CN210327418U

CN210327418U - Power-off self-locking motor system

Info

Publication number: CN210327418U
Application number: CN201921254055.XU
Authority: CN
Inventors: 费凯成; 王驰; 金彪; 罗浩珏
Original assignee: Nanjing Kangni Intelligent Control Technology Co ltd
Current assignee: Nanjing Kangni Intelligent Control Technology Co ltd
Priority date: 2019-08-05
Filing date: 2019-08-05
Publication date: 2020-04-14
Anticipated expiration: 2029-08-05

Abstract

The utility model discloses a outage self-locking motor system, including in-wheel motor, driver and outage self-locking device, outage self-locking device has included the relay that is connected to on-wheel motor phase line, and the coil control pin of relay is connected on the driver, outage self-locking device is still including establishing ties the unlocking device on the relay, unlocking device is used for the manual circuit disconnection with the relay. The utility model provides an at present in-wheel motor system can't carry out the not enough of unblock when the outage, can enough provide sufficient resistance when the outage and make motor speed reduce controllable state, reduce the risk that the stall brought, can carry out artifical unblock again, satisfy the functional requirement that the outage was carried out to can provide the function that unblock state detected like mechanical brake.

Description

Power-off self-locking motor system

Technical Field

The utility model relates to a motor system, especially a outage self-locking motor system.

Background

In a device using an in-wheel motor (a dc brush motor or a dc brushless motor) as a power output, particularly, an electric wheelchair, an elderly scooter, an electric vehicle, an AGV, a logistics cart, or the like, when the device is on a slope, if an unexpected power failure occurs, and if no brake device is provided, a dangerous situation such as a stall occurs, and therefore, it is very necessary to add a power failure self-locking device to the device. For example at present in electronic wheelchair or old vehicle trade of riding instead of walk, the stopper of the mechanical type of generally adopting is as outage self-locking mechanism, use the stopper as outage self-locking mechanism though can provide better braking effect when the outage, but its is with high costs, the mounting means is complicated, generally need the motor to use the reducing gear box and provide certain reduction ratio, consequently hardly use it to in-wheel motor, and in-wheel motor is with low costs, the controllability is good, light in weight, fast, simple to operate, if can solve in-wheel motor outage braking problem, then can reduce the whole car cost of wheelchair or vehicle of riding instead of walk to a great extent, promote the competitiveness of product.

At present, a method of short-circuit motor phase line is adopted in a hub motor to achieve the effect of deceleration braking in power failure, but the method does not consider the pushing of the motor in the power failure condition, for example, when the electric quantity of a battery is exhausted, the motor can only be locked by electromagnetism, and manual pushing cannot be carried out.

Disclosure of Invention

The purpose of the invention is as follows: the to-be-solved technical problem of the utility model is to provide a outage self-locking motor system, solved present wheel hub motor system can't carry out the not enough of unblock when the outage, can enough provide the resistance when the outage and make motor speed reduce controllable state, reduce the risk that the stall brought, can carry out artifical unblock again, satisfy the functional demand that the outage was carried out to can provide the function that unblock state detected like mechanical brake.

The technical scheme is as follows: outage self-locking motor system, including in-wheel motor, driver and outage self-lock device, outage self-lock device has included the relay that is connected to on-wheel motor phase line, the coil control pin of relay is connected on the driver, outage self-lock device still includes the unlocking device of establishing ties on the relay, unlocking device is used for manual circuit disconnection with the relay.

Furthermore, the relay is a manual control type relay, and the unlocking device is a manual control device of the relay.

Further, the relay comprises a normally closed contact which is not connected to a phase line of the hub motor, and a pin of the normally closed contact is connected to an unlocking signal detection interface of the driver.

Furthermore, an unlocking device on the relay is a self-locking button.

Furthermore, the self-locking button comprises a contact which is not connected to a phase line of the hub motor, and a pin of the contact is connected to an unlocking signal detection interface of the driver.

Furthermore, the self-locking button is one of a 2NC/2NO self-locking button, a 3NC/3NO self-locking button and an emergency stop switch.

