Brushless Motor Controller Rotor Positioning
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Solution Overview
Problem
Conventional brushless motor control systems require a long time to start up due to extensive processing before the motor can begin operation, including target value calculation, transmission, and rotor positioning, which affects starting performance.
Innovation Solution
A control system for a brushless motor that includes a main ECU for determining target values and a motor controller with a position detection section, allowing the motor controller to perform rotor positioning by supplying current to a specified phase coil before receiving the target value from the main ECU, thereby shortening the startup time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the control system waits for target value calculation and transmission from main ECU before performing rotor positioning, then the control sequence is orderly and simple, but the motor startup time is prolonged
Solution Approach 1:
The motor controller performs rotor positioning in advance before receiving the target value from the main ECU. When power is supplied, the controller immediately supplies current to the specified phase coil to position the rotor, rather than waiting for the main ECU to complete target value calculation and transmission. This preliminary action reduces the overall startup time of the motor control system.
2Productivity
If the motor controller performs rotor positioning before receiving the target value, then the startup time is shortened, but the control system must handle unsynchronized operation states
Solution Approach 1:
The motor controller performs rotor positioning in advance before receiving the target value from the main ECU. When power is supplied, the controller immediately supplies current to the specified phase coil to position the rotor, rather than waiting for the main ECU to complete target value calculation and transmission. This preliminary action reduces the overall startup time of the motor control system.
Solution Approach 2:
The motor controller uses feedback from the position detection section to monitor the rotor's rotation position and adjust the current supply to the phase coils accordingly. This feedback mechanism ensures that even when positioning starts before target value reception, the rotor can be accurately positioned and the control can be synchronized once the target value is received, maintaining control 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
This approach enables the brushless motor to start operation more quickly by initiating rotor positioning immediately upon power supply, reducing the overall startup time and improving starting performance.
Implementation Method 1
a position detection section (14) which detects a rotation position of the rotor
Implementation Method 2
The motor controller (20) performs rotor positioning processing for the rotor by supplying a current to a specified phase coil of the stator coil set
Data Source
AI summary
A motor controller is configured to perform positioning of a rotor of a brushless motor immediately when power supply is turned on, and not after actually receiving a target value related to control for the brushless motor from a main ECU, which determines the target value. The motor controller finishes or is performing the rotor positioning, when the target value is received from the main ECU. For this reason, the motor controller can start rotation control for the brushless motor in accordance with the received target value in a short period of time.