Switched reluctance motor speed adjusting device

Abstract

The invention relates to a switched reluctance motor speed adjusting device which comprises a feedback unit, an inverting unit, a feedback reactor component, a first contactor, a second contactor, a first transformer, a second transformer, a braking resistance unit and a switching control circuit. A feedback unit power circuit is connected with a power grid through the feedback reactor component and the first contactor in sequence. A control circuit of the feedback unit is connected with the power grid through the switching control circuit and the first transformer in sequence. The braking resistance unit is connected with the front end of the feedback reactor component through the second contactor. A control power supply of the feedback unit and a control power supply of an inverting unit are connected to the front end of the feedback reactor component through the second transformer respectively. The switching control circuit is connected with the control power supply of the feedback unit, the control circuits of the feedback unit and the inverting unit and coils of the first contactor and the second contactor. The system structure is simplified, and the problem of power supplying of a control power supply and other electric equipment in a system under the situation of sudden power losing of the power grid is solved.

Description

technical field [0001] The invention relates to a switched reluctance motor speed control device, in particular to a switched reluctance motor speed control device capable of solving the problem of controlling a power supply and supplying power to other electrical equipment in the system when the power grid is suddenly cut off. Background technique [0002] The existing switched reluctance motor speed control device, through the combination of feedback reactor, feedback unit, inverter unit, and braking unit, drives the switched reluctance motor SRM to achieve four-quadrant operation, and can realize the power grid in the state of power failure. Brake to decelerate and stop. The structure of the speed control device is as follows figure 1 As shown, the power circuits of each unit are connected through the positive and negative bus bars, and the filter capacitor C is connected across the positive and negative bus bars. The feedback unit is connected to the power grid through...

AI Technical Summary

Problems solved by technology

[0004] 1. In order to realize energy release after power failure, a braking unit is added on the basis of the four-quadrant system. The complexity reduces the reliability;

[0005] 2. Although the control power supply of the three units can be taken from the DC bus, AC power supply, or energy storage device, they all have limitations

[0006] 3. Since mining belts or lifting transportation systems are generally medium-voltage (660V~3300V) products, when the control power is taken from the DC bus, there are no ready-made products for medium-voltage DC / DC converters in the market, and custom development is required, and Device selection is difficult and reliability is low

[0007] 4. If the control power supply is taken from the AC power supply (different from the main circuit power supply), if all or part of the power grid is cut off, the control power supply may also be powered off, so that the function of braking and stopping at power failure cannot be realized; when the control power supply is taken from the energy storage There are generally two types of batteries and capacitors for installation. If energy storage devices such as batteries are used, a separate explosion-proof (intrinsically safe) structure is required to meet the national safety standards for mining. The technology is complex and difficult to implement; when using capacitor energy storage, Too many, limited space is difficult to achieve placement

Images