Oriental motor BLHM Series

Questions and Answers

M
Matthew AustinAug 11, 2025
What to do if my Oriental motor Engine fails to turn on?
- E
  ericdyerAug 11, 2025
  If your Oriental motor Engine isn't turning on, ensure that both the START/STOP and RUN/BRAKE inputs are set to the ON position. Additionally, the internal potentiometer might need adjustment; try turning it slightly clockwise, as the speed is set to 0 r/min at the factory.
L
Levi MelendezAug 19, 2025
Why is my Oriental motor Engine running in the wrong direction?
- C
  Christopher HesterAug 19, 2025
  The Oriental motor Engine might be running in the opposite direction due to a few reasons. First, check the CW/CCW input; the motor runs clockwise (CW) when this input is ON and counter-clockwise (CCW) when it's OFF. Ensure the connection isn't faulty. Also, if you're using specific speed reduction ratios (30:1, 50:1, or 100:1 with a combination type parallel shaft gearhead, or 20:1 and 30:1 with a geared type), the drive direction will be opposite; in this case, reverse the CW/CCW input operation.
R
Richard RobinsonAug 27, 2025
How to fix an Oriental motor Engine that won't stop immediately?
- M
  Mary PottsAug 27, 2025
  If your Oriental motor Engine doesn't stop immediately, try stopping the motor by using the RUN/BRAKE input instead of the START/STOP input. It's also possible that the load inertia is too high; try increasing the frictional load or reducing the load inertia. Finally, check the acceleration/deceleration time potentiometer to ensure the deceleration time isn't set too long.
M
Michelle BanksSep 3, 2025
What to do if Oriental motor Engine does not run?
- T
  terri98Sep 3, 2025
  If your Oriental motor Engine isn't running, ensure that the motor (gearhead) output shaft and the load shaft are properly aligned and connected. Also, check for any noise interference by running only the motor, driver, and external potentiometer. If noise is present, take measures such as separating the motor from the noise source, reconnecting the wiring, using a shielded cable, or installing a ferrite core.

This document describes the Oriental Motor BLHM series brushless motor, covering its functions, installation, and safety precautions. It is intended for qualified personnel in electrical and mechanical engineering.

Function Description

The BLHM series motor is designed for general industrial equipment. It operates with a DC power supply featuring reinforced insulation on its primary and secondary sides. The manual details the motor's functions, installation methods, and other relevant information. For comprehensive details on connections and operations, users are directed to the operating manual included with the driver or the brushless motor and driver package. Specific manuals include the BLHM Motor OPERATING MANUAL (this document) for motor functions and installation, and the BLH Series OPERATING MANUAL for driver functions and connection methods. A separate BLH Series Digital setting type USER MANUAL is available for download or by contacting Oriental Motor sales offices.

Important Technical Specifications

General Specifications:

Operating Ambient Temperature: 0 to +50 °C [+32 to +122 °F] (non-freezing).
Operating Ambient Humidity: 85% or less (non-condensing).
Altitude: Up to 1000 m (3300 ft.) above sea level.
Surrounding Atmosphere: Free of corrosive gas, dust, radioactive materials, magnetic fields, vacuum, or other special environments. Not subject to continuous vibrations or excessive impact.
Vibration Conformance: JIS C 60068-2-6 "Sine-wave vibration test method" (Frequency range: 10 to 55 Hz, Pulsating amplitude: 0.15 mm, Sweep direction: 3 directions (X, Y, Z), Number of sweeps: 20 times).
Storage Ambient Temperature: -25 to +70 °C [-13 to +158 °F] (non-freezing).
Storage Ambient Humidity: 85% or less (non-condensing).
Shipping Altitude: Up to 3000 m (10000 ft.) above sea level.
Shipping Surrounding Atmosphere: Free of corrosive gas, dust, water, oil, radioactive materials, magnetic fields, vacuum, or other special environments.
Degree of Protection: IP65 (excluding the mounting surface of the round shaft type and connectors). Lead wire type: IP40.

UL Standards, CSA Standards:

Recognition: UL 62368-1, CSA C22.2 No.62368-1 (for 15 W, 30 W, 50 W motors).
Recognition: UL 60950-1, CSA C22.2 No.60950-1 (for 100 W motors).
Thermal Class: 105(A).

