Motor braking circuit during power failure
By using a normally closed switch in the motor braking circuit to short-circuit the permanent magnet motor circuit during power outages, damping effect is generated to prevent elevators from falling, thus solving the safety hazards when the motor is powered off or malfunctions and achieving safe braking of elevators and other equipment.
Patent Information
- Application Number
- CN202422679941.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-11-04
AI Technical Summary
Existing motors pose safety hazards such as falling or being pushed away by people when there is a power outage or malfunction, and emergency braking devices have delays and malfunction risks.
A motor braking circuit is adopted in the event of a power outage. When the power supply is interrupted, the normally closed switch short-circuits the second set of circuits of the permanent magnet motor, forming a short-circuit state. This generates a damping effect to prevent elevators, cranes, electric doors, etc. from falling or being pushed by inertial motion, and generates an impedance force through induced electromotive force.
It effectively prevents elevators, cranes, electric doors, etc. from falling or being pushed when there is a power outage or malfunction, avoiding safety hazards and preventing loss of control due to controller failure.
Smart Images
Figure CN223567546U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to motor control circuit especially can prevent falling, prevent pushing motor braking circuit when power failure. BACKGROUND
[0002] Now life and production cannot leave motor, and motor will occur power failure or motor failure in application, when motor power failure or failure, motor will stop working because of power loss, at this moment when the elevator, hoist, electric door etc. are loaded with people or articles, will produce the risk of falling because of gravity, and the existing structure generally will be provided with emergency stop device, and these emergency stop devices have time delay and sometimes have failure, thereby cannot effectively prevent the problem of falling. In some electric door, barrier gate that need motor as power, when power failure or motor failure, will be pushed open by people, thereby produces the security hidden danger. SUMMARY
[0003] To solve above -mentioned problem, the utility model purposes at providing a kind of motor braking circuit when power failure can prevent falling, prevent pushing.
[0004] The utility model discloses a kind of motor braking circuit when power failure, including permanent magnet motor, the input of the permanent magnet motor is connected with two groups of lines, wherein the first group of lines is powered by controller, the controller is powered by power line, the second group of lines of the permanent magnet motor is short-circuited by normally closed switch, and the normally closed switch is connected power line;When power supply stops power supply, the normally closed switch makes the second group of lines short-circuit, when power supply, the normally closed switch makes the second group of lines open circuit.
[0005] As a preferred mode, the permanent magnet motor is single-phase permanent magnet motor or three-phase permanent magnet synchronous motor.
[0006] As a preferred mode, the normally closed switch is normally closed electromagnetic switch.
[0007] As a preferred mode, the permanent magnet motor is single-phase motor;When power supply stops power supply, normally closed switch loses power, and the second group of normally closed switches is closed after normally closed switch loses power, and the second group of lines of permanent magnet motor is short-circuited end;When power supply, normally closed switch gets power, and the second group of normally closed switches is disconnected after normally closed switch gets power, and the second group of lines of permanent magnet motor is open circuit end.
[0008] As a preferred mode, the permanent magnet motor is three-phase motor;When power supply stops power supply, normally closed switch loses power, and the second group of normally closed switches is closed after normally closed switch loses power, and the second group of lines of permanent magnet motor is short-circuited end;When power supply, normally closed switch gets power, and the second group of normally closed switches is disconnected after normally closed switch gets power, and the second group of lines of permanent magnet motor is open circuit end.
[0009] As a preferred mode, the main circuit or the second group of lines of the permanent magnet motor is provided with a manual switch.
[0010] The utility model discloses a normal work, normally closed switch gets electricity and disconnects, and the second group of lines of permanent magnet motor short circuit, and the first group of lines supplies power to permanent magnet motor, and at this time, the permanent magnet motor works normally, such as elevator, crane, electric door etc., when power failure or fault occurs, the first group of lines stops supplying power to permanent magnet motor, and normally closed switch loses electricity and closes simultaneously, and makes the end of each line of permanent magnet motor short circuit through the second group of lines, at this time, the elevator, crane, electric door etc. fall or when artificial push through the deceleration mechanism reverse drive permanent magnet motor M high speed rotation (magnetic field and coil cut magnetic force line motion produce induced electromotive force) that is converted into generator, at this time, because the motor short circuit, the impedance force in the motor is not easy to rotate, and the damping efficiency is generated, avoiding the harm caused by the falling or inertial motion of elevator, crane, electric door etc., and the permanent magnet motor can be single-phase permanent magnet motor or three-phase permanent magnet synchronous motor, and the normally closed switch of the circuit is directly connected with the power line, avoiding the out-of-control problem caused by the controller failure when connecting the normally closed switch to the controller. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 It is the circuit principle drawing of single-phase permanent magnet motor of the utility model embodiment.
[0012] Figure 2 It is the circuit principle drawing of three-phase permanent magnet synchronous motor of the utility model embodiment.
[0013] Figure 3 It is the circuit principle drawing of single-phase permanent magnet motor with manual switch of the utility model embodiment.
