SU1472853A1 - Rig for testing electric motors - Google Patents

Abstract

The invention relates to a measurement technique and can be used for testing electric motors. The purpose of the invention is to increase labor productivity and measurement accuracy. The stand uses a rotary cassette 10 with guide plates 11, on which a current collector 12 is installed to supply power to the terminals of the electric motor and the radiator 13 with a receiver 14 of infrared rays to determine the frequency of rotation of the electric motor core. The brake device is made in the form of a rotary friction brake meter, at one end of the shaft of which a calibrated brake disk 6 is fixedly attached to which motor shaft 1 touches the cassette during rotation of the cassette during the measurement of the braking torque, and at the other end of shaft 1 the drum scale 2 is fixed to a calibrated load . Friction-pulse electromagnetic damper 5 with pulsed impacts on the drum scale reduces relaxation oscillations and brake-torque meter jumps. 2 Il.

Description

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rotation of the motor core. The brake device is made in the form of a rotary friction-moment-brake brake, on one end of the shaft of which the brake calibrated disc 6 is fixedly attached to which the shaft 1 of the electric motor comes in contact with turning the cassette during measurement.

The invention relates to a measurement technique and can be used, for example, for testing electric motors of children's toys.

The purpose of the invention is to increase the operator's productivity and the accuracy of measurement of motor parameters.

FIG. 1 shows a stand, general view; in fig. 2 is a section A-A in FIG. one .

The stand consists of a rotary friction brake-torque meter, on one end of the shaft 1 of which a drum scale 2 is fixed with a fixed pointer 3 and with a calibrated replaceable load 4, and equipped with a friction-pulse electromagnetic damper 5, and a calibrated brake disk is fixed on the other end of the shaft 6, with which the shaft 7 of the electric motor 8 contacts the cassette 10 on its axis 9, with the guide plates 11 on which the current collector 12 and the emitter 13 are mounted with the infrared ray receiver 14, and also has an electron nym unit 15.

The stand works as follows.

In the initial position, the fixed pointer 3 is against the zero mark of the scale 2.

The motor 8 under test (Fig. 1) is inserted along the guide plates 11 into the cassette 10 and connected to the current collector 12 with its contacts. At the same time the measles of the electric motor begin to rotate and their poles} -. Between which there are gaps of the radiator 13. Rays pass

braking torque, and at the other end of the shaft 1, the drum scale 2 is fixed with a calibrated load. Friction-pulsed electromagnetic damper 5 pulsed strikes on the drum scale reduces relaxation oscillations and jumps of the torque-meter brake. 2 Il.

2 through the transparent walls of the motor case for the infrared range, are modulated by the poles of the core and enter the receiver 14, after which they are converted by an electronic tachometer located in block 15 into an electrical signal suitable for observation by the operator. In addition, the voltage at the terminals of the motor and the current consumed by the core are measured. In this position, the motor is tested at idle, i.e. without brake load on the shaft.

5 For test motor under

The load of the rotary cassette 10 (Fig. 2) with the electric motor 8 is rotated around the axis 9 until the rotating shaft 7 of the tested electric motor 8 is in contact with the brake disc 6 calibrated in diameter.

The rotating shaft 7 of the electric motor 8 is braked by the disk 6, creating a braking torque on the shaft of the electric motor. At the point of tangency, an equal and opposite torque of the torque of rotation occurs, which rotates the system: disk 6; shaft 1; scale 2 with a load of 4, at an angle proportional to the torque. The magnitude of the braking torque (brake load) depends on the magnitude of the force of the shaft 7 against the disk 6 and is determined on a scale of 2. The range of the measured (set) braking torque is changed by replacing the calibrated load 4. The friction-pulse electromagnetic damper 5 eliminates relaxation oscillations systems: disk 6, shaft I, scale 2 with a load of D.

If necessary, the measured parameters can be used to calculate the efficiency of an electric motor or to construct a loading characteristic of an electric motor.

The use of a rotary cassette with guide plates, on which a current collector and an emitter with an infrared ray receiver are installed, allows an operator to increase his productivity by reducing the time for preparatory operations for installing and connecting the electric motor to the stand.

The use of a rotary friction brake-torque meter, on one end of the shaft of which the brake disk is fixedly mounted and on the other - a drum scale with a load, improves the accuracy of measurement of the braking torque and makes it possible to test electric motors without attaching the nozzle to the shaft and does not require precise axial joining of the shaft electric motor with a loader.

The use of a pulse friction electromagnetic damper reduces the time and improves the accuracy of the measurement of the braking torque.

Claims (1)

Invention Formula A test bench for electric motors, comprising a housing with a seat for the motor under test, a braking device in the form of a rotary friction brake-torque meter, at one end of the shaft of which a drum with a scale and calibrated load is fixed, a motor connection unit and a motor parameter control unit differing in that, in order to improve performance and measurement accuracy, it is equipped with a calibrated brake disc mounted on the other end of the brake shaft as The housing of the body uses a rotary cassette with guide plates on which the motor connection unit is installed; the cassette is installed so that it can be rotated to the mechanical contact of the shaft of the motor under test with a brake disc, and a friction-pulse electromagnetic damper is placed above the brake drum. Aa eight //