Has the advantages that: the system has the following advantages:

firstly, the system can effectively decelerate and brake in a sudden power failure state during operation, can unlock after reaching a safe state after deceleration, is convenient for manual pushing, cannot directly brake the motor like a mechanical brake, for example, the mechanical brake on the wheelchair can directly lock the motor when power failure occurs accidentally, and the wheelchair is easy to tip over or throw away a patient;

secondly, the locking and unlocking states of the motor can be detected, so that the operation is safer;

thirdly, the implementation mode is simple, the system is convenient to reform based on the existing system, the outage self-locking device and the driver can be combined together for use, and the system can also be used independently in a plug-in mode, so that the existing equipment can be conveniently reformed.

Drawings

FIG. 1 is a schematic circuit diagram of embodiment 1;

FIG. 2 is a schematic circuit diagram of embodiment 2;

FIG. 3 is a schematic circuit diagram of embodiment 3;

FIG. 4 is a schematic circuit diagram of embodiment 4;

FIG. 5 is a schematic circuit diagram of embodiment 5.

Detailed Description

Outage self-locking motor system, including in-wheel motor 1, driver and outage self-lock device, outage self-lock device has included relay 2 that is connected to on-wheel motor 1 phase line, and relay 2's coil control pin is connected on the driver, outage self-lock device still includes the unlocking device of establishing ties on relay 2, unlocking device is used for manual circuit disconnection with relay 2. The system mainly utilizes the normally closed contacts of the monostable relay, if the direct current brush motor is connected, two phase lines of the direct current brush motor are respectively connected to two groups of normally closed contacts of the relay 2, if the direct current brushless motor is connected, three phase lines of the direct current brush motor are respectively connected to three groups of normally closed contacts of the relay 2, the other ends of the two or three groups of normally closed contacts are in short circuit, and the motor is decelerated and braked by the counter electromotive force generated by the rotation of the motor through the phase lines of the short circuit motor. The control coil of the relay 2 is connected to the brake control signal of the motor drive (this can be used in the current motor drive supporting the brake mechanism) or to the power supply terminal of the drive (the relay coil is powered on together with the drive at start-up). When the former mode is used, the relay 2 can be independently controlled through the driver, when the motor 1 is ready to operate, the relay 2 is electrified, the phase line short circuit of the motor 1 is released, and the normal control of electrifying the motor phase line is driven to realize the operation of the motor 1; when the motor 1 stops, the relay 2 can be powered off, so that the power consumption is reduced; if the driver is powered off accidentally when the motor runs, the normally closed contact of the relay 2 is conducted to short-circuit the phase line of the motor 1, so that the rotating resistance of the motor is greatly increased, and the braking effect is achieved; when the latter mode is used, after the driver is powered on, the relay 2 is directly powered on, the short circuit of the phase line of the motor 1 is released, and when the power-off or accidental power failure occurs, the normally closed contact of the relay 2 is conducted, the phase line of the motor 1 is in short circuit, and the speed reduction braking is performed.

The monostable relay is divided into two schemes of a common type and a type with manual control, the common type relay controls a normally closed contact to be disconnected by electrifying a coil, a self-locking button needs to be connected in series to serve as an unlocking device, and therefore the short circuit of a motor phase line can be disconnected by disconnecting the contact of the self-locking button under the condition that the relay coil is not electrified. Example 1 is a conventional relay applied to a dc brushless motor, and the circuit connection is as shown in fig. 1. U, V, W phase lines of the motor 1 are connected to three groups of normally closed contacts of the relay 2, the other ends of the three groups of normally closed contacts are in short circuit, and coil control pins A1 and A2 of the relay 2 are connected to a brake or relay control interface of the driver. The unlocking device connected in series on the relay 2 is a self-locking button 4, and the self-locking button 4 can be a 3NC/3NO self-locking button or an emergency stop switch. In a normal state, the self-locking button 4 is in a conducting state, when power is cut off accidentally, the coil of the relay 2 is powered off, and a phase line of the motor is in short circuit for braking; after the power-off braking, when the motor is in a safe state, if the motor is required to be unlocked, the self-locking button 4 is switched to a disconnected state, and three phase lines of the motor 1 are disconnected in a short circuit mode, so that the motor can be pushed conveniently. The embodiment 1 lacks the function of detecting the unlock state, and is suitable for a system which does not need to detect the unlock state.