CE Marking:

Affixed with CE Marking under EN Standard.
Low Voltage Directive: Not subject to the directive as input power supply voltage is 24 VDC. For conformity, the driver power supply input must be connected to a DC power supply with reinforced insulation.
Installation Conditions (EN Standard): Incorporated in equipment, Overvoltage category: I, Pollution degree: II, Protection against electric shock: Class III equipment.
Thermal Class EN Standards: 120 (E).

Motor Temperature Rise Tests: Conducted with the motor mounted on a heat radiation plate (instead of a gearhead) with the following dimensions:

BLHM230: 115×115 mm (4.53×4.53 in.)
BLHM450: 135×135 mm (5.31×5.31 in.)
BLHM5100: 200×200 mm (7.87×7.87 in.)
Thickness: 5 mm (0.20 in.)
Material: Aluminum alloy

RoHS Directive: Products do not contain substances exceeding the restriction values of RoHS Directive (2011/65/EU).

Permissible Radial and Axial Loads: The manual provides detailed tables for permissible radial and axial loads for different motor types (geared, combination type-parallel shaft, round shaft, combination type-hollow shaft flat gearhead) and gear ratios, at specified distances from the output shaft end. Exceeding these limits can lead to fatigue and damage to bearings and output shafts. For round shaft types, axial load should not exceed one-half the motor mass.

Model Names (Examples):

Geared type: BLHM015K-
Combination type-parallel shaft gearhead: BLHM230KC-, BLHM450KC-, BLHM5100KC- (where "KC" is replaced by "K" for lead wire type).
Combination type-hollow shaft flat gearhead: BLHM230KC-FR, BLHM450KC-FR, BLHM5100KC-FR (where "KC" is replaced by "K" for lead wire type).
Round shaft type: BLHM015K-A, BLHM230KC-A, BLHM450KC-A, BLHM5100KC-A (where "KC" is replaced by "K" except for BLHM015 type).

Usage Features

Safety Precautions:

Qualified Personnel: Only qualified electrical and mechanical engineering personnel should work with the product.
Environment: Do not use in explosive, corrosive, or flammable environments, or where splashing water or combustibles are present.
Power: Always turn off power before moving, installing, connecting, or inspecting the product.
Vertical Applications: Not recommended for vertical applications, as motor stoppage due to protective function activation may cause the moving part to drop.
Modification: Do not machine or modify motor/connection cables, or forcibly bend, pull, or pinch cables.
Testing: Avoid touching motor/driver during insulation resistance or dielectric strength tests to prevent electric shock.
Disassembly: Do not disassemble or modify the motor/gearhead. Refer all internal inspections and repairs to the sales office.
Combination: Use only specified motor, gearhead, and driver combinations.
Enclosure: Install motor, gearhead, and driver in an enclosure.
Specifications: Do not use beyond specifications to prevent fire or damage.
Temperature: Motor and gearhead surfaces can become hot during/after operation, causing skin burns.
Ventilation: Ensure nothing obstructs motor ventilation.
Handling: Do not move the product by holding the output shaft or motor cable.
Output Shaft: Do not touch the motor output shaft (end or pinion) with bare hands.
Assembly: Exercise caution during motor/gearhead assembly to avoid pinching fingers or other body parts.
Installation: Securely install motor/gearhead to the mounting plate. Provide a cover over rotating parts. Securely install load on the output shaft.
Grounding: Ground motor and driver to prevent static electricity damage.
Warning Label: If operators can approach the motor during operation, attach a warning label if the surface temperature exceeds 70°C (158°F).

