CN217881207U - Electromagnetic actuator and electric product comprising same - Google Patents

Abstract

The utility model provides an electromagnetic actuator, this electromagnetic actuator includes: a movable iron core; the coil is used for driving the movable iron core; a coil drive circuit for the coil, which includes a power switch connected in series with the coil and a control circuit connected to the power switch and controlling on and off of the power switch; and the azimuth detector is arranged on the electromagnetic actuating mechanism and is connected with the control circuit so as to generate an azimuth detection signal according to the current azimuth of the electromagnetic actuating mechanism, and the control circuit receives the azimuth detection signal so as to control the on and off of the power switch. The utility model also provides an electric product, it includes as before the electromagnetism actuating mechanism.

Description

Electromagnetic actuator and electric product comprising same

Technical Field

The utility model provides an electromagnetic actuator and an electric product including this electromagnetic actuator.

Background

Many mechanical switches rely on electromagnets as actuators in many products today, particularly in low voltage power distribution products. Typical products are, for example, electromagnetic contactors, or automatic transfer switches with electromagnets as drive mechanisms, etc. Such low voltage power distribution products need to be installed in a number of orientations. In addition to the most common forward mounting (e.g., common backplane mounting), there may be a need for reverse mounting (backplane mounting but rotated 180 degrees), backplane mounting but rotated 90 degrees, backplane mounting but rotated 270 degrees, other angle mounting, horizontal mounting, and ceiling mounting, among other ways.

However, due to the existence of the gravity of the electromagnet movable iron core, the different installation directions can affect the movement speed of the electromagnet movable iron core, and further affect the required electromagnetic driving force.

For example, when the electromagnet is installed in the forward direction, the main loop switch is an upper incoming line, when the electromagnet is attracted, the moving iron core needs to overcome the self gravity, and the moving speed is relatively slow; when releasing, though mainly relying on the effect of reset spring, the movable iron core moves at a relatively fast speed due to the existence of self gravity.

When the electromagnet is installed reversely, the main loop switch is fed with the line downwards, and when the electromagnet is attracted, the moving iron core does not need to overcome the gravity of the moving iron core, so that the moving speed is relatively high; when releasing, although the action of the return spring is mainly relied on, the moving iron core still needs to overcome the self gravity when moving, and the moving speed is relatively slow.

In the prior art, in order to meet the difference of installation directions, the driving force of the electromagnet needs to be designed to ensure reliable attraction under the worst condition (in the forward installation), which inevitably needs larger electromagnetic force and further needs larger electromagnet coil driving current.

However, according to this conventional design, if the same driving current as that in the forward mounting is still applied to the electromagnet coil when the product is mounted in the reverse direction, an excessive amount of residual energy is generated, and the driving force for the movable iron core is increased, which may cause unnecessary impact on mechanical parts, thereby further affecting the reliability of the product.

SUMMERY OF THE UTILITY MODEL

To the problem and the demand mentioned above, the utility model provides a novel technical scheme, it has solved above-mentioned problem owing to adopted following technical characteristics to bring other technological effects.

The utility model provides an electromagnetic actuator, this electromagnetic actuator includes: a movable iron core; the coil is used for driving the movable iron core; a coil drive circuit for the coil, which includes a power switch connected in series with the coil and a control circuit connected to the power switch and controlling on and off of the power switch; and the azimuth detector is arranged on the electromagnetic actuating mechanism and is connected with the control circuit so as to generate an azimuth detection signal according to the current azimuth of the electromagnetic actuating mechanism, and the control circuit receives the azimuth detection signal so as to control the on and off of the power switch.

Further preferably, the electromagnetic actuator includes a circuit board, and the coil drive circuit and the orientation detector are mounted on the circuit board.

Further preferably, the orientation detector is a gyroscope or an acceleration sensor.

Further preferably, the orientation detector is a single axis acceleration sensor or a three axis acceleration sensor.

Further preferably, the control circuit comprises a control chip, an input pin of which is connected to an output pin of the orientation detector.

Further preferably, the power switch comprises an insulated gate bipolar transistor or a metal oxide semiconductor field effect transistor.

Further preferably, the electromagnetic actuator further includes a current detection circuit connected to the power switch and the control circuit, the current detection circuit detecting a current flowing through the power switch to generate a current detection signal, and inputting the current detection signal to the control circuit.

Further preferably, the coil driving circuit further includes a switch driving circuit connected to the power switch and the control circuit to drive the power switch according to a switching signal from the control circuit.

Further preferably, the electromagnetic actuator further includes a voltage sampling circuit connected to an input power supply of the coil and the control circuit, the voltage sampling circuit sampling a voltage of the input power supply to generate a voltage sampling signal, and inputting the voltage sampling signal to the control circuit.

The utility model also provides an electric product, it includes as before the electromagnetic actuator.

