JPS587817Y2 - Servo motor cooling system - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rotating electrical machine with a heat pipe, which has a compact structure, has good cooling efficiency, and does not impair the reliability of the motor due to dirt, moisture, etc., and can be used regardless of whether the rotor is rotating or not. The purpose of the present invention is to provide a rotating electric machine with a heat pipe that can exhibit a sufficient cooling effect, and that allows the direction of ventilation by the fan to be freely selected regardless of the rotational direction of the motor, thereby preventing adverse effects of heat on surrounding equipment. It is said that

The present invention will be described in detail below based on embodiments shown in the drawings.

In the figure, reference numeral 1 denotes a rotor (armature), and a hole 2 extending in the axial direction is provided in the rotor's axial center.

This hole 2 is evacuated and filled with a wick 3 and a working fluid 4 (water, alcohol, etc.) to form a heat pipe 5.

The heat pipe 5 extends to one end of the rotor shaft 6, and has a large number of radiation fins 7 arranged radially around its outer circumference.

Reference numeral 8 denotes a stator (field magnet), which is fixed inside a cylindrical housing 11 sealed with two side walls 9 and 10.

...A case 12 is further disposed on the outer periphery of the housing 11 with a certain gap, and this gap is used as a ventilation path 13, which is a space 1 for accommodating the radiation fins.
It connects to 4.

A cooling fan 15 is provided in the end chamber of the case 12 adjacent to the space 14 in the axial direction and coaxially with the rotor shaft.

Note that 16 in the figure indicates a brush.

Note that the cooling fan 15 is mounted on a fixed frame 17. Stator 18
．． Rotor 19. Fan 20. The fan motor is configured of an axial fan motor including a power supply lead wire 21 and is fixed to the case 12 via the fixed frame 17 so that its central axis is coaxial with the rotor shaft 6.

The rotation direction of the fan 200 can be determined by the polarity of the power supply with respect to the lead wire 21.

Cooling of this motor is performed as follows.

The heat generated by the rotor 1 is transmitted to the evaporation part of the heat pipe 5,
The latent heat of evaporation of the working fluid is conducted to the cooling section of the heat pipe 5, where it is transferred as latent heat of condensation to the radiation fins 7.

The radiation fins 7 rotate together with the rotor 1 and are cooled by air ventilation.

In addition, the cooling fan 15 generates an axial flow and circulates cooling air from the ventilation passage 13 through the radiation fins T.

Therefore, the air flows into the heat radiation fins 7 while cooling the outer periphery of the motor, cools the heat radiation fins 7, and then flows out of the motor.

In the above embodiment, the radiation fins 7 are shown as having a flat plate shape extending in the axial direction, but they may have a spiral shape so as to generate an axial flow of air.

As described above, according to the present invention, the heat pipe is built into the rotor, so it is compact, and the combination of heat radiation fins and a cooling fan improves cooling efficiency.Furthermore, the cooling air does not flow through the gap between the rotor and stator. This has the advantage that the reliability of the motor is not impaired by dirt, moisture, etc.

Further, according to the present invention, since a cooling fan is provided, cooling can be performed even when the rotor is stopped or rotating at low speed, and in addition to the cooling effect in the ventilation passage, a sufficient cooling effect can be achieved.

Therefore, the ventilation capacity of the cooling fan is not affected by the rotational speed of the motor.

Furthermore, the direction of ventilation by the cooling fan can be freely selected (suction, blow), and the selected ventilation direction will not be reversed depending on the rotational direction of the motor.

For this reason, when installing the motor in a machine, the direction of ventilation must be
The most appropriate orientation can be selected in relation to surrounding equipment, and it is ensured that the hot air that cools the motor is blown against equipment that is sensitive to heat or that has a negative impact on accuracy due to thermal expansion. can be prevented.

Furthermore, although conventional propeller-shaped heat dissipation fins have a strong ventilation force, they have the disadvantage of not being able to provide a large heat dissipation area, and radially extending flat plate fins have a large heat dissipation area but have the disadvantage of weak or no ventilation.

In order to achieve sufficient ventilation with self-ventilation by installing a fan on the motor shaft, the mechanical strength required of the blades results in a large inertia load, and a portion of the motor output is consumed for ventilation, so the motor output is However, by using a cooling fan in the present invention, the above-mentioned conflicting demands can be resolved without contradiction, and an extremely large cooling effect can be achieved.

[Brief explanation of drawings]

The drawing shows a servo motor equipped with the cooling device of the present invention,
1 is a rotor, 5 is a heat pipe, 7 is a radiation fin, 8 is a stator, 15 is a cooling fan, and 13 is a ventilation path.

Claims (1)

[Scope of utility model registration request] A heat pipe is provided inside the rotor so as to extend in the axial direction, a heat radiation fin is provided at one end of the rotor so as to be able to conduct heat with the heat pipe, and a case is provided on the outer periphery of the stator housing with a predetermined gap between the housing and the rotor. A ventilation passage is formed between the housing and the case, and an independent driving thermal cooling fan is provided in the case to allow cooling air to flow through the ventilation passage, and the cooling air flows through the housing. A rotating electric machine with a heat pipe designed to cool the radiation fins.