Brushless Motor Serial Parallel Connection Switching
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Solution Overview
Problem
Conventional three-phase brushless motors can only utilize either high torque characteristics or high speed characteristics, as the line resistances and currents are constant, limiting their versatility in adapting to different usage conditions.
Innovation Solution
Incorporating a connection switching section that allows the stator coils to switch between serial and parallel connections, enabling the motor to dynamically adjust torque and speed characteristics based on usage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the stator coils are connected in serial connection, then high torque characteristics are achieved, but rotation speed is limited
Solution Approach 1:
The patent applies the dynamics principle by making the connection configuration dynamic rather than fixed. The connection switching section enables the stator coils to switch between serial and parallel connections based on operating conditions, allowing the motor to adapt its characteristics in real-time. This resolves the contradiction by enabling the system to operate in high-torque mode (serial connection) when needed and high-speed mode (parallel connection) when needed, rather than being constrained to a single static configuration.
Solution Approach 2:
The patent applies parameter changes by altering the electrical connection parameters (serial vs. parallel) to change the motor's torque-speed characteristics. By switching the connection configuration, the effective resistance and current distribution change, which directly affects the torque and speed output. This allows the motor to achieve both high torque and high speed characteristics at different operating points.
2Speed
If the stator coils are connected in parallel connection, then high rotation speed characteristics are achieved, but torque is reduced
Solution Approach 1:
The connection switching section enables dynamic adaptation between parallel connection (for high speed) and serial connection (for high torque). This resolves the contradiction by allowing the system to switch to parallel connection when high rotation speed is required, while maintaining the capability to switch to serial connection when torque needs to be increased, thus eliminating the trade-off constraint.
Solution Approach 2:
By changing the connection parameter from parallel to serial, the motor can adjust its electrical characteristics to compensate for torque reduction. The parameter change in connection configuration allows the system to optimize for speed when in parallel mode and compensate by switching to serial mode when torque enhancement is needed.
3Ease of operation
If constant line resistance and current are used, then simple control is achieved, but versatility in adapting to different usage conditions is limited
Solution Approach 1:
The patent introduces dynamic switching capability through the connection switching section, which allows the motor to adapt to different usage conditions by changing connection configurations. This maintains ease of operation through automated switching control while significantly improving versatility, as the motor can now provide both high-torque and high-speed characteristics based on application requirements.
Solution Approach 2:
The motor achieves multi-functionality by incorporating the connection switching section that enables different connection modes. This single motor design can now serve multiple purposes - acting as a high-torque motor when serial connection is selected and as a high-speed motor when parallel connection is selected - thereby improving versatility without requiring multiple separate motor designs.
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
This solution allows for the simultaneous selection and use of high torque and high rotation speed characteristics, enhancing the motor's adaptability and performance in various applications.
Implementation Method 1
three phase alternating current power is supplied to stator coils of respective phases so as to generate magnetic field. With this, a motor rotor is rotated.
Data Source
AI summary
A brushless motor includes: a motor rotor; a stator coil section which has a plurality of energization phases, which includes a first stator coil and a second stator coil that are provided to each phase, and which is arranged to generate a magnetic field, and thereby rotate the motor rotor; and a connection switching section configured to switch a connection of the first stator coil and the second stator coil from a serial connection to a parallel connection, or from the parallel connection to the serial connection.