SU1487131A1 - Electromechanical drive system with variable rotation rate - Google Patents

Description

The invention relates to electromechanical drive systems with an asynchronous motor with a rotation speed continuously variable by electromagnetic friction clutches. The purpose of the invention is to simplify the design and increase the speed control speed. System. the drive is self-ventilated by an independent ventilation system, separate from the engine ventilation. The complex ‘of electromagnetic friction clutches has one ferromagnetic disc, driven both during braking and during coupling with the help of a number of springs, washers and electromagnets in motion. 2 hp ff, 4 ill.

The purpose of the invention is to simplify the design, increase the speed control speed. >.

FIG. 1 shows a block diagram of an electromechanical system of a variable speed drive with electronically controlled driving a working machine; Fig / 2 - the actual section of the drive system with two electromagnets; in fig. 3 is a cross section of an electromechanical drive system with a coupling electromagnet;

| In FIG. 4 - section of the electromechanical drive system with brake ¹

an electromagnet.

50. ,, 1487131

3

1487131

four

The electromechanical system consists of the actual drive system 1 of the working machine 2, on the axis of which the rotation speed sensor 3 and the electronic control circuit 4 are permanently attached, which operate in the speed control loop. The power part of the proprietary drive system 1 is an asynchronous motor with a squirrel-cage rotor 5 of the current production, and the clutch complex consists of a flywheel 6, the inertia of which is calculated in accordance with the load impact at the coupling and dynamics moments provided by the electronic control circuit 4 of the coupling electromagnet 7 containing a winding embedded in the shield 8, and a brake electromagnet 9, consisting of a winding 2θ ki embedded in the shield 10; between electromagnets 7 and 9 there is a disk 11 with ventilation slots, on which two rings 12,13 of friction material are placed. 25

Friction ring 12 mounted on the disk 11 from the side of the flywheel 6, provides the perception of the rotational motion of the flywheel. Friction ring 13 on the other side of the disk provides its inhibition by friction on the shield 10.

Depending on the command received, the disk 11 moves in the grooves made on the drive axle 14, either from the side of the flywheel 6, providing $$ grip, or with. side of the shield 10, providing braking. The entire set of clutches is installed in the housing 15, through which is attached to the flange of the engine 5.

As part of the actual drive system 1, the clutch complex (FIG. 2) includes a flywheel 6 rigidly attached to the power axis 16, a disk 11 radially rigidly attached to the drive axis 14, electromagnets 7 and 9 independently ventilated by a ventilation system independent of the engine ventilation system 5 (two cooling agent paths are denoted by 5θ with a dashed line).

The flywheel is independently ventilated by two fans 17 and 18 integrated into the flywheel, the fan 17 being placed in the friction zone with the friction ring 12 on the disk 11.

According to the first embodiment of the invention, the complex of electromagnetic friction clutches consists of a single ferromagnetic disk 11, with a clutch independently driven by an electromagnet 7, and during braking by an electromagnet 9. A disk

11 having a ring on one side

12, and on the other hand, a ring 13 made of friction material, slides axially along the longitudinal grooves of the drive axis 14, and in the rest position is driven by means of release springs 19 and 20 and two rows of washers 21-24.

Electromagnets of clutch and braking, springs and washers together constitute an electromechanical device for clutch and braking of the disc.

According to the second embodiment of the invention (FIG. 3), an electromechanical device for coupling and braking a disk consists of a spring 20 with two washers 23 and 24 and a coupling electromagnet 7 of the appropriate size.

The clutch electromagnet 7 is powered by residual voltage to ensure the rest position of the disc 1 1.

For braking, the electromagnet 7 is switched off, the braking force is provided by the spring 20 of the appropriate size, which drives the disk by the friction ring 13 to the shield 10 ,.

I ·

To effect coupling, the voltage applied to the electromagnet 7 rises above the residual voltage. As much as the ratio between applied and residual stresses, so much less adhesion.

In all three examples, independent ventilation of the system is carried out by suction of cooling air by the fan 17 through the holes of the shield 10 near the electromagnet 9 through the slots of the disk 11 and the air being expelled near the electromagnet 7. The holes absorbed by the fan 18 near the drive axle 18 are forced out

I

According to a third embodiment of the invention (FIG. 4), an electromechanical device for coupling, braking and braking a disk consists of a spring 19 with washers 21 and 23 and an electromagnet 9 of braking.

five

1487131

6

The braking electromagnet is powered by residual voltage to ensure the rest position of the disk 11,

To implement the clutch, the voltage applied to the electromagnet 9 decreases below the residual voltage, thus carrying out the clutch with the flywheel 6. The clutch force is provided by the spring 19.

Depending on the magnitude of the applied voltage on the output axis

14. A certain value of the rotational speed is obtained, in which, in the case of complete voltage disappearance, a rotational speed is obtained equal to the rotational speed of the axis 16 of the induction motor 5.

Braking is performed due to the applied voltage, the value of which exceeds the value of the residual voltage.

As much as the ratio of the applied voltage to the residual, the deceleration time is less.

The advantages of this invention are that as a drive element an asynchronous motor of current production is used, which is cheaper and more reliable than any type of electric motor; fast dynamic modes are provided; the system does not require adjustments during operation.

Claims (3)

Claim 1. Electromechanical drive system with variable speed, containing a self-venting flywheel with a fan on one ten 25 thirty 35 40 an end face in the friction zone, mounted on the axis of an asynchronous motor of mass production, a ferromagnetic disc with ventilation slots, mounted with a slide on the drive axis of the working machine, on one side of the disc one ring of friction material is fixed to sense the rotational motion of the flywheel, and on the other side of the disc a second ring of friction material for braking, and an electromechanical device for coupling and braking a disc in the form of an electromagnet, springs and washers, characterized in that, in order to simplify For instructions and improve rate control performance, · electromechanical coupling and braking device is composed of a disk mounted with the ends of the various spring disc washers and two electromagnet clutch or spring washers and with two braking electromagnet. 2. The system according to claim. ^, Characterized in that the electromechanical device for coupling and braking the disk is made in the form of two release springs, two rows of washers, a clutch electromagnet and a braking electromagnet located at both ends of the disc, while the electromagnets are intended for alternate power supply, respectively, of direct coupling and braking. 3. System by π. 1, characterized in that the flywheel is equipped with a second fan located in the friction zone of the flywheel with the friction ring of the ferromagnetic disk. 1487131 (pu5.2 1487131 // / 2 23 20 24 4