CN202043064U

CN202043064U - Motor load protection system

Info

Publication number: CN202043064U
Application number: CN2011201679238U
Authority: CN
Inventors: 罗顺华; 刘涛; 刘荣
Original assignee: CHENGDU M & S TECHNOLOGY Co Ltd
Current assignee: CHENGDU M & S TECHNOLOGY Co Ltd
Priority date: 2011-05-24
Filing date: 2011-05-24
Publication date: 2011-11-16
Anticipated expiration: 2021-05-24

Abstract

The utility model discloses a motor load protection system, which belongs to the technical field of motors and mainly resolves the problem that when the motor powers off, the load cannot stop moving so that the load is damaged and the like in the prior art. The motor load protection system comprises a motor, a motor driving device connected with the motor and a relay connected with the motor and the motor driving device respectively. The motor load protection system can not only be simple in circuit structure, easy to manufacture, low in cost and beneficial for popularization and application, but also realize an immediate brake of the load when the motor powers off suddenly, thereby effectively avoiding the harm caused by the movements such as inertia of the load when the motor powers off.

Description

A kind of motor load protection system

Technical field

The utility model relates to technical field of motors, specifically, relates to a kind of motor load protection system.

Background technology

Current, in the motor device of market sale, the equipment with load protection function seldom.In reality was used or produced, the suspension hook of crane or the hanging basket of hoist engine all required quick location; The main shaft of universal milling machine requires and can shut down rapidly; Lift needs safeguard protection and accurately positioning control after having a power failure suddenly, these situations all require motor can realize braking to respective load immediately when outage.But; when motor carries above-mentioned load movement; because sudden power; there is not the load of protection system will under effects such as gravity, centrifugal force, inertia, continue motion a period of time or distance just can stop; and in the continuation motion process of load; must increase the wearing and tearing of load and system, when serious even damage load, cause heavy losses.In order to address this is that; the scheme that people have designed motor band-type brake, multiple-speed gear-box etc. realizes the protection to load; but the cost of these protection schemes is all very high; and such equipment mostly and the demand of multiple load in the practical application be not complementary; therefore be not suitable for scheme is carried out large-scale promotion application, to such an extent as to can't satisfy the growing market demand.

The utility model content

The purpose of this utility model is to provide a kind of motor load protection system, overcomes the defective that exists in the prior art, and load is braked immediately when realizing outage, thereby reaches the purpose of protection load.

To achieve these goals, the technical solution adopted in the utility model is as follows:

A kind of motor load protection system comprises motor, and the motor driver that is connected with this motor, simultaneously, also is provided with respectively the relay that is connected with motor driver with motor.

Say further, be provided with rotor winding one and rotor winding two in the described motor, relay inside is provided with two common ports, and respectively with two normally-closed contacts that common port is corresponding, the two ends of rotor winding one are connected with common port normally-closed contact corresponding with this common port respectively, and the two ends of rotor winding two are connected with corresponding normally-closed contact with another common port respectively.

Say that further the model of described motor driver is THB7128; The model of described relay is G5V-2.

Principle of the present utility model is that because motor two group rotor windings are connected on respectively on two groups of normally-closed contacts and the common port, under the cold situation of relay coil, relay switch is in normally closed position, rotor winding two terminal shortcircuits; Because load is moved by the external force effect, and the drive rotor rotates together, thereby generation induced current, and the magneticaction that this induced current produces is with opposite in the moment of inertia direction of epitrochanterian moment of inertia and load movement generation, make this magnetic force stop rotor motion, and then finish braking load.When relay coil is switched on, relay switch is in the normally open position, this moment, the output of motor driver was connected with the rotor winding two ends of motor respectively, the motor operate as normal, because motor driver place circuit can short circuit in energising moment, and just drive signal is delayed time a little, therefore can not influence operate as normal.

Compared with prior art, the beneficial effects of the utility model are:

1. the utility model circuit structure is simple, is easy to make;

2. the utility model is with low cost, possesses large-scale promotion and Application feasibility;

3. the utility model is under the situation of sudden power, owing to can produce one and rotor rotation direction and load movement direction opposite effect power in the motor-spin-coil, thereby stop rotor and load to continue motion, prevented that effectively load from continuing motion and wearing and tearing with system, avoided load to damage, guaranteed its useful life because of friction;

4. load can be braked immediately in the utility model, and load is owing to factors such as gravity, centrifugal force, inertia continue other harm that motion produces when having avoided outage effectively.

