Busbar voltage control method for brushless direct current motor-driven frequency converter

A busbar voltage control, brushed DC motor technology, applied in electrical components, output power conversion devices, etc., can solve problems such as unfavorable inverter heat dissipation, reduced system energy consumption, increased heat loss of power devices, etc., to ensure normal operation. and heat dissipation, reliability assurance, and the effect of avoiding waste

Active Publication Date: 2017-01-25
HANGZHOU XIANTU ELECTRONICS
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, when the motor is used under low-load conditions, it only needs a lower voltage to work normally, which not only causes a waste of the voltage, but also increases the heat loss of the power device, which is not conducive to the heat dissipation of the inverter and causes The problem of temperature rise is not conducive to the reduction of system energy consumption

Method used

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  • Busbar voltage control method for brushless direct current motor-driven frequency converter
  • Busbar voltage control method for brushless direct current motor-driven frequency converter
  • Busbar voltage control method for brushless direct current motor-driven frequency converter

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] Such as figure 1 , figure 2 As shown, the present invention is a bus voltage control method for brushless DC motor drive frequency converter, comprising the following steps,

[0025] (1) Turn on PFC;

[0026] (2), setting the target voltage saturation rate Ratio_target and reading the actual bus voltage value Ed, in the present embodiment, the target voltage saturation rate is generally set to about 90%; the relationship between the bus voltage and the motor drive phase voltage is as attached image 3 shown.

[0027] (3) Calculate the actual voltage saturation rate Ratio_v_e;

[0028] (4), calculate the target bus voltage value Ed_target;

[0029] (5), adjust PFC;

[0030] (6) Change the actual bus voltage value Ed to approach the target bus voltage value Ed_target; that is, change the actual bus voltage value Ed so that the actua...

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Abstract

The invention discloses a busbar voltage control method for a brushless direct current motor-driven frequency converter. The method comprises the following steps: turning on a PFC; setting a target voltage saturation rate Ratio-target and reading an actual busbar voltage value Ed; calculating to obtain an actual voltage saturation rate Ratio-v-e; calculating to obtain a target busbar voltage value Ed-target; adjusting the PFC; changing the actual busbar voltage value Ed so as to enable the actual busbar voltage value Ed to approach the target busbar voltage value Ed-target. The busbar voltage control method can be used to adjust voltage in real time according to a load of a motor.

Description

technical field [0001] The invention relates to the technical field of brushless DC motor driven frequency converter control technology, in particular to a bus voltage control method for brushless DC motor driven frequency converter. Background technique [0002] In the sinusoidal drive of the brushless DC motor (hereinafter referred to as the motor), the PFC technology is generally used to increase the bus voltage of the motor (hereinafter referred to as the voltage). Under normal circumstances, the PFC is turned on first, and then as the motor speed increases or the load increases, the motor power gradually increases, and the phase voltage also increases accordingly. When the phase voltage increases to exceed the power supply voltage, the voltage saturation state is reached, that is, the voltage remains constant no matter how the load frequency changes. When the motor is working under high load, the voltage is effectively utilized, and the utilization rate of the voltage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32
CPCH02M1/32
Inventor 不公告发明人
Owner HANGZHOU XIANTU ELECTRONICS
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