Explanation of maxon IDX drives terminology
Dimensional drawings Presentation of the views according to the projection method E (ISO). All dimensions in [mm]. Drive data The values were determined for sinusoidal commuta- tion and a drive without additional attachments, such as a brake or gearhead. Additional attachments may change the performance data of the system. 1 Nominal power supply voltage U N [Volt] is the supply voltage at which the nominal values of the drive are achieved. The nominal values (lines 2 – 7) are based on this voltage. The supply voltage may vary within the range of the nominal operating voltage (line 12). 2 Nominal speed n N [rpm] is the speed for which the drive is rated. For torques up to the nominal torque, the integrated motor con- troller is capable of regulating to this speed. 3 Nominal torque at 25°C (max. continuous torque) [mNm] and 4 Nominal torque at 40°C (max. continuous torque) [mNm] is the torque generated during operation with the nominal supply voltage and nominal supply current at 25°C/40°C. It is at the limit of the drive's continuous operation range. To prevent the winding from heating up too much, higher torques are only possible for brief periods. The integrated motor controller monitors the winding with a temperature sensor. 5 Nominal supply current at 25°C [A] and 6 Nominal supply current at 40°C [A] is the supply current required to reach the nominal torque with the nominal supply voltage at 25°C/40°C. 7 Maximum speed with nominal supply voltage [rpm] is the maximum speed the drive can achieve at the nominal supply voltage. 8 Maximum permissible drive speed n max [rpm] is the maximum speed the drive can achieve. The maximum speed can only be achieved if a sufficiently high supply voltage is available. Higher speeds are not permitted.
Maximum torque (short-term) M max [mNm]
18 Ambient temperature [°C] Operating temperature range. It results from the thermal resistance of the materials and components used, and the viscosity of the bearing lubrication. 19 Axial play [mm] On motors that are not preloaded, these are the tolerance limits for the bearing play. A preload cancels out the axial play up to the specified axial force. When load is applied in the direction of the preload force (away from the flange), the axial play is always zero. The length tolerance of the shaft includes the maxi- mum axial play. 20 Radial play [mm] Radial play is the bearing’s radial movement. A spring is utilized to preload the motor’s bearings, eliminating radial play up to a given axial load. 21/22 Max. axial load [N] Dynamic: axial loading permissible in operation. If dif- ferent values apply for traction and thrust, the smaller value is given. Static: maximum axial force that does not cause per- manent damage when applied to the front of the shaft at standstill. 23 Max. radial load [N] The value is given for a typical distance from the front flange. As the distance increases, this value decreas- es. 24 Weight of motor [g] 25 Typical noise level [dBA] is the statistical average of the noise level measured in accordance with the maxon standard (10 cm dis- tance radially to the drive, no-load operation at the given speed.) The drive lies freely on a plastic foam mat in the noise chamber). The acoustic noise level depends on a number of factors, such as component tolerances, and it is greatly influenced by the overall system in which the drive is installed. When the drive is installed in an unfavorable constellation, the noise level may be significantly higher than the noise level of the drive alone. The acoustic noise level is mea- sured and determined during product qualification. In manufacturing, a structure-borne noise test is per- formed with defined limits. Impermissible deviations can thus be identified.
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is the torque that the drive can output for short periods of time. The duration depends on the installation and is monitored by the integrated motor controller using temperature sensors. 10 Maximum supply current (short term) I max [A] is the maximum current. The supply current is not pro- portional to the torque, but instead depends on the supply voltage and the operating point. 11 Rotor moment of inertia J R [gcm2] is the mass moment of inertia of the rotor, based on the axis of rotation. 12 Nominal supply voltage +V CC [V] shows the permitted range for the supply voltage relative to GND. If the actual voltage is lower than the nominal supply voltage, then the nominal torque and speed cannot be guaranteed. If a brake is attached, then the supply voltage of the brake is considered to be the lower limit (see feature chart). 13 Mechanical time constant t m [ms] is the time required for the rotor to accelerate from standstill to 63% of its no load speed. 14 Thermal resistance housing-ambient R th2 [K/W] and 15 Thermal resistance winding-housing R th1 [K/W] Characteristic values of thermal contact resistance without additional heat sinking. Lines 14 and 15 combined define the maximum heating at a given power loss (load). Thermal resistance R th2 on motors with metal flanges can decrease by up to 80% if the motor is coupled directly to a good heat-conducting (e.g. metallic) mounting rather than a plastic panel. 16 Thermal time constant of winding t w [s] and 17 Thermal time constant of drive t s [s] These are the typical response times for temperature changes of the winding and drive. It is noticeable that the drive has a much slower thermal response than the winding. The values have been calculated from the product of the thermal capacity and the given heat resistances. The integrated motor controller monitors the temperatures with temperature sensors.
358 maxon compact drive
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