Cloud Motor Speed Feedback Without Encoder Power Cables
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Solution Overview
Problem
The installation disorder and data transmission interference caused by long-distance power cables in traditional motor systems, particularly in servo motors, due to the need for separate power and data connections between the driver and the motor body.
Innovation Solution
A cloud motor system that integrates a controller with an induction coil on the stator winding to generate induced alternating current, which is converted to direct current for power supply and used to determine real-time rotational speed, eliminating the need for long-distance power cables and replacing the encoder function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a long-distance power cable is used to supply power to sensors near the motor body, then the power supply problem is solved, but the installation becomes disordered and data transmission is interfered with
Solution Approach 1:
The patent combines the power supply function and data transmission function into a single communication cable. The driver transmits both power and data signals through the same cable, eliminating the need for separate power cables and data cables, thus simplifying installation and avoiding interference
Solution Approach 2:
The communication cable is designed to serve multiple functions: it provides power supply to the controller and sensors, transmits data bidirectionally, and enables communication between the driver, controller, and sensors. This multi-functional design replaces the traditional separate cables for power and data
2Measurement precision
If an encoder is used for closed-loop control, then the control precision is improved, but the device complexity and installation difficulty increase
Solution Approach 1:
The patent extracts the speed sensing function from the traditional encoder and implements it through software algorithms in the controller. The controller calculates rotational speed by detecting the frequency of current waves from the motor windings, eliminating the need for physical encoders and their associated complex wiring
Solution Approach 2:
The patent replaces the mechanical encoder system with an electrical/software-based solution. Instead of using mechanical encoders with physical shafts and scales, the system uses electrical current wave analysis and digital signal processing to achieve speed feedback, simplifying the mechanical structure
3Adaptability or versatility
If multiple separate cables are used for power and data transmission, then the functions are clearly separated, but the installation becomes disordered and maintenance becomes difficult
Solution Approach 1:
The patent merges multiple cable functions into a single integrated communication cable that handles both power transmission and data communication. This reduces the number of cables from multiple separate connections to a single cable, greatly simplifying installation and maintenance while maintaining clear functional separation through software protocols
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 system achieves closed-loop control and accurate monitoring of motor speed without long-distance power cables, reducing installation disorder and data transmission interference, and enabling efficient power supply to modules and sensors.
Implementation Method 1
the induction coil is configured to generate an induced alternating current when the motor body rotates and transmit the induced alternating current to the controller
Implementation Method 2
the rectification module is configured to convert the received induced alternating current into the direct current, and use the direct current to supply power to the controller
Data Source
Figure 1~2
Figure 3~4
AI summary
The present application provides a cloud motor and a control method for the cloud motor, which relates to the field of motors. A motor body of the cloud motor is connected to a driver through a power cable; the driver is configured to send a driving instruction to the motor body; the motor body includes an induction coil provided on a stator winding, a head and a tail of the induction coil are both electrically connected to the controller, and the induction coil is configured to generate an induced alternating current when the motor body rotates and transmit the induced alternating current to the controller; the controller is configured to convert the induced alternating current into a direct current so as to supply power to modules inside the controller; and the controller is configured to determine a real-time rotational speed of the motor body according to an alternating frequency of the induced alternating current, and transmit the real-time rotational speed to the driver; and the driver is further configured to modify the driving instruction according to the received real-time rotational speed, and send the modified driving instruction to the motor body. The cloud motor of the present application can avoid the installation disorder and data transmission interference caused by the long-distance power cable on the motor by self-power generation.