RU2284628C2 - Power circuit for reluctance inductor motor phase winding - Google Patents

Abstract

FIELD: electrical engineering; variable-speed drive systems using reluctance inductor motors.

SUBSTANCE: proposed power circuit for phase winding of reluctance inductor motor has power supply, motor phase winding, electronic switch, capacitor, and diode, as well as choke coil connected directly to positive lead of power supply and through series-interconnected electronic switch, diode, and phase winding, to negative lead. Capacitor is connected to common point of connection of electronic switch to diode anode and power supply negative lead.

EFFECT: reduced number of phase winding leads, extended range of motor speed control.

1 cl, 3 dwg

Description

The invention relates to electrical engineering and can be used in controlled electric drive systems with reactive induction motors (RID).

There is a known RID power supply circuit, the phase winding of which is divided into two bifilar wound parts [TJE Miller Switched Reluctance Motors and Their Control. Magna physics publishing and Clarengon press. Oxford 1993. Page 205, on p.88, figure 6.4 d]. The first part of the winding is connected to the power source through a controlled key, and the second through a diode. The disadvantage of the circuit is the presence of additional conclusions of the phase winding, which complicates the design of the motor.

Closest to the proposed technical solution is a circuit containing a constant or ripple voltage source, to the terminals of which a phase winding of an electric motor is connected, divided into two parts connected to each other through a capacitor, one part of the winding through a series-connected diode is connected to a power source, and the second part windings through a series-connected semiconductor switch are connected to the same source [RF Patent No. 2119227, IPC 6 N 02 K 29/06, N 02 P].

The disadvantage of the circuit is the presence of additional conclusions of the phase winding, which complicates the design of the motor. In addition, parts of the phase winding are in unequal supply conditions: the energy supplied to one part of the winding is dosed by the key, and the other part of the winding, when the key is closed, is included in the circuit with resonant properties, and when the switching frequency of the key deviates from the resonant, the energy in the circuit decreases, which leads to a deterioration of the engine parameters. Therefore, the scheme is applied when the range of regulation of the engine speed is small.

The objective of the invention is to reduce the number of conclusions of the phase winding and the expansion of the range of regulation of the frequency of rotation of the motor.

The problem is achieved in that the power circuit of the phase winding of the jet induction motor, containing the power source, the phase winding of the motor, an electronic switch, a capacitor and a diode is additionally equipped with a choke, which is connected directly to the positive terminal of the power source and to the negative terminal through an electronic switch connected in series , diode and phase winding, and the capacitor is connected to the junction point of the electronic key with the anode of the diode and the negative output of the power source.

The positive effect of the invention is manifested in the fact that the number of terminals of the phase winding is reduced and the range of regulation of the engine speed is expanded.

Figure 1 shows the power circuit of the phase winding RID. Figure 2 shows the waveforms of the current I (t) in the motor winding and voltage U (t) on the capacitor.

The circuit contains a power source 1, a choke 2, connected directly to the positive terminal of the power source, and to the negative via a series-connected electronic switch 3, diode 4, phase winding 5, and a capacitor 6 connected to the junction point of the electronic switch 3 with the anode of diode 4 and negative power supply clamp.

The scheme works as follows. When the key 3 is closed, the capacitor 6 is charged from the power source 1 through the current limiting inductor 2 and the key 3. The voltage of the charged capacitor is applied to the phase winding 5 through the diode 4, which leads to an increase in the current in the winding 5. The waveforms of the current I (t) in the winding 5 and the voltage U (t) on the capacitor 6 is shown in Fig.2. At the moment when the capacitor is charged to a predetermined voltage, the key 3 opens and in the circuit formed by the capacitor 6, diode 4, and the motor winding 5, an oscillatory process occurs during which a unipolar current pulse is generated in the winding 5, and the capacitor 6 is recharged, changing polarity voltage on the plates. (see figure 2, a) In this state, the circuit will remain until the key 3 is re-closed, since the diode 4 prevents the reverse charge of the capacitor 6. The maximum engine speed is determined by the natural frequency of the circuit consisting of a capacitor 6 and the motor winding 5 . When reducing the speed from the maximum value to zero, the amplitude of the current in the winding is maintained by closing the key 3 to recharge the capacitor 4. The process of generating current in the winding 5 by recharging the capacitor with decreasing h The rotation frequency is shown in FIG. 2, b.

Thus, the power supply of the RID phase winding allows you to adjust the engine speed from zero to the maximum value determined by the circuit parameters, without degrading the motor parameters.

Claims (1)

The power circuit of the phase winding of a jet induction motor, comprising a power source, a phase winding of the motor, an electronic switch, a capacitor and a diode, characterized in that the circuit is additionally equipped with a choke connected directly to the positive terminal of the power source and to the negative terminal through an electronic switch connected in series, the diode and the phase winding, and the capacitor is connected to the junction point of the electronic key with the anode of the diode and the negative terminal of the power source.

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