Installation:

Location: Install in a well-ventilated indoor enclosure with easy access for inspection. The mounting surface should be a flat plate with excellent vibration resistance and heat conductivity.
Cable Extension: Maximum extension distance for connection cable (sold separately) is 2 m (6.6 ft.), including the motor cable length.
Gravitational Operation: Avoid gravitational operation (vertical drive) where the motor output shaft is turned from the load side, as it can lead to uncontrolled speed, protective function activation, and load drop.
Grease Measures: Periodically check for grease stains from the gearhead. Install an oil pan if contamination is a concern.
Hollow Output Shaft: Apply molybdenum disulfide grease to the hollow output shaft and inner walls to prevent seizure.
Low Temperature: In low ambient temperatures, load torque may increase due to oil seal or grease viscosity, potentially reducing output torque or triggering overload alarms. Operation will normalize as the unit warms up.
Rotation Direction: Clockwise (CW) when viewed from the motor output shaft side, counter-clockwise (CCW). For geared types, the gearhead output shaft rotation direction may vary with the gear ratio.
Mounting:
- Geared Type/Round Shaft Type: Secure with hexagonal socket head screws (not included) through four mounting holes. Ensure no gap between product and mounting plate. Fit the boss section into a counterbore or pilot-receiving hole.
- Combination Type-Parallel Shaft Gearhead: Secure with included hexagonal socket head screws through four mounting holes. Ensure no gap.
- Combination Type-Hollow Shaft Flat Gearhead: Can be installed using either front or rear side as mounting surface. Secure with included hexagonal socket head screws. Attach included safety cover to the hollow output shaft on the end opposite the load shaft.
Load Installation:
- Centering: Align the center of the motor/gearhead output shaft with the load shaft.
- Damage Prevention: Do not damage the output shaft or bearing during load installation. Avoid excessive force.
- Modification: Do not modify or machine the output shaft.
- Output Shaft Shape:
  - Combination Type-Parallel Shaft Gearhead: Key slot provided. Use included parallel key.
  - Geared Type/Round Shaft Type: Flat section provided. Use a double-point screw to secure the load and prevent spinning.
- Installation Methods:
  - Coupling: Align centerlines of motor/gearhead and load shafts.
  - Belt: Adjust motor/gearhead output shaft parallel to load shaft, with right angles between shafts and the line connecting pulley centers.
  - Gear: Adjust motor/gearhead output shaft parallel to gear shaft, ensuring correct meshing.
  - Output Shaft End Tapped Hole (except GFS2G): Use as an auxiliary means to prevent transfer mechanism disengagement.
- Hollow Shaft Flat Gearhead (Stepped Load Shaft): Secure retaining ring to load shaft by tightening hexagonal socket head screw over spacer, plain washer, and spring washer. Apply grease to prevent seizure.
- Hollow Shaft Flat Gearhead (Non-stepped Load Shaft): Install a spacer on the load shaft side and secure the retaining ring by tightening hexagonal socket head screw over spacer, flat washer, and spring washer.

Maintenance Features

Checking the Product:

Package Contents: Verify that all listed items (motor, operating manual, mounting screw set, safety cover set) are included. Report any missing or damaged items to the sales office.
Model Verification: Confirm the purchased product's model name matches the package label and nameplates. Provide model name, serial number, and manufacturing date when contacting support.

Removing and Assembling the Gearhead:

Removal: Remove hexagonal socket head screws (2 places for geared type, 4 places for combination type) and detach the gearhead from the motor.
Assembly:
1. Keep pilot sections of motor and gearhead parallel. Assemble by slowly rotating clockwise/counterclockwise, ensuring the motor output shaft pinion does not hit the side panel or gears of the gearhead strongly.
2. Check for gaps and tighten with hexagonal socket head screws.
Cautions: Do not forcibly assemble. Prevent metal objects or foreign substances from entering the gearhead. Avoid dust on pilot sections. Assemble carefully to avoid pinching or crushing the O-ring, which can lead to grease leakage.

Grounding:

Connect the grounding wire with a set screw to the grounding point using a shakeproof washer.
For BLHM015 geared type models, remove paint from the mounting surface and install to a grounded metal surface.

Static Electricity Precautions:

Ground motor and driver to prevent malfunction or damage from static electricity.

Inspection and Maintenance:

Periodic Inspections: Conduct periodic inspections after each motor operation. Discontinue use and contact sales office if abnormalities are noted.
Insulation Resistance/Dielectric Strength Test: Do not conduct these tests with the motor and driver connected, as it may cause damage.
Inspection Items:
- Check for loose mounting screws of motor and gearhead.
- Check for unusual noises from motor/gearhead bearings or gear meshing.
- Check for misalignment between motor/gearhead output shaft and load shaft.
- Check for damage or stress on cables or connection parts between cable and driver.

Warranty: