Permanent magnet synchronous motor for elevator, control method and device thereof, and storage medium

Abstract

The application discloses an elevator permanent magnet synchronous motor and a control method and device thereof and a storage medium, wherein the elevator permanent magnet synchronous motor comprises a driving unit, a main switch, a first three-phase winding, a first short-circuit switch arranged correspondingly to the first three-phase winding, a second three-phase winding, and a second short-circuit switch arranged correspondingly to the second three-phase winding, and the method comprises the following steps: when the elevator permanent magnet synchronous motor is running, the main switch is controlled to be closed, and the first short-circuit switch and the second short-circuit switch are controlled to be opened, so that a three-phase, double three-phase or six-phase permanent magnet synchronous motor driven by the driving unit is formed, and motor driving is realized; when the driving unit fails, the main switch is controlled to be opened, and the first short-circuit switch and the second short-circuit switch are controlled to be closed, so that the first three-phase winding and the second three-phase winding form independent closed loops respectively, braking torque is generated through six-phase winding short-circuit current, and motor short-circuit braking is realized. Therefore, the short-circuit braking torque of the motor is improved.

Description

Technical Field

[0001] This invention relates to the field of elevator motor control technology, and in particular to a control method for an elevator permanent magnet synchronous motor, a computer-readable storage medium, a control device for an elevator permanent magnet synchronous motor, and an elevator permanent magnet synchronous motor. Background Technology

[0002] Currently, permanent magnet synchronous motors are used in elevator traction machines. Among them, the winding short-circuit braking method is usually used to achieve redundant protection after elevator drive power supply failure or mechanical braking failure.

[0003] However, the problem with this technology is that as motor technology develops and power density increases, the requirement for braking torque limits the further miniaturization and cost reduction of motors. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the first objective of this invention is to provide a control method for a permanent magnet synchronous motor for elevators, which can improve the short-circuit braking torque of the motor, thereby enabling the permanent magnet synchronous motor for elevators to further increase power density, reduce size, and lower cost.

[0005] A second objective of this invention is to provide a computer-readable storage medium.

[0006] The third objective of this invention is to provide a control device for a permanent magnet synchronous motor for elevators.

[0007] The fourth objective of this invention is to provide a permanent magnet synchronous motor for elevators.

[0008] To achieve the above objectives, a first aspect of the present invention provides a control method for a permanent magnet synchronous motor for elevators. The permanent magnet synchronous motor for elevators includes a drive unit, a main switch, a first three-phase winding, a first short-circuit switch corresponding to the first three-phase winding, a second three-phase winding, and a second short-circuit switch corresponding to the second three-phase winding. The method includes: when the permanent magnet synchronous motor for elevators is running, controlling the main switch to close and controlling the first and second short-circuit switches to open, forming a three-phase, dual three-phase, or six-phase permanent magnet synchronous motor driven by the drive unit via frequency conversion, thereby achieving motor drive; when the drive unit malfunctions, controlling the main switch to open and controlling the first and second short-circuit switches to close, so that the first three-phase winding and the second three-phase winding each form an independent closed loop, thereby generating braking torque through the short-circuit current of the six-phase winding, achieving short-circuit braking of the motor.

[0009] According to the control method of the permanent magnet synchronous motor for elevators of the present invention, when a drive unit malfunctions, the main switch is opened and the first short-circuit switch and the second short-circuit switch are closed, thereby forming independent closed circuits for the first three-phase winding and the second three-phase winding respectively. This generates braking torque through the short-circuit current of the six-phase winding, achieving short-circuit braking of the motor. This increases the short-circuit braking torque of the motor, thereby further increasing the power density, reducing the size, and lowering the cost of the permanent magnet synchronous motor for elevators.

[0010] In addition, the control method for a permanent magnet synchronous motor for elevators according to the above embodiments of the present invention may also have the following additional technical features: According to some embodiments of the present invention, the drive unit is a three-phase frequency converter, and the main switch includes a first main switch disposed between the three-phase frequency converter and the first three-phase winding. The first three-phase winding includes a first phase winding, a second phase winding, and a third phase winding. The second three-phase winding includes a fourth phase winding, a fifth phase winding, and a sixth phase winding. The first phase winding, the second phase winding, the third phase winding, the fourth phase winding, the fifth phase winding, and the sixth phase winding are connected to form a three-phase system. The method includes: when the elevator permanent magnet synchronous motor is running, controlling the first main switch to close and controlling the first short-circuit switch and the second short-circuit switch to open, forming a three-phase permanent magnet synchronous motor driven by the three-phase frequency converter to achieve motor drive; when the three-phase frequency converter malfunctions, controlling the first main switch to open and controlling the first short-circuit switch and the second short-circuit switch to close, so that the first three-phase winding and the second three-phase winding respectively form independent closed loops, so as to generate braking torque through the short-circuit current of the six-phase winding to achieve short-circuit braking of the motor.