[0014] Figure 4 It is the circuit principle drawing of three-phase permanent magnet synchronous motor with manual switch of the utility model embodiment. DETAILED DESCRIPTION
[0015] The utility model will be further explained in detail in connection with the embodiment and by referring to the drawings.
[0016] The utility model discloses a power failure motor braking circuit, please refer to the drawing Figures 1 to 4 , including permanent magnet motor M, the input of permanent magnet motor M is connected with two groups of lines in parallel, wherein the first group of lines is powered by controller, the controller is powered by power line, the second group of lines of permanent magnet motor M is short circuited through normally closed switch K, and the normally closed switch K is connected with power line;When the power supply stops supplying power, the normally closed switch K makes the second group of lines short circuit, and when the power supply supplies power, the normally closed switch makes K second group of lines break circuit.
[0017] When the device is working normally, the normally closed switch K is powered off 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 and the like; when power failure or failure occurs, the first group of lines stops supplying power to the permanent magnet motor M, and the normally closed switch K is simultaneously powered off and closed, and the permanent magnet motor M is short-circuited through the second group of lines, at this time, the elevators, cranes, electric doors and the like fall or are manually pushed to drive the permanent magnet motor M to rotate at high speed (the magnetic field and the coil cut the magnetic force lines to move to generate induced electromotive force), that is, the permanent magnet motor M becomes a generator, at this time, the motor is short-circuited, and the internal impedance force of the motor is not easy to rotate, and damping effect is generated to avoid damage caused by the falling or inertial movement of the elevators, cranes, electric doors and the like, and the permanent magnet motor M can be a single-phase permanent magnet motor (refer to Figure 1 and Figure 3 ) or a three-phase permanent magnet synchronous motor (refer to Figure 2 and Figure 4 ), the normally closed switch K of the circuit is directly connected to the power line, and the problem of loss of control caused by connecting the normally closed switch K to the controller when the controller fails is avoided.
[0018] In order to move the working device when power failure or failure occurs, a clutch mechanism can be additionally provided to separate the elevators, cranes, electric doors and the like from the power drive of the motor, so that the elevators, cranes, electric doors and the like will not generate induced electromotive force in the motor when moving. A manual switch SW can also be provided on the main line or the second group of lines of the motor, please refer to Figures 3-4 , the manual switch SW is in a closed state at ordinary times, when power failure or failure occurs and the elevators, cranes, electric doors and the like need to be moved, the manual switch SW is opened, and the elevators, cranes, electric doors and the like will not generate induced electromotive force in the motor when moving, which is convenient for moving, and the manual switch SW is preferably provided on the second group of lines, so as to avoid the motor from stopping due to the accidental touch of the switch under normal working conditions.
[0019] In an embodiment of the motor braking circuit when power failure occurs, please refer to Figures 1-4 , on the basis of the foregoing technical solutions, the normally closed switch K can be a normally closed electromagnetic switch.
[0020] The above describes the motor braking circuit when power failure occurs of the utility model, which is used to help understand the utility model, but the implementation manner of the utility model is not limited by the above embodiment, any change, modification, replacement, combination, simplification made without departing from the principle of the utility model should be an equivalent replacement manner, and all are included in the protection scope of the utility model.
Claims
1. A motor braking circuit during power failure, characterized by: The permanent magnet motor is connected with two groups of lines in parallel, the first group of lines is powered by a controller, the controller is powered by a power line, 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 with the power line; When the power supply stops supplying power, the normally closed switch short-circuits the second group of lines, and when the power supply supplies power, the normally closed switch breaks the second group of lines.
2. The de-energized motor braking circuit of claim 1, wherein: The permanent magnet motor is a single-phase permanent magnet motor or a three-phase permanent magnet synchronous motor.
3. The de-energized motor braking circuit of claim 1, wherein: The normally closed switch is a normally closed electromagnetic switch.
4. The power-off motor braking circuit of claim 1, wherein: The permanent magnet motor is a single-phase motor; when the power supply stops supplying power, the normally closed switch loses power, and after the normally closed switch loses power, the two groups of normally closed switches are closed to short-circuit the end of the second group of lines of the permanent magnet motor; When the power supply supplies power, the normally closed switch gets power, and after the normally closed switch gets power, the three groups of normally closed switches are opened, and the end of the second group of lines of the permanent magnet motor is broken.
5. The power-off motor braking circuit of claim 1, wherein: The permanent magnet motor is a three-phase motor; when the power supply stops supplying power, the normally closed switch loses power, and after the normally closed switch loses power, the three groups of normally closed switches are closed to short-circuit the end of the second group of lines of the permanent magnet motor; when the power supply supplies power, the normally closed switch gets power, and after the normally closed switch gets power, the three groups of normally closed switches are opened, and the end of the second group of lines of the permanent magnet motor is broken.
6. The power-off motor braking circuit of claim 1, wherein: A manual switch is arranged on the main line or the second group of lines of the permanent magnet motor.