Motor braking circuit during power failure
By designing a short circuit breaker mechanism of parallel circuits and normally closed switches in the motor, the motor rotates at high speed and generates impedance force during power outages or failures, preventing elevators and other equipment from falling or pushing, solving the problem that the existing technology cannot effectively prevent the motor equipment from falling or falling or pushing. Promoted issues, improving security and mobility.
Patent Information
- Application Number
- CN202411559681.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2024-12-20
AI Technical Summary
When existing motors are powered off or malfunctioning, they cannot effectively prevent elevators, cranes and other equipment from falling or being pushed away by artificially, resulting in safety hazards.
Design a motor brake circuit during power outage, adopts two sets of lines connected in parallel to permanent magnet motors, short-circuit when the power supply is stopped by normal-closed switch, and opens when power supply is supplied, ensuring that the motor rotates at high speed through the second set of lines during power outage or failure. Generates induced electromotive force and generates impedance force to prevent falling or pushing.
Effectively prevent elevators, cranes and other equipment from falling or being pushed during power outages or failures, improving safety, avoiding the loss of control caused by controller failure, and separating the power drive through manual switches to facilitate movement.
Smart Images
Figure CN119171778A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a motor control circuit, in particular to a motor braking circuit capable of preventing falling and pushing during power outage. Background Art
[0002] Today's life and production cannot be separated from motors, and motors may experience power outages or motor failures during use. When the motor fails or fails, the motor will stop working due to power loss. At this time, when elevators, cranes, electric doors, etc. carry people or objects, there is a risk of falling due to gravity. Existing structures are generally equipped with emergency braking devices, but these emergency braking devices have delays and sometimes fail, which cannot effectively prevent the problem of falling. In some electric doors and gates that require motors as power, when there is a power outage or motor failure, they will be pushed open manually, thus creating a safety hazard. Summary of the invention
[0003] In order to solve the above problems, the present invention aims to provide a motor braking circuit which can prevent falling and pushing during power outage.
[0004] The present invention is achieved through the following technical measures: a motor braking circuit during power outage, including a permanent magnet motor, wherein two groups of lines are connected in parallel to the input end of the permanent magnet motor, wherein the first group of lines is powered by a controller, and the controller is powered by a power line, and the second group of lines of the permanent magnet motor is short-circuited by a normally closed switch, and the normally closed switch is connected to the power line; when the power supply stops, the normally closed switch short-circuits the second group of lines, and when the power supply is supplied, the normally closed switch disconnects the second group of lines.
[0005] As a preferred embodiment, the permanent magnet motor is a single-phase ordinary permanent magnet motor or a three-phase permanent magnet synchronous motor.
[0006] As a preferred embodiment, the normally closed switch is a normally closed electromagnetic switch.
[0007] As a preferred embodiment, the permanent magnet motor is a single-phase motor; when the power supply is cut off, the normally closed switch loses power, and after the normally closed switch loses power, the two groups of normally closed switches are closed, short-circuiting the second group of line ends of the permanent magnet motor; when the power supply is powered on, the normally closed switch is energized, and after the normally closed switch is energized, the two groups of normally closed switches are disconnected, and the second group of line ends of the permanent magnet motor are disconnected.
[0008] As a preferred embodiment, the permanent magnet motor is a three-phase motor; when the power supply is cut off, the normally closed switch loses power, and after the normally closed switch loses power, the three groups of normally closed switches are closed, short-circuiting the second group of line ends of the permanent magnet motor; when the power supply is powered on, the normally closed switch is energized, and after the normally closed switch is energized, the three groups of normally closed switches are disconnected, and the second group of line ends of the permanent magnet motor are disconnected.
[0009] As a preferred embodiment, a manual switch is provided on the main circuit or the second group of circuits of the permanent magnet motor.
[0010] When the present invention is working normally, the normally closed switch is powered off, the second group of line ends of the permanent magnet motor are short-circuited, and the first group of lines supplies power to the permanent magnet motor. At this time, the permanent magnet motor works normally, such as elevators, cranes, electric doors, etc.; when power outages or failures occur, the first group of lines stops supplying power to the permanent magnet motor, and the normally closed switch is simultaneously de-energized and closed, and the ends of each line of the permanent magnet motor are short-circuited through the second group of lines. At this time, when the elevator, crane, electric door, etc. fall or are pushed manually, the deceleration mechanism drives the permanent magnet motor M to rotate at a high speed in the reverse direction (the magnetic field and the coil cut the magnetic line of force to generate an induced electromotive force), that is, it is converted into a generator. At this time, due to the short circuit of the motor, the impedance force generated inside the motor is not easy to rotate, and the damping effect is generated to avoid the damage caused by the fall or inertial movement of the elevator, crane, electric door, etc. The permanent magnet motor can be a single-phase ordinary permanent magnet motor or a three-phase permanent magnet synchronous motor. The normally closed switch of the circuit is directly connected to the power line, which avoids the problem of loss of control caused by the failure of the controller when the normally closed switch is connected to the controller. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 The schematic diagram of the circuit of a single-phase ordinary permanent magnet motor according to an embodiment of the present invention.
[0012] Figure 2 The schematic diagram of the circuit of the three-phase permanent magnet synchronous motor according to the embodiment of the present invention.
[0013] Figure 3 The schematic diagram of the circuit of a common permanent magnet motor with a manual switch according to an embodiment of the present invention.
