Bi-power Motor Control System for Noise Reduction
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Solution Overview
Problem
Conventional motor controlling systems have a limited controllable rotational-speed range due to the operation voltage of the driver, which is insufficient for meeting industrial demands and results in high noise levels due to excessive current.
Innovation Solution
A bi-power motor controlling system that uses a pulse width modulation module to adjust the duty cycle of control signals and increases power voltage to reduce motor current and noise, comprising a motor, system apparatus, and motor controlling apparatus with a sensor, controller, driving circuit, and pulse width modulation module to detect phase commutation and adjust rotational speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the driver uses the same power source for operation voltage, then the circuit design is simple, but the controllable rotational-speed range is too narrow
Solution Approach 1:
The power source is segmented into two independent power sources: a first power source for providing operation voltage to the driver, and a second power source for providing power to the motor. This segmentation allows the driver and motor to have independent voltage control, enabling a wide controllable rotational-speed range while keeping the circuit design manageable through clear functional separation.
2Device complexity
If conventional motor controlling systems are used, then the system structure is simple, but the noise level is high due to excessive current
Solution Approach 1:
The power supply system is segmented into two independent power sources, allowing separate optimization of voltage and current parameters. The first power source provides stable operation voltage to the driver, while the second power source provides power to the motor with optimized current characteristics, thereby reducing noise without significantly increasing system complexity.
Solution Approach 2:
By changing the power supply parameters from a single voltage source to two independent power sources with different voltage levels, the system achieves better current control. This parameter change allows the motor to operate with optimized current characteristics, reducing electromagnetic noise while maintaining effective system control.
3Object-affected harmful factors
If power voltage is increased to reduce motor current, then noise is reduced, but the requirement for power supply capability increases
Solution Approach 1:
The power supply requirements are segmented between two specialized power sources. The first power source is optimized for providing stable operation voltage to the driver circuit, while the second power source is optimized for providing appropriate voltage and current to the motor. This segmentation allows each power source to be sized and designed for its specific function, avoiding the need for a single high-capability power source.
Data Source
AI summary
A bi-power motor controlling system includes a motor, a system apparatus and a motor controlling apparatus. The system apparatus has a rotational-speed target value for determining the targeted rotational speed of the motor. In addition, the system apparatus outputs a first power and a second power to the motor and the motor controlling apparatus, respectively. The motor controlling apparatus detects the motor to obtain a first rotational-speed value of the motor, and then adjusts the rotational speed of the motor to a second rotational-speed value according to the first rotational-speed value. Then, the motor controlling apparatus further generates a rotational-speed feedback signal to the system apparatus. The system apparatus adjusts the outputted first power in accordance with the rotational-speed feedback signal to make the rotational speed of the motor reach the rotational-speed target value.