and I2 satisfies: i2 is less than or equal to 1.7I1.
In this embodiment, when the rotational speed of the permanent magnet motor 20 is less than the critical rotational speed n0 and very close to the rotational speed of the critical rotational speed n0, that is, when the rotational speed a of the permanent magnet motor 20 is within the range of n0-n '. Ltoreq.a < n0, the line current outputted by the inverter 10 is I1, and when the rotational speed of the permanent magnet motor 20 is greater than the critical rotational speed n0 and very close to the rotational speed of the critical rotational speed n0, that is, when the rotational speed a of the permanent magnet motor 20 is within the range of n0 < a.ltoreq.n0+n', the line current outputted by the inverter 10 is I2, by reasonably setting the relationship of I1 and I2 to satisfy: i2 is less than or equal to 1.7I1, so that when the rotating speed of the permanent magnet motor 20 is close to the critical rotating speed, the permanent magnet motor 20 with the star connection of the windings 206 has certain weak magnetic depth, the permanent magnet motor 20 with the angle connection of the windings 206 does not enter the weak magnetic area, the product is guaranteed to have higher performance in the full frequency band, the connection mode of the windings 206 of the permanent magnet motor 20 is guaranteed to be switched without clamping stagnation, the switching is smoother, and the transitional stability is guaranteed.
In a specific embodiment, when the permanent magnet motor 20 is in field weakening control, the current is divided into Iq and Id. Setting the included angle of Id and Iq to α, iq=i×cos α. When the rotating speed a of the permanent magnet motor 20 is in the range of n0-n' less than or equal to a < n0, alpha is more than or equal to 10 degrees; when the rotation speed a of the permanent magnet motor 20 is in the range of n0 < a < n0+ n', alpha is approximately 10 deg.. When the compressor 1 is not weak in the range of n0-n 'is more than or equal to a and less than or equal to n0 and n0 is more than or equal to n0+n' under the same suction and exhaust pressure, i2= 1.732I1. Under the condition of meeting the weak magnetic stripe piece, the I2 is less than or equal to 1.7I1.
In one embodiment of the present invention, preferably, when the rotation speed a of the permanent magnet motor 20 is in the range of n 0-n'. Ltoreq.a < n0 when the compressor 1 is under the same suction and discharge pressure, the input power of the compressor 1 is P1; when the rotating speed a of the permanent magnet motor 20 is in the range of n0 < a < n0+ n', the input power of the compressor 1 is P2; the relationship between P1 and P2 satisfies: 0.95P2P 1 is less than or equal to 1.05P2.
In this embodiment, when the rotational speed of the permanent magnet motor 20 is less than the critical rotational speed n0 and very close to the rotational speed of the critical rotational speed n0, that is, when the rotational speed a of the permanent magnet motor 20 is within the range of n0-n '. Ltoreq.a < n0, the input power of the compressor 1 is P1, and when the rotational speed of the permanent magnet motor 20 is greater than the critical rotational speed n0 and very close to the rotational speed of the critical rotational speed n0, that is, when the rotational speed a of the permanent magnet motor 20 is within the range of n0 < a.ltoreq.n0+n', the input power of the compressor 1 is P2, the relationship between P1 and P2 is reasonably set so as to satisfy 0.95P2.ltoreq. 1.05P2, that is, the difference in power between before and after switching the winding 206 connection mode of the permanent magnet motor 20 is reduced, the product performance transition stability of the permanent magnet motor 20 within the range of n0-n '. Ltoreq.a < n0 and n0 < a.ltoreq.0+n' is ensured.
In a specific embodiment, the comprehensive performance of the full frequency band of the product is comprehensively considered, and the difference value of the input power of the compressor 1 in the two ranges of the rotating speed of n0-n 'is less than or equal to a < n0 and n0 is less than or equal to a < n0+n' is within 5 percent, and especially the closer the more optimal the input power is.
In a specific embodiment, the relationship between U1 and U2 satisfies: 1.1U2.ltoreq.U1.ltoreq. 1.6U2, and the relationship between I1 and I2 satisfies: i2 is less than or equal to 1.7I1, and the relation between P1 and P2 satisfies the following conditions: 0.95P2P 1 is less than or equal to 1.05P2.
