JPS6245493Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an ultra-slim submersible motor using a non-commutator motor, and aims to improve the power supply structure to the drive circuit.

A submersible motor that uses a non-commutator motor can easily achieve high-speed rotation of 6,000 to 10,000 rpm, which is difficult to achieve with an induction motor, and therefore the connected submersible pump can obtain high pressure and high water volume even if the impeller is small. This makes it possible to manufacture pumps with a narrow outer diameter.

On the other hand, commutatorless motors require a dedicated drive circuit due to their configuration, and the drive circuit must be integrated with the motor.In this case, the drive circuit section, motor section, and pump section are arranged coaxially in the order from the bottom. The most rational design for constructing an ultra-slim submersible electric motor is when it is placed in the submersible motor.

However, the drawback of this method is the handling of lead wires. In other words, power is supplied from a ground power source to the motor section via a cable, and the cable and motor lead wire are connected at the top of the motor section using a connector, etc.
In general, when using an induction machine, the motor lead wire originates from the upper part of the stator coil end. The waterproof reliability of connection parts such as connectors is a major factor in determining the lifespan of the product. Since a commutatorless motor is a system in which power is directly supplied to the drive circuit, when arranged in the configuration described above, the motor lead wires originate from the drive circuit, pass through the inside or outside of the motor section, and are installed at the top of the motor section. must be carried to the connection point with the attached cable.

If the outer diameter of the motor is large, or if there is a large difference between the outer diameter of the motor and the inner diameter of the well, holes or recesses can be provided inside and outside the motor part for the motor lead wires to pass through. When it comes to ultra-slim submersible pumps, due to physical, electrical, and magnetic constraints,
It becomes impossible to provide holes and recesses as described above inside and outside the motor section.

The present invention overcomes the above-mentioned problems and makes it possible to manufacture an ultra-slim submersible motor using a non-commutator motor in which a drive circuit is integrated.

An embodiment of the present invention will be described below with reference to the accompanying drawings. In the figure, 1 is a pump section, 2 is a motor section, and 3 is a drive circuit section, which are installed coaxially, and a motor coil 5 wound around a stator 4.
A lead wire 6 is wired from the drive circuit section 3 toward the drive circuit section 3. On the other hand, an insulated wire 7 from which the sheath of the power supply cable 7 has been removed in order to obtain power to the drive circuit section 3
A is provided with a waterproof seal 9 at the motor upper end plate 8, enters the motor, passes through the stator slot 10 as shown in FIG. 2, and is directly connected to the drive circuit section 3.

According to the above configuration, it is possible to effectively utilize the limited space of an ultra-slim motor for wiring, and to avoid problems with the reliability of waterproof seals caused by water intrusion into conventional connections. In addition, the connection between the motor lead wire and the power supply cable can be eliminated, and a waterproof seal can be achieved only by the close contact between the power supply cable and the upper end plate of the motor, greatly improving sealing performance. A great effect can be obtained when making submersible electric motors, especially those with extremely small outer diameters.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a submersible electric motor according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the motor section. 2...Motor section, 3...Pump section, 7...Power supply cable, 10...Status slot.

Claims (1)

[Scope of utility model registration request] The pump part, the motor part consisting of a non-commutator motor that drives this pump part, and its drive circuit part are sequentially arranged coaxially and assembled together, and a power supply cable is introduced from the pump side, and a power supply cable is introduced from the pump side. An ultra-slim submersible motor characterized in that the cable is sealed with the upper end plate of the motor and placed inside the motor, and the power supply cable is passed through the stator slot and connected directly to the drive circuit.