Connecting a three-phase asynchronous electric motor to a single-phase network through a capacitor. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Connecting a three-phase asynchronous electric motor to a single-phase network through a capacitor. Encyclopedia of radio electronics and electrical engineering

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Winding connection diagram - triangle

If it is required to connect a three-phase asynchronous electric motor with a triangle winding connection scheme to a single-phase network, the installation is carried out according to the scheme described below

Rice. 1. Connecting a three-phase asynchronous motor

Scheme of inclusion in a single-phase network of a three-phase asynchronous motor with stator windings connected in a triangle: С1 - a capacitor for the operation of the electric motor; C2 - a capacitor to start the motor; SA1 - capacitor switch C2; SA2 - switch of the direction of rotation of the electric motor, reverse; BP - asynchronous electric motor, with a squirrel-cage rotor.

The capacity of the working capacitor C1, for a three-phase electric motor with a triangle connection of the windings, is determined by the formula С1 = 4800*(I/U) (uF)

4800 - coefficient depending on the connection of the windings;

I - rated current of the electric motor, A;

U - voltage of a single-phase network, V

Start Capacitor С2 = (2-3)*С1.

The rated voltage of the capacitors must be 1,5 times higher than the mains voltage; capacitors must be used metal-paper (MBM, MBGO, MBGCH).

Winding connection diagram - star

Sometimes it is required to connect a three-phase asynchronous electric motor with a star winding connection scheme to a single-phase network, this can be done according to the diagram below

Rice. 2. Connecting a three-phase asynchronous motor

Scheme of inclusion in a single-phase network of a three-phase asynchronous motor with stator windings connected in a star: С1 - a capacitor for the operation of the electric motor; C2 - a capacitor to start the motor; SA1 - capacitor switch C2; SA2 - switch of the direction of rotation of the electric motor, reverse; BP - asynchronous electric motor, with a squirrel-cage rotor.

The capacity of the working capacitor C1, for a three-phase electric motor with a star connection of the windings, is determined by the formula С1 = 2800*(I/U) (uF)

2800 - coefficient depending on the connection of the windings;

I - rated current of the electric motor, A;

U - voltage of a single-phase network, V

Start Capacitor С2 = (2-3)*С1.

The rated voltage of the capacitors must be 1,5 times higher than the mains voltage; capacitors must be used metal-paper (MBM, MBGO, MBGCH).

Publication: electro.narod.ru

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