In one embodiment of the present invention, preferably, as shown in fig. 5, the permanent magnet motor 20 includes: a stator 202 provided with a stator core 204 and a winding 206 wound around the stator core 204; rotor 208 is provided with rotor core 210 and permanent magnets 212 located on rotor core 210.
In this embodiment, the stator 202 includes a stator core 204 and windings 206, and by winding the windings 206 around the stator core 204, the stator 202 is stationary while the compressor 1 is in operation, and when current passes through the windings 206, the stator 202 generates a magnetic field; the rotor 208 includes a rotor core 210 and permanent magnets 212, and the poles of the permanent magnets 212 are not changed, so that when the compressor 1 is in operation, the stator 202 generates a rotating magnetic field, and the rotor 208 is cut by magnetic lines of force in the rotating magnetic field to generate output current, thereby providing power for the operation of the compressor 1.
In a specific embodiment, as shown in fig. 5, the permanent magnet motor 20 has a 9-slot 6-pole structure. Taking the example of each phase winding 206 in series, each phase winding 206 has a header 214 and a footer 216, with the header 214 and footer 216 being connected to the outlets, respectively. The number of joints per phase winding 206 may be 2k (k=1, 2 … …) depending on the application.
In one embodiment of the present invention, the permanent magnet 212 is preferably a rare earth permanent magnet; or permanent magnet 212 is a ferrite permanent magnet.
In one embodiment of the present invention, it is preferable that the rotor core 210 includes slots, the number of which is at least one, all of which are spaced apart in the circumferential direction of the rotor core 210, and the permanent magnets 212 are disposed in the slots.
In this embodiment, a permanent magnet 212 arrangement of the rotor 208 is specifically defined. By machining slots in rotor core 210, mounting locations for permanent magnets 212 may be provided, facilitating positioning and assembly of permanent magnets 212. Meanwhile, the structure has the advantages of few processing procedures, simple processing technology, low production cost and convenient mass production.
In one embodiment of the present invention, the permanent magnet 212 is preferably cylindrical, and the permanent magnet 212 is sleeved on the outer wall of the rotor core 210.
In this embodiment, a permanent magnet 212 arrangement of the rotor 208 is specifically defined. The permanent magnets 212 are sleeved on the outer wall of the rotor core 210, so that the rotor core 210 plays a supporting role, and the positioning and the assembly of the permanent magnets 212 are facilitated. Meanwhile, the structure has the advantages of few processing procedures, simple processing technology, low production cost and convenient mass production.
As shown in fig. 6, according to a second aspect of the embodiment of the present invention, there is also provided a refrigeration apparatus including: a second housing 30; a frequency converter 10 disposed in the second housing 30; the compressor 1 according to the embodiment of the first aspect, the compressor 1 is disposed in the second housing 30; a connection assembly disposed in the second housing 30 and respectively connecting the inverter 10 and the compressor 1; a controller disposed in the second housing 30, connecting the connection assembly, the inverter 10 and the compressor 1, for controlling the inverter such that the relationship between U1 and U2 satisfies: 1.1U2U 1 is less than or equal to 1.6U2.
The refrigeration equipment provided by the invention comprises: the second casing 30, the inverter 10, the compressor 1, the connection assembly and the controller. By arranging the controller, when the wiring mode of the windings 206 of the permanent magnet motor 20 is switched in the range of n0 < a < n0+ n 'and n0-n' < a < n0, the controller controls the frequency converter 10, so that the effective values U1 and U2 of line voltage output by the frequency converter 10 meet the relation of 1.1U2 < U1 < 1.6U2, further, when the rotating speed of the permanent magnet motor 20 is extremely close to the critical rotating speed, the permanent magnet motor 20 with the windings 206 in a star connection mode has a certain weak magnetic depth, and the permanent magnet motor 20 with the windings 206 in an angle connection mode does not enter the weak magnetic area, thereby ensuring that the product has higher performance in the full frequency band, ensuring that the switching of the connection mode of the windings 206 of the permanent magnet motor 20 is free from clamping stagnation, ensuring smoother switching and ensuring transitional stability.
In one embodiment of the present invention, preferably, the refrigeration apparatus further includes: and the detection device is arranged in the second shell 30, is connected with the controller and the compressor 1 and is used for detecting the rotating speed of the permanent magnet motor 20.
In this embodiment, by arranging the detection device in the second housing 30, the rotation speed of the permanent magnet motor 20 is detected in real time by using the detection device, and in order to control and determine whether the rotation speed of the permanent magnet motor 20 enters or leaves the range of n0 < a < n0+n 'and n0-n' < a < n0, real-time data is provided, so that the controller can accurately and timely control the actions of other components, and the reliability and accuracy of product use are ensured.
In one embodiment of the present invention, preferably, as shown in fig. 1, the connection assembly includes: the switch 40 is used for switching the star connection and the angular connection of the windings 206 of the permanent magnet motor 20.
In this embodiment, by providing the change-over switch 40, the connection state between the windings 206 of the permanent magnet motor 20 and the frequency converter 10 is achieved by turning on or off the change-over switch 40, and further, the windings 206 of the permanent magnet motor 20 are connected in a star shape and the windings 206 of the permanent magnet motor 20 are connected in an angle shape. Meanwhile, the structure is convenient to process, install and detach and replace, and has strong interchangeability.
In the present invention, the term "plurality" means two or more, unless explicitly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A compressor for a refrigeration appliance, the refrigeration appliance including a connection assembly and a frequency converter connected to one end of the connection assembly, the compressor comprising:
a first housing;
The permanent magnet motor is arranged in the first shell and is connected with the other end of the connecting component;
the critical rotating speed of the permanent magnet motor is n0;
The preset rotating speed of the permanent magnet motor is n';
When the rotating speed a of the permanent magnet motor is in the range of n 0-n'. Ltoreq.a < n0, the effective value of the line voltage output by the frequency converter is U1;
when the rotating speed a of the permanent magnet motor is in a range of n0 < a < n0+ n', the effective value of the line voltage output by the frequency converter is U2;
The relationship between the U1 and the U2 satisfies: 1.1U2 is less than or equal to U1 is less than or equal to 1.6U2;
Wherein the value range of n 'is 0r/s < n' < 1r/s;
the connecting assembly comprises a change-over switch, and the change-over switch is used for realizing the switching of star connection and angular connection of the windings of the permanent magnet motor.
2. The compressor of claim 1, wherein,
When the compressors are at the same suction and discharge pressures,
When the rotating speed a of the permanent magnet motor is in the range of n 0-n'. Ltoreq.a < n0, the line current output by the frequency converter is I1;
when the rotating speed a of the permanent magnet motor is in the range that n0 is more than or equal to n0 plus n', the line current output by the frequency converter is I2;
the relationship of the I1 and the I2 satisfies the following conditions: i2 is less than or equal to 1.7I1.
3. The compressor of claim 1, wherein,
When the compressors are at the same suction and discharge pressures,
When the rotating speed a of the permanent magnet motor is in the range of n 0-n'. Ltoreq.a < n0, the input power of the compressor is P1;
when the rotating speed a of the permanent magnet motor is in the range that n0 is more than or equal to n0 plus n', the input power of the compressor is P2;
the relationship between the P1 and the P2 satisfies the following conditions: 0.95P2P 1 is less than or equal to 1.05P2.
4. A compressor according to any one of claims 1 to 3, wherein,
The permanent magnet motor includes:
a stator provided with a stator core and the winding wound on the stator core;
And the rotor is provided with a rotor core and permanent magnets positioned on the rotor core.
5. The compressor of claim 4, wherein,
The permanent magnet is a rare earth permanent magnet; or (b)
The permanent magnet is an ferrite permanent magnet.
6. The compressor of claim 4, wherein,
The rotor core comprises slots, the number of the slots is at least one, all the slots are distributed at intervals along the circumferential direction of the rotor core, and the permanent magnets are arranged in the slots.
7. The compressor of claim 4, wherein,
The permanent magnet is cylindrical, and is sleeved on the outer wall of the rotor core.
8. A refrigeration appliance, comprising:
A second housing;
The frequency converter is arranged in the second shell;
The compressor of any one of claims 1 to 7, disposed within the second housing;
The connecting component is arranged in the second shell and is respectively connected with the frequency converter and the compressor;
The controller is arranged in the second shell, is connected with the connecting assembly, the frequency converter and the compressor and is used for controlling the frequency converter, so that the relation between the U1 and the U2 is satisfied: 1.1U2U 1 is less than or equal to 1.6U2.
9. The refrigeration appliance of claim 8 further comprising:
And the detection device is arranged in the second shell, is connected with the controller and the compressor and is used for detecting the rotating speed of the permanent magnet motor.
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