When some equipment with higher safety requirements is started for use, a motor driver needs to be capable of detecting whether a phase line lock of a motor is in an unlocking state, if the phase line lock is in the unlocking state, a user needs to be prompted to use the unlocking device after the phase line lock is locked, and otherwise, the motor cannot be ensured to be capable of braking when power is accidentally cut off. Here, another set of free contacts of the latching button 4 of the same pattern as the shorted motor phase line (e.g., NO or NC) can be strung in for use as an unlock detection signal. Embodiment 2 is a system to which an unlock state detection function is added, and circuit connections thereof are as shown in fig. 2. The latching button 4 comprises a contact 41 which is not connected to the phase line of the hub motor 1, and the pin of the contact 41 is connected to the unlocking signal detection interface of the driver. E. F is two pins of the free contact 41 of the latching button 4, and the E, F end is connected to the unlocking detection interface of the driver, so that the unlocking detection function can be realized.

When the relay is a relay with a manual control type, the normally closed contact of the relay is disconnected through a button or a mechanical device on the relay, so that the relay can be unlocked directly through the button or the mechanical device on the relay. Embodiment 3 is a manual control device 3 with a manual control type relay applied to a brushless dc motor, the unlocking device is a relay, U, V, W three phase lines of the motor 1 are connected to three groups of normally closed contacts of the relay 2, the other ends of the three groups of normally closed contacts are short-circuited, a1 and a2 are connected to a brake or a relay control interface of a driver, C, D is two pins of the other normally closed contact of the relay 2, and C, D is connected to an unlocking signal detection interface of the driver. The working principle is as follows: in a normal state, the manual control device 3 is in a locking state, namely when a coil of the relay 2 is not electrified, a normally closed contact of the manual control device is in a conducting state, after a driver is electrified, the coil of the relay 2 is not electrified, whether the manual control device 3 is in the locking state can be judged by detecting whether an C, D end is conducted, when the manual control device 3 is in the unlocking state, a user is prompted that a motor is unlocked, when the manual control device 3 is in the locking state, when the driver needs to operate the motor, the coil of the relay 2 is firstly electrified, the normally closed contact of the relay 2 is opened, at the moment, three-phase short circuit of U, V, W of the motor is relieved, the motor can normally operate, and after the motor is completely stopped, the coil of the relay; if the motor is suddenly powered off in operation, the coil of the relay 2 is powered off, the normally closed contact of the relay 2 is closed, three phase lines of the motor are in short circuit, and power-off braking is realized; after the power failure, if the motor is required to be unlocked, the manual control device 3 is unlocked, and the normally closed contact of the relay 2 is switched on and off.

Embodiments 4 and 5 are connected by a direct current brush motor, the phase line is two A, B, the normally closed contact to which the corresponding relay 2 is connected is 2 groups, the connection mode is shown in fig. 4 and 5, and the working principle is similar to that of

embodiments

2 and 3.

Claims

1. The utility model provides a power failure self-locking motor system, includes in-wheel motor (1), driver and power failure self-locking device, power failure self-locking device has included relay (2) that are connected to in-wheel motor (1) phase line, its characterized in that: the coil control pin of relay (2) is connected on the driver, and outage self-lock device still includes the unlocking device who establishes ties on relay (2), unlocking device is used for the manual circuit disconnection with relay (2).

2. The power-off self-locking motor system according to claim 1, wherein: the relay (2) is a manual control type relay, and the unlocking device is a manual control device (3) of the relay.

3. The power-off self-locking motor system according to claim 2, wherein: the relay (2) comprises a normally closed contact (21) which is not connected to a phase line of the hub motor (1), and a pin of the normally closed contact (21) is connected to an unlocking signal detection interface of the driver.

4. The power-off self-locking motor system according to claim 1, wherein: the unlocking device on the relay (2) is a self-locking button (4).

5. The power-off self-locking motor system according to claim 4, wherein: the self-locking button (4) comprises a contact (41) which is not connected to a phase line of the hub motor (1), and a pin of the contact (41) is connected to an unlocking signal detection interface of the driver.

6. The power-off self-locking motor system according to claim 4, wherein: the self-locking button (4) is one of a 2NC/2NO self-locking button, a 3NC/3NO self-locking button and an emergency stop switch.