JVLMotor 0.1.0

A library for JVL motors communication with different protocols

JVLMotor

Overview

The MotorCom class is designed to manage communication with various motor types (such as MAC and MIS motors) through different communication protocols. It provides a unified interface to interact with the motors, read and write data, and manage motor settings across different communication protocols.

It also provides drivers for EA PSU (based on ea-psu-controller) and for Matrix APS AC PSU.

Initialization and Motor Selection

The class constructor allows selection of various parameters:

• Motor type: Users can choose between "MAC" or "MIS" motors.
• Communication type: It supports different types like serial communication, Ethernet, and more.
• Protocol selection: Supports multiple protocols such as MacTalk, MacTalkUDP, ModBus, ModBusTCP each of which is instantiated accordingly

Read/Write Operations

The class provides multiple methods to interact with motor registers:

• Write/Read operations: The class allows writing to and reading from motor registers, with optional scaling and error handling.
• WriteModule/ReadModule: These methods are designed to handle specific module register operations, further extending communication possibilities.

The class simplifies reading and writing to specific motor registers and module registers by providing helper functions like writeRegister, readRegister, writeModuleRegister, and readModuleRegister where the registers can be read and written using their name (these names are specified in the Motors files).

Requirements

• Python: Make sure you have Python 3.x installed. You can download it from here.

Usage

Simple example to run the motor at a 1000 RPM for 2 seconds.

from JVLMotor.MotorCom import *

mc = MotorCom(port="COM6",motor="MAC")
print(mc.readRegister("p_ist"))
print(mc.readRegister("v_ist"))
mc.setVelocity(1000)
print(mc.readRegister("v_soll",mc.motor.registers["v_soll"][1]))
print(mc.readRegister("a_soll",mc.motor.registers["a_soll"][1]))

mc.setControlMode("velocity")
time.sleep(2)
print(mc.readRegister("p_ist"))
print(mc.readRegister("v_ist"))
mc.setControlMode("passive")

For the name of the registers or the commands, refer to the corresponding user manual here.

Details

• Creating a MotorCom object: To create a MotorCom object, you can initialize it by specifying the motor type, communication type, protocol, and various other configuration parameters.

motor_com = MotorCom(
    motor="MAC",               # Motor type: "MAC" or "MIS"
    com_type="Serial",         # Communication type: "Serial" or "Ethernet"
    protocol="MacTalk",        # Communication protocol: "MacTalk", "ModBus", "EthernetIP", "Profinet", "EtherCAT".
    port=None,                 # Serial port (optional)
    ip=None,                   # IP address (for Ethernet-based communication - Only ModBus TCP, the others are fixed inside a configuration file)
    baudrate=19200,            # Baudrate (for Serial communication)
    motor_address=254,         # Motor address (default: 254)
    netX=50,                   # Network settings (for ModBus communication)
    motor_version="0",         # Motor version 
)

• Main Functions:
  • write(self,reg,data,scaling=1,length=4,no_response=False): Writes to a register by its number
  • read(self,reg,scaling=1,length=4): Reads a register by its number
  • writeModule(self,reg,data,scaling=1,length=4,no_response=False): Write to a module register by its number
  • readModule(self,reg,scaling=1,length=4): Read a module register by its name
  • writeBit(self,reg,bit,data): Writes a specific bit (0 or 1) in the register specified by its number
  • readBit(self,reg,bit): Reads a specific bit in the register specified by its name
  • writeRegister(self,name, value, scaling=1, length=4, no_response=False): Writes to a register by its name.
  • readRegister(self,name, scaling=1, length=4): Reads a register by its name.
  • writeModuleRegister(self,name, value, scaling=1, length=4, no_response=False): Writes to a module register by its name.
  • readModuleRegister(self,name, scaling=1, length=4): Reads a module register by its name.
  • setControlMode(self,mode):: Set the motor control mode according to:

    {
        "passive": 0,
        "velocity": 1,
        "position": 2,
        "gear": 3,
        "analog_trq": 4,
        "analog_vel": 5,
        "analog_vel_gear": 6,
        "manual_current": 7,
        "test_u": 8,
        "test_a": 9,
        "brake": 10,
        "stop": 11,
        "torque": 12,
        "forward": 13,
        "forward_backward": 14,
        "safe": 15,
        "analog_vel_deadband": 16,
        "analog_trq_vel_limited": 17,
        "analog_gear": 18,
        "coil": 19,
        "analog_bi_pos": 20,
        "analog_to_pos": 21,
        "test_ki": 22,
        "test_trq": 23,
        "gear_follow": 24,
        "index_slow": 25,
        "index_fast": 26,
        "highest": 27
    }
    

  • setPosition(self,counts,length=4): Set the target position p_soll in counts.
  • readPosition(self,length=4): Reads the current position p_ist in counts.
  • setVelocity(self,vel_rpm):: Set the target/maximum velocity v_soll in rpm.
  • readVelocity(self): Reads the current velocity v_ist in rpm (according to the scaling - can be modified according to the motor parametrization).
  • setAcceleration(self,acc_rpm_s): Set the maximum acceleration a_soll in rpm/s.
  • clearErrors(self): Clear the error register.
  • command(self,command,no_response=False): Write a command by its name.
  • writeModuleCommand(self,command,no_response=False): Write a command in the module by its name.
  • resetModule(self): Reset the module
  • resetSynchronous(self): Reset the module and the motor synchronously.
  • saveToFlashReset(self): Save to flash and reset.
  • saveToFlashResetModule(self): Save to module's flash and reset.
  • scopeVelocity(self,threshold = 10,size="small"): Set the trigger and arm to scope the velocity when it's above the threshold in rpm.

Each of these methods allows you to interact with the motor, configuring it for data collection, triggering events, or reading and writing motor parameters via different protocols. Every register has a also a scaling value which can be accessed by :

scaling = mc.motor.registers["my_register"][1]

• Scope function The MotorCom also provide the scope function (not available with real-time protocol). To do so here is a simple example where the scope is triggered when the velocity is above 100 RPM:

    mc.setScopeTrigger("compareValue", mc.motor.registers["v_ist"][0],
                        100*(1/mc.motor.registers["v_ist"][1],
                        condition = ">",trig_on_change=True))
    mc.arm([mc.motor.registers["v_soll"][0],mc.motor.registers["v_ist"][0],
            mc.motor.registers["p_ist"][0],mc.motor.registers["a_soll"][0]],
            size="small",rec_inner=False)

    mc.setVelocity(1000)
    mc.setControlMode("velocity")
    time.sleep(2)
    mc.setControlMode("passive")
    
    mc.downloadSBuf()
    mc.rescaleData([mc.motor.registers["v_soll"][1],mc.motor.registers["v_ist"][1],
            mc.motor.registers["p_ist"][1],mc.motor.registers["a_soll"][1]])

    mc.save("my_csv.csv")

• Functions detailled
  • setScopeTrigger(self, mode, L=0, R=0, H=0, condition="",trigger_pos=0, trig_on_change=False, divisor=0): Set the trigger of the scope. Different mode: Never,Always,compareValue,compareRegister,bitcondition,withinThreshold,outsideThreshold. Different conditions: ==,!=,>,>=,<,<=,<<,!<<,||.
  • arm(self,registers,size="normal",rec_inner=False): Arm the scope, with a list of registers (sepcified by their number).
  • downloadSBuf(self): Download the scope buffer and put it into self.channels
  • rescale(self,index,scaling): Rescale a specific channel.
  • rescaleData(self,scalings): Rescale the channels according to the scalings list provided.
  • save(self,file_name): Save the data into a csv file.

PSU Usage

Elektro-Automatik PSU

The EaPsuController is designed to be used with EA PSU with 2 outputs but can also be used for single or more outputs. For more functionnalities please refer to: https://pypi.org/project/ea-psu-controller/

• Initialization:

# If with source code in the directory: 
from JVLMotor.MotorCom import *
# Else 

from JVLMotorLibrary.
psu = EaPsuController(comport="COM3",v_1=24, i_1=1, v_2=12, i_2=0.5,
                        ovp_1=30,ocp_1=2,ovp_2=20,ocp_2=1)
# Only if the PSU has 2 outputs:
psu.setupPsu()                        

• Minimal Example:

psu.setupOutput(0,voltage=30,current=1,ovp=50,ocp=2)

psu.set_ovp(10,1)
psu.set_ocp(1,1)
psu.set_voltage(5,1)
psu.set_current(0.2,1)
psu.output_on(1)

psu.remote_off(0)
psu.remote_off(1)

Matrix APS AC PSU

• Initialization

from JVLMotor.MotorCom import *
psu = APSController(port="COM7",baudrate=19200,timeout=1,device_id=1)
psu.setup(voltage=220,frequency=50,max_current=5)

• Minimal Example

psu.writeAutoTargetVoltage(150)
psu.writeControlOutput(True)
voltage = psu.readAutoTargetVoltage()
print(voltage)

Project Structure

• MotorCom.py: The main class for communication with different motors
• Motors/: Directory containing the different class for the motors.
  • Motor.py: Contains dictionnaries common to both motors.
  • MACMotor.py: Contains dictionnaries specific for MAC.
  • MISMotor.py: Contains dictionnaries specific for Mis.
• Protocols/: Directory containing the different class for the protocols and the communications
  • TemplateProtocol.py: A template that every protocol should inherit from
  • MacTalkProtocol.py: The class for the MacTalk protocol (Serial and UDP)
  • ModBusProtocol.py: The class for the Modbus protocol (Serial and TCP)
  • Communications/: Directory containing the different class for the communications and lower level classes
    • TemplateCommunication.py: A template that every communication should inherit from
    • SerialCommunication: The class for a serial communication
    • Drivers/: Directory containing the different drivers and configuration for the CifX board
      • EaPsuController.py: The class for the EA PSU driver and control
      • APSController.py: The class for the APS PSu driver, communication and control