High-uniformity heating device for motor hot jacket

Abstract

The invention provides a high-uniformity heating device for a motor hot jacket. The high-uniformity heating device comprises an induction coil capable of matching an inner cavity of the motor hot jacket and an alternating current power supply module connected with the induction coil, and the induction coil is an n-turn hollow spiral copper coil; the whole induction coil is in a frustum shape, the n-turn hollow spiral copper coil is wound at equal intervals in the longitudinal direction, and the winding radiuses of the n-turn hollow spiral copper coil are linearly increased from top to bottom. According to the invention, high-uniformity heating of the motor hot jacket can be realized, and the device is suitable for occasions with high transient heating temperature and strict uniformity requirements.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic induction heating, and in particular relates to a high-uniformity heating device for a thermal sleeve of a motor. Background technique [0002] Due to the low density, light weight and high thermal conductivity of aluminum alloy, aluminum materials are often used as motor heat sleeve (motor housing) materials in the market. In the process of electromagnetic induction heating motor thermal sleeve, due to the large alternating current, the large current flows through the hollow spiral copper coil, which generates a large magnetic field around the coil, and the motor thermal sleeve located within the magnetic field is affected by the eddy current effect. Rapidly heat up. According to the principle of thermal expansion and cold contraction, this electromagnetic induction heating method is often used in the industry to heat the motor thermal sleeve, so that the surroundings of the motor therma...

AI Technical Summary

Problems solved by technology

This heating device has a good heating effect on the thermal sleeve of the motor with a small size, but when the size of the thermal sleeve of the motor is large, it is affected by the "skin effect" and "edge effect" of electromagnetic induction, resulting in uneven distribution of eddy currents. Even, it is difficult to achieve uniform heating of the motor heat sleeve

If the difference in the temperature rise rate of each surface of the motor heat sleeve is too large, local overheating will occur, resulting in inconsistent deformation around the motor heat sleeve, and ultimately the smooth assembly of the motor stator and the motor heat sleeve cannot be completed

Especially for the thermal sleeve of the motor with T-shaped process grooves with uneven thickness on the surface, the T-shaped process groove is the weak part of the magnetic field cutting, and it is very easy to cause over-temperature ablation at the groove, resulting in damage to the motor shell. Damage and failure of the heating process

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