Magnetic Sensor for Synchronous Motor Rotor Direction Control
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Solution Overview
Problem
Conventional synchronous motors have low efficiency due to a low starting point and inconsistent rotor direction, leading to inefficient operation in applications like fans and water pumps, as they rely on a fixed starting direction which is not guaranteed by existing magnetic sensor technologies.
Innovation Solution
A magnetic sensor system that detects external magnetic fields and adjusts its operating state based on predetermined conditions, using a magnetic field detecting circuit, output control circuit, and state control circuit to ensure consistent rotor direction and reduced energy consumption by controlling a bidirectional AC switch in the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional synchronous motor uses a fixed starting point to ensure consistent rotor direction, then the rotor direction can be controlled, but the motor cannot operate at a relatively high working point, resulting in low efficiency
Solution Approach 1:
The patent applies dynamics by making the starting point adjustable rather than fixed. The controller can dynamically set different starting points based on operational requirements, allowing the motor to operate at higher working points while still ensuring consistent rotor direction through controlled starting sequences.
Solution Approach 2:
The patent changes the parameter of starting point position from a fixed value to a variable that can be adjusted. By modifying the starting point parameter dynamically, the system achieves both consistent rotor direction and improved operational efficiency at higher working points.
2Measurement precision
If the conversion circuit constantly outputs power for the position sensor to ensure accurate magnetic pole position detection, then the detection accuracy is maintained, but the electric energy consumption is excessive
Solution Approach 1:
The patent implements periodic action by controlling the conversion circuit to output power intermittently rather than continuously. The position sensor receives power only when needed for detection, reducing energy consumption while maintaining detection accuracy through timely power delivery during operational phases.
Solution Approach 2:
The system uses self-service by integrating the position sensor power supply directly from the motor's power circuit. The sensor utilizes the existing power phases and timing signals from the motor operation to derive its power, eliminating the need for a separate constant power supply and reducing overall energy consumption.
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 magnetic sensor system enhances the efficiency of synchronous motors by ensuring consistent rotor direction and reducing energy wastage, improving operational efficiency and reliability in applications like fans and water pumps.
Implementation Method 1
a magnetic field detecting circuit, configured to detect an external magnetic field and output a magnetic induction signal that is indicative of information related to the external magnetic field
Implementation Method 2
The magnetic sensor applies Hall effect, in which, when current I runs through a substance and a magnetic field B is applied in a positive angle with respect to the current I, a potential difference V is generated in a direction perpendicular to the direction of current I and the direction of the magnetic field B
Data Source
AI summary
The present teaching relates to a method/apparatus for a magnetic sensor. The apparatus of the magnetic sensor resides in a housing and includes an input port and an output port, both extending from the housing. The apparatus also includes an electrical circuit which comprises a magnetic field detecting circuit, configured to detect an external magnetic field and output a magnetic induction signal that is indicative of information related to the external magnetic field, an output control circuit coupled between the magnetic field detecting circuit and the output port, and a state control circuit coupled with the output control circuit and configured to determine whether a predetermined condition is satisfied and signal the same to the output control circuit. When the predetermined condition is satisfied, the state control circuit is at least responsive to the magnetic induction signal to enable the output control circuit to control the magnetic sensor to operate in at least one of a first state and a second state. In the first state, a load current flows in a first direction from the output port to outside of the magnetic sensor. In the second state, a load current flows in a second direction opposite of the first direction from outside of the magnetic sensor into the magnetic sensor via the output port. When the predetermined condition is not satisfied, the state control circuit enables the output control circuit to control the magnetic sensor to operate in a third state.