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Brushless type motor and rotor for a motor

A brushless, rotor technology, applied in electromechanical devices, electrical components, electric components, etc., can solve the problems of compressor reliability, low rotor inertia, reduced inertia, etc.

Inactive Publication Date: 2018-02-16
HUANGSHI DONGBEI ELECTRICAL APPLIANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the total area used for fixing may not be sufficient to ensure rotor support and may cause reliability problems of the compressor
Yet another disadvantage of this approach is the reduced inertia of the components
Due to the fact that most of the section steel construction is close to the shaft, the rotor inertia is very low and can lead to undesired effects both at compressor start-up and under high load conditions

Method used

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  • Brushless type motor and rotor for a motor
  • Brushless type motor and rotor for a motor
  • Brushless type motor and rotor for a motor

Examples

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Embodiment Construction

[0036] like figure 1 Shown is a cross-sectional view of a portion of the mechanical assembly and motor, illustrating an example of the concept most widely used in hermetic compressor applications today. In this figure, the assembly consists of a stator 1 with a limit 1.1. The stator 1 is fixed at its upper part to the crankcase 4 and at its lower part by suspension springs 7 . The rotor consists of a laminated electrical steel core 2 and magnets 3 usually made of ferrite. The rotor core 2 is fixed to a shaft 5 , interfacing with the crankcase 4 through radial bearings 6 . The normal height of the assembly is indicated here with the letter A.

[0037] exist figure 2 , the same mechanical assembly and motor can be seen, but in this example the radial bearing 6 has been reduced, allowing the rotor 2 and stator 1 to be moved upwards in order to reduce the overall height of the assembly, now denoted by the letter B. Although this actually reduces the height of the compressor,...

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Abstract

The present invention relates to a brushless type motor and to rotor (2) for brushless type motor with surface magnets (3). The rotor having an axial extension (8) in which is inserted the shaft having the axial extension (8) a height greater than that of the stator (1) package, and the axial extension (8) also characterized by having a radial extension (9) into the lower base of the magnets (3),the radial extension (9) having an external radius greater than or equal to the radius of the axial extension (8), but less than or equal to the external radius of the magnets (3). The axial (8) and radial (9) extensions being used for fixing the shaft, increasing the moment of inertia, increasing the magnetic flux generated by the magnets (3) and also serving as a base for the assembly of the magnets.

Description

technical field [0001] The invention relates to a motor with a rotor designed for a brushless motor used in a variable capacity hermetic compressor for refrigeration. Other types of electric machines, such as for example reluctance machines or any other electric machines that do not require a rotor cage, can benefit from the invention. Background technique [0002] Variable capacity hermetic compressors typically use a mechanically linked rod and piston type system connected to a shaft by an eccentric pin. To move such mechanisms, brushless motors are commonly used, usually consisting of a stator and a rotor, the latter consisting of a laminated electrical steel core with surface magnets (although rotors with internally inserted magnets may also be found Version). The stator is usually screwed to the crankcase and also to the suspension springs. On the other hand, during assembly, the rotor is fixed to the eccentric shaft by mechanical interference. [0003] Brushless mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/27H02K1/02
CPCH02K1/02H02K1/2706H02K1/278H02K1/2796H02K1/28H02K7/02H02K7/14H02K2213/03Y02E60/16H02K1/2766H02K7/088H02K29/08
Inventor M·G·施瓦茨F·J·H·卡鲁夫
Owner HUANGSHI DONGBEI ELECTRICAL APPLIANCE
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