Test Benches for Type Testing of FHP Motors Fractional Horsepower Motors

The Dynaspede FHP Motor test rig is designed to validate the performance parameters of FHP motors, and is suitable to conduct No-load, full load test and overload test on the motor. Its capabilities are:

• A special quick coupling and quick clamping arrangement to ensure easy changing of test motors
• Capability to monitor operating conditions and motor parameters such as motor voltage, current, speed and load torque
• Provision for variable voltage supply to the motor
• Controlled loading of test motors

Test Set-up

Structure:
The mounting structure is a self-supporting, floor-mounted test bed designed for low vibrations to accommodate the motor under test, loading device, coupling between the motor and the loading device and necessary transducers. The test bench, being rigidly supported on four anti-vibration mounts, needs no permanent grouting.

Motor mounting and coupling arrangement:
The motor is flanged to the specially designed fixture. Suitable L clamps are provided to firmly hold the motor in place during the load test. A low inertia and low backlash coupling suitable for operating at speeds of upto 15,000 rpm is used to couple the motor to the loading device. A separate fixture is provided to vertically hold the motor in position during the No-load test.

Loading device:
The loading device used is a high performance electronically controlled air-cooled eddy current dynamometer, rated for continuous duty operation at speeds of upto 15,000 rpm, torque of 20 Ncm and power of upto 80 Watts. Torque is transmitted through a controlled magnetic field generated by a stationery field coil. The braking torque developed will be smooth and infinitely adjustable. The pneumatic circuit integral with the dynamometer unit includes a precision pressure regulator that regulates the desired quantity of air for cooling the dynamometer.

Torque transducer:
Dynaspede strain gauge based load cell, integral to the dynamometer, is used for torque sensing.

Speed Transducer:
Two independent proximity sensors are used to measure the speed of the motor. One sensor monitors the speed during no load test and another sensor integral to the dynamometer monitors the speed during load test.

Control unit:
The control unit is an integral part of the test rig. The control unit incorporates all the necessary controls for the loading device and hardware to conduct the desired tests. The loading system loads the motor to the specified value against variations of operating conditions of supply and temperature. A variac is used to vary the voltage supply to the motor.

Test Conducted On the Rig

• Load test
• Full load test
• Over load test

Parameters that can be monitored:

• Motor Power
• Motor Current
• Motor Voltage
• Motor Speed