ZM40 Motor

Model Description

Hydraulic Motor: Traditionally 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 craftsmanship, low sensitivity to oil contamination, and low shock and inertia. However, they have drawbacks including significant torque pulsation, lower efficiency, lower 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°C ambient temperature, use N32, N46 machine tool hydraulic oil, and 40-2 thickened hydraulic oil.
(2) For ambient temperatures below 15°C, use YH-10 aviation hydraulic oil (above -30°C) or 20-1 thickened hydraulic oil (above -5°C).
(3) To prevent abnormal wear of the精密 internal parts of the motor, the motor's oil intake or return 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 with a flexible coupling. The coaxiality error between the two shafts should not exceed 0.1mm. Chain drives and other transmission methods with shock loads, such as universal joints, are not permitted.
(2) Radial force-bearing transmission methods for motor shafts are not permitted.
(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 contaminants should be mixed into the piping, and oil pipes used in the oil circuit must undergo pressure tests (recommended at twice the working pressure) and be subjected to acid cleaning and surface treatment. After the piping installation is complete, an auxiliary oil pump should be used to circulate and flush the oil until no contaminants are present in the filter, then install and use the main oil pump.
(5) Note the direction of rotation of the drive shaft to determine the pipeline connection method for the oil inlet and outlet ports.

Fault Handling

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

Possible Causes:
(1) Power supply not fully connected for single-phase start-up.
(2) Motor overload
(3) Mechanism stuck during dragging
(4) Open circuit in the winding motor rotor circuit due to a broken wire.
(5) Incorrect initial position of the stator internal end, or there is a broken wire or short circuit.
Method of Handling: (1) Inspect the power cable, motor lead wires, fuses, and contact points of switches, locate the broken circuit, and eliminate it; (2) Start with no load or half load after unloading; (3) Check the driven machinery, and eliminate any faults; (4) Inspect the contact conditions of the brushes, slip rings, and starting resistors; (5) Re-determine the start and end points of the three phases and check for any open circuits or short circuits in the three-phase windings.
Two: Difficulty starting the motor; after adding the rated load, the speed is low.
Possible Causes:
(1) Low power voltage.
(2) Originally misconnected as a corner joint, now incorrectly connected as a star joint.
(3) Welding at the end of the squirrel cage rotor bars has failed, causing loosening or breakage.
Treatment Methods: (1) Increase voltage; (2) Check the label wiring method and correct the stator winding connection; (3) Inspect and treat accordingly.
Section 3: The motor overheats beyond the temperature rise standard or emits smoke after startup
Possible Cause:
Low power supply voltage causes excessive temperature rise in the motor under rated load.
(2) Poor motor ventilation or excessive humidity in the environment.
(3) Motor overload or single-phase operation;
(4) Frequent motor startups or excessive number of forward/reverse operations
(5) Stator and rotor rubbing.
(Treatment Methods: 1. Measure no-load and load voltages; 2. Inspect the motor fan and clean the ventilation ducts to enhance ventilation and lower ambient temperature; 3. Check phase currents with a clamp meter and address accordingly; 4. Reduce the number of forward and reverse operations of the motor, or replace it with a motor suitable for frequent startups and reversals; 5. Conduct post-inspection and address any remaining issues.)

Operating Principle 

The outer shaft (3) is supported in the bearing (4) and (6), which are mounted in the housing (7). The inner shaft (5) connects to the outer shaft via a spline on one end and to the cylinder block (9) via a spline on the other. The cylinder block maintains a certain oil film contact with the distributor disk (8) under the action of the spring (2) and (11) during start-up and no-load operation. The other end of the cylinder block is supported in the housing by the bearing (13). The cylinder bore contains 7 plungers (10), with the spherical ends of the plungers locking into the ball socket of the slider shoe (17). Normally, during operation, the slider shoe is held in contact with the inclined plate (18) by the oil pressure, but when self-priming starts or the speed suddenly increases, the slider shoe may rise. To prevent this, a ball and socket joint (15) at the inner shaft end, acted upon by the spring (11), supports the return disk to press the slider shoe onto the inclined plate surface.

Power Calculation

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

Q - Flow Rate; L/min (Actual Flow Rate)

P — Pressure; MPa (Actual Operating Pressure)

η - Total Efficiency Range: 0.85

Users can calculate the actual load according to the formula listed above and then select the motor.

Dimensions (外观尺寸)