Technical terms

Standstill torque M₀ [Nm]

Torque, also referred to as starting torque, that the motor can generate at standstill. It can be maintained indefinitely at a speed of n < 100 rpm and nominal ambient conditions.

Nominal torque M_n [Nm]

The torque that the motor delivers when it is operated at nominal speed and nominal current. Can be output in S1 continuous operation for an unlimited period of time.

Voltage constant K_Erms [mVmin]

Indication of the induced motor EMF at 20 °C, based on 1000 rpm. This is specified as the sine effective RMS value between two terminals.

Rotor moment of inertia J [kgcm²]

Measurement of the acceleration capacity of the motor. For example, at J₀ the acceleration time t_b from 0 to 3000 rpm can be calculated based on the following formula:

with M₀ in Nm and J in kgcm²

Thermal time constant t_TH [min]

Specification of the heating time of the cold motor under load with I₀ until an overtemperature of 0.63 x 100 Kelvin is reached. This temperature rise happens in a much shorter time when the motor is loaded with the peak current.

Release delay time / application delay time for the
holding brake t_BRH [ms]/t_BRL [ms]

Specification of the response times of the holding brake [+] when operated at the nominal voltage.