Further preferably, the electrical product is an automatic transfer switch or an electromagnetic contactor.

The utility model provides an improvement to the structure of the electromagnetic actuator who is used for various electric products, increased the orientation detector who links to each other with control circuit in its coil drive circuit promptly. Compared with the prior art of the electromagnetic actuator and the electrical product without the orientation detector, the installation orientation of the electromagnetic actuator and the electrical product can be detected after the orientation detector is introduced. And then can be through the control circuit who is connected with the position detector according to different installation positions, control the electric current that flows through the electro-magnet drive coil, reach the purpose that realizes best electromagnetic drive power, optimize overall design. The situation that the traditional mode only depends on increasing the design allowance to meet different installation directions is avoided, and the problem that the reliability of a mechanical system is influenced due to excessive residual electromagnetic driving energy in different directions is solved.

Drawings

Fig. 1 is a schematic diagram of an electromagnetic actuator in accordance with a preferred embodiment of the present invention;

fig. 2 is a schematic diagram of a connection relationship between the orientation detector and the control chip of the control circuit according to the preferred embodiment of the present invention.

Detailed Description

In order to make the purpose, technical scheme and advantage of the technical scheme of the utility model clearer, will combine in the following the utility model discloses the drawing of concrete embodiment is right the technical scheme of the embodiment of the utility model carries out clear, complete description. Like reference symbols in the various drawings indicate like elements. It should be noted that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.

Possible embodiments within the scope of the invention may have fewer parts, have other parts not shown in the figures, different parts, differently arranged parts or differently connected parts, etc. than the examples shown in the figures. In addition, two or more of the components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

Unless defined otherwise, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. When the number of components is not specified, the number of components may be one or more; also, the terms "a," "an," "the," and the like, do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but does not exclude other elements or items. The terms "mounted," "disposed," "connected," or "coupled" and the like are not restricted to physical or mechanical mounting, disposing, and connecting, but may include electrical mounting, disposing, and connecting, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships when the apparatus is in use or positional relationships shown in the drawings, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

The utility model provides an electromagnetic actuator, this electromagnetic actuator can the wide application in various electric products that relate to with electric energy conversion to mechanical energy, for example automatic transfer switch (be used for its divide-shut brake operation), electromagnetic contactor (be used for its contact operation). Furthermore, the utility model also provides an electric product, it includes according to the utility model discloses an electromagnetic actuator.

As shown in fig. 1, an electromagnetic actuator according to a preferred embodiment of the present invention mainly includes: a moving core, a coil (i.e., an electromagnet coil), a coil drive circuit for the coil, and an orientation detector.

The coil is used for driving the movable iron core by electromagnetic force when current flows through the coil. The coil driving circuit (as shown by a dotted line frame in fig. 1) mainly includes: the power switch is connected with the coil in series, and the control circuit is connected with the power switch and controls the on and off of the power switch.

Specifically, the control circuit outputs switching signals (for example, PWM signals, that is, pulse width modulation signals, which will be described later) with different duty ratios to control the on and off of the power switch, so as to modulate the current flowing through the coil, thereby achieving the purpose of adjusting the electromagnetic driving force on the movable iron core.

The orientation detector may be mounted on any suitable portion of the electromagnetic actuator, such as a housing, a frame, a PCB (as described later) or the like of the electromagnetic actuator, and since the relative positions of the electromagnetic actuator and the product disposed inside the product are fixed, the orientation of the electromagnetic actuator may be obtained. The direction detector is connected with the control circuit to generate a direction detection signal according to the current direction of the electromagnetic actuator, and the control circuit receives the direction detection signal to control the on and off of the power switch, namely, the current flowing through the coil is dynamically adjusted through the control circuit to dynamically adjust the electromagnetic driving force of the moving iron core.

The condition of need with the position installation of difference under different occasions to the electric product that uses electromagnetic actuator, the utility model provides a structure to electromagnetic actuator improves, has increased the position detector to coil drive circuit promptly to can detect the position of electric product based on the electromagnetic actuator who so constructs, can judge this electric product (electromagnetic actuator) and be in forward installation, reverse installation, still angle installation for the direction of gravity at present based on the electromagnetic actuator who so constructs promptly, and then can adjust the electromagnetic drive power to moving the iron core according to the position of electric product.

Further preferably, the electromagnetic actuator according to the present invention comprises a circuit board (PCB), and the coil driving circuit and the orientation detector are mounted on the circuit board. Further, the circuit board may be used to mount other electronic devices, circuits, etc. (such as current sampling circuits, voltage sampling circuits, etc. described later) that are described herein or not described in detail.

Further preferably, the orientation detector may be a gyroscope or an acceleration sensor. In the preferred embodiment shown in the figures, it is preferred to use an acceleration sensor as the orientation detector for the automatic transfer switch. Specifically, the acceleration sensor is located in an orientation corresponding to the orientation of the electromagnetic actuator, and the signal output by the acceleration sensor may be used by the control circuit to dynamically control the turning on and off of the power switch.

