Stepping Motor Station
PV-7700 Pro System |
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The PV-7700 Stepping Motor Station Pro is a
single-device system that enables the comprehensive
measurement of seven important stepping motor
characteristics, namely the θ-T characteristic, holding
torque, detent torque, pull-in torque, pull-out torque,
damping characteristic, and angular accuracy. When the
PV-7700 is connected to a PC, simple operations enable
automatic measurement and display of the results in a graph
format. The measurement data can be easily incorporated into
word-processing and spreadsheet software, and is extremely
useful when evaluating motors. The PV-7700 is capable of
high-accuracy measurement with an angular resolution of
1/10000º (this scale is dependent on the encoder resolution)
and enables ±0.5% of the detector’s full scale torque
measurement accuracy.
In addition to that, by setting motor drive output pulse
at 800kHz, the PV-7700 meets specification for the
micro-step stepping motor. |
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Features
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Dynamic torque characteristics |
Pull-in torque, pull-out torque |
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Static torque characteristics |
θ-T,
holding torque, detent torque |
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Angle characteristics |
Damping characteristic, angular accuracy |
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The detector is a magnetic
phase-differential torque detector, which eliminates the
need to perform a calibration operation each time you
use it. All you have to do is align the motor with the
guide rails and then mount it using the L-shaped
mounting fixture. A two-channel detector slot is
provided as standard. If additional channels are
required, the number of channels can be increased to a
maximum of four, without any need to change the wiring.
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Automatic measurement is enabled just
by clicking the start button in your measurement
application. The torque and angle characteristics are
displayed in a graph format. Auto data save and auto
graph printing functions are also provided.
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Torque : ±0.5% of the detector’s full
scale, Angle : ±0.01°
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Graphs can be output using the Clipboard
function, and numeric data output directly to an Excel
worksheet.
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The torque detector can be selected
from a wide line-up of models ranging from 0.01 N•m to
20 N•m. The PV-7700 system can be used with various
motor drivers owing to the versatility of the high pulse
output.
Configuration / Block Diagram Examples of data
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Pull-in
Torque
Up to 50 measurement points can be set, while the output clock
setting can range from 1 pps to 800 kpps. This function measures the
synchronous rotating torque at the frequency set for each of the
points while automatically reducing the braking force. The measured
results are displayed as a curve using spline interpolation between
the data points on the graph. The pull-in torque curve can be
displayed on the same screen as the pull-out torque curve. |
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Pull-out
Torque
This function measures the synchronous pull-out torque at each of
the measurement frequencies while automatically increasing the
braking force. The number of measurement points and the output clock
setting range are the same as those for the pull-in torque. An
acceleration (slow-up) setting for the output clock can also be
made. The measured results are displayed as a curve using spline
interpolation between the data points on the graph. |
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Detent
Torque (Holding Torque without Excitation)
This function measures the angle and torque over one complete
rotation (360°) while the motor is not excited. The PK detector
measures the torque while rotating the shaft at a slow rotation rate
of 1 r/min. The maximum and minimum values of both the peaks and the
valleys are displayed. |
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Damping
Characteristic (Step-response Characteristic)
This function measures transient response characteristics using
an angle detector. The sampling rate can be set anywhere in the
range from 10 µs to 1 ms, and the number of samples up to 16384
(depends on the sampling rate used). Cursor operations can also be
used to display the angle difference and the time difference between
any two points. A PK Series detector can also be connected and used
to apply the desired load. |
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θ-T
Characteristic (Angle vs. Torque Characteristic)
This function measures the angle and torque for the specified
range. Measurement is performed on an excited motor without pulse
input. The PK detector measures the angle vs. torque characteristic
while rotating the shaft at an extremely slow rotation rate of
approximately 0.06 r/min. The display can also be changed so that
the stable point is at the center. |
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Holding
Torque (Maximum Static Torque during Excitation) This
function measures angle and torque over one complete rotation (360°)
while the motor is excited. The PK detector measures the torque
while rotating the shaft at a slow rotation rate of 1 r/min. The
maximum and minimum values of both the peaks and the valleys are
displayed. |
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Angular
Accuracy