[0011] According to some embodiments of the present invention, the drive unit is a six-phase frequency converter, and the main switch includes a second main switch disposed between the six-phase frequency converter and the first three-phase winding and a third main switch disposed between the six-phase frequency converter and the second three-phase winding. The first three-phase winding includes a first phase winding, a second phase winding, and a third phase winding, and the second three-phase winding includes a fourth phase winding, a fifth phase winding, and a sixth phase winding. The first phase winding, the second phase winding, the third phase winding, the fourth phase winding, the fifth phase winding, and the sixth phase winding are connected to form a dual three-phase or six-phase configuration. This includes: when the elevator permanent magnet synchronous motor is running, controlling the second main switch and the third main switch to close, and controlling the first short-circuit switch and the second short-circuit switch to open, forming a six-phase permanent magnet synchronous motor driven by the six-phase frequency converter, thereby realizing motor drive; when the six-phase frequency converter fails, controlling the second main switch and the third main switch to open, and controlling the first short-circuit switch and the second short-circuit switch to close, so that the first three-phase winding and the second three-phase winding respectively form independent closed circuits, so as to generate braking torque through the short-circuit current of the six-phase winding, thereby realizing short-circuit braking of the motor.

[0012] According to some embodiments of the present invention, the first phase winding, the second phase winding and the third phase winding are spatially separated by 120° electrical angles, and the fourth phase winding, the fifth phase winding and the sixth phase winding are respectively lagging behind the first phase winding, the second phase winding and the third phase winding by 30° electrical angles.

[0013] To achieve the above objectives, a computer-readable storage medium is provided in the second aspect of the present invention, on which a control program for a permanent magnet synchronous motor for an elevator is stored. When the control program for the permanent magnet synchronous motor for an elevator is executed by a processor, the control method for the permanent magnet synchronous motor for an elevator described in the embodiments of the present invention is implemented.

[0014] According to embodiments of the present invention, by executing the control program for a permanent magnet synchronous motor for elevators stored thereon, the short-circuit braking torque of the motor can be improved, thereby further increasing the power density, reducing the size, and lowering the cost of the permanent magnet synchronous motor for elevators.

[0015] To achieve the above objectives, a third aspect of the present invention provides a control device for a permanent magnet synchronous motor for elevators. The permanent magnet synchronous motor for elevators includes a drive unit, a main switch, a first three-phase winding, a first short-circuit switch corresponding to the first three-phase winding, a second three-phase winding, and a second short-circuit switch corresponding to the second three-phase winding. The device includes: a drive module, used to control the main switch to close and the first and second short-circuit switches to open when the permanent magnet synchronous motor for elevators is running, forming a three-phase, dual three-phase, or six-phase permanent magnet synchronous motor driven by the drive unit via frequency conversion, thereby achieving motor drive; and a braking module, used to control the main switch to open and the first and second short-circuit switches to close when the drive unit malfunctions, so that the first three-phase winding and the second three-phase winding each form an independent closed loop, thereby generating braking torque through the short-circuit current of the six-phase winding to achieve short-circuit braking of the motor.

[0016] According to the control device for a permanent magnet synchronous motor for elevators of the present invention, when the permanent magnet synchronous motor is running, the drive module controls the main switch to close and controls the first short-circuit switch and the second short-circuit switch to open, forming a three-phase, double three-phase, or six-phase permanent magnet synchronous motor driven by the drive unit via frequency conversion, thereby achieving motor drive. Furthermore, when the drive unit malfunctions, the braking module controls the main switch to open and controls the first short-circuit switch and the second short-circuit switch to close, causing the first three-phase winding and the second three-phase winding to form independent closed circuits respectively, generating braking torque through the short-circuit current of the six-phase winding, thus achieving short-circuit braking of the motor. This improves the short-circuit braking torque of the motor, thereby further increasing the power density, reducing the size, and lowering the cost of the permanent magnet synchronous motor for elevators.

[0017] To achieve the above objectives, a permanent magnet synchronous motor for elevators is proposed in a fourth aspect embodiment of the present invention. The permanent magnet synchronous motor for elevators employs stator core skewed slots or rotor permanent magnet skewed poles. The permanent magnet synchronous motor for elevators includes a drive unit, a main switch, and a first three-phase winding. The first three-phase winding includes a first phase winding, a second phase winding, and a third phase winding, a first short-circuit switch corresponding to the first three-phase winding, and a second three-phase winding. The second three-phase winding includes a fourth phase winding, a fifth phase winding, and a sixth phase winding, and a second short-circuit switch corresponding to the second three-phase winding. The drive unit is configured as follows: To drive the elevator permanent magnet synchronous motor via frequency conversion using the first three-phase winding and the second three-phase winding; the main switch is configured to connect the drive unit with the first three-phase winding and / or the second three-phase winding when closed; a first short-circuit switch corresponding to the first three-phase winding is configured to connect the first phase winding, the second phase winding, and the third phase winding into an independent closed loop when closed; a second short-circuit switch corresponding to the second three-phase winding is configured to connect the fourth phase winding, the fifth phase winding, and the sixth phase winding into an independent closed loop when closed.

