A control system for motor wide speed

Abstract

The invention discloses a wide-range speed control system for a motor. The system comprises a power supply module, a signal processing and logic control module, a serial / parallel switching module, a PWM and power driving module, a grid driving power supply module, a current detection module and the symmetrical-winding motor, wherein the power supply module is connected with the serial / parallel switching module, the PWM and power driving module and the grid driving power supply module, the serial / parallel switching module is connected with the PWM and power driving module, and the PWM and power driving module is detected by the current detection module and then connected with the symmetrical-winding motor; and the grid driving power supply module comprises multiple output ends, and the output ends are connected with the serial / parallel switching module and the PWM and power driving module respectively. The system can multiply the high-efficiency rotation speed area of the motor by using only one independent power supply, the motor performance is improved greatly, and the energy utilization rate is increased.

Description

technical field [0001] The invention relates to the field of motors and their control, in particular to a control system for wide-speed motors. Background technique [0002] As we all know, the maximum efficiency speed range of the motor has a range. When it exceeds this range, the efficiency of the motor will drop sharply. In most cases, the motor can only be designed at a certain speed with the longest working time in the working condition. Moreover, in order to take into account the motor torque at low speed and the efficiency at low speed, the maximum speed of the traditional single-winding motor is often limited. [0003] The low efficiency of the motor at low speed is caused by comprehensive factors, mainly for the following reasons: [0004] 1. Existing various types of motors use current to generate a magnetic field through a conductive coil, and use this magnetic field to interact with another magnetic field or magnetic circuit to generate torque to drive the motor...

AI Technical Summary

Problems solved by technology

[0015] 1. Requires n independent power supplies for power supply, which is costly and complicated in practical applications

Especially in battery-powered systems, multiple battery packs are used, which is a big trouble for charging and battery management

[0016] 2. The battery pack needs to be switched in parallel by a switch. If it is a battery-powered system, the voltage of the battery cannot be completely equal due to individual differences, and the internal resistance of the battery is very small, so there is a large difference in the process of parallel connection. Inrush current, it is easy to damage the switch and cause unreliability to the system

[0017] 3. In the case of windings with n greater than 2, there can only be two states of all in parallel or all in series, and there is no intermediate transition state, resulting in unsmooth switching of the motor

In the case of a large number of n, since the windings are all connected in series, the induced electromotive force of the winding itself will be added together, and the working speed range of the motor becomes very narrow when it is fully connected in series, and the purpose of widening the speed range of the motor cannot be achieved.

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