Induction motors are widely used in heavy-duty applications due to o their ir rogurness and efficiency. Calculating the starting torque and accelegation is essential for ensuring proper operation and selectin g apparabable motors for specific tasks. Thies article explains these key concepts involved in these colations.

Understanding Starting Torque

Starting torque is the torque developed that e motor when it begins to rotate from standstill. It mutt be desiment to overcome thee inertia of thee load ande any static friction. The value depends on thee motor design ande thee supply voltage.

I n induction motors, thee startin g torque can be estimated using thee torque- slip criteristic. It i s often expressed as a multiple of thee motor 's full- load torque, typically ranging from 1.5 t o 3 time, dependiing on thee rotor design and d supply conditions.

Calculating Starting Torque

Te zbliżone do początku torque (T is 1; Xi1; FLT: 0 Xi3; Xi3; start1; Xi1; FLT: 1 Xi3; Xi3;) can be calculated using the formula:

Xi1; Xi1; FLT: 0 XI3; XI3; T XI1; XI1; FLT: 1 XI3; XI3; XI1; FLT: 2 XI3; XI3; XI3; FLT: 3 XI3; XI3; XI1; FLT: 4 XI3; XI3;) XI1; XI1; FLT: 5 XI3; XI3; XI1; XI1; FLT: 6 XI3; X3; / R XI1; XI1; FLT: 7 XI3; XI3; R XI1; XI1; FLT: 8 XI3; XIX3; X3; XIX3; XIX1; FLT: 9 XIX33;

Kiedy:

  • Xi1; Xi1; FLT: 0 Xi3; Xi3; k Xi1; Xi1; FLT: 1 Xi3; Xi3; = constant depending on motor design
  • Xi1; Xi1; FLT: 0 Xi3; Xi3; V Xi1; Xi1; FLT: 1 Xi3; Xi3; Xi3; Ph Xi1; Xi1; FLT: 2 Xi3; Xi1; FLT: 3 Xi3; Xi3; = faze voltage
  • (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (2); (3); (1); (1); (1); (1); (1); (1); (1); (1); (2); (2); (1); (1); (1); (1); (2); (1); (1); (1); (1); (1); (1); (2); (2); (2); (2); (2); (3) (3); (3); (3); (3); (3); (3); (3); (3); (3); (3); (3); (2); (2) (2) (2) (2) (3) (4) (4) (4) (4) (4) (4) (4) (4) (4

Calculating Acceleration

Acceleration is determinate by thee net torque acting on thee rotor and thee momento of inertia of thee load. The basic relation is:

(zob. pkt 2.1.1.1 niniejszego załącznika)

Kiedy:

  • Xi1; Xi1; FLT: 0 Xi3; Xi3; α Xi1; Xi1; FLT: 1 Xi3; Xi3; = angular akceleration
  • (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (1); (2); (2); (3); (1); (1); (3); (3); (3); (3); (3); (3); (3); (3); (2); (3); (2); (3); (3); (3); (3); (3); (3) (3); (3) (3); (3) (7); (3) (3) (3); (3) (3) (7) (3) (7) (3) (7) (3) (3) (7) (7) (7) (7) (7) (7) (7) (7) (7) (7) (7) (7) (7) (7) (7) (7) (7) (7) (7) (7) (7) (7)
  • Xi1; Xi1; FLT: 0 Xi3; Xi3; J Xi1; Xi1; FLT: 1 Xi3; Xi3; = moment of inertia of the rotor and load

By knowing thee starting torque and thee load 's inertia, ingelers can estimate thee akceleration time and d ensure thee motor can reach operation l speed with in desired limits.