Electric Motor Hall IC Positioning for Advance Angle Control Stability
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Solution Overview
Problem
Existing electric motor control systems face instability in rotational control due to variations in advance angle, leading to cost increases when using microcomputers for advance angle control, and destabilization of loads driven by the motor.
Innovation Solution
An electric motor design incorporating a stator, rotor, and a driving circuit board with a magnetic-pole-position sensor and control element that adjusts the phase of the driving voltage based on rotation speed information, stabilizing rotational control while minimizing cost by using a control IC for advance angle control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If advance angle control is executed by a microcomputer, then rotational control stability is improved, but manufacturing cost increases significantly
Solution Approach 1:
The patent replaces the expensive microcomputer with a low-cost control IC that executes advance angle control. The control IC is a simpler, cheaper component that can perform the necessary control functions without the full capabilities of a microcomputer, thereby reducing manufacturing cost while maintaining control stability.
Solution Approach 2:
The patent extracts the advance angle control function from the microcomputer and implements it in a dedicated control IC. This separation allows the use of a simpler, cheaper control IC for the specific control task while reducing the overall system cost.
2Ease of manufacture
If advance angle control is executed by a control IC, then manufacturing cost is reduced, but rotational control stability deteriorates
Solution Approach 1:
The patent changes the parameter of the magnetic-pole-position sensor's installation position to create a predetermined phase advance. By positioning the sensor at a specific location where the advance angle is larger than zero when rotor rotation speed is zero, the system achieves stable rotational control with the low-cost control IC, preventing the deterioration of control stability.
3Device complexity
If the magnetic-pole-position sensor is positioned at zero advance angle, then manufacturing simplicity is maintained, but rotational control becomes unstable due to hunting
Solution Approach 1:
The patent applies preliminary action by pre-positioning the magnetic-pole-position sensor at a location that provides a predetermined phase advance before control begins. This advance positioning compensates for the limitations of using a simple control IC, ensuring stable control from the start without requiring complex real-time adjustments.
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 solution effectively stabilizes rotational control of loads while preventing cost increases, improving operational efficiency and reducing noise levels in high rotation speed areas.
Implementation Method 1
a magnetic-pole-position sensor detecting a rotation position of the rotor
Implementation Method 2
a driving element applying a driving voltage to the stator
Data Source
AI summary
An electric motor includes a stator, a rotor provided to be rotatable with respect to the stator, and a driving circuit board including a power IC applying a driving voltage to the stator, a Hall IC detecting a rotation position of the rotor, and a control IC adjusting a phase of the driving voltage in accordance with a magnetic-pole-position signal from the Hall IC and rotation speed information calculated on the basis of the magnetic-pole-position signal. The Hall IC is provided at a position at which an advance angle is larger than zero when a rotation speed of the rotor is zero.