[0018] According to an embodiment of the permanent magnet synchronous motor for elevators, when a drive unit malfunctions, the main switch is disconnected, and the first and second short-circuit switches are closed. This causes the first and second three-phase windings to form independent closed circuits, generating braking torque through the short-circuit current of the six-phase windings, thus achieving short-circuit braking of the motor. This increases the short-circuit braking torque of the motor, thereby further improving the power density, reducing the size, and lowering the cost of the permanent magnet synchronous motor for elevators.

[0019] In addition, the permanent magnet synchronous motor for elevators according to the above embodiments of the present invention may also have the following additional technical features: According to one embodiment of the present invention, the drive unit is a three-phase frequency converter, and the main switch includes a first main switch disposed between the three-phase frequency converter and the first three-phase winding, wherein the first phase winding, the second phase winding, the third phase winding, the fourth phase winding, the fifth phase winding and the sixth phase winding are connected to form a three-phase system.

[0020] According to one embodiment of the present invention, the drive unit is a six-phase frequency converter, and the main switch includes a second main switch disposed between the six-phase frequency converter and the first three-phase winding and a third main switch disposed between the six-phase frequency converter and the second three-phase winding, wherein the first phase winding, the second phase winding, the third phase winding, the fourth phase winding, the fifth phase winding and the sixth phase winding are connected to form a double three-phase or six-phase configuration.

[0021] According to one embodiment of the present invention, the skew angle of the stator core skew slot is 30° / pole pair number.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] Figure 1 This is a flowchart illustrating the control method for a permanent magnet synchronous motor for elevators according to an embodiment of the present invention. Figure 2 This is a circuit diagram of a permanent magnet synchronous motor for elevators according to an embodiment of the present invention; Figure 3 This is a flowchart illustrating a control method for a permanent magnet synchronous motor for an elevator according to an embodiment of the present invention. Figure 4 This is a circuit diagram of a permanent magnet synchronous motor for elevators according to another embodiment of the present invention; Figure 5 This is a flowchart illustrating a control method for a permanent magnet synchronous motor for an elevator according to another embodiment of the present invention; Figure 6 This is a block diagram of a control device for a permanent magnet synchronous motor for an elevator according to an embodiment of the present invention. Figure 7 This is a block diagram of a permanent magnet synchronous motor for elevators according to an embodiment of the present invention. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] The following description, with reference to the accompanying drawings, describes a control method for a permanent magnet synchronous motor for elevators, a computer-readable storage medium, a control device for a permanent magnet synchronous motor for elevators, and a permanent magnet synchronous motor for elevators, according to embodiments of the present invention.

[0026] Figure 1 This is a flowchart illustrating the control method for a permanent magnet synchronous motor for elevators according to an embodiment of the present invention.

[0027] Specifically, in some embodiments of the present invention, such as Figure 1 As shown, the control method for a permanent magnet synchronous motor in an elevator includes: S101, when the elevator uses a permanent magnet synchronous motor, the main control switch is closed, and the first short-circuit switch and the second short-circuit switch are opened, forming a three-phase, double three-phase or six-phase permanent magnet synchronous motor driven by the drive unit frequency converter, thus realizing motor drive.

[0028] It is understood that, in this embodiment of the present invention, when the elevator permanent magnet synchronous motor is running, by closing the main switch and disconnecting the first short-circuit switch corresponding to the first three-phase winding and the second short-circuit switch corresponding to the second three-phase winding, a three-phase, double three-phase or six-phase permanent magnet synchronous motor driven by the drive unit frequency converter is formed (the three-phase, double three-phase or six-phase permanent magnet synchronous motor is formed based on the different connection methods of the first three-phase winding and the second three-phase winding (shown by the dotted line)).

[0029] S102 When the drive unit fails, the main switch is opened and the first and second short-circuit switches are closed, so that the first three-phase winding and the second three-phase winding form independent closed circuits respectively, so as to generate braking torque through the short-circuit current of the six-phase winding and realize the short-circuit braking of the motor.

[0030] It is understood that in this embodiment of the present invention, when the drive unit fails, by disconnecting the main switch K and closing the first short-circuit switch corresponding to the first three-phase winding and the second short-circuit switch corresponding to the second three-phase winding, the first three-phase winding and the second three-phase winding respectively form independent closed circuits, so as to generate braking torque through the short-circuit current of the six-phase winding and realize the short-circuit braking of the motor.

[0031] Specifically, in the above embodiments of the present invention, compared with the prior art three-phase motor short-circuit braking, when forming a three-phase permanent magnet synchronous motor driven by a drive unit frequency converter, a six-phase winding short-circuit topology is implemented. This reduces the reactance of the short-circuit loop by using six-phase windings, thereby increasing the short-circuit current. Furthermore, under the same current, the torque generated by the six-phase windings is greater than that generated by the three-phase windings, thus increasing the short-circuit braking torque by approximately 5% or more. Additionally, when forming a dual three-phase or six-phase permanent magnet synchronous motor driven by a drive unit frequency converter, a six-phase winding short-circuit topology is implemented with a smaller skew angle. This reduces the reactance of the short-circuit loop by using six-phase winding short-circuit and increases the no-load back EMF by using a smaller skew angle. This increases the short-circuit current through a lower reactance of the short-circuit loop and a higher no-load back EMF. Under the same current, the torque generated by the six-phase windings is greater than that generated by the three-phase windings, thus increasing the short-circuit braking torque by approximately 10% or more. Therefore, the power density of the permanent magnet synchronous motor for elevators is further increased, its size is reduced, and its cost is lowered.

