Alternating-current and direct-current dual-purpose motor control system

Abstract

The invention discloses an alternating current and direct current dual-purpose motor control system. The system comprises a direct-current power supply, an inverter, a rectifier, a low-pass filter, afirst relay and a power device. The direct-current power supply is electrically connected with the inverter, the inverter is electrically connected with the rectifier, and the rectifier is electrically connected with the low-pass filter; the low-pass filter is electrically connected with the power device through a first relay, and the direct current in the direct current power supply is outputtedto the inverter, is inverted into an alternating current through the inverter and is outputted to the rectifier. The alternating current is converted into the direct current through the rectifier andis higher than the voltage of the DC outputted by the power supply at begin, and the current is continuously transmitted to the low-pass filter, so that the alternating-current and direct-current dual-purpose motor is wide in application range, is suitable for high-voltage and low-voltage electric appliances, guarantees the continuous and stable operation of the circuit without needing to turn onor turn off the power supply strenuously and repeatedly, and is high in practicability.

Description

technical field [0001] The invention relates to the technical field of motor control systems, and the specific field is an AC and DC dual-purpose motor control system. Background technique [0002] The control circuit in the high-voltage power supply and distribution system generally has several different power systems: DC220V, DC110V, AC220V, and AC110V. In order to promote the high-voltage switch action to realize the opening and closing of the high-voltage switch, the AC-DC dual-purpose motor is essentially a series-excited DC motor, which connects the excitation (stator) winding and armature (rotor) winding of the DC motor in series in- So that the rotation direction of the motor is only related to the order of the terminals with the same name connected to the two windings, and has nothing to do with the positive or negative of the power supply voltage. Therefore, this kind of motor can be operated by AC power supply or DC power supply. At the same time, this This kind ...

AI Technical Summary

Problems solved by technology

[0002] The control circuit in the high-voltage power supply and distribution system generally has several different power systems: DC220V, DC110V, AC220V, and AC110V. In order to promote the high-voltage switch action to realize the opening and closing of the high-voltage switch, the AC-DC dual-purpose motor is essentially a series-excited DC motor, which connects the excitation (stator) winding and armature (rotor) winding of the DC motor in series in- So that the rotation direction of the motor is only related to the order of the terminals with the same name connected to the two windings, and has nothing to do with the positive or negative of the power supply voltage. Therefore, this kind of motor can be operated by AC power supply or DC power supply. At the same time, this This kind of motor also has the advantage of being suitable for heavy-duty starting. The existing AC-DC motor control system is only suitable for power equipment working with low voltage, and cannot be suitable for power equipment working at high voltage at the same time, and its practicability is poor.

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