Controlled cascade electric actuator with liquid current terminal

FIELD: electricity.

SUBSTANCE: invention refers to cascade electric actuators of rotational movement, which consist at least of two asynchronous motors of the same type, and can be used at creation of electric actuators with controlled rotation speed from nominal to double nominal at constant moment, or actuators with double moment at constant nominal rotation speed, as well as at creation of other types of electric actuators. Controlled cascade electric actuator includes two electric motors coaxially installed in housing, each of which consists of rotor and stator; besides, stator of the first electric motor is fixed on housing, and its rotor is fixed on its shaft; fastening rings two of which are fixed on the housing, and the other one is fixed on shaft of the first electric motor, electromagnetic clutches fixed on the housing of electric actuator, three-phase power supply system; rotor of the second electric motor is movable and installed so that it can be freely rotated relative to its shaft, and stator of the second electric motor is fixed on its shaft. Fastening ring rigidly fixed on housing of controlled cascade electric actuator on which there installed are three fixed friction semi-clutches one of which has the possibility of being pulled in order to fix the friction gasket (installed on the first shaft) of its movable semi-clutch sliding along splined recesses of electric motor shaft with freely rotating rotor; the other semi-clutch has the possibility of being pulled in order to fix to the same friction gasket of its semi-clutch entering the cavity of housing of movable rotor, which is coaxial to the above semi-clutch, and the third semi-clutch has the possibility of being pulled in order to fix to the other friction gasket fixed on the electric actuator housing of its semi-clutch entering the cavity of movable rotor housing, which is coaxial to the above semi-clutch.

EFFECT: improved design of cascade electric actuator due to operation improvement of system of electromagnetic clutches and power supply system of one of asynchronous motors, which provides obtaining of high rotation speeds close to double nominal, at nominal value of moment or obtaining of double moment at nominal rotation speed.

3 cl, 1 dwg

 

The invention relates to a cascade of electrical drives rotational motion, comprising, for example, two of the same type of induction motors, and can be used to create direct-drive electric actuators with variable speed from nominal to double the rated constant torque or drives with double the torque at a constant nominal speed of rotation, as well as when using any other types of electric drives.

Known electric AC motors with squirrel-cage or wound rotor have only a nominal speed of rotation and torque on a shaft. Twice the speed of rotation is achieved by the use of different gears, which complicates the electric actuator and reduces its reliability. Double time is achieved by using the same engines on one shaft, which increases the weight and dimensions of the electric actuator. However, the application of these two methods does not solve the problem of getting double speed at constant torque or twice the torque at a constant speed in one device.

Known asynchronous electric motor with squirrel cage rotor and stator phase windings [Kopylov I.P. Electrical machines: textbook. for universities / Ispropyl. - 2nd ed, Rev.): the High. HQ., Logo, 2000. - 607 S.] Such induction motor has a rotation speed determined by the engine design and the parameters of the mains. However, this engine does not receive the doubled value of the torque on the shaft at a constant nominal speed of rotation or to get twice the value of the torque at a constant nominal speed.

Known cascade electric drive consisting of two coaxially mounted induction motors, each including an inner magnetic core on the shaft and the outer magnetic circuit system, an electromagnetic coupling. The rotors of both motors fixedly mounted on the shafts. The stator of one engine is stationary and the stator of another with the possibility of free rotation around the shaft, which is the output element of the actuator (U.S. Pat. No. 2402857, 2010)

And this device has disadvantages. Electric actuator provides for double speed at constant torque and twice the torque at a constant speed of rotation. However, the use of electromagnetic coupling without special friction pads in the form of alternating magnetic and non-magnetic concentric rings may cause undesired operation. Using the standard node of the switching-mode power supply is the water can lead to frequent failure of this node, especially at high power drive. All this reduces the reliability and probability of failure of the device that may cause undesired operation of the electric drive.

The objective of the invention is to develop a managed cascading electric actuator with liquid power collection, providing the necessary Electromechanical characteristics in more reliable operation.

The technical result is achieved by obtaining high speeds of rotation, close to twice rated at the nominal value of the moment or getting double moment at rated speed. Managed cascading electric actuator with liquid power collection containing two motor mounted in the housing coaxially, each of which consists of a rotor and stator, and the stator of the first motor is stationary and fixed to the body, and its rotor mounted on the shaft, a metal mounting rings, two of which are fixed to the body, and the third shaft of the first motor, and all three of the mounting ring is fixed, e.g. by welding, electromagnetic clutch attached to the housing of the electric actuator, three-phase power system, the rotor of the second electric motor is made movable and is mounted with the possibility of St. the free rotation relative to its shaft, and the stator of the second motor mounted on its shaft, with mounting ring rigidly fixed to the body controlled cascade drive, on which there are three stationary friction coupling, one of which has the possibility of attraction for fixing it installed on the first shaft friction lining its movable coupling, sliding in the slotted undercut the motor shaft with a freely rotating rotor, the other coupling half has a possibility of attraction to commit to the same friction lining their coupling, descending into the hollow body of the rolling rotor, coaxially with the specified coupling, and the third coupling has the possibility of attraction to commit to another fixed on the body of the actuator of the friction lining their coupling, descending into the hollow body of the rolling rotor, coaxially with the specified coupling.

