Coaxial Servo Motor Pump with Integrated Controller and Oil Cooling
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Solution Overview
Problem
Current hydraulic systems lack a deeply integrated form of 'coaxially integrated motor and pump+integrated drive controller', which is essential for applications requiring man-machine friendliness, simple use, energy conservation, high efficiency, low noise, and good cost performance.
Innovation Solution
A coaxial integral servo motor pump module integrates the servo motor and hydraulic pump coaxially, with a drive controller, enabling high dynamic response, variable speed operation, and efficient energy conservation, featuring a sealed electrical connector and internal cooling oil circuits to maintain reliability and reduce heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the servo motor and hydraulic pump are integrated coaxially with an integrated drive controller, then the degree of integration and control efficiency are improved, but the device complexity increases
Solution Approach 1:
The patent merges the servo motor, hydraulic pump, and drive controller into a single integrated unit. The motor and pump share a common housing with coaxial alignment, and the controller is mounted on the housing, creating a unified assembly that reduces the number of separate components and simplifies the overall system architecture.
Solution Approach 2:
The integrated housing serves multiple functions: it contains the servo motor, accommodates the hydraulic pump, provides mounting for the controller, and incorporates cooling channels. This multi-functionality reduces the need for separate structural components and enhances the degree of integration while managing complexity through functional consolidation.
2Loss of energy
If the servo motor pump is deeply integrated with coaxial motor and pump plus integrated drive controller, then energy conservation and efficiency are improved, but the manufacturing complexity increases
Solution Approach 1:
The integrated unit is divided into distinct functional modules: the servo motor assembly, the hydraulic pump assembly, and the controller module. Each module can be manufactured and tested separately before final assembly, which reduces manufacturing complexity while maintaining the energy efficiency benefits of deep integration.
Solution Approach 2:
The hydraulic pump is positioned coaxially within the motor housing, with the pump rotor nested inside the motor stator assembly. The controller is mounted on the external surface of the housing. This nested arrangement maximizes space utilization and achieves deep integration without proportionally increasing manufacturing difficulty.
3Area of stationary object
If the motor and pump are integrated coaxially in the same housing, then the mounting space is reduced, but the heat dissipation difficulty increases
Solution Approach 1:
The patent uses the hydraulic fluid itself as a cooling medium. Cooling channels are incorporated into the motor housing, allowing hydraulic oil to flow through and absorb heat from both the motor and pump components. This hydraulic cooling approach utilizes the existing fluid system to solve heat dissipation without requiring separate cooling infrastructure.
Solution Approach 2:
The hydraulic fluid serves dual functions: power transmission and heat dissipation. The same fluid that transmits mechanical power also flows through cooling channels to remove heat, eliminating the need for separate cooling systems and maintaining compact mounting space while addressing thermal management.
4Device complexity
If the drive controller is integrated with the motor and pump, then the wiring and control complexity are simplified, but the reliability requirements increase
Solution Approach 1:
The controller is electrically isolated from the high-voltage motor windings and hydraulic fluid environments through separate mounting on the housing exterior. Electrical connections are made through sealed feedthroughs, extracting the controller from potentially harmful environments while maintaining integrated control. This separation protects the controller from electrical interference and fluid contamination.
Solution Approach 2:
The housing structure acts as an intermediary barrier between the controller and the harsh environments of the motor and hydraulic system. Sealed electrical feedthroughs and mounting flanges serve as intermediate connection points that maintain electrical connectivity while providing environmental isolation, thus enhancing reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The integrated system achieves rapid assembly, reduced mounting time, simplified wiring, and enhanced cooling, ensuring reliable long-term operation with high efficiency and energy savings.
Implementation Method 1
a cooling structure, which comprises a valve plate and a central hole penetrating the rotating shaft... The valve plate is provided with a low-pressure oil drain hole... One end of the central hole is communicated with external cooling oil...
Data Source
Figure 1~2
Figure 3~4
Figure 5a~6
AI summary
A drive and control integrated servo motor pump and cooling structure, comprising a plunger pump assembly (5), a servo motor assembly (6), a drive controller (2), a drive and control housing, and a rear housing (35). The rear housing (35) is connected to one end of a motor pump housing (7); a controller mounting cavity, a first cavity (71), and a second cavity (72) are provided inside an overall structure formed by the motor pump housing (7) and the rear housing (35); the first cavity (71) is used for accommodating the plunger pump assembly (5); the second cavity (72) is used for accommodating the servo motor assembly (6); the plunger pump assembly (5) comprises a plunger pump rotor; the servo motor assembly comprises a stator component (8) and a rotor component (23); the plunger pump rotor and the rotor component (23) are coaxially connected by means of a rotating shaft (25); the controller mounting cavity is used for accommodating the drive controller (2); the servo motor assembly (6) is used for driving the plunger pump assembly (5) to implement forward and reverse rotation; and the drive controller (2) is used for driving and controlling the servo motor assembly (6) to operate. Drive and control functions are coaxially integrated, and the cooling effect is good.