Program 2011/2012 - maxon motor - #201

Explanation of the pages 202-243

Dimensional drawings

On the enclosed DVD dimensional drawings

(DXF-files) are available and are suitable for

import to any CAD system. Presentation of the

views according to the projection method E (ISO).

All dimensions in [mm].

Mounting threads in plastic

Screwed connections on motors with plastic

flanges require special attention.

MA Max. tightening torque [Ncm]

A torque screwdrivermay be adjusted to this value.

L Active thread depth [mm]

The relation of the thread depth to the thread di-

ameter must be at least 2:1. The screw-in depth

must be less than the usable length of the thread!

Gearhead data

Values are based on an ambient temperature of

around 25°C (known as cold data).

Technical data

Recommended input speed

It is based on service life considerations. If this

value is greatly exceeded, the service life can

be shortened, the gear heats up more and more

noise is generated.

Temperature range

The temperature range may be extended for some

gears to -40°C and +100°C, but in extremely low

temperatures, much greater power consumption

must be expected. Special lubrication can be

supplied on request, even for other temperature

ranges.

Radial play

The radial play test value depends heavily on the

mounting, measuring point and adjoining force.

For this reason, the clearance of the measuring

point to the flange is always given. Measurement

is always carried out under a test force that is

smaller than the maximum radial load.

Max. permissible radial load

Is stated in a specific distance from the gear

flange. If it is not specified in stages, radial load is

based on a reference speed of 1,000 rpm on the

gear drive shaft.

Axial play

The value for the axial play of a gear is deter-

mined between the two axial end positions of the

output shaft. This measurement is determined by

the type of bearings and may be zero for pre-load-

ed ball bearings and low axial forces. Minimum

play is required for any kind of friction bearings

otherwise they will jam.

Max. permissible axial load

Corresponds to the permissible axial load of the

drive shaft without damaging the gear. Below the

given load, axial play can be kept.

Max. permissible pressing force

Corresponds to the force with which, for example,

a coupling element may be mounted to the gear

drive shaft.

Line 1 Reduction ratio

The reduction indicates the ratio by which the

speed of the gear output shaft is smaller than the

motor speed.

Line 2 Absolute reduction ratio

Provides the reduction as an exact ratio of two

natural numbers.

Line 3 Max. motor shaft diameter [mm]

The max. motor shaft diameter is based on the

motor pinion's root circle.

Line 4 Number of stages

States the number of gear stages engaged in se-

ries.

Line 5 Max. continuous torque [Nm]

The continuous torque provides the maximum

load permanently applied to the output shaft. If it

is exceeded, the service life is significantly short-

ened.

Line 6 Intermittent torque [Nm]

The intermittent torque is the value that may be

applied to the gears for a short period without

causing damage. It is defined as follows:

-during 1 second

-during max. 10 % of the life expectancy

If these values are exceeded, a reduced service

life must be expected.

Line 7 Efficiency [%]

The specified efficiency is a maximum value that

is valid for maximum continuous torque. The ef-

ficiency is greatly reduced with very small loads

(see diagram). The efficiency is stage-dependent,

but is unaffected by the motor speed.

Line 8 Weight [g]

Line 9 Median gear backlash unloaded ["]

Gear backlash is the turning angle of the gear out-

put shaft which, when the input shaft is blocked,

the gear output shaft covers when it is turned from

one end position to the opposite position. The end

positions depend on the torque applied to the out-

put shaft. It should be noted that if the gear output

shaft is blocked, based on the reversed reduction

ratio, the motor shaft will turn through a much

greater angle from stop to stop.

Line 10 Mass inertia [gem2]

The gear moment of inertia is given at the motor

shaft. It is required in order to calculate the ad-

ditional torque needed for acceleration of the gear

components in the case of highly dynamic drives.

Variations may arise depending on how lubrica-

tion is distributed.

Line 11 Gear length L1 [mm]

L1 describes the gear length down to the motor's

axial mount area (reference C in motors).

Line 12 Direction of rotation

The direction of rotation of our planetary gears is

always the same as that of the motor shaft. With

spur gears, it depends on the number of stages.

With even numbers (i.e. 2, 4, 6, 8), the direction of

rotation is the same, but the opposite if the num-

bers are odd.

Line 13 max. transferable continuous

performance [W]

This value gives the maximum constant output

available on the output shaft. If it is exceeded, the

service life is considerably shortened.

Line 14 max. transferable intermittent

performance [W]

This value gives the maximum intermittent output

available on the output shaft. This range may be

used intermittently and repeatedly. It is defined as

follows:

-during max. 1 second

- during max. 10% of the operating cycle

If these values are exceeded, a reduced service

life must be expected.

I

Gearhead efficiency as a function of torque (schematic)

Gear play measurement

Twisting angle [degrees]

Efficiency

100%

80%

60%

40%

Backlash

no load

-2000 -1500 -1000

-500

-0.2

0 500 1000 1500 2000

Test torque [mNm]

Max. continuous torque at gear output

May 2011 edition/subjectto change

maxon gear 201