Managed cascading electric drive that contains special friction pads made in the form of alternating magnetic and non-magnetic concentric rings.

Managed cascading electric drive with the shaft of the second electric motor three-phase slip ring device.

The proposed device illustrated in the drawing, figure 1 shows a General view of the device.

Cascade electric is a mini-actuator comprises an electromagnetic coupling 1, 2, 3, fixedly mounted on the ring 4. Ring 4 fixed to the body of the actuator 5, for example, by welding. The stator 6 is stationary and fixed to the body 5 and the rotor 7 is stationary and rotates with the shaft 8 on the bearings 9 regardless of the rotation of the shaft 11. The rotor 10 rotates freely on the shaft 11 regardless of the rotation of the shaft in the bearings 12. The stator 13 is rigidly fixed on the shaft 11 and rotates with the shaft on bearings 12, 14 and 15. The electromagnetic clutch 1 affects the body of the rotor 10 by means of the friction pads 16 are rigidly fixed to the body of the actuator 5, for example, by welding, and the electromagnetic clutch 2 is the effect on the body of the rotor 10 by means of the friction pads 17 rigidly mounted on the shaft 8, for example, by welding. The electromagnetic clutch 3 is connected with the shaft 11 by means of the friction pads 17. Moreover, the coupling halves 1 and 2 come in the hollow of the rotor body 10 and the coupling half 3 slides freely in the slotted undercut shaft 11. Working area of friction pads 16 and 17 should be the same, for the same performance of the electromagnetic coupling 1, 2 and 3. The stator housing 6 is rigidly fixed to the housing of the actuator 5. Supply of electric power to the stator 12 is carried out using a liquid collector device 18 rigidly mounted on the shaft 11. Tokoyama the device is protected by insulation 19, fixed to the body of the actuator 5.

The principle of operation

To get twice the value of the torque at rated speed must be controlled electromagnetic couplings in the following order. Serves the supply voltage to the electromagnetic clutch 1 and 3, and is detachable from the power supply to the electromagnetic clutch 2. When the rotor 7 rotates on the shaft 8 and the rotor 10 remains stationary, since the electromagnetic clutch 1 inhibits the rotor 10. By means of the electromagnetic clutch 3 is engaged and the stator 13, the rotating shaft 11, with the shaft 8. Finally we get double the torque on a shaft 11 from the two induction motors at rated speed.

To obtain the doubled value of the rotation speed nominal value of the torque necessary to produce the control electromagnetic couplings in the following order. Serves the supply voltage to the electromagnetic clutch 2 and turning off the electromagnetic clutch 1 and 3. When the rotor 7 rotates on the shaft 8 and transmits torque and speed to the rotor 10 by means of the electromagnetic clutch 2. The stator 13 is rotated with asynchronous velocity relative to the rotor 10. The result on the shaft 11 twice the value of the rotation speed nominal value of the torque.

The use of the proposed solutions will improve Robocop the capacity and reliability of the system electromagnetic couplings, as well as to improve the reliability of the power system of an electric drive, which will improve the reliability and performance of the cascade electric drive in General. When you increase the number of engines it will be possible to obtain higher values of torque and speed.

The invention will find application in industry, mechanical engineering, machine building, transport, etc.

1. Managed cascading electric actuator with liquid power collection containing two motor mounted in the housing coaxially, each of which consists of a rotor and stator, and the stator of the first motor is stationary and fixed to the body, and its rotor mounted on the shaft, mounting rings, two of which are fixed to the body, and the third shaft of the first motor, electromagnetic clutch attached to the housing of the electric actuator, three-phase power system, the rotor of the second electric motor is made movable and is mounted with the possibility of free rotation relative to its shaft, and the stator of the second motor is fixed on the shaft while the retaining ring rigidly fixed to the body controlled cascade drive, on which there are three stationary friction coupling, one of which has the possibility of attraction to commit to installed per the om shaft friction lining its movable coupling, sliding in the slotted undercut the motor shaft with svobodnayarussia rotor, the other coupling half has a possibility of attraction to commit to the same friction lining their coupling, descending into the hollow body of the rolling rotor, coaxially with the specified coupling, and the third coupling has the possibility of attraction for fixing to the other fixed to the body of the actuator of the friction lining their coupling, descending into the hollow body of the rolling rotor, coaxially with the specified coupling.

2. Managed cascading electric actuator according to claim 1, characterized in that the special friction pads made in the form of alternating magnetic and non-magnetic concentric rings.

3. Managed cascading electric actuator according to claim 1, characterized in that on the shaft of the second electric motor is three-phase slip ring device.



 

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