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Frequency conversion control device of DC motor

A DC motor and frequency conversion control technology, which is applied in the direction of electronic commutation motor control, single motor speed/torque control, control system, etc., can solve problems such as application range obstacles, and achieve the effect of reducing computing workload and accurate control

Active Publication Date: 2011-06-22
HAIER GRP CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the above method of using zero-crossing detection to judge the position of the rotor can only be used in the 120-degree frequency conversion mode, and its application range is greatly hindered

Method used

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  • Frequency conversion control device of DC motor
  • Frequency conversion control device of DC motor
  • Frequency conversion control device of DC motor

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Embodiment Construction

[0038] An embodiment of the present invention provides a variable frequency control device for a brushless DC motor. The detection of the rotor position by this device does not require the motor to have a non-conducting phase, thereby meeting the need for 180-degree sine wave frequency conversion of the brushless DC motor.

[0039] In order to enable those skilled in the art to better understand the solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0040] see figure 1 , which is a schematic circuit diagram of the first embodiment of the present invention.

[0041] The circuit of the first embodiment of the present invention includes an intelligent frequency conversion module 1, a controller 2, a brushless DC motor 3, and sampling resistors R1, R2, and R3.

[0042] The intelligent frequency conversion module 1 mainly includes an inverter composed of six high-power e...

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Abstract

The invention discloses a DC electromotor frequency conversion control device which is characterized in that the device comprises a sample resistance, an intelligent frequency conversion module and a controller which are connected in series among three low bridge arms and power DC buses of the intelligent frequency conversion module. The intelligent frequency conversion module comprises an inverter consisting of a large power electric switch apparatus; the switch control gate of the large power electric switch apparatus receives a switching control signal transmitted by the controller, and the switching control signal is converted to a drive current of the DC electromotor by the controller; the controller comprises a calculating element which is used for calculating and obtaining the position of a rotor according to the three-phase input current of the electromotor collected by the sample resistance as well as a control unit which generates the switching control signal of the large power electric switch apparatus according to the rotor position and an expected rotate speed of the electromotor. The DC electromotor frequency conversion control device provided by the invention can meet the requirement of the frequency conversion of 180 degrees of sine wave of a brushless DC electromotor.

Description

technical field [0001] The invention relates to the field of direct current frequency conversion motors, in particular to a frequency conversion control device for brushless direct current motors. Background technique [0002] In the motor drive technology, the common squirrel-cage AC motor has been widely used due to its simple structure. However, the control performance of this motor is poor, and it is difficult to obtain the required speed and torque. For example, the compressors of air conditioners and refrigerators driven by ordinary squirrel-cage alternating current cannot control the speed and torque of the motor, so the cooling capacity of the compressors is the same when they are working, and the cooling of the compressors cannot be adjusted according to the needs. Therefore, this kind of compressor adopts the method of motor interval work to obtain a suitable control temperature. The motor stops and starts repeatedly, causing problems such as large power consumpt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/18H02P6/06H02P6/08H02P6/182
Inventor 程永甫林凡卿刘俊杰
Owner HAIER GRP CORP
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