Z-RANGE GEARLESS: SYNCHRONOUS WITH PERMANENT MAGNETS - AC DRIVE FOR ELEVATORS - LEROY SOMER - (Version JPG) - Page n° 9 - PDF Catalogue | Technical Documentation

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GEARLESS A.C. drive for elevators Synchronous with permanent magnets - Z range

General information

Power - Torque - Efficiency - Power Factor (Cos pp)

DEFINITIONS

The output power (Pu) at the motor shaft is linked to the torque (M) by the equation: Pu = M.co

where Pu is in W, M is in N.m, to is in rad/s and where to is expressed as a function of the speed of rotation in min^-1 by the equation:

to = 2it.N/60 The active power (P) drawn from the mains is expressed as a function of the apparent power

(S) and the reactive power (Q) by the equation:

S = Jp² + Q²(S in VA, P in W and Q in VAR)

The power P is linked to the output power Pu by the equation:

The output power Pu at the motor shaft is expressed as a function of the phase-to-phase mains voltage (U in Volts), of the line current absorbed (I in Amps) by the equation:

Pu = U.I. 73

where coscp is the power factor found from the ratio:

cos cp = s

where tj is the efficiency of the machine.

Electrical formulae

Title

Formula

Unit

Definitions / notes

M_D+2M_A+2M_M

Accelerating torque

Moment of acceleration M_A is the difference between the motor torque M_mot(estimated), and the resistive torque M_r. (M_D, M_A, Mm, M_n, see curve below) N = instantaneous speed N_N = rated speed

r_A expresses the efficiency of the driven machine. M is the torque required by the driven machine.

^Ma 6

General formula:

_M 1 A

(M_mot - M_r) dN

Power required by the machine

P in W M in N.m m in rad/s rj_A no unit

M ■ m

Power drawn by the 3-phase motor

P in W

U in V

I in A

t phase angle by which the current lags or leads the voltage. U armature voltage. I line current.

P = 43 ■ U ■ I ■ COSq>

Reactive power absorbed by the motor

Q in VAR

Q = 43 ■ U ■ I ■ sin

Reactive power q = 13 u² C m U in V U = voltage at the capacitor terminals

supplied by a bank I C in \x F C = capacitor capacitance

of capacitors _m i_n _rad/_s m = rotational frequency of supply phases (m = 2itf)

Apparent power g = J3 ^ u ^ | I S in VA

S = Jp² + Q²

Power supplied by _r r\ expresses motor efficiency at the point of operation under consideration.

3-phase motor ^P = ^' ^U' '' ^cos^^r


Slip	N_S - N	Slip is the difference between the actual motor speed N and the synchronous speed N_S
Synchronous speed	N_S = ¹²⁰ -^{f S} P	N_S in min^-1f in Hz	p = number of poles f = frequency of the power supply

SOMŒ

Z-RANGE GEARLESS: SYNCHRONOUS WITH PERMANENT MAGNETS - AC DRIVE FOR ELEVATORS - LEROY SOMER - #9

Linear actuator, Soft starter, Electric cylinder, Brushless alternator, Vertical pump