Further preferably, the orientation detector may be a single axis acceleration sensor or a three axis acceleration sensor, or any other suitable type of acceleration sensor. In the preferred embodiment shown in fig. 2, an acceleration sensor of the ADXL345 type is chosen. ADXL345 is an ultra low power 3-axis accelerometer with high resolution (13 bits) and a measurement range of +/-16g. Accessible through SPI or I2C digital interfaces.

Further preferably, the control circuit may include a control chip, such as a single chip microcomputer of a suitable type, and an input pin of the control chip is connected to a corresponding output pin of the orientation detector, as shown in fig. 2. Thus, the control chip may directly receive the output signal from the orientation detector (ADXL 345) to dynamically control the turning on and off of the control power switch in accordance with the signal.

Further preferably, the power switch may be any suitable power semiconductor switching device, including for example an Insulated Gate Bipolar Transistor (IGBT) or a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), etc.

Further preferably, the coil driving circuit may further include a switch driving circuit connected to the power switch and the control circuit. The switch driving circuit includes necessary circuit components so that a switching signal (e.g., a PWM signal) output from the control chip can be subjected to necessary processing such as amplification/conversion by the switch driving circuit to properly achieve turning on and off of the power switch.

Further preferably, the electromagnetic actuator further includes a current detection circuit connected to the power switch and the control circuit, the current detection circuit detecting a current flowing through the power switch (i.e., detecting a current flowing through the coil) to generate a current detection signal, and inputting the current detection signal to the control circuit. Thus, the control circuit can further automatically adjust the switching signal output by the control circuit according to the current detection signal.

Further preferably, the electromagnetic actuator further includes a voltage sampling circuit connected to the input power supply of the coil and the control circuit, the voltage sampling circuit sampling a voltage of the input power supply to generate a voltage sampling signal, and inputting the voltage sampling signal to the control circuit. The control circuit can further automatically adjust the output switching signal according to the voltage sampling signal. It is to be understood that the input power source to the coil refers to any suitable ac/dc power source for inputting power to the coil, for example, for an automatic transfer switch, it may be the grid voltage source to which the automatic transfer switch is series connected. And the input power supply can be connected to the electromagnet coil and other devices needing power through a necessary rectifying and filtering circuit.

Exemplary embodiments of the present disclosure have been described in detail hereinabove with reference to preferred embodiments, however, it will be understood by those skilled in the art that various modifications and changes may be made to the specific embodiments described above, and various combinations of the various features and structures presented in the disclosure may be made without departing from the concept of the present disclosure, without departing from the scope of the disclosure, which is defined by the appended claims.

Claims (11)

1. An electromagnetic actuator, comprising:

a movable iron core;

the coil is used for driving the movable iron core;

a coil drive circuit for the coil, which includes a power switch connected in series with the coil and a control circuit connected to the power switch and controlling on and off of the power switch;

and the azimuth detector is arranged on the electromagnetic actuating mechanism and is connected with the control circuit so as to generate an azimuth detection signal according to the current azimuth of the electromagnetic actuating mechanism, and the control circuit receives the azimuth detection signal so as to control the on and off of the power switch.

2. The electromagnetic actuator of claim 1 comprising a circuit board, and wherein the coil drive circuit and the orientation detector are mounted on the circuit board.

3. The electromagnetic actuator of claim 1, wherein the orientation detector is a gyroscope or an acceleration sensor.

4. The electromagnetic actuator of claim 1, wherein the orientation detector is a single axis acceleration sensor or a three axis acceleration sensor.

5. The electromagnetic actuator of claim 1, wherein the control circuit comprises a control chip having an input pin coupled to an output pin of the orientation detector.

6. The electromagnetic actuator of claim 1, wherein the power switch comprises an insulated gate bipolar transistor or a metal oxide semiconductor field effect transistor.

7. The electromagnetic actuator of claim 1, further comprising a current sensing circuit connected to the power switch and the control circuit, the current sensing circuit sensing a current flowing through the power switch to generate a current sensing signal, and inputting the current sensing signal to the control circuit.

8. The electromagnetic actuator of claim 1, wherein the coil drive circuit further comprises a switch drive circuit coupled to the power switch and the control circuit to drive the power switch in accordance with a switching signal from the control circuit.

9. The electromagnetic actuator of claim 1, further comprising a voltage sampling circuit connected to the input power source of the coil and the control circuit, the voltage sampling circuit sampling a voltage of the input power source to generate a voltage sampling signal, and inputting the voltage sampling signal to the control circuit.

10. An electrical product comprising an electromagnetic actuator according to any of claims 1-9.

11. An electrical product according to claim 10, wherein the electrical product is an automatic transfer switch or an electromagnetic contactor.

Images