[0032] The specific control process of the control method for the permanent magnet synchronous motor for elevators according to the present invention will be described below with reference to specific embodiments of the present invention: Furthermore, in some embodiments of the present invention, such as Figure 2 As shown, the drive unit is a three-phase frequency converter. The main switch includes a first main switch K1 disposed between the three-phase frequency converter and the first three-phase winding. The first three-phase winding includes a first phase winding U1, a second phase winding V1, and a third phase winding W1. The second three-phase winding includes a fourth phase winding U2, a fifth phase winding V2, and a sixth phase winding W2. The first phase winding U1, the second phase winding V1, the third phase winding W1, the fourth phase winding U2, the fifth phase winding V2, and the sixth phase winding W2 are connected to form a three-phase system, as shown. Figure 3 As shown, the method includes: S201, when the elevator uses a permanent magnet synchronous motor, the first main switch is closed and the first short-circuit switch and the second short-circuit switch are opened, forming a three-phase permanent magnet synchronous motor driven by a three-phase frequency converter, thus realizing motor drive.

[0033] It is understood that, in this embodiment of the present invention, as Figure 2 As shown, when the elevator permanent magnet synchronous motor is running, by closing the first main switch K1 and opening the first short-circuit switch K2 corresponding to the first three-phase winding and the second short-circuit switch K3 corresponding to the second three-phase winding, a three-phase permanent magnet synchronous motor driven by a three-phase frequency converter is formed, thereby realizing motor drive.

[0034] S202 When the three-phase frequency converter fails, the first main switch is opened and the first short-circuit switch and the second short-circuit switch are closed, so that the first three-phase winding and the second three-phase winding form independent closed circuits respectively, so as to generate braking torque through the short-circuit current of the six-phase winding and realize the short-circuit braking of the motor.

[0035] It is understood that, in this embodiment of the present invention, as Figure 2 As shown, when a three-phase frequency converter malfunctions, by disconnecting the first main switch and closing the first short-circuit switch K1 corresponding to the first three-phase winding and the second short-circuit switch K2 corresponding to the second three-phase winding, the first three-phase winding and the second three-phase winding respectively form independent closed circuits, so as to generate braking torque through the short-circuit current of the six-phase winding and realize the short-circuit braking of the motor.

[0036] Optionally, in the above-described embodiments of the present invention, the permanent magnet synchronous motor for elevators includes motors with 12 slots and 10 poles, 12 slots and 14 poles, and integer multiples thereof, and adopts stator core skewed slots or rotor permanent magnet skewed poles (or misaligned poles) to reduce cogging torque and torque fluctuation. In addition, based on the torque pulsation of the three-phase permanent magnet synchronous motor, the skewed slot angle is determined to be 60° / pole pair.

[0037] Furthermore, in some embodiments of the present invention, such as Figure 4As shown, the drive unit is a six-phase frequency converter. The main switches include a second main switch K111 located between the six-phase frequency converter and the first three-phase winding, and a third main switch K112 located between the six-phase frequency converter and the second three-phase winding. The first three-phase winding includes a first phase winding U1, a second phase winding V1, and a third phase winding W1. The second three-phase winding includes a fourth phase winding U2, a fifth phase winding V2, and a sixth phase winding W2. The first phase winding U1, the second phase winding V1, the third phase winding W1, the fourth phase winding U2, the fifth phase winding V2, and the sixth phase winding W2 are connected to form a double three-phase or six-phase configuration, as shown. Figure 5 As shown, the method includes: S301: When the elevator uses a permanent magnet synchronous motor, the second and third main switches are closed, and the first and second short-circuit switches are opened, forming a six-phase permanent magnet synchronous motor driven by a six-phase frequency converter, thus realizing motor drive.

[0038] It is understood that, in this embodiment of the present invention, as Figure 4 As shown, when the elevator permanent magnet synchronous motor is running, by closing the second main switch K111 and the third main switch K112, and opening the first short-circuit switch K2 corresponding to the first three-phase winding and the second short-circuit switch K3 corresponding to the second three-phase winding, a three-phase permanent magnet synchronous motor driven by a six-phase frequency converter is formed, thereby realizing motor drive.

[0039] S302 When the six-phase frequency converter malfunctions, the second and third main switches are opened, and the first and second short-circuit switches are closed, so that the first three-phase winding and the second three-phase winding form independent closed circuits respectively, so as to generate braking torque through the short-circuit current of the six-phase winding and realize the short-circuit braking of the motor.