This function enables the measurement of stationary angle error,
step angle error, and hysteresis error. Each error value is
automatically calculated and displayed. High-speed measurement at a
feed speed of 1 to 50 pps is enabled. If an RK Series detector is
used, highly accurate measurement (±0.01°) can be performed. |
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Manual
Mode This mode enables continuous operation and
measurement according to the output clock and load specified using
the PK detector key input functions. Any of the input values can be
changed during operation. The sampling rate can be set anywhere in
the range from 4 ms to 1 s, and the number of samples up to 1024. |
Specifications
PK
Series Torque Detectors
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Model name |
Detector capacity |
Moment of inertia |
Brake power |
Detector shaft
diameter |
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PK-102A |
10 mN•m |
10 gcm2 |
13 W |
3 mm |
|
PK-202A |
20 mN•m |
10 gcm2 |
13 W |
3 mm |
|
PK-502A |
50 mN•m |
14 gcm2 |
13 W |
5 mm |
|
PK-103A |
100 mN•m |
27 gcm2 |
25 W |
5 mm |
|
PK-203A |
200 mN•m |
27 gcm2 |
25W |
5 mm |
|
PK-503A |
500 mN•m |
147 gcm2 |
35 W |
8 mm |
|
PK-104A |
1 N•m |
147 gcm2 |
35W |
8 mm |
|
PK-204A |
2 N•m |
546 gcm2 |
50 W |
8 mm |
|
PK-504A |
5 N•m |
1.7 kgcm2 |
60 W |
14 mm |
|
PK-105A |
10 N•m |
6.6 kgcm2 |
120 W |
14 mm |
PK-205A
[Discontinued] |
20 N•m |
6.6 kgcm2 |
120 W |
14 mm |
| Rpm measurement range |
0 to 3000 r/min
0 to 2000 r/min (PK-504A, 105A, 205A) |
| Torque detection
method |
Magnetic phase-differential system |
| Torque measurement
accuracy |
±0.5% of full scale |
| Internal drive speed |
0.06 r/min or 1 r/min, selectable |
| Braking |
Powder brake system |
| Operating temperature
range |
0 to +40°C |
| Power supply |
100 to 240 VAC ±10%, 50/60 Hz |
| Power consumption |
These specifications differ for each
model. |
| Accessories |
Power cable, signal cable |
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Model name |
RK-820 |
RK-830 |
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Detection method |
Optical phase-differential system |
Optical phase-differential system |
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Shaft configuration |
Dual shaft |
Dual shaft |
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Diameer of detector shaft |
5 mm for both ends |
12 mm for the motor side
8 mm for the PK detector side |
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Moment of inertia |
17 gcm2 |
29 gcm2 |
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Allowable torque range* |
50 mN•m or less |
500 mN•m or less |
| * This is the allowable
range when an angle detector is used
between the torque detector and the
motor.
• When the θ-T characteristic, holding
torque, or detent torque is measured,
the friction torque measurement value of
the angle detector is added. |
| Angle detection accuracy |
±0.01° |
| Angular resolution |
5000 P/R; multiplied to 100,000 P/R within
the PV-7700 |
| Operating temperature range |
0 to +40°C |
| Power supply |
Supplied from the PV-7700 |
| Accessories |
L-shaped mounting fixture, signal cable
Note : Couplings are not supplied |
PV-7700
Torque-Angle Meter
| Measurement parameters |
Torque, angle, analog input signals |
| Measurement accuracy |
Torque : ±0.5% of full scale (1-s average value)
Angle : ±0.01° (when an RK Series angle detector is
used)
Analog input : ±0.2% of full scale |
| Sampling time |
4 ms to 1 s (10 µs to 1 ms when Damping measurement is
performed) |
| Measurement functions |
1. Pull-in torque, 2. Pull-out torque, 3. θ (theta)-T
characteristic, 4. Holding torque, 5. Detent
torque, 6. Damping characteristic, 7.
Angular accuracy |
| Torque signal input
section |
Output signal from a phase-differential detector |
| Angle signal input
section |
| Angle |
RK Series detector signal |
| Input impedance |
Approx.10 Ω |
| Input frequency range |
0 to 250 kHz |
| Input signal amplitude range |
Approx. 11 µAp-p |
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| Analog signal input
section |
±10 VDC, 4 channels, 16-bit A/D converter |
| Motor driver
interface |
Output configuration : Open collector (24 VDC, within
32 mA)
Output signal : Rotational direction signal, clock
pulse Excitation on/off command signal Power supply
output for the interface (switched between 5 V and 12 V)
Clock frequency : 1 Hz to 800 kHz |
| PK detector interface |
Two channels (two further channels can be added as an
option.) |
| Computer (for
connecting to the PV-7700) |
Sold separately
OS (operating system): Windows XP Professional
Edition
Interface required : USB (2.0) x 1, CD-ROM drive
Recommended specifications : Pentium 4 CPU or higher; at
least 512 MB memory |
| Operating temperature
range |
0 to +40°C |
| Power supply |
100 to 240 VAC ±10%, 50/60 Hz |
| Power consumption |
70 VA or less (at 100 VAC) |
| Weight |
Approx.10 kg |
| Accessories |
Power cable, USB cable, connector for motor driver
signal output, PV-7700 application software |
| Options
(Sold separately) |
- PV-0771 Torque analog output
- This option is built into the PV-7700. Output
format: Voltage, 0 to ±10 V Response characteristic:
16 ms to 1 s
- Please specify the machined hole dimensions
required for mounting the motor.
- Couplings are used to connect the motor, angle
detector, and torque detector. Please specify the
required hole diameters.
- Belt-transmission angle detector mechanism
- This mechanism is designed to be used with an RK
Series angle detector when the torque capacity
exceeds 500 mN•m. The angle detector itself is not
provided with the mechanism.
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Revised: 2005/10/22 |