[0014] Figure 4 The schematic diagram of the circuit of a three-phase permanent magnet synchronous motor with a manual switch according to an embodiment of the present invention. DETAILED DESCRIPTION
[0015] The present invention will be further described in detail below in conjunction with the embodiments and with reference to the accompanying drawings.
[0016] A motor braking circuit during power failure in this embodiment, please refer to the attached Figures 1 to 4 , including a permanent magnet motor M, wherein two groups of lines are connected in parallel to the input end of the permanent magnet motor M, wherein the first group of lines is powered by a controller, the controller is powered by a power line, and the second group of lines of the permanent magnet motor M is short-circuited by a normally closed switch K, and the normally closed switch K is connected to the power line; when the power supply stops, the normally closed switch K short-circuits the second group of lines, and when the power supply is supplied, the normally closed switch K disconnects the second group of lines.
[0017] When the equipment is working normally, the normally closed switch K is energized and disconnected, the second group of lines of the permanent magnet motor M is short-circuited, and the first group of lines supplies power to the permanent magnet motor M. At this time, the permanent magnet motor M works normally, such as elevators, cranes, electric doors, etc.; when a power outage or a fault occurs, the first group of lines stops supplying power to the permanent magnet motor M, and the normally closed switch K is de-energized and closed at the same time, and the ends of each line of the permanent magnet motor M are short-circuited through the second group of lines. At this time, when the elevator, crane, electric door, etc. fall or are pushed manually, the deceleration mechanism drives the permanent magnet motor M to rotate at high speed in the reverse direction (the magnetic field and the coil cut the magnetic lines of force to generate induced electromotive force), that is, it is converted into a generator. At this time, due to the short circuit of the motor, the impedance force generated inside the motor is not easy to rotate, and the damping effect is generated to avoid the damage caused by the fall or inertial movement of the elevator, crane, electric door, etc. The permanent magnet motor M can be a single-phase ordinary permanent magnet motor (reference Figure 1 and Figure 3 ) can also be a three-phase permanent magnet synchronous motor (reference Figure 2 and Figure 4 ), the normally closed switch K of this circuit is directly connected to the power line, avoiding the problem of loss of control caused by connecting the normally closed switch K to the controller when the controller fails.
[0018] In order to move the working equipment even when power outage or failure occurs, a clutch mechanism can be added to separate the elevator, crane, electric door, etc. from the power drive of the motor, so that the elevator, crane, electric door, etc. will not generate induced electromotive force inside the motor when moving. A manual switch SW can also be set on the main circuit or the second group of circuits of the motor, please refer to Figure 3-4 Normally, the manual switch SW is in a closed state. When the elevator, crane, electric door, etc. need to be moved due to a power outage or failure, the manual switch SW is opened. The elevator, crane, electric door, etc. will not generate induced electromotive force inside the motor when moving, which facilitates movement. The manual switch SW is best set on the second group of lines to avoid accidentally touching the switch and causing the motor to stop under normal working conditions.
[0019] In an embodiment of a motor braking circuit during a power outage, please refer to Figure 1-4 On the basis of the foregoing technical solution, specifically, the normally closed switch K may be a normally closed electromagnetic switch.
[0020] The above is an explanation of the motor braking circuit during power outage of the present invention to help understand the present invention, but the implementation mode of the present invention is not limited to the above-mentioned embodiments. Any changes, modifications, substitutions, combinations, and simplifications made without departing from the principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.
Claims
1. A motor braking circuit during power outage, characterized in that: It includes a permanent magnet motor, wherein the input end of the permanent magnet motor is connected in parallel with two groups of circuits, wherein the first group of circuits is powered by a controller, the controller is powered by a power line, and the second group of circuits of the permanent magnet motor is short-circuited by a normally closed switch, and the normally closed switch is connected to the power line; When the power source stops supplying power, the normally closed switch short-circuits the second group of lines, and when the power source supplies power, the normally closed switch disconnects the second group of lines.
2. The motor braking circuit during power outage according to claim 1, characterized in that: The permanent magnet motor is a common permanent magnet motor or a three-phase permanent magnet synchronous motor.
3. The motor braking circuit during power failure according to claim 1, characterized in that: The normally closed switch is a normally closed electromagnetic switch.
4. The motor braking circuit during power failure according to claim 1, characterized in that: The permanent magnet motor is a single-phase motor; when the power fails, the normally closed switch loses power, and after the normally closed switch loses power, the two groups of normally closed switches close to short-circuit the second group of line ends of the permanent magnet motor; When the power supply is powered on, the normally closed switch is energized, and after the normally closed switch is energized, the two groups of normally closed switches are disconnected, and the end of the second group of lines of the permanent magnet motor is disconnected.
5. The motor braking circuit during power failure according to claim 1, characterized in that: The permanent magnet motor is a three-phase motor; when the power supply is cut off, the normally closed switch loses power, and after the normally closed switch loses power, the three groups of normally closed switches are closed, short-circuiting the second group of line ends of the permanent magnet motor; when the power supply is powered on, the normally closed switch is energized, and after the normally closed switch is energized, the three groups of normally closed switches are disconnected, and the second group of line ends of the permanent magnet motor are disconnected.
6. The motor braking circuit during power failure according to claim 1, characterized in that: A manual switch is arranged on the main circuit or the second group of circuits of the permanent magnet motor.