Motor heating method, device and frequency converter

A heating method and inverter technology, applied in motor control, AC motor control, electrical components, etc., can solve the problems of low heating power and slow heating speed.

Active Publication Date: 2020-10-20
SHENZHEN INVT ELECTRIC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the copper loss and iron loss of the stator winding of the motor only account for a small part of the motor power, the heating power is very small and the heating speed is very slow

Method used

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  • Motor heating method, device and frequency converter
  • Motor heating method, device and frequency converter
  • Motor heating method, device and frequency converter

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Embodiment Construction

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0036] It is to be understood that, when used in this specification and the appended claims, the terms "comprising" and "comprising" indicate the presence of the described features, integers, steps, operations, elements and / or components, but do not exclude one or The presence or addition of a number of other features, integers, steps, operations, elements, components, and / or sets thereof.

[0037] see figure 1 and figure 2 , figur...

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Abstract

An embodiment of the present application discloses a heating method, a device and a frequency converter of an electric motor. The method comprises the following steps of: acquiring a high-frequency alternating current output from an inverter to a motor; Based on the preset calculation formula, the actual heating power and the corresponding actual current amplitude are calculated according to the high frequency alternating current. Obtaining a given heating power and performing an adjustment limiting process on the given heating power and the actual heating power to obtain an injection currentfrequency; Integrating the injected current frequency to obtain a voltage vector angle; Obtaining a given current magnitude and performing an adjustment limiting process on the given current magnitudeand the actual current magnitude to obtain an adjustment voltage magnitude; Inputting a voltage vector angle and a regulated voltage amplitude to a preset pulse width modulator to generate a pulse width modulated signal; The inverter is controlled to output high frequency AC current to the motor according to the pulse width modulation signal to heat the motor. The method in this embodiment can improve the heating speed of the motor and realize the adjustable heating power.

Description

technical field [0001] The present application relates to the technical field of motor control, and in particular, to a heating method, device and frequency converter for a motor. Background technique [0002] When the ambient temperature of the air-conditioning system in automobiles and other equipment is minus 30 to 40 °C, the compressor lubricant will solidify and the cooling medium will become liquid. If the air-conditioning system is suddenly started at this time, the motor will be heavily loaded, and the motor will not be able to Launched smoothly. In order to enable the motor to start smoothly, it is generally necessary to heat the motor first to vaporize the cooling medium, thaw the compressor lubricating oil, and then start the air conditioning system. [0003] At present, the method of heating a motor is mainly to inject a DC current into the motor, and use the copper loss and iron loss of the stator winding of the motor to heat the motor. However, since the copp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P29/62H02P27/048
CPCH02P27/048H02P29/62
Inventor 沈文刘军锋郑丽丽
Owner SHENZHEN INVT ELECTRIC
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