XM-75 Motor

Model Description

Hydraulic Motor: Typically refers to an energy conversion device that converts hydraulic energy provided by a hydraulic pump into mechanical energy, producing rotational motion.

High-speed Motor: Gear motors offer advantages such as compact size, light weight, simple structure, good processability, low sensitivity to oil contamination, and low shock and inertia. Disadvantages include significant torque pulsation, low efficiency, low starting torque (only 60% to 70% of rated torque), and poor stability at low speeds.

Series Specifications

Terms of Use

1. Working Medium
(1) Above 15 degrees Celsius ambient temperature, N32 and N46 machine tool hydraulic oil, and thickened hydraulic oil 40-2 may be used.
(2) Below 15°C ambient temperature, YH-10 aviation hydraulic oil (above -30°C) or 20-1 thickened hydraulic oil (above -5°C) can be used.
(3) To prevent abnormal wear of the精密 internal parts of the motor, the motor's intake or return oil system is equipped with a precision oil filter with a filtration accuracy exceeding 25 micrometers.
2. Installation
(1) The motor output end is connected to the driven mechanical equipment using a flexible coupling. The coaxial alignment error between the two shafts should not exceed 0.1mm. Chain drives and other transmission methods with impact loads are not permitted.
(2) No transmission method is permitted that subjects the motor shaft to radial forces.
(3) The mounting bracket or base for the motor should have sufficient rigidity to prevent vibration-induced deformation that could affect concentricity.
(4) During the installation of piping and components, strict cleanliness must be maintained. No foreign matter should be mixed into the pipeline. Oil pipes used in the oil circuit must undergo pressure testing (recommended double the working pressure) and be acid cleaned and surface treated. After the pipeline installation is complete, an auxiliary oil pump should be used to circulate oil for flushing until no dirt is present in the filter, then install and use the main oil pump.
(5) Pay attention to the direction of the drive shaft and determine the connection method for the oil inlet and outlet pipe routes.

Troubleshooting 

Upon connection, the motor fails to start but emits a humming sound.

Possible Causes:
(1) The power supply is not fully connected for single-phase start-up.
(2) Motor overload
(3) Mechanism jammed during dragging
(4) Winding motor rotor circuit is open due to a broken wire.
(5) Incorrect initial position of the stator inside, or there may be a broken wire or short circuit.
Treatment Methods: (1) Inspect the power cord, motor leads, fuses, and switch contacts, locate the open circuit, and eliminate it; (2) Start with no load or half load after unloading; (3) Check the driven machinery, eliminate any faults; (4) Inspect the brush, slip rings, and starting resistor contacts; (5) Redetermine the start and end points of the three phases and check for any open circuits or short circuits in the three-phase windings.
The motor has difficulty starting, and its speed is low after reaching the rated load.
Possible Causes:
(1) Lower power voltage;
(2) Originally misconnected as a corner joint, now incorrectly connected as a star joint.
(3) Welding at the cage end of the squirrel-cage rotor has failed, causing it to loosen or break.
Treatment Methods: (1) Increase voltage; (2) Check and correct the labeling wiring method, adjusting the stator winding connections; (3) Inspect and address issues accordingly.
Section 3: The motor overheats beyond the temperature rise standard or emits smoke after starting up.
Possible Causes:
(1) Low power voltage causes excessive temperature rise in the motor under rated load.
(2) Poor ventilation for the motor or excessively high humidity in the environment.
(3) Motor overload or single-phase operation;
(4) Frequent motor startups or excessive number of forward and reverse operations
(5) Stator and rotor rub.
Treatment Methods: (1) Measure no-load and loaded voltage; (2) Inspect the motor fan and clean the ventilation ducts to enhance ventilation and reduce ambient temperature; (3) Check phase currents with a clamp meter and address accordingly; (4) Reduce the frequency of motor forward and reverse operations, or replace it with a motor suitable for frequent startups and reversals; (5) Perform after-inspection troubleshooting.

Working Principle 

The outer shaft (3) is supported by bearings (4) and (6) within the housing (7). The inner shaft (5) connects to the outer shaft via splines at one end and to the cylinder block (9) via splines at the other. During start-up and no-load conditions, the cylinder block maintains a certain oil film contact with the distribution plate (8) under the action of springs (2) and (11). The other end of the cylinder block is supported by bearing (13) on the housing. The cylinder bore contains 7 plungers (10), with the spherical ends of the plungers locked into the ball sockets of the sliding shoe (17). Typically, during operation, the sliding shoe is pressed against the inclined plate (18) by the oil pressure, maintaining a certain oil film contact. However, when the self-priming start is initiated or the speed suddenly increases, the sliding shoe may float. To prevent this, a ball pivot (15) at the end of the inner shaft, acted upon by spring (11), pushes against the return plate, keeping the sliding shoe pressed against the inclined plate surface.

Power Calculation 

N=QP/(60η) (Kw) Actual motor power used

Q – Flow Rate  L/min (Actual Usage Flow Rate)

P – Pressure, MPa (Actual Operating Pressure)

η - Total Efficiency Acceptable range: 0.85

Users can select the motor based on the actual load as calculated using the formula provided above.

Dimensions