DC motor excitation current circuit

FIG T is the excitation transformer, R is a varistor, and there are rectifier diodes to protect against breakdowns from VDii to VD16; Rz and C2 provide resistive-capacitive protection. The circuit is designed to absorb voltage from the magnetic field side, and the KA magnetic field loss of pressure relay is used to prevent DC motor M from experiencing failures due to magnetic coaster accidents; BQ-M refers to the excitation windings of DC motor M.

The described circuit involves an excitation transformer (T) that plays a critical role in supplying the necessary voltage to the DC motor (M) while ensuring operational safety. The varistor (R) is strategically placed to clamp voltage surges, thus protecting the circuit from transient overvoltages. The inclusion of rectifier diodes further enhances protection by preventing reverse current flow, which could lead to component failure. The specific breakdown voltage range from VDii to VD16 indicates that these diodes are selected based on their voltage ratings to match the operational parameters of the circuit.

The resistive-capacitive protection provided by Rz and C2 serves to filter out high-frequency noise and stabilize the voltage across the excitation transformer, ensuring that the motor operates smoothly without interference from electromagnetic interference (EMI) or other transient disturbances.

The circuit's capability to absorb voltage from the magnetic field side is crucial for maintaining the integrity of the system, especially in scenarios where magnetic field fluctuations could induce unwanted voltages. The KA magnetic field loss of pressure relay is an essential safety feature that monitors the magnetic field's integrity and activates protective measures if a loss is detected, preventing potential damage to the DC motor (M) from magnetic coaster accidents.

Finally, the BQ-M designation for the excitation windings of the DC motor (M) indicates the specific configuration and characteristics of these windings, which are designed to ensure efficient operation while minimizing losses. Overall, this circuit design reflects a comprehensive approach to safeguarding the operation of the DC motor in the presence of magnetic field disturbances, ensuring reliability and longevity in its application.FIG, T is the excitation transformer, R, varistor, rectifier diodes to protect against VDii ~ VD16 breakdown; Rz, C2 resistive capacitor protection circuit to absorb the magnetic field-side voltage; KA magnetic field loss of pressure relay Electric to avoid DC motor M due to loss caused by magnetic coaster accidents; BQ-M DC motor M excitation windings.