The type of induction motor that typically has high starting torque is the squirrel cage induction motor. This motor design features robust construction with a cage-like rotor consisting of bars or conductors connected at both ends by shorting rings. When the motor is started, the rotating magnetic field produced by the stator induces currents in these rotor bars, generating torque. Squirrel cage motors are known for their ability to produce high starting torque due to their rugged construction and the way the rotor bars interact with the rotating magnetic field. This design allows them to handle heavy loads and start under high torque conditions, making them suitable for applications requiring a strong starting capability, such as pumps, compressors, and conveyors.
Among various types of motors, DC motors are well-known for their high starting torque capabilities. This is because DC motors can achieve high torque even at low speeds, thanks to the way current flows through the armature windings and the use of commutators to maintain torque directionality. DC motors are particularly effective in applications requiring precise control over starting torque and speed, such as in electric vehicles, robotics, and industrial machinery. The ability of DC motors to provide substantial torque from a standstill position makes them advantageous in scenarios where rapid acceleration or high torque at low speeds is crucial.
The type of induction motor that typically has more starting torque is the wound rotor induction motor. Unlike squirrel cage motors, wound rotor motors feature a rotor with windings connected to slip rings, allowing for external resistance to be added during startup. By varying the resistance in the rotor circuit, the starting torque of the motor can be adjusted to suit the application requirements. Wound rotor motors are favored in situations where high starting torque and adjustable speed characteristics are needed, such as in crane hoists, elevators, and heavy industrial machinery where loads vary significantly.
Comparing different motor types for their starting torque capabilities, DC series motors are renowned for developing higher starting torque relative to other motor types. DC series motors achieve this by their unique construction where the field winding is connected in series with the armature windings. This configuration enables the motor to generate maximum torque at startup and during low-speed operation, making DC series motors ideal for applications requiring high starting torque, such as in electric trains, power tools, and appliances where rapid acceleration and torque are critical.
Among the following motor types—squirrel cage induction motor, wound rotor induction motor, synchronous motor, and DC motor—the DC motor typically has the highest starting torque. DC motors are capable of delivering substantial torque from standstill due to their design with a separately excited field winding and commutator mechanism. This setup allows DC motors to maintain high torque across a wide range of speeds and loads, making them versatile in applications requiring rapid acceleration, precise control over torque, and high starting torque, such as in electric vehicles, industrial machinery, and aerospace systems.