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Electric 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: 2019-01-15
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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  • Electric motor heating method, device and frequency converter
  • Electric motor heating method, device and frequency converter
  • Electric motor heating method, device and frequency converter

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Embodiment Construction

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0036] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude one or Presence or addition of multiple other features, integers, steps, operations, elements, components and / or collections thereof.

[0037] see figure 1 and figure 2 , figure 1 It is a schematic flowchart of a...

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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, in particular to a motor heating method, device and frequency converter. Background technique [0002] In the air-conditioning system of automobiles and other equipment, when the ambient temperature is minus 30-40°C, the lubricating oil of the compressor will solidify, and the cooling medium will become liquid. Started 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 lubricating oil of the compressor, and then start the air conditioning system. [0003] At present, the method of heating the motor is mainly to inject a direct 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 copper loss and iron loss of the stator winding of the motor only account for a small part of the motor power, the heating po...

Claims

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Application Information

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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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