[0040] It is understood that, in this embodiment of the present invention, as Figure 4 As shown, when the six-phase frequency converter malfunctions, by disconnecting the second main switch K111 and the third main switch K112, and closing the first short-circuit switch K2 corresponding to the first three-phase winding and the second short-circuit switch K3 corresponding to the second three-phase winding, the first three-phase winding and the second three-phase winding respectively form independent closed circuits, so as to generate braking torque through the short-circuit current of the six-phase winding, thereby realizing short-circuit braking of the motor.

[0041] Optionally, in the above embodiments of the present invention, the permanent magnet synchronous motor for elevators includes motors with 12 slots and 10 poles, 12 slots and 14 poles, and integer multiples thereof, and adopts stator core skewed slots or rotor permanent magnet skewed poles (or misaligned poles) to reduce cogging torque and torque fluctuation. In addition, based on the torque pulsation of the six-phase permanent magnet synchronous motor, the skewed slot angle is determined to be 30° / pole pair.

[0042] It should be understood that, due to the complexity and high cost of six-phase drives, existing motors typically employ three-phase windings and three-phase drives, and also use a three-phase winding topology during braking. However, the torque ripple of a three-phase winding topology is mainly a six-pulse wave, requiring a skew angle of 60° / pole pairs to reduce torque ripple and meet the smoothness requirements of elevator drives. However, this skew angle causes the no-load back EMF to decrease compared to the case without skew, thus reducing braking torque. Therefore, in this embodiment of the invention, when using six-phase windings and six-phase drives, since the torque ripple is a twelve-pulse wave, the skew angle can be further reduced by half, i.e., the skew angle is set to 30° / pole pairs. This allows for meeting the smoothness requirements of elevator drives while simultaneously increasing the winding coefficient by halving the skew angle, thereby increasing the no-load back EMF and further improving the braking torque during short circuits.

[0043] Furthermore, in some embodiments of the present invention, the first phase winding U1, the second phase winding V1 and the third phase winding W1 are spatially separated by 120° electrical angles, and the fourth phase winding U2, the fifth phase winding V2 and the sixth phase winding W2 are respectively lagging behind the first phase winding U1, the second phase winding V1 and the third phase winding W1 by 30° electrical angles.

[0044] It is understood that, in this embodiment of the present invention, by making the first phase winding U1, the second phase winding V1 and the third phase winding W1 spatially out of phase by 120° electrical angle, and by making the fourth phase winding U2, the fifth phase winding V2 and the sixth phase winding W2 lag behind the first phase winding U1, the second phase winding V1 and the third phase winding W1 by 30° electrical angle respectively, the magnetic field harmonics are optimized and the braking stability is improved.

[0045] Optionally, in some embodiments of the present invention, an electromagnetic contactor, or an electronic switch composed of an IGBT or MOSFET, is used as the first short-circuit switch K2 and the second short-circuit switch K3, thereby facilitating timely response to control signals to achieve rapid braking of the motor.

[0046] In summary, according to the control method for a permanent magnet synchronous motor for elevators according to embodiments of the present invention, when a drive unit malfunctions, the main switch is disconnected, and the first short-circuit switch and the second short-circuit switch are closed. This causes the first three-phase winding and the second three-phase winding to form independent closed circuits, thereby generating braking torque through the short-circuit current of the six-phase windings and achieving short-circuit braking of the motor. This increases the short-circuit braking torque of the motor, thereby further increasing the power density, reducing the size, and lowering the cost of the permanent magnet synchronous motor for elevators.

[0047] Based on the computer-readable storage medium of the foregoing embodiments of the present invention, thereon stores a control program for a permanent magnet synchronous motor for elevators. When the control program for the permanent magnet synchronous motor for elevators is executed by a processor, it implements the control method for the permanent magnet synchronous motor for elevators of the foregoing embodiments of the present invention.

[0048] It should be understood that the specific implementation of the computer-readable storage medium in the embodiments of the present invention corresponds one-to-one with the specific implementation of the control method for permanent magnet synchronous motors for elevators in the foregoing embodiments of the present invention. To reduce redundancy, it will not be described again here.

[0049] In summary, according to the computer-readable storage medium of the present invention, by executing the control program of the permanent magnet synchronous motor for elevator stored thereon, the short-circuit braking torque of the motor can be improved, thereby enabling the permanent magnet synchronous motor for elevator to further improve power density, reduce size, and lower cost.

[0050] Figure 6 This is a block diagram of a control device for a permanent magnet synchronous motor for elevators according to an embodiment of the present invention.

[0051] Specifically, in some embodiments of the present invention, such as Figure 6 As shown, the control device 2000 for a permanent magnet synchronous motor for elevators includes a drive module 10 and a braking module 20.

[0052] The drive module 10 is used to control the main switch to close and the first short-circuit switch and the second short-circuit switch to open when the elevator permanent magnet synchronous motor is running, so as to form a three-phase, double three-phase or six-phase permanent magnet synchronous motor driven by the drive unit frequency converter, thereby realizing motor drive; the braking module 20 is used to control the main switch to open and the first short-circuit switch and the second short-circuit switch to close when the drive unit fails, so that the first three-phase winding and the second three-phase winding form independent closed circuits respectively, so as to generate braking torque through the short-circuit current of the six-phase winding, thereby realizing short-circuit braking of the motor.

