GEARLESS ELECTRIC LIFT DRIVE (VERSIONS) Russian patent published in 2017 - IPC B66B11/04 H02K3/32 H02K17/16 

FIELD: electricity.

SUBSTANCE: gearless electric lift drive contains a cab suspension, a frequency converter (9) with the possibility of forming voltages with frequencies lowered in relation to the network frequency (10), and a low-frequency induction motor (1) connected to the output of the frequency converter (9) and designed to operate with the indicated stresses. The highest value of the reduced frequency at the output of the frequency converter (9) is set depending on the set nominal speed of the lift cab in accordance with the expression ƒ_n=ν_nomi_psp/πD_s≤0,8ƒ_c, where ƒ_n - the highest value of the reduced frequency at the output of the frequency converter; ν_nom - the specified nominal speed of the lift cab; i_ps - multiplicity of the polyspast cab suspension; p - the number of pole pairs of the induction motor stator winding; D_s - the diameter of the lift traction sheave; ƒ_c - the frequency of the supply network. The stator windings of the low-frequency motor are made for the rated network voltage and the largest value of the reduced frequency. The variants of the gearless electric lift drive are also proposed.

EFFECT: simultaneously with the reduction of the current in the stator winding of the drive motor, reducing the dimensions and cost of the drive induction motor.

3 cl, 2 dwg