Description of drawings

Fig. 1 is a circuit block diagram of the present utility model;

Fig. 2 is the circuit block diagram of the utility model-embodiment.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

Embodiment

As shown in Figure 1, a kind of motor load protection system comprises motor, motor driver and relay.

Motor driver is selected THB7128 type driver for use in the present embodiment, and relay is selected G5V-2 type relay for use.As shown in Figure 2, load is connected with motor, establishes two groups of rotor windings that place stator field in the motor, is respectively rotor winding one and rotor winding two.Motor driver, motor and relay three's concrete annexation is as follows:

At first the pin function that the present embodiment repeat circuit is used describes: pin 4 and 13 is two common ports, and pin 6 and 11 is two normally-closed contacts, and pin one and 16 is a power input, and pin 8 and 9 is exported into end for power supply.The output OUT1A of motor driver is connected with the pin 8 of relay, and output OUT1B is connected with the pin 6 of relay, and an end of rotor winding one is connected with the output OUT1B of motor driver, and the other end is connected with the pin 4 of relay; The output OUT2A of motor driver-be connected with the pin 9 of relay, output OUT2B-be connected with the pin one 1 of relay, an end of rotor winding two is connected with the pin one 1 of relay, and the other end is connected with the pin one 3 of relay.Under the cold situation of the coil of relay, relay switch is in normally closed position, and promptly the pin 4 of relay and pin 6 are communicated with, and pin one 1 and pin one 3 are communicated with, and at this moment, rotor winding one and rotor winding two two ends all are in short-circuit condition.

The utility model course of work:

When the coil electricity of relay, the pin 4 of relay and pin 8 are communicated with, the rotor winding one of motor is communicated with output OUT1A, the OUT1B of motor driver respectively, pin 9 and pin one 3 are communicated with simultaneously, the rotor winding two of motor respectively with the output OUT2A of motor driver-, OUT2B-connection, this moment, motor was in normal operating conditions, and motor driver place circuit short circuit phenomenon can not occur in the moment of switching on, and occurs the time-delay phenomenon of short time at most.Therefore only because the relay operating time be a millisecond rank, drive signal need be done a little a bit and be delayed time, operate as normal that just can proof load.

When external power source disconnected, the coil of relay also disconnected suddenly, and the pin 4 of relay and pin 6 are communicated with, and cause one short circuit of rotor winding; The pin one 1 of relay and pin one 3 are communicated with, and cause two short circuits of rotor winding.At this moment, load under the influence of factors such as inertia and will continue motion a period of time, because the rotor of load and motor is connected, therefore, the motion of load will drive rotor and be rotated further, and rotor places stator field, and rotor rotation promptly is that coil is done cutting magnetic line movement.According to electromagnetic induction principle, will produce induced current in the epitrochanterian coil, and two rotor windings all are in short-circuit condition, this induced current will flow through epitrochanterian coil.According to the right-hand rule; the magneticaction that this induced current produces is with opposite in the moment of inertia direction of epitrochanterian moment of inertia and load movement generation; so this active force will stop rotor motion; and then make the also stop motion of load that links to each other with rotor; be that motor and load realize braking simultaneously substantially; thereby load after having avoided effectively cutting off the power supply and the friction between the system all are effectively protected motor, load.

According to the foregoing description, just can realize the utility model well, and execution mode of the present utility model includes but not limited to the foregoing description.

Claims

1. a motor load protection system comprises motor, and the motor driver that is connected with this motor, it is characterized in that, also is provided with respectively the relay that is connected with motor driver with motor.

2. a kind of motor load protection system according to claim 1; it is characterized in that; be provided with rotor winding one and rotor winding two in the described motor; relay inside is provided with two common ports; and respectively with two normally-closed contacts that common port is corresponding; the two ends of rotor winding one are connected with common port normally-closed contact corresponding with this common port respectively, and the two ends of rotor winding two are connected with corresponding normally-closed contact with another common port respectively.

3. a kind of motor load protection system according to claim 2 is characterized in that the model of described motor driver is THB7128.

4. a kind of motor load protection system according to claim 3 is characterized in that the model of described relay is G5V-2.