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

An asynchronous motor and three-phase AC technology, which is applied to the starter of a single multi-phase induction motor, motor generator/starter, etc., can solve the problems of complicated, inconvenient use, and high cost of starting equipment

Inactive Publication Date: 2007-05-23
沈进
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this method is very cumbersome to use, inconvenient to use, and the cost of starting the equipment is relatively high

Method used

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

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Embodiment Construction

[0009] The present invention is further explained as follows with reference to accompanying drawing in conjunction with specific embodiment:

[0010] A time-sharing starting method for a three-phase asynchronous motor, which is a starting method for controlling voltage. When the three-phase asynchronous motor starts, the time-sharing control three-phase power supply AC sine wave voltage is applied to the input end of the motor, see Figure 1, Take any two phases of the three-phase voltage of A, B, and C, for example, the instantaneous voltage difference ΔU between the two phases of A and B AB is zero time, in the figure t 0 time, connect the two-phase voltage U AB Applied to the corresponding A and B two-phase input terminals of the motor, at this time t 0 , the other phase voltage C does not turn on the motor, and after a delay of Δt until the instantaneous voltage value of the other phase C is zero, t in the figure 1 At this time, the C-phase voltage is turned on, and the ...

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PUM

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P1/26
Inventor 沈进
Owner 沈进
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