AC Motor & Gearmotor Installation

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AC Motors & Gearmotors

Index

Installation Conditions

Gearhead Connection & Mounting

Motor Connection

Motor Operation

How to Use Gearheads

Before Using an AC Motor or Gearmotor

Connecting Gearheads to Motors

As the figure to the right shows, a gearhead is combined with a motor using the pilots on each unit as guides. The gearhead should be moved gently from side to side without forcing the pinion shaft against the plate of the gearhead (metal plate) or against the gear itself.

Note: Attempting to put a motor and gearhead together by force may result in damage to the gearhead.

Mounting Motor/Gearhead to Machinery

The motor flange is provided with a pilot section that serves as a guide not only when assembling the motor and gearhead, but also when installing the motor/gearhead unit onto the machinery.

In this example the motor/gearhead unit is mounted to a dedicated mounting bracket (optional accessory).

When mounting motors that have a built-in cooling fan at the rear, leave a space of 0.4 inch (10 mm) or more behind the fan cover or create ventilation holes so as not to block the cooling intake.

Dedicated Mounting Bracket

Mounting GN Type and 5GU‚KA Type Gearheads

Mounting 5GU‚KHA Type Gearheads

Use the screws provided with the gearhead and secure all the parts so that there are no gaps between the motor flange face and the pilot end face of the gearhead.

Before mounting to machinery, assemble the motor and gearhead using the screws provided with the gearhead. Screws for mounting to machinery are not provided. M8 screws must be provided separately.

Mounting FPW Series, V Series, BH Series and BHF Series Parallel Shaft type Gearheads

Mounting Right-Angle Gearheads

The V Series, BH Series and BHF Series parallel shaft gearmotors come with the motor and its dedicated gearhead pre-assembled. Mount to machinery using the "mounting screws" provided. FPW Series should also be mounted using the stainless steel mounting screws provided.

Attach the provided gasket between the motor flange face and the pilot end face. Do not bend or scratch the gasket. Before mounting the right-angle gearhead to the machinery, assemble the motor and the gearhead using the screws provided.
(BH Series and BHF Series right-angle come pre-assembled with the motor and its dedicated gearhead.) Screws for mounting to machinery are not provided. M6 screws (for GN type) or M8 (for GU type, BH Series and BHF Series right-angle) must be provided separately.

Mounting a Decimal Gearhead to GN Type and 5GU‚KA Type

Dimensions for Mounting Holes

Use the screws provided with the decimal gearhead and secure all the parts so that there are no gaps between the motor flange face and the pilot end face of the decimal gearhead, or between the decimal gearhead and the gearhead's pilot end face.

The dimension of the 4 motor mounting holes are shown as the pitch diameter in the dimensions of each product. The distance between the mounting holes are shown below.

Unit = inch (mm)

Motor Frame Size	A	B	C
‚1.65 (‚42)	1.89 (48)	1.336 (33.94)	1.4803 (37.6)
‚2.36 (‚60)	2.76 (70)	1.949 (49.50)	2.1260 (54)
‚2.76 (‚70)	3.23 (82)	2.283 (57.98)	2.5197 (64)
‚3.15 (‚80)	3.70 (94)	2.617 (66.47)	2.8740 (73)
‚3.54 (‚90)	4.09 (104)	2.895 (73.54)	3.2677 (83)
‚4.09 (‚104)	4.72 (120)	3.341 (84.85)	3.7008 (94)

Mounting Method for Hollow Shaft Type Gearheads
Example of Attaching the Load

Attach the load according to load shaft conditions as shown in the
figure below. The hollow shaft inside dimension is machined to a tolerance of H8, and incorporates a key slot for load shaft attachment. A load shaft tolerance of h7 is recommended. The key provided with the product should be secured to the shaft. Also, apply a lubricant such as molybdenum disulphide grease to the load shaft and the inner circumference of the hollow shaft. The recommended dimensions of the load shaft are shown in the table to the right.

4GN‚RH, 5GN‚RH, 5GU‚RH		BH Series, BHF Series Right-Angle Hollow Shaft Type
Stepped-down shafts Straight load shafts		Stepped-down shafts Straight load shafts

Method of Securing the Load to an Output Shaft

The output shafts of high-power gearheads are provided with a key slot to secure the load, while the shafts of gearheads with comparatively low power have been given a shaft flat. Round shaft motors come in two types, those with and without a shaft flat on the motor output shaft.

Shaft Flat 0GN, 2GN, 3GN, 4GN, 5GN, 4GN‚RAA, 5GN‚RAA gearhead AXH015 and round shaft type motors with a motor frame size of 3.15 inch (80mm) or larger.

Key Slot 5GU, 5GC, 5GCH, 5GU‚RAA, RH Gearheads, 5GU‚KHA, V Series, BH Series,FBL II Series, AXH Series (except 15 W)

On round shaft types, the output shaft is machined to the accuracy of H7 in dimension and 0.0008 inch or less in eccentricity. Therefore, when connecting a load to the shaft if the device, take measurements using a dial gauge or similar instrument so that there is no eccentricity. When the shaft center of two shafts does not fit, use a flexible coupling (MCL coupling) etc. to avoid unnecessary strain on the shaft. The same procedure should be applied when securing a load to gearheads.

Securing the Load to a Shaft Flat
With a shaft flat, use a locking screw to ensure that the lead does not slip. We recommend using double point screws or other screws with strong locking power.

Securing the Load Using a Key Slot
Secure loads using the key provided with the gearhead after machining the key slot on the equipment to be connected (sprocket etc.).

Note:
Ensure that the gearhead shaft is not subjected to shock in the axial direction, since this will have an adverse effect on the bearings. Be especially careful not to use a hammer when inserting the key.