Shunt, series and compound motors have different speed-torque behaviours.
Shunt motors give nearly constant speed; series motors give very high starting torque (T∝I²) but dangerous no-load speed; compound motors lie in between; PMDC motors suit small drives. Selection depends on load characteristics.
Starter motors in cars are series DC motors.
Motor types differ in their speed and torque behaviour, so choosing the right one matches the machine to its load.
Shunt, series and compound motors have different speed-torque behaviours.
Motor types differ in their speed and torque behaviour, so choosing the right one matches the machine to its load.
The series motor, because its field current is the armature current, so the torque rises quickly with current.
The shunt motor, because its field stays nearly constant, so the speed changes little with load.
Typical applications include choosing a series motor for a crane hoist that needs high starting torque, selecting a shunt motor for a lathe that needs constant speed and picking a compound motor for a machine with varying load.
Study "DC motors" first (topic 58 of 106 in Electrical Engineering). It covers the groundwork this topic builds on.
Series motors for traction and starters. Never run a series motor unloaded. Universal motors run on AC or DC.
Starter motors in cars are series DC motors.
The next topic is "Induction motors", which builds directly on this one.
It is classed as Intermediate in Electrical Engineering (topic 59 of 106). It is an intermediate topic. Work through the beginner topics in Electrical Engineering first.
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