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Variable frequency motor power measuring method and device

A variable frequency motor and power measurement technology, which is applied to measuring devices, electric power measurement through current/voltage, motor generator testing, etc., can solve problems such as the inability to obtain real-time online power of variable frequency motors, and achieve efficient discovery and results.

Active Publication Date: 2016-06-15
INTELLIGENT GRINDOCTOR TECH SHENZHEN CO LTD
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Problems solved by technology

Traditional measurement methods cannot realize the acquisition of real-time online power of variable frequency motors

Method used

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  • Variable frequency motor power measuring method and device
  • Variable frequency motor power measuring method and device
  • Variable frequency motor power measuring method and device

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0025] In one embodiment, such as figure 1 As shown, a method for measuring the power of a variable frequency motor is provided, and the method includes the following steps 102-110.

[0026] Step 102, acquiring the first input voltage and the first input current of each phase of the variable frequency motor in operation.

[0027] In this embodiment, the variable-frequency motor includes a three-phase variable-frequency motor, which may be a variable-frequency motor applied in machine tools in modern manufacturing industries. For example, it can be a variable frequency motor used in compressors, w...

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Abstract

The invention relates to a variable frequency motor power measuring method. The method includes the steps of: determining a real part and an imaginary part of a fundamental wave vector and a real part and an imaginary part of a harmonic wave vector of a corresponding voltage of each phase according to a first input voltage of each phase; determining a real part and an imaginary part of a fundamental wave vector and a real part and an imaginary part of a harmonic wave vector of a corresponding current of each phase according to a first input current of each phase; determining corresponding first active power and first reactive power of each phase according to the real part and imaginary part of the fundamental wave vector and the real part and imaginary part of the harmonic wave vector of the voltage of each phase and the real part and imaginary part of the fundamental wave vector and the real part and imaginary part of the harmonic wave vector of the current of each phase; and determining the total active power and total reactive power of a variable frequency motor according to the first active power and the first reactive power of each phase. The method can realize measurement of real-time on-line power of the variable frequency motor. In addition, a variable frequency motor power measuring device is correspondingly provided.

Description

technical field [0001] The invention relates to the field of electronic equipment, in particular to a method and device for measuring the power of a variable frequency motor. Background technique [0002] A large number of machine tools are used in modern manufacturing, and one of the core components of machine tools is the motor. Motors include fixed-frequency motors and variable-frequency motors. Compared with fixed-frequency motors, the use of variable-frequency motors in machine tool equipment can achieve better energy-saving and emission-reduction effects, and can realize stepless speed regulation of machine tool spindles. The real-time power of the variable frequency motor can reflect the current working status of the machine tool. For example, the force on the tool and the workpiece of the machine tool during the operation can be known according to the real-time online power of the variable frequency motor, so that the problems existing in the processing can be discov...

Claims

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Application Information

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IPC IPC(8): G01R31/34G01R21/06G01L3/24
CPCG01L3/24G01R21/06G01R31/343
Inventor 王晋生
Owner INTELLIGENT GRINDOCTOR TECH SHENZHEN CO LTD
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