Time-sharing starting method of three-phase AC asynchronous motor

An asynchronous motor, three-phase AC technology, applied to the starter, motor generator/starter, etc. of a single polyphase induction motor, can solve the problems of complicated, high cost of starting equipment, inconvenient to use, etc.
CN1599229AInactive Publication Date: 2005-03-23沈进
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
沈进
Publication Date
2005-03-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

A three-phase AC asynchronous motor time-sharing start-up method is a start-up method of controlling the voltage. When the three-phase asynchronous motor starts, we control the alternating current sine voltage of the three-phase power supply time-sharingly and input it into the carry-in terminal of the motor. When the instantaneous voltage difference of any two phases in the three phases, A, B and C, is zero, we turn on the two phases' voltage and impose them on the two corresponding carry-in terminal of the motor. We don't turn on the other phase's voltage until its instantaneous voltage is zero after a short time. The invention decreases the start-up current greatly on the foundation of guaranteeing that the three-phase asynchronous motor has enough start-up torsion.
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Description

Technical field:

[0001] The invention relates to a starting method for a three-phase AC asynchronous motor, in particular to a time-sharing starting method for a three-phase AC asynchronous motor. Background technique:

[0002] Three-phase AC asynchronous motors are widely used because of their simple structure, low price and adaptability to various working environments. At present, the starting methods of three-phase AC asynchronous motors include direct starting, Y-Δ starting, self-coupling step-down starting and soft starting. Direct start, Y-Δ start and self-coupling step-down start belong to the traditional starting methods. These starting methods may have the disadvantages of large starting current or reduced starting torque, making it difficult to start. For example, when starting directly, the starting current is usually the rated current 5-8 times of that, such a huge starting current will bring a great impact to the power supply grid, the motor and the transmissio...

Claims

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