一种基于电气量的直流电机多级启动回路
By using a voltage relay in the DC motor starting circuit to monitor the armature voltage in real time, the problem of high failure rate of time relays is solved, and a highly reliable multi-stage starting system is achieved, adapting to different operating conditions and avoiding starting failure and winding damage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA RESOURCES POWER (CHANGSHU) CO LTD
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-17
AI Technical Summary
In traditional DC motor starting circuits, time relays have a high failure rate, leading to improper removal of the starting resistor, resulting in starting failure and poor reliability, and they cannot adapt to different starting conditions.
By replacing the time relay with a voltage relay, multi-stage starting can be achieved by monitoring the motor armature voltage in real time and controlling the timing of resistor disconnection using the voltage relay, thus adapting to different operating conditions.
It improves the reliability and smoothness of DC motor starting, enhances adaptability to different operating conditions, and avoids starting failure and winding damage.
Smart Images
Figure CN224520952U_ABST
Abstract
Claims
1. A multi-stage starting circuit for a DC motor based on an electrical quantity, comprising a power supply circuit of the motor, in which a voltage dividing resistor is connected in series, and a switch K of a relay is connected in parallel to both ends of the voltage dividing resistor, characterized in that, The relay is a voltage relay, which is connected to the motor adapter to collect the armature voltage of the motor. When the armature voltage of the motor is lower than the set value of the corresponding voltage relay, the coil RE of the voltage relay is energized, the switch K of the voltage relay is closed, and the voltage divider resistor is short-circuited.
2. The multi-step starting circuit for a DC motor based on electrical quantities as recited in claim 1, wherein, The voltage relay includes a controller U1, which is connected to the coil RE of the voltage relay via a control circuit. The positive input terminal of the motor is connected to one end of the sampling resistor R6, the other end of the sampling resistor R6 is connected to one end of the sampling resistor R7, the other end of the sampling resistor R7 is connected to the negative input terminal of the motor, and one end of the sampling resistor R6 connected to the sampling resistor R7 is connected to the controller U1, thus inputting the sampling signal V1 of the armature voltage of the motor to the controller U1.
3. The multi-step start circuit for a DC motor based on electrical quantities as defined in claim 2, wherein, The control circuit includes a resistor R1, a transistor Q1, and a transistor Q2. The controller U1 is connected to the resistor R1 and sends a control signal RELAY to the resistor R1. The other end of the resistor R1 is connected to one end of the resistor R2 and the base of the transistor Q1. The other end of the resistor R2 is grounded. The collector of the transistor Q1 is connected to one end of the resistor R3, and the emitter of the transistor Q1 is grounded. The other end of the resistor R3 is connected to the base of the transistor Q2. The collector of the transistor Q2 is connected to the power supply VCC. The emitter of the transistor Q2 is connected to the input terminal of the coil RE of the voltage relay, and the output terminal of the coil RE is grounded.
4. The multi-step starting circuit for a DC motor based on electrical quantities as recited in claim 1, wherein, The input terminal of the coil RE is connected to the negative terminal of the diode D1, and the positive terminal of the diode D1 is grounded.
5. The multi-step starting circuit for a DC motor based on electrical quantities as recited in claim 1, wherein, There are multiple voltage divider resistors, which are connected in series in the power supply circuit of the motor. Each voltage divider resistor has a relay switch K connected in parallel to its two ends.
6. The multi-step start circuit for a DC motor based on electrical quantities as defined in claim 2, wherein, The controller U1 is a micro MCU controller.