Why don't switches appear in circuit diagrams of DC motors

Simple Dc Motor Circuit Diagram

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Is this circuit correct for a DC motor driver? - Electrical Engineering

Single-phase induction motor working

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Why don't switches appear in circuit diagrams of DC motors
Why don't switches appear in circuit diagrams of DC motors

All About Shunt DC Motors – What They Are and How They Work
All About Shunt DC Motors – What They Are and How They Work

Is this circuit correct for a DC motor driver? - Electrical Engineering
Is this circuit correct for a DC motor driver? - Electrical Engineering

Single-Phase Induction Motor Working | Electrical Academia
Single-Phase Induction Motor Working | Electrical Academia

DC Motor or Direct Current Motor
DC Motor or Direct Current Motor