SU1410221A1 - Electric machine-type frequency converter - Google Patents

Abstract

The invention relates to electrical engineering, primarily to electrical machines, and can be used to convert a voltage of an initial frequency into a voltage that requires a frequency. The aim of the invention is to reduce the consumption of active materials and simplify the design. On the stator of the motor, the sixteen-pole winding is placed in the same grooves, except for the bipolar winding, and the closed-loop rotor is made with seven open slots without a bevel. This allows the sixteen-pole winding to produce an 8-fold increase in frequency due to the rotor tooth harmonics. The engine and the generator at the same time combined and performed on a single package of the magnetic circuit. 2 Il. "

Description

The invention relates to electrical engineering, in particular to electric frequency inverters with combined windings.

The purpose of the invention is to simplify the design, reducing the consumption of active and structural materials.

Fig, 1 shows a diagram of the stator winding; in fig. 2 - scanning of the denzal zone of the stator and rotor cores.

The electromagnetic transducer contains a stator core 1 and a motor winding 2.

The motor and generator windings are electrically unconnected and embedded in the same grooves. At the same time, the number of poles of the generator winding is an even number of times greater than the number of poles of the motor winding. An increase in the number of poles of the generator winding is exactly an even number of times necessary to exclude the transformer – emf of the main frequency in the generator winding due to the fact that the harmonics of the windings, the pole of which is different, do not induce EMF of mutual induction even times. The latter is due to the fact that the winding coefficient of any winding with respect to an even harmonic of the order of 2pR relative to its main harmonic of the order of P is zero.

The number of grooves on the rotor is Z (k-1) P, where k. Is the coefficient of the frequency transformation, even number. . With such a number of grooves, a tine harmonic of the order of Zj + P will create a wave: well, an induction of the order of kP 2пР equal to the order of the main harmonic of the generator winding and not creating an emf in the motor winding.

In this case, it is usually harmful: a perturbed harmonic field is used as a source of generating emf.

To increase the amplitude of the tine-wave induction harmonics and to increase the emf of the generator winding, the rotor slots are open.

When the motor winding is connected to the network, the converter starts up and its rotor, after acceleration, turns

shifts at a constant speed. In addition to this, in addition to harmonics, the field of the motor winding creates a tine harmonics of the floor. At the output of the generator winding at a fixed load, a sinusoidal voltage is created, although the conductor EMF consists of three harmonics.

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The winding coefficients of the generator winding for the harmonics of the Z – P order are zero, therefore, the EMF will be induced only by a harmonic of the order of the Z + P.

The jagged harmonic of the induction order Z. + P, rotating relative to the generator winding, induces in it an emf of a frequency equal to

, f f, (| 4l-S) + 1),.

where f is the frequency of the generator EMF; fg - network frequency; S - slip; Zj the number of slots of the rotor. In general, this converter can be used to convert the frequency to any even number paz,

Formula I.3 gain

A variable frequency drive containing a stator core with slots in which motor and generator windings are laid, a rotor core with slots, characterized in that, in order to reduce the consumption of active materials and simplify the design, the rotor is made with open slots, and the number of slots is less than pairs of generator winding sub-pairs for the number of motor pole winding pairs.

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Claims (1)

Formula of the invention An electric machine frequency converter containing a stator core with grooves in which the motor and generator windings are stacked, a rotor core with grooves, characterized in that, in order to reduce the consumption of active materials and simplify the design, the rotor is made with open grooves, and its number the grooves are less than the number of pairs of poles of the generator winding by the number of pairs of poles of the motor winding.