The motor pictured below is known as a?

Question

BlackTom AI · Accepted Answer

A compound cumulative DC motor contains both a shunt (parallel) field winding and a series field winding arranged so their magnetic effects aid one another.

1) Relevant knowledge points and concepts
- DC motor field configurations: series (only series winding), shunt/separately-excited (field winding fed in parallel or from separate supply), permanent-magnet (no field winding), and compound (both series and shunt windings).  
- Compound motors can be cumulative (series and shunt fields aid each other) or differential (they oppose). The schematic symbol for a compound motor shows both a shunt coil across the supply and a series coil in series with the armature.

2) Step-by-step reasoning from the diagram
- The diagram shows two distinct coils: one connected across the two supply terminals (top coil) — this is a shunt (or field) winding.  
- A second coil is shown in series with one terminal and the armature (left bottom coil), indicating a series winding through which armature current flows.  
- Because both windings are present in the single motor circuit (one shunt, one series) this is a compound configuration.

3) Calculations / intermediate steps
- No numerical calculation is required; identification is by circuit topology: presence of both parallel (shunt) and series field windings.

4) Why the correct answer is correct
- The presence of both a shunt and a series field winding connected to the same supply is the defining characteristic of a compound motor. The diagram’s topology matches a cumulative compound (standard compound) motor symbol.

5) Why the other options are incorrect
- Separately excited: would show the field supplied from a separate source, not both coils tied to the same supply as shown.  
- Permanent magnet: would have no field windings drawn (permanent magnets instead).  
- Series: would show only a single series winding (no shunt coil across the supply).

6) Conclusion
- Therefore the motor pictured is a compound cumulative motor, which matches the provided answer: Compound Cumulative.

The motor pictured below is known as a?单项选择题

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