Product Details

Series Torque Sensor

User's Manual

Thank you for using WTQ-803 series torque sensor products. Necessary instructions on correct selection, installation and use of this product are made in the User's Manual. Please follow the instructions in strict accordance with this manual.

Application range
WTQ series torque sensor is a fine measuring instrument to measure various torques, rotation speeds and mechanical powers. Its application range is very wide and is mainly used in:
1. Detection of output torque and power of rotating power equipment, such as electric motor, engine, internal-combustion engine, etc.
2. Detection of torque and power of fan, water pump, gear box and torque spanner;
3. Detection of torque and power of railway locomotive, automobile, tractor, aircraft, ship and mining machine;
4. Detection of torque and power in the sewage treatment system;
5. Manufacturing the viscometer;
6. Process industry and flow process industry.
Basic principle:
1. Torque measurement: Adopt the strain gauge measuring technology; form a strain bridge on the elastic axis; supply power to the strain bridge and then measure the twisted electrical signal of the elastic axis. After amplifying the strain signal, turn into the frequency signal proportional to the torsional strain after pressure / frequency conversion. As shown in the figure:
  Application schematic diagram
2. Rotation speed measurement: Method of magnetoelectric encoding disk is adopted to measure the rotation speed. Each magnetoelectric encoding disk has 60 teeth; a rotation of the magnetoelectric encoding disk driven by the axis can generate 60 pulses. Accuracy of speed sensor can reach ±0.1%~±0.5% (F•S). Internal speed measurement is adopted for the speed measurement of this sensor. Users need to specify whether to monitor the speed signal when ordering.

3. Physical dimension

I. Product features:

1. Enter the working state after startup for minutes; do not need the preheating process.

2. High detection accuracy, good stability and strong anti-interference.

3. Continuously measure the positive and negative torques without repeated zero setting.

4. Small in size, light in weight and easy installation.

5. The sensor can be used independently without the secondary instrument, and can directly output the frequency signal or analog quantity proportional to the torque.

II. Main performance and electrical indexes:

Torque accuracy: <±0.5 % F•S, <±0.25 % F• S, <±0.1 % F• S (optional)

Frequency response: 100μs

Nonlinearity: <±0.1 % F• S

Repeatability: <±0.1% F• S

Return difference: <0.1 % F•S

Zero drift: <0.2 % F• S

Zero temperature drift: <0.2 % F•S /10℃

Operating temperature: -20 ~ 50℃

Storage temperature: -40 ~ 70℃

Power supply voltage: ±15VDC, 24VDC (optional)

Signal output: 5KHz - 15KHz, 0-20mA, 4-20mA, 0-5V, 0-10V, 1-5V (optional)

III. Selection of sensor range

Selection of torque sensor range shall be based on the maximum torque measured; generally certain margin shall be reserved to prevent damage to sensor caused by overload.

Calculation formula: M=9550×P/N

M: Torque Unit: N.m

P: Motor power Unit: KW

N: Rotation speed Unit: r/min

If the motor you use is the three-phase induction motor, the recommended torque range should be 2-3 times the rated torque since the starting instantaneous torque of motor is large.

IV. Definition of electrical connection

The torque sensor uses an aviation joint (with shielded cable), the definition of outgoing line of the shielded cables:

1. Power supply: ±15V Output: 5-15KHz

Power source: (red +15V) (black- ground) (blue -15V)

Torque output: (yellow-positive) (black-negative)

2. Power supply: ±15V Output: 5-15KHz Built-in speed sensor

Power source: (red +15V) (black- ground) (blue -15V)

Torque output: (yellow-positive) (black-negative)

Rotation speed output: (white-positive) (black -negative)

3. Power supply: ±15V Output: 4-20mA (Analog quantity)

Power source: (red +15V) (black- ground) (blue -15V)

Output: (yellow-positive) (white-negative)

4. Power supply: ±15V Output: 4-20mA (Analog quantity) Built-in speed sensor

Power source: (red +15V) (black- ground) (blue -15V)

Torque output: (yellow-positive) (green-negative)

Rotation speed output: (white-positive) (grey-negative)

5. Power supply: 24V Output: 5-15KHz

Power source: (red 24V) (black- ground)

Torque output: (yellow-positive) (blue-negative)

6. Power supply: 24V Output: 5-15KHz Built-in speed sensor

Power source: (red 24V) (black- ground)

Torque output: (yellow-positive) (blue-negative)

Rotation speed output: (white-positive) (blue-negative)

7. Power source: (red 24V) (black- ground)

Torque output: (yellow-positive) (blue-negative)

8. Power supply: 24V Output: 4-20mA (Analog quantity) Built-in speed sensor

Power source: (red 24V) (black- ground)

Torque output: (yellow-positive) (green-negative)

Rotation speed output: (white-positive) (grey-negative)

Note:

If there is a frequency converter or servo motor in the field, a 1: 1 isolation transformer needs to be added in front of the sensor power supply; and cable shielded wire of the sensor is connected to the ground. If the sensor is equipped with the supporting instrument, a 1: 1 isolation transformer also needs to be added in front of the instrument.

Installation method

1. Installation method: Horizontal and vertical installation

(1) Horizontal installation: as shown in Figure 11:

Figure 11 Schematic diagram of horizontal installation for torque sensor

(2) Vertical installation: as shown in Figure 12:

Figure 12 Schematic diagram of vertical installation for torque sensor

2. Connection mode:

Connection between torque sensor and power equipment, loading equipment

(1) Pin coupling elastomer connection: as shown in Figure 13: This kind of connection is simple in structure, easy in processing and convenient in maintenance. It can slightly make up for the relative shift of axis caused by installation error and play a minor role in reducing vibration. It is suitable for the high- speed and low-speed running situation with medium load and frequent starting; the working temperature is -10-50℃.

(2) Rigid coupling connection: as shown in Figure 14: This form of connection is simple in structure and low in cost; it has no compensation performance, cannot buffer and reduce vibration, and demands on the installation accuracy of the two axes. It is used in small vibration conditions.

3. Installation requirements:

(1) The torque sensor can be installed horizontally or vertically.

(2) As shown in Figure 11 and Figure 12, power equipment, sensor and loading equipment shall be installed on a solid foundation to avoid too much vibration; otherwise, data instability, reduction in measurement accuracy and even damage to the sensor may occur.

(3) Pin coupling elastomer or rigid coupling connection shall be adopted.

(4) Concentricity of axis of the power equipment, sensor and loading equipment shall be less than Φ0.05mm.

4. Installation interface shape and size reference

As shown in Figure 15: for values of A, B, F and G marked in the figure, see the corresponding specification table in Figure 7

Figure 15 Installation interface size chart

5. Installation steps:

(1) Determine the distance between the prime motor and load according to the axis connection form and the length of the torque sensor; adjust the distance of axis of the prime motor and load relative to the datum plane to make concentricity of their axis less than Φ0.03mm; fix the prime motor and load on the datum plane.

(2) Respectively install the couplings on their own axes.

(3) Adjust the distance between the torque sensor and the datum plane to make the concentricity of its axis and that of the prime motor and load of less than Φ0.03mm; fix the torque sensor on the datum plane.

(4) Fasten the coupling; complete the installation.