[0053] Furthermore, in some embodiments of the present invention, the drive unit is a three-phase frequency converter. The main switch includes a first main switch disposed between the three-phase frequency converter and the first three-phase winding. The first three-phase winding includes a first phase winding, a second phase winding, and a third phase winding. The second three-phase winding includes a fourth phase winding, a fifth phase winding, and a sixth phase winding. The first phase winding, the second phase winding, the third phase winding, the fourth phase winding, the fifth phase winding, and the sixth phase winding are connected to form a three-phase system. The drive module 10 is also used to control the first main switch to close and control the first short-circuit switch and the second short-circuit switch to open when the elevator permanent magnet synchronous motor is running, thereby forming a three-phase permanent magnet synchronous motor driven by the three-phase frequency converter to achieve motor drive. The braking module 20 is also used to control the first main switch to open and control the first short-circuit switch and the second short-circuit switch to close when the three-phase frequency converter malfunctions, so that the first three-phase winding and the second three-phase winding form independent closed circuits respectively, so as to generate braking torque through the short-circuit current of the six-phase winding to achieve short-circuit braking of the motor.

[0054] Furthermore, in some embodiments of the present invention, the drive unit is a six-phase frequency converter. The main switch includes a second main switch disposed between the six-phase frequency converter and the first three-phase winding and a third main switch disposed between the six-phase frequency converter and the second three-phase winding. The first three-phase winding includes a first phase winding, a second phase winding, and a third phase winding. The second three-phase winding includes a fourth phase winding, a fifth phase winding, and a sixth phase winding. The first phase winding, the second phase winding, the third phase winding, the fourth phase winding, the fifth phase winding, and the sixth phase winding are connected to form a dual three-phase or six-phase configuration. The drive module 10 is also used for... When the elevator uses a permanent magnet synchronous motor, the second and third main switches are closed, and the first and second short-circuit switches are opened, forming a six-phase permanent magnet synchronous motor driven by a six-phase frequency converter, thus achieving motor drive. The braking module 20 is also used to, when the six-phase frequency converter fails, to open the second and third main switches and close the first and second short-circuit switches, so that the first three-phase winding and the second three-phase winding form independent closed circuits respectively, so as to generate braking torque through the short-circuit current of the six-phase winding, thereby achieving short-circuit braking of the motor.

[0055] Furthermore, in some embodiments of the present invention, the first phase winding, the second phase winding, and the third phase winding are spatially separated by 120° electrical angles, and the fourth phase winding, the fifth phase winding, and the sixth phase winding lag behind the first phase winding, the second phase winding, and the third phase winding by 30° electrical angles, respectively.

[0056] It should be understood that the specific implementation of the control device 1000 for the elevator permanent magnet synchronous motor in this embodiment of the invention corresponds one-to-one with the specific implementation of the control method for the elevator permanent magnet synchronous motor in the foregoing embodiments of the invention. To reduce redundancy, it will not be described again here.

[0057] In summary, the control device for an elevator permanent magnet synchronous motor according to an embodiment of the present invention, when the elevator permanent magnet synchronous motor is running, controls the main switch to close via the drive module and controls the first short-circuit switch and the second short-circuit switch to open, forming a three-phase, double three-phase, or six-phase permanent magnet synchronous motor driven by the drive unit via frequency conversion, thereby achieving motor drive. Furthermore, when the drive unit malfunctions, the braking module controls the main switch to open and controls the first short-circuit switch and the second short-circuit switch to close, causing the first three-phase winding and the second three-phase winding to form independent closed circuits respectively, generating braking torque through the short-circuit current of the six-phase winding, thereby achieving short-circuit braking of the motor. This improves the short-circuit braking torque of the motor, thereby further increasing the power density, reducing the size, and lowering the cost of the elevator permanent magnet synchronous motor.

[0058] Figure 7 This is a block diagram of a permanent magnet synchronous motor for elevators according to an embodiment of the present invention.

[0059] Specifically, in some embodiments of the present invention, the elevator permanent magnet synchronous motor 1000 adopts stator core skewed slots or rotor permanent magnet skewed poles, such as... Figure 7 As shown, the permanent magnet synchronous motor 1000 for elevators includes a drive unit 100, a main switch K, a first three-phase winding 200, the first three-phase winding 200 including a first phase winding U1, a second phase winding V1 and a third phase winding W1, a first short-circuit switch K2 corresponding to the first three-phase winding 200, a second three-phase winding 300, the second three-phase winding 300 including a fourth phase winding U2, a fifth phase winding V2 and a sixth phase winding W2, and a second short-circuit switch K3 corresponding to the second three-phase winding 300.

[0060] The drive unit 100 is configured to drive the elevator permanent magnet synchronous motor 1000 by frequency conversion through the first three-phase winding 200 and the second three-phase winding 300; the main switch K is configured to connect the drive unit with the first three-phase winding 200 and / or the second three-phase winding 300 when closed; the first short-circuit switch K2 corresponding to the first three-phase winding 200 is configured to connect the first phase winding U1, the second phase winding V2 and the third phase winding W2 into an independent closed loop when closed; the second short-circuit switch K2 corresponding to the second three-phase winding 300 is configured to connect the fourth phase winding U2, the fifth phase winding V2 and the sixth phase winding W2 into an independent closed loop when closed.

[0061] Specifically, in some embodiments of the present invention, such as Figure 2 As shown, the drive unit is a three-phase frequency converter. The main switch includes a first main switch K1 disposed between the three-phase frequency converter and the first three-phase winding. The first phase winding U1, the second phase winding V1, the third phase winding W1, the fourth phase winding U2, the fifth phase winding V2 and the sixth phase winding W2 are connected to form a three-phase system.

[0062] It should be understood that, in this embodiment of the present invention, the permanent magnet synchronous motor for elevators includes motors with 12 slots and 10 poles, 12 slots and 14 poles, and integer multiples thereof, and adopts stator core skewed slots or rotor permanent magnet skewed poles (or misaligned poles) to reduce cogging torque and torque fluctuation.

[0063] It should be noted that in the above embodiments of the present invention, since the short-circuit current of the six-phase winding is higher than that of the three-phase winding, it can provide higher braking torque for the motor, thereby enabling the permanent magnet synchronous motor for elevators to further improve power density, reduce size, and lower cost.

[0064] Furthermore, in some embodiments of the present invention, such as Figure 4 As shown, the drive unit is a six-phase frequency converter. The main switch includes a second main switch K111 disposed between the six-phase frequency converter and the first three-phase winding and a third main switch K112 disposed between the six-phase frequency converter and the second three-phase winding. The first phase winding U1, the second phase winding V1, the third phase winding W1, the fourth phase winding U2, the fifth phase winding V2 and the sixth phase winding W2 are connected to form a double three-phase or six-phase configuration.

[0065] Furthermore, in some embodiments of the present invention, the skew angle of the stator core skew slot is 30° / pole pair.

[0066] It should be noted that in the above embodiments of the present invention, since the coupling between the six-phase windings is weaker than that between the three-phase windings, the equivalent impedance of the short-circuit circuit is lower, and the six-phase winding motor can use a smaller skew angle to increase the no-load back EMF, the winding short-circuit current of the six-phase windings is higher than that of the three-phase windings. Moreover, under the same current, the torque generated by the six-phase windings is greater than that generated by the three-phase windings. Therefore, it can provide higher braking torque for the motor while satisfying the stability of the elevator traction machine. As a result, the power density of the permanent magnet synchronous motor for elevators can be further improved, the size can be reduced, and the cost can be lowered.

[0067] In summary, according to the embodiments of the present invention, when the drive unit of the elevator permanent magnet synchronous motor malfunctions, the main switch is disconnected, and the first short-circuit switch and the second short-circuit switch are closed. This causes the first three-phase winding and the second three-phase winding to form independent closed circuits, thereby generating braking torque through the short-circuit current of the six-phase windings and achieving short-circuit braking of the motor. This increases the short-circuit braking torque of the motor, thereby further increasing the power density, reducing the size, and lowering the cost of the elevator permanent magnet synchronous motor.

[0068] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0069] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0070] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0071] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0073] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0074] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0075] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A control method for a permanent magnet synchronous motor for elevators, characterized in that, The elevator permanent magnet synchronous motor includes a drive unit, a main switch, a first three-phase winding, a first short-circuit switch corresponding to the first three-phase winding, a second three-phase winding, and a second short-circuit switch corresponding to the second three-phase winding. The method includes: When the elevator permanent magnet synchronous motor is running, the main switch is closed and the first short-circuit switch and the second short-circuit switch are opened, forming a three-phase, double three-phase or six-phase permanent magnet synchronous motor driven by the drive unit frequency converter, thereby realizing motor drive; When the drive unit malfunctions, the main switch is opened and the first and second short-circuit switches are closed, so that the first three-phase winding and the second three-phase winding form independent closed circuits respectively, so as to generate braking torque through the short-circuit current of the six-phase winding and realize short-circuit braking of the motor.

2. The control method for a permanent magnet synchronous motor for elevators according to claim 1, characterized in that, The drive unit is a three-phase frequency converter. The main switch includes a first main switch disposed between the three-phase frequency converter and the first three-phase winding. The first three-phase winding includes a first phase winding, a second phase winding, and a third phase winding. The second three-phase winding includes a fourth phase winding, a fifth phase winding, and a sixth phase winding. The first phase winding, the second phase winding, the third phase winding, the fourth phase winding, the fifth phase winding, and the sixth phase winding are connected to form a three-phase system. The method includes: When the elevator permanent magnet synchronous motor is running, the first main switch is closed and the first short-circuit switch and the second short-circuit switch are opened, forming a three-phase permanent magnet synchronous motor driven by the three-phase frequency converter, thereby realizing motor drive; When the three-phase frequency converter malfunctions, the first main switch is opened and the first and second short-circuit switches are closed, so that the first three-phase winding and the second three-phase winding form independent closed circuits respectively, so as to generate braking torque through the short-circuit current of the six-phase winding and realize short-circuit braking of the motor.

3. The control method for a permanent magnet synchronous motor for elevators according to claim 1, characterized in that, The drive unit is a six-phase frequency converter. The main switch includes a second main switch disposed between the six-phase frequency converter and the first three-phase winding, and a third main switch disposed between the six-phase frequency converter and the second three-phase winding. The first three-phase winding includes a first phase winding, a second phase winding, and a third phase winding. The second three-phase winding includes a fourth phase winding, a fifth phase winding, and a sixth phase winding. The first phase winding, the second phase winding, the third phase winding, the fourth phase winding, the fifth phase winding, and the sixth phase winding are connected to form a dual three-phase or six-phase configuration. The method includes: When the elevator permanent magnet synchronous motor is running, the second main switch and the third main switch are closed, and the first short-circuit switch and the second short-circuit switch are opened, forming a six-phase permanent magnet synchronous motor driven by the six-phase frequency converter, thereby realizing motor drive; When the six-phase frequency converter malfunctions, the second main switch and the third main switch are opened, and the first short-circuit switch and the second short-circuit switch are closed, so that the first three-phase winding and the second three-phase winding form independent closed circuits respectively, so as to generate braking torque through the short-circuit current of the six-phase winding and realize short-circuit braking of the motor.

4. The control method for a permanent magnet synchronous motor for elevators according to claim 2 or 3, characterized in that, The first phase winding, the second phase winding, and the third phase winding are spatially separated by 120° electrical degrees, and the fourth phase winding, the fifth phase winding, and the sixth phase winding are each 30° electrical degrees behind the first phase winding, the second phase winding, and the third phase winding.

5. A computer-readable storage medium, characterized in that, It stores a control program for a permanent magnet synchronous motor for elevators, which, when executed by a processor, implements the control method for a permanent magnet synchronous motor for elevators as described in any one of claims 1-4.

6. A control device for a permanent magnet synchronous motor for elevators, characterized in that, The elevator permanent magnet synchronous motor includes a drive unit, a main switch, a first three-phase winding, a first short-circuit switch corresponding to the first three-phase winding, a second three-phase winding, and a second short-circuit switch corresponding to the second three-phase winding. The device includes: The drive module is used to control the main switch to close and the first short-circuit switch and the second short-circuit switch to open when the elevator permanent magnet synchronous motor is running, so as to form a three-phase, double three-phase or six-phase permanent magnet synchronous motor driven by the drive unit frequency conversion, thereby realizing motor drive; The braking module is used to control the main switch to open and control the first short-circuit switch and the second short-circuit switch to close when the drive unit fails, so that the first three-phase winding and the second three-phase winding form independent closed circuits respectively, so as to generate braking torque through the short-circuit current of the six-phase winding and realize the short-circuit braking of the motor.

7. A permanent magnet synchronous motor for elevators, characterized in that, The elevator permanent magnet synchronous motor employs stator core skewed slots or rotor permanent magnet skewed poles. The elevator permanent magnet synchronous motor includes a drive unit, a main switch, and a first three-phase winding. The first three-phase winding includes a first phase winding, a second phase winding, and a third phase winding, a first short-circuit switch corresponding to the first three-phase winding, and a second three-phase winding. The second three-phase winding includes a fourth phase winding, a fifth phase winding, and a sixth phase winding, and a second short-circuit switch corresponding to the second three-phase winding. The drive unit is configured to drive the elevator permanent magnet synchronous motor by frequency conversion through the first three-phase winding and the second three-phase winding; The main switch is configured to connect the drive unit to the first three-phase winding and / or the second three-phase winding when closed; The first short-circuit switch corresponding to the first three-phase winding is configured to connect the first phase winding, the second phase winding and the third phase winding into an independent closed circuit when closed; The second short-circuit switch corresponding to the second and third phase windings is configured to connect the fourth phase winding, the fifth phase winding, and the sixth phase winding into an independent closed loop when closed.

8. The permanent magnet synchronous motor for elevators according to claim 7, characterized in that, The drive unit is a three-phase frequency converter, and the main switch includes a first main switch disposed between the three-phase frequency converter and the first three-phase winding, wherein the first phase winding, the second phase winding, the third phase winding, the fourth phase winding, the fifth phase winding and the sixth phase winding are connected to form a three-phase system.

9. The permanent magnet synchronous motor for elevators according to claim 7, characterized in that, The drive unit is a six-phase frequency converter. The main switch includes a second main switch disposed between the six-phase frequency converter and the first three-phase winding and a third main switch disposed between the six-phase frequency converter and the second three-phase winding. The first phase winding, the second phase winding, the third phase winding, the fourth phase winding, the fifth phase winding and the sixth phase winding are connected to form a double three-phase or six-phase configuration.

10. The permanent magnet synchronous motor for elevators according to claim 9, characterized in that, The skew angle of the stator core skew slot